A K type liquid control valve without diaphragm shaft rod sleeve spring

Abstract

The application discloses a K type liquid control valve without diaphragm, shaft and spring. The K type liquid control valve comprises a cover, a body, a piston cylinder inner ring, a piston, a sealing ring groove, a sealing ring, a lower extension end surface of the piston and a body outlet end inner cavity stopper; the sealing ring is arranged in the sealing ring groove, the piston is arranged in the piston cylinder inner ring, the piston and the lower extension end surface of the piston are integrated, and the cover and the body are sealed to be integrated. The application does not need to use a diaphragm, a shaft, a sleeve and a spring, and has simple structure and small water head loss.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of K type liquid control valve of membraneless shaft sleeve spring, especially by different processing structure and the assembly form of sealing ring can form the K type liquid control valve of membraneless shaft sleeve spring that can meet the demand of various liquid flow conditions. BACKGROUND

[0002] The existing liquid control valve needs to use diaphragm, shaft and sleeve, spring; The liquid flow direction can only be controlled in one direction when running; Static liquid flow cannot be set in the case of working condition.

[0003] The existing liquid control valve installs diaphragm to push the intercepting pressure plate connected with shaft to close and open the valve, and it is quite difficult to replace the diaphragm once it is damaged, which requires professional technicians to replace it, especially for large-diameter valves, it is more difficult to replace the diaphragm, and the cost of manufacturing large-diameter liquid control valve diaphragm and processing is quite high.

[0004] The existing liquid control valve needs to install shaft and sleeve to guide and push the intercepting pressure plate connected with shaft to effectively close and open the valve, so it is easy to cause scaling phenomenon in many liquids, which can cause the valve to close or open failure.

[0005] The existing liquid control valve can only control the valve in one direction when running, so there are many limitations in the range of use.

[0006] The existing liquid control valve needs to use spring to reset and increase the stability when closing the valve, the spring force will cause a certain pressure loss of the starting pressure when opening the valve, which requires large starting pressure and large head loss of the valve, so it can only be used in specific working conditions. SUMMARY

[0007] The present application overcomes the technical deficiencies of the current liquid control valve, and forms a new K type liquid control valve of membraneless shaft sleeve spring that can meet the demand of various liquid flow conditions by different structure processing assembly types without using diaphragm, shaft and sleeve, spring. In the case of working condition, the liquid flow direction can pass through the K type liquid control valve of membraneless shaft sleeve spring in one direction or two directions, and the K type liquid control valve of membraneless shaft sleeve spring can be closed in one direction or two directions; In the case of working condition, the K type liquid control valve of membraneless shaft sleeve spring can set static liquid flow.

[0008] In order to achieve the above purpose, the technical solution adopted by the present application is:

[0009] A kind of diaphragm-free shaft rod bushing spring K type liquid control valve, its structural characteristics are as follows: including cover, body, piston cylinder inner ring, piston, sealing ring groove arranged on the outer wall surface of piston, sealing ring, the extended end face below piston, and body outlet end inner cavity stopper;The setting mode of the piston cylinder inner ring adopts one of the following seven forms:

[0010] Corresponding position of piston and cover is arranged,

[0011] Corresponding position of piston and body is arranged,

[0012] Corresponding position of piston and cover, body is arranged simultaneously,

[0013] Corresponding position of piston and seat is arranged, wherein the seat is located between cover and body,

[0014] Corresponding position of piston and cover, seat is arranged simultaneously,

[0015] Corresponding position of piston and seat, body is arranged simultaneously,

[0016] Corresponding position of piston and cover, seat, body is arranged simultaneously,

[0017] The sealing ring is placed in the sealing ring groove, the piston is placed in the piston cylinder inner ring, the piston and the extended end face below the piston are an integral whole, the cover and the body are sealed into an integral whole, or the cover, the seat and the body are sealed into an integral whole.

[0018] The inner ring of the sealing ring is sealed with the sealing ring groove, and the outer ring of the sealing ring is statically sealed and slidingly sealed with the piston cylinder inner ring, so that the inner cavity of the piston and the inner cavity of the body outlet end are sealed.

[0019] The body has a body inlet end inner cavity and a body outlet end inner cavity, and the extended end face below the piston is sealed with the body outlet end inner cavity stopper after the movement of the piston, so that the body inlet end inner cavity and the body outlet end inner cavity are sealed.

[0020] The present application does not need to use the diaphragm, shaft rod, bushing and spring of the existing hydraulic valve, and has simple structure and small water head loss.

[0021] According to the embodiments of the present application, the present application can be further optimized, and the following is the technical scheme formed after optimization:

[0022] In one preferred embodiment, the cross section of the piston cylinder inner ring is circular, the cross section of the piston is circular, and the longitudinal section is U-shaped, the cross section of the sealing ring groove is circular, and the longitudinal section is concave, the center line position of the piston cylinder inner ring is the same as the center line position of the piston, the cross section of the sealing ring is circular, and the longitudinal section is V-shaped, and the cross section of the outlet end inner cavity stopper is circular.

[0023] In one preferred embodiment, the inner diameter of the outlet end cavity stopper is smaller than the outer diameter of the piston, the circle plane of the piston cylinder inner ring is parallel to the circle plane of the body outlet end cavity stopper, and the circle plane of the piston cylinder inner ring is at the same center line position as the piston placed in the piston cylinder inner ring, the center line position of the circle plane of the piston cylinder inner ring is the same as that of the piston, the outer circle of the sealing ring is in contact with the piston cylinder inner ring, the direction of the inner diameter of the piston is towards the inner cavity of the piston or the opposite direction of the inner cavity of the piston, the piston is integrally connected with the extension end surface below the piston in a vertical manner, the inner circle of the sealing ring is in elastic retention and in contact with the sealing ring groove, the outer circle of the sealing ring is in elastic retention and in static contact and sliding contact with the piston cylinder inner ring, the inner circle and the outer circle of the sealing ring are in elastic retention, the sealing ring expands and contracts with the increase and decrease of the liquid pressure when the direction of the expansion opening of the sealing ring is subjected to the liquid pressure, and the sealing ring does not expand and contract with the increase and decrease of the liquid pressure when the opposite direction of the expansion opening of the sealing ring is subjected to the liquid pressure, and the direction of the expansion opening of the sealing ring is towards the inner cavity of the piston or the opposite direction of the inner cavity of the piston.

[0024] In one preferred embodiment, the piston cylinder inner ring is arranged on a T-shaped piston cylinder inner ring seat, the number and type of the sealing rings are the same as those of the processed piston sealing ring grooves, the T-shaped piston cylinder inner ring seat is sealed with the body and integrally connected with the body by fasteners, and the cover and the body are integrally connected by screw fixation.

[0025] In one preferred embodiment, a II-shaped piston cylinder inner ring seat is arranged between the cover and the body, the piston cylinder inner ring is arranged on the piston cylinder inner ring seat, the number and type of the sealing rings are the same as those of the processed piston sealing ring grooves, and the cover, the II-shaped piston cylinder inner ring seat and the body are integrally connected by sealing and fasteners.

[0026] In one preferred embodiment, the piston cylinder inner ring is provided with a cut-off opening above or below, the circle plane of the cut-off opening is parallel to the circle plane of the piston cylinder inner ring, and the center line position of the circle plane of the cut-off opening is the same as that of the piston cylinder inner ring, the upper outward extension part of the sealing ring groove or the lower end surface of the sealing ring groove is in conformity with the cut-off opening after the piston moves downward, and the extension end surface below the piston is in conformity with the outlet end cavity stopper of the body, the upper outward extension part of the sealing ring groove is provided with a first sealing surface, the lower end surface of the sealing ring groove is provided with a second sealing surface, and the cover and the body are integrally connected by sealing and fasteners.

[0027] In one preferred embodiment, the seat is provided with a cut-off port, the circle plane of the cut-off port is parallel to the circle plane of the inner circle of the piston cylinder, and the center line position is the same, the upper outward extension of the sealing ring groove or the lower end surface of the sealing ring groove is sealed with the cut-off port after the piston moves downward, and the lower extension end surface of the piston is sealed with the inner cavity cut-off port of the body outlet end, the upper outward extension of the sealing ring groove has a first sealing surface, the lower end surface of the sealing ring groove has a second sealing surface, the cover, the seat and the body are sealed and connected into a whole by fasteners.

[0028] In one preferred embodiment, a shaft rod extending into the inner cavity of the piston is installed on the cover, and the shaft rod is sealed between the contact position of the cover.

[0029] In one preferred embodiment, the inner cavity of the piston and the inner cavity of the body inlet end, and the inner cavity of the piston and the inner cavity of the body outlet end are connected through a pipeline with a valve or directly connected through a pipeline.

[0030] In one preferred embodiment, an electric actuator is installed on the valve, and the electric actuator executes the opening and closing of the valve.

[0031] In one preferred embodiment, the inner cavity of the piston is connected to a three-way valve through a pipeline, one outlet of the three-way valve is connected to the inner cavity of the body inlet end through a pipeline, or one outlet of the three-way valve is connected to the inner cavity of the body inlet end through a pipeline and a check valve, and the other outlet is connected to the inner cavity of the body outlet end through a pipeline.

[0032] In one preferred embodiment, the inner cavity of the piston is connected to the inner cavity of the body inlet end through a pipeline and an inlet two-way valve, and the inner cavity of the piston is connected to the inner cavity of the body outlet end through a pipeline and an outlet two-way valve; or

[0033] In one preferred embodiment, the inner cavity of the piston is connected to the inner cavity of the body inlet end through a pipeline, an inlet two-way valve and a semi-closed check valve, and the inner cavity of the piston is connected to the inner cavity of the body outlet end through a pipeline, an outlet two-way valve and a semi-closed check valve.

[0034] In one preferred embodiment, the inner cavity of the piston is connected to a three-way I through a two-way valve I, two outlets of the three-way I are each provided with a check valve, one outlet of one check valve is connected to the inner cavity of the body inlet end through a pipeline, and the other outlet of the other check valve is connected to the inner cavity of the body outlet end through a pipeline; the inner cavity of the piston is connected to a three-way II through a two-way valve II, two outlets of the three-way II are each provided with a check valve, one outlet of one check valve is connected to the inner cavity of the body inlet end through a pipeline, and the other outlet of the other check valve is connected to the inner cavity of the body outlet end through a pipeline.

[0035] In one of the preferred embodiments, the inner cavity of the piston is connected to the inner cavity of the inlet end of the inlet end two-way valve through a pipe, and the inner cavity of the piston is connected to the outlet of the three-way valve through a pipe, and the outlet end inner cavity of the body is connected to the pipe in the liquid pool through an outlet end two-way valve.

[0036] In one of the preferred embodiments, the inner cavity of the piston is connected to the inner cavity of the inlet end of the inlet end two-way valve through a pipe, and the inner cavity of the piston is connected to the outlet of the three-way valve through a pipe, and the outlet end inner cavity of the body is connected to the pipe in the liquid pool through an outlet end two-way valve.

[0037] In one of the preferred embodiments, the inner cavity of the piston is connected to the inner cavity of the inlet end of the inlet end two-way valve through a pipe, and the inner cavity of the piston is connected to the outlet of the three-way valve through a pipe, and the outlet end inner cavity of the body is connected to the pipe in the liquid pool through an outlet end two-way valve.

[0038] In one of the preferred embodiments, the inner cavity of the piston is connected to the inner cavity of the inlet end of the inlet end two-way valve through a pipe, and the inner cavity of the piston is connected to the outlet of the three-way valve through a pipe, and the outlet end inner cavity of the body is connected to the pipe in the liquid pool through an outlet end two-way valve.

[0039] The technical solutions of the present application are further described as follows:

[0040] The present application is a kind of K type liquid control valve without diaphragm shaft sleeve spring, including cover, body, piston cylinder inner ring, piston, sealing ring groove, sealing ring, piston lower extension end face, body outlet end inner cavity stop, piston cylinder inner ring is on the top of cover, on the top of body, on the top of cover and body, the sealing ring groove is on the top of piston, the sealing ring is installed in the sealing ring groove, the piston is placed in the piston cylinder inner ring, the piston and the piston lower extension end face are an integral whole, the cover and the body are sealed into an integral whole, the inner cavity of the piston and the body outlet end inner cavity are sealed, so that the inner ring of the sealing ring and the sealing ring groove are sealed, and the outer ring of the sealing ring and the piston cylinder inner ring are sealed and slidingly sealed, the body inlet end inner cavity and the body outlet end inner cavity are sealed, so that the piston lower extension end face is in line with the body outlet end inner cavity stop after the piston moves, the inner cavity of the piston and the body inlet end inner cavity and the body outlet end inner cavity are connected through a pipe, a valve or a pilot valve.

[0041] The piston cylinder inner ring plane is circular, the piston plane is circular and the cross-sectional shape is U-shaped, the sealing ring groove plane is circular and the cross-sectional structure shape is concave, the center line position is the same as that of the piston, the sealing ring plane is circular and the cross-sectional shape is V-shaped, the outlet inner cavity stop plane is circular, the inner diameter of the outlet inner cavity stop is smaller than the outer diameter of the piston, the ring plane of the piston cylinder inner ring is parallel to the ring plane of the body outlet inner cavity stop and the center line position is the same, the center line position of the ring plane of the piston cylinder inner ring is the same as and perpendicular to the center line position of the piston placed in the piston cylinder inner ring, the piston is placed in the piston cylinder inner ring, the outer ring of the sealing ring installed on the sealing ring groove needs to be in contact with the piston cylinder inner ring, the direction of the piston inner diameter port of the piston placed in the piston cylinder inner ring is towards the inner cavity of the piston or the opposite direction of the inner cavity of the piston, the piston is vertically connected and fixed with the extension end surface below the piston to form an integral whole, the extension end surface below the piston has a sealing surface, the inner ring of the sealing ring is in contact with the sealing ring groove, the inner ring of the sealing ring has elasticity to keep in contact with the sealing ring groove, the outer ring of the sealing ring has elasticity to keep in static contact and sliding contact with the piston cylinder inner ring, the inner ring of the sealing ring and the outer ring of the sealing ring have elasticity, once the direction of the expansion port of the sealing ring is subjected to liquid pressure, the sealing ring will expand and contract with the increase and decrease of the liquid pressure, if the opposite direction of the expansion port of the sealing ring is subjected to liquid pressure, the sealing ring will not expand and contract with the increase and decrease of the liquid pressure, the sealing ring is installed in the sealing ring groove of the piston, the direction of the expansion port of the sealing ring is towards the inner cavity of the piston or the opposite direction of the inner cavity of the piston, the cover and the body are sealingly connected and fixed to form an integral whole, the inner cavity of the piston is connected with the body inlet inner cavity and the body outlet inner cavity through a pipeline, a valve, a pilot valve connection. The piston inner cavity is connected with the body inlet inner cavity and the body outlet inner cavity through a pipeline, a valve connection or a pilot valve connection to form a liquid control valve that meets different working conditions.

[0042] The piston cylinder inner ring processing structure, the sealing ring groove processing position structure and the sealing ring assembly structure have the following 14 structure forms, but in the process of valve manufacturing and installation, the forms of the piston cylinder inner ring processing structure, the sealing ring groove processing position structure and the sealing ring assembly structure can be changed as needed, as long as the basic structure principle of the application is followed, the form change range of the piston cylinder inner ring processing structure, the sealing ring groove processing position structure and the sealing ring assembly structure beyond the application is also within the protection scope of the application.

[0043] When the seat is not set, the piston cylinder inner ring is processed on the upper surface of the cover, on the upper surface of the body, on the upper surface of the cover and the body, and the processing form is one of the three, the sealing ring groove is processed on the piston, the number of processed sealing ring grooves is 1 to more than 1, and the number of installed sealing rings is the same as the number of processed piston sealing ring grooves and the type is matched, the sealing connection between the cover and the body is fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0044] When the seat is set, the seat is added between the cover and the body, the piston cylinder inner ring is processed on the upper surface of the seat, on the upper surface of the cover and the seat, on the upper surface of the seat and the body, on the upper surface of the cover, the seat and the body, and the processing form is one of the five, the sealing ring groove is processed on the piston, the number of processed sealing ring grooves is 1 to more than 1, and the number of installed sealing rings is the same as the number of processed piston sealing ring grooves and the type is matched, the sealing connection between the cover, the seat and the body is fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0045] The sealing connection between the cover and the body is fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0046] The sealing connection between the cover and the body is fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0047] The sealing connection between the cover and the body is fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0048] The K-type liquid control valve without a diaphragm shaft sleeve spring, a seat is arranged between the cover and the body, a cutoff port is arranged on the seat, the circle plane of the cutoff port is parallel to the circle plane of the inner circle of the piston cylinder and has the same center line position, the upper outward extension part of the upper direction of the sealing ring groove or the lower end surface of the sealing ring groove is sealed with the cutoff port after the piston moves downward, the lower extension end surface of the piston is sealed with the outlet inner cavity cutoff port of the body outlet, the upper outward extension part of the sealing ring groove has a sealing surface, the lower end surface of the sealing ring groove has a sealing surface, the cover, the seat and the body are fixedly connected into an integral whole by screws, and a sealing strip is used for sealing.

[0049] The K-type liquid control valve without a diaphragm shaft sleeve spring, a shaft rod is arranged on the cover and extends into the inner cavity of the piston, the shaft rod is sealed between the contact part of the shaft rod and the cover, and the shaft rod can be moved up and down by rotating a hand wheel.

[0050] The valve is provided with an electric actuator, and the electric actuator is used to execute the opening and closing of the valve.

[0051] The inner cavity of the piston is connected with the inlet inner cavity of the body and the outlet inner cavity of the body through a pipeline, a valve or a pilot valve, and the connection modes are as follows:

[0052] The inner cavity of the piston is connected with the inlet inner cavity of the body and the outlet inner cavity of the body through a pipeline, a valve or a pilot valve, and the connection modes are as follows:

[0053] In the case of following the basic principles of the application:

[0054] The K-type liquid control valve without a diaphragm shaft sleeve spring, the inner cavity of the piston is connected with a three-way valve through a pipeline, one outlet of the three-way valve is connected with the inlet inner cavity of the body through a pipeline, and the other outlet is connected with the outlet inner cavity of the body through a pipeline.

[0055] The control liquid device is a liquid control valve, the inner cavity of the piston is connected with a three-way valve through a pipeline, one outlet of the three-way valve is connected with the inlet inner cavity of the body through a pipeline and a check valve, and the other outlet is connected with the outlet inner cavity of the body through a pipeline.

[0056] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with the inner cavity of the inlet end two-way valve through a pipeline, and the inner cavity of the piston is connected with the inner cavity of the outlet end two-way valve through a pipeline.

[0057] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with the inner cavity of the inlet end two-way valve through a pipeline, and the inner cavity of the piston is connected with the inner cavity of the outlet end two-way valve through a pipeline.

[0058] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with a three-way through a pipeline, two outlets of the three-way are respectively provided with a check valve, an outlet of one check valve is connected with the inner cavity of the inlet end connecting body through a pipeline, and an outlet of the other check valve is connected with the inner cavity of the outlet end connecting body through a pipeline.

[0059] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with the inner cavity of the inlet end two-way valve through a pipeline, and the inner cavity of the piston is connected with the inner cavity of the outlet end two-way valve through a pipeline.

[0060] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with an outlet of the hand wheel three-way pilot valve through a pipeline, another outlet of the hand wheel three-way pilot valve is connected with the liquid inlet end of the pump through a pipeline, the inlet of the hand wheel three-way pilot valve is connected with the inner cavity of the inlet end connecting body through a pipeline, the hand wheel three-way pilot valve is provided with a hand wheel, and the inner cavity of the piston is connected with the inner cavity of the outlet end connecting body through a pipeline.

[0061] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with an inlet of the two-way pilot valve through a pipeline, the outlet of the two-way pilot valve is connected with the inner cavity of the outlet end connecting body through an outlet end two-way valve and a pipeline, the inner cavity of the piston is connected with the inner cavity of the inlet end connecting body through an inlet end two-way valve and a pipeline, and the two-way pilot valve is provided with a screw rod on the top.

[0062] The diaphragmless shaft sleeve spring K type liquid control valve, the inner cavity of the piston is connected with an inlet of the hand wheel three-way pilot valve through a pipeline, another outlet of the hand wheel three-way pilot valve is connected with the inner cavity of the outlet end connecting body through an outlet end two-way valve and a pipeline, the inner cavity of the piston is connected with the inner cavity of the inlet end connecting body through an inlet end two-way valve and a pipeline, and the two-way pilot valve is provided with a screw rod on the top.

[0063] The K type liquid control valve without diaphragm, shaft and sleeve spring can be assembled on site by single component, and the transportation and installation cost can be greatly reduced.

[0064] The K type liquid control valve without diaphragm, shaft and sleeve spring can reduce the failure rate of the liquid control valve, and increase and expand the use range of the liquid control valve.

[0065] In the manufacturing aspect, the K type liquid control valve without diaphragm, shaft and sleeve spring can be manufactured simply and at low cost, and the equipment grade required in the manufacturing of large liquid control valves can be greatly reduced, so that an ultra-large caliber liquid control valve can be manufactured.

[0066] The K type liquid control valve without diaphragm, shaft and sleeve spring can be assembled on site by single component, and the transportation and installation cost can be greatly reduced.

[0067] The K type liquid control valve without diaphragm, shaft and sleeve spring can be assembled on site by single component, and the transportation and installation cost can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1 is the basic structure diagram of the first K type liquid control valve without diaphragm, shaft and sleeve spring; wherein a) is the front view of the body, b) is the front view of the cover, c) is the front view of the first piston and the groove and the lower extension end surface, d) is the front view of the second piston and the groove and the lower extension end surface, e) is the front view of the sealing ring and the local enlarged view, and f) is the front view of the valve.

[0069] Figure 2Figure 1 is a basic structure schematic diagram of the first kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the first kind of piston and its groove and the lower extension end surface as a whole, d) the front view of the second kind of piston and its groove and the lower extension end surface as a whole, e) the front view of the sealing ring and its local amplification, f) the front view schematic diagram of the valve embodiment.

[0070] Figure 3 Figure 2 is a basic structure schematic diagram of the third kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the first kind of piston and its groove and the lower extension end surface as a whole, d) the front view of the second kind of piston and its groove and the lower extension end surface as a whole, e) the front view of the first sealing ring and its local amplification, f) the front view of the second sealing ring and its local amplification, g) the front view schematic diagram of the valve embodiment and its local amplification.

[0071] Figure 4 Figure 3 is a basic structure schematic diagram of the fourth kind of diaphragmless shaft sleeve spring K type liquid control valve, the front view schematic diagram of the valve embodiment.

[0072] Figure 5 Figure 4 is a basic structure schematic diagram of the fifth kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the first kind of piston and its concave groove local amplification and the lower extension end surface as a whole, d) the front view of the second kind of piston and the lower extension end surface as a whole and its U type piston, e) the front view of the sealing ring and its V type local amplification, f) the front view schematic diagram of the valve embodiment.

[0073] Figure 6 Figure 5 is a basic structure schematic diagram of the sixth kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the first kind of piston and its concave groove local amplification and the lower extension end surface as a whole, d) the front view of the second kind of piston and the lower extension end surface as a whole and its U type piston, e) the front view of the sealing ring and its V type local amplification, f) the front view schematic diagram of the valve embodiment.

[0074] Figure 7 Figure 6 is a basic structure schematic diagram of the seventh kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the first kind of piston and its concave groove local amplification and the lower extension end surface as a whole, d) the front view of the second kind of piston and the lower extension end surface as a whole and its U type piston, e) the front view of the sealing ring and its V type local amplification, the front view schematic diagram of the valve embodiment and its local amplification.

[0075] Figure 8 is the basic structure diagram of the eighth kind of diaphragmless shaft sleeve spring K type liquid control valve; the valve embodiment and the schematic diagram of the partial enlarged cross-sectional view thereof.

[0076] Figure 9 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the ninth kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the cross-sectional view of the body, b) the cross-sectional view of the cover, c) the cross-sectional view of the first kind of piston and the lower extension end surface as a whole and the piston concave groove thereof, d) the cross-sectional view of the second kind of piston and the lower extension end surface as a whole and the piston thereof, e) the cross-sectional view of the first sealing ring and the V type partial enlargement thereof, f) the cross-sectional view of the second sealing ring and the V type partial enlargement thereof, g) the cross-sectional view of the valve embodiment and the partial enlargement thereof.

[0077] Figure 10 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the tenth kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the cross-sectional view of the body, b) the cross-sectional view of the cover, c) the cross-sectional view of the first kind of piston and the lower extension end surface as a whole and the piston concave groove thereof, d) the cross-sectional view of the second kind of piston and the lower extension end surface as a whole and the piston thereof, e) the cross-sectional view of the first sealing ring and the V type partial enlargement thereof, f) the cross-sectional view of the second sealing ring and the V type partial enlargement thereof, g) the cross-sectional view of the valve embodiment and the partial enlargement thereof.

[0078] Figure 11 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the eleventh kind of diaphragmless shaft sleeve spring K type liquid control valve; wherein a) the cross-sectional view of the body, b) the cross-sectional view of the cover, c) the cross-sectional view of the first kind of piston and the lower extension end surface as a whole and the piston concave groove thereof, d) the cross-sectional view of the second kind of piston and the lower extension end surface as a whole and the piston thereof, e) the cross-sectional view of the first sealing ring and the V type partial enlargement thereof, f) the cross-sectional view of the second sealing ring and the V type partial enlargement thereof, g) the cross-sectional view of the valve embodiment and the partial enlargement thereof.

[0079] Figure 12 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the twelfth kind of diaphragmless shaft sleeve spring K type liquid control valve; a) the cross-sectional view of the body, b) the cross-sectional view of the cover, c) the cross-sectional view of the first kind of piston and the lower extension end surface as a whole and the piston concave groove thereof, d) the cross-sectional view of the second kind of piston and the lower extension end surface as a whole and the piston thereof, e) the cross-sectional view of the seat, f) the cross-sectional view of the first sealing ring and the V type partial enlargement thereof, g) the cross-sectional view of the second sealing ring and the V type partial enlargement thereof, h) the cross-sectional view of the valve embodiment and the partial enlargement thereof.

[0080] Figure 13 is the thirteenth kind of sealing ring groove processing structure and sealing ring assembly structure diagram of K type liquid control valve without diaphragm shaft sleeve spring; a) the body of the positive cross-sectional view, b) the positive cross-sectional view of the cover, c) the first kind of piston and the lower extension end surface of the whole and its piston concave groove of the positive cross-sectional view, d) the second kind of piston and the lower extension end surface of the whole and its piston of the positive cross-sectional view, e) the positive cross-sectional view of the seat, f) the first sealing ring and its V type partial enlarged positive cross-sectional view, g) the second sealing ring and its V type partial enlarged positive cross-sectional view, h) the positive cross-sectional view and its partial enlarged view of the valve embodiment.

[0081] Figure 14 is the thirteenth kind of sealing ring groove processing structure and sealing ring assembly structure diagram of K type liquid control valve without diaphragm shaft sleeve spring; a) the body of the positive cross-sectional view, b) the positive cross-sectional view of the cover, c) the first kind of piston and the lower extension end surface of the whole and its piston concave groove of the positive cross-sectional view, d) the second kind of piston and the lower extension end surface of the whole and its piston of the positive cross-sectional view, e) the positive cross-sectional view of the seat, f) the first sealing ring and its V type partial enlarged positive cross-sectional view, g) the second sealing ring and its V type partial enlarged positive cross-sectional view, h) the positive cross-sectional view and its partial enlarged view of the valve embodiment.

[0082] Figure 15 is the thirteenth kind of sealing ring groove processing structure and sealing ring assembly structure diagram of K type liquid control valve without diaphragm shaft sleeve spring; a) the body of the positive cross-sectional view, b) the positive cross-sectional view of the cover, c) the first kind of piston and the lower extension end surface of the whole and its piston concave groove of the positive cross-sectional view, d) the second kind of piston and the lower extension end surface of the whole and its piston of the positive cross-sectional view, e) the positive cross-sectional view of the seat, f) the first sealing ring and its V type partial enlarged positive cross-sectional view, g) the second sealing ring and its V type partial enlarged positive cross-sectional view, h) the positive cross-sectional view and its partial enlarged view of the valve embodiment.

[0083] Figure 16 is the thirteenth kind of sealing ring groove processing structure and sealing ring assembly structure diagram of K type liquid control valve without diaphragm shaft sleeve spring; a) the body of the positive cross-sectional view, b) the positive cross-sectional view of the cover, c) the first kind of piston and the lower extension end surface of the whole and its piston concave groove of the positive cross-sectional view, d) the second kind of piston and the lower extension end surface of the whole and its piston of the positive cross-sectional view, e) the positive cross-sectional view of the seat, f) the first sealing ring and its V type partial enlarged positive cross-sectional view, g) the second sealing ring and its V type partial enlarged positive cross-sectional view, h) the positive cross-sectional view and its partial enlarged view of the valve embodiment.

[0084] Figure 17Figure 17 is a schematic view of the groove machining structure and the seal assembly structure of the seventeenth K-type liquid control valve without diaphragm, shaft, and sleeve spring; a) the body's front view, b) the cover's front view, c) the first piston and the lower extension end surface's front view and its piston concave groove, d) the second piston and the lower extension end surface's front view and its piston, e) the seat's front view, f) the first seal and its V-type partial enlarged front view, g) the second seal and its V-type partial enlarged front view, h) the valve's front view and its partial enlarged view.

[0085] Figure 18 Figure 18 is a schematic view of the groove machining structure and the seal assembly structure of the eighteenth K-type liquid control valve without diaphragm, shaft, and sleeve spring; a) the body's front view, b) the cover's front view, c) the first piston and the lower extension end surface's front view and its piston concave groove, d) the second piston and the lower extension end surface's front view and its piston, e) the seat's front view, f) the first seal and its V-type partial enlarged front view, g) the second seal and its V-type partial enlarged front view, h) the valve's front view and its partial enlarged view.

[0086] Figure 19 Figure 19 is a schematic view of the basic structure of the K-type liquid control valve without diaphragm, shaft, and sleeve spring with double stop valve structure; a) the body's front view, b) the cover's front view, c) the first piston and the lower extension end surface's front view and its concave groove partial enlarged view, d) the second piston and the lower extension end surface's front view and its piston, e) the first seal and its V-type partial enlarged front view, f) the second seal and its V-type partial enlarged front view, g) the valve's front view and its partial enlarged view.

[0087] Figure 20 Figure 20 is a schematic view of the basic structure of the K-type liquid control valve without diaphragm, shaft, and sleeve spring with double stop valve structure; a) the body's front view, b) the cover's front view, c) the first piston and the lower extension end surface's front view and its concave groove partial enlarged view, d) the second piston and the lower extension end surface's front view and its piston, e) the first seal and its V-type partial enlarged front view, f) the second seal and its V-type partial enlarged front view, g) the valve's front view and its partial enlarged view.

[0088] Figure 21is another K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is double-stop valve structure; a) the body's front view, b) the cover's front view, c) the first piston's front view and the extension of the bottom surface, and its concave groove, d) the second piston's front view and the extension of the bottom surface, and its piston, e) the seat's front view, f) the first seal ring's front view and its V-shaped partial enlargement, g) the second seal ring's front view and its V-shaped partial enlargement, h) the valve's front view and its partial enlargement.

[0089] Figure 22 is another K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is double-stop valve structure; a) the body's front view, b) the cover's front view, c) the first piston's front view and the extension of the bottom surface, and its concave groove, d) the second piston's front view and the extension of the bottom surface, and its piston, e) the seat's front view, f) the first seal ring's front view and its V-shaped partial enlargement, g) the second seal ring's front view and its V-shaped partial enlargement, h) the valve's front view and its partial enlargement.

[0090] Figure 23 is a K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is a flow-limiting valve structure.

[0091] Figure 24 is another K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is a flow-limiting valve structure.

[0092] Figure 25 is a K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is an electric valve structure.

[0093] Figure 26 is another K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is an electric valve structure.

[0094] Figure 27 is a K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is a one-way single intercept valve.

[0095] Figure 28 is a K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is a one-way double intercept valve.

[0096] Figure 29 is a K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is a check valve and intercept valve.

[0097] Figure 30 is a K-type liquid control valve without diaphragm, shaft, and sleeve spring, and its basic structure is a two-way single intercept valve.

[0098] Figure 31 Figure 1 is a schematic diagram of a K-type liquid control valve with no diaphragm, shaft, sleeve and spring.

[0099] Figure 32 Figure 2 is a schematic diagram of a valve float ball valve of the K-type liquid control valve with no diaphragm, shaft, sleeve and spring.

[0100] Figure 33 Figure 3 is a schematic diagram of a flow limiting valve and check valve of the K-type liquid control valve with no diaphragm, shaft, sleeve and spring.

[0101] Figure 34 Figure 4 is a schematic diagram of a pressure reducing and stabilizing valve of the K-type liquid control valve with no diaphragm, shaft, sleeve and spring.

[0102] Figure 35 Figure 5 is a schematic diagram of a pressure relief valve of the K-type liquid control valve with no diaphragm, shaft, sleeve and spring.

[0103] In the drawings:

[0104] 1, cover; 2, seat; 3, body; 4, piston cylinder inner ring; 5, piston sealing ring groove; 6, sealing ring; 7, lower extension end surface of piston; 8, body outlet end inner cavity stop; 9, inner cavity of piston; 10, inner cavity of body; 11, inner ring of sealing ring; 12, outer ring of sealing ring; 13, inner cavity of body inlet end; 14, concave; 15, V-shaped; 16, sealing surface; 17, sealing ring expansion port; 18, pipeline; 19, first valve; 20, U-shaped; 21, screw; 22, sealing strip; 23, first piston cylinder inner ring seat; 24, screw; 25, second piston cylinder inner ring seat; 26, cutoff; 27, upward outward extension; 28, lower end surface; 29, first sealing surface; 30, second sealing surface; 31, shaft; 32, hand wheel; 33, three-way valve; 34, check valve; 35, inlet end two-way valve; 36, outlet end two-way valve; 37, half-closed check valve; 38, two-way valve I; 39, three-way I; 40, two-way valve II; 41, three-way II; 42, float ball valve; 43, outlet end inner cavity flange; 44, pipeline; 45, liquid pool; 46, hand wheel three-way pilot valve; 47, pump; 48, hand wheel; 49, liquid inlet end; 50, two-way pilot valve; 51, screw; 52, three-way pilot valve; 53, two-way valve III; 54, electric actuator; 55, piston; 56, inner diameter port of piston; 57, second valve. DETAILED DESCRIPTION

[0105] Example 1

[0106] The application is a kind of K type liquid control valve without diaphragm shaft sleeve spring, including cover 1, body 3, piston cylinder inner ring 4, piston 55, sealing ring groove 5, sealing ring 6, piston lower extension end face 7, body outlet end inner cavity stop 8, characterized in that: the piston cylinder inner ring 4 is on the top of cover 1, on the top of body 3, on the top of cover 1 and body 3, the sealing ring groove 5 is on the top of piston 55, the sealing ring 6 is installed in the sealing ring groove 5, the piston 55 is placed in the piston cylinder inner ring 4, the piston 55 and the piston lower extension end face 7 are a whole, the cover 1 and the body 3 are sealed into a whole, the inner ring 11 of the sealing ring and the sealing ring groove 5 are sealed, and the outer ring 12 of the sealing ring and the piston cylinder inner ring 4 are sealed and slidingly sealed, so that the inner cavity 9 of the piston and the body outlet end inner cavity 10 are sealed, the piston lower extension end face 7 is sealed with the body outlet end inner cavity stop 8 after the movement of the piston 55, so that the body inlet end inner cavity 13 and the body outlet end inner cavity 10 are sealed, and the inner cavity 9 of the piston, the body inlet end inner cavity 13 and the body outlet end inner cavity 10 are connected through pipes or valves or pilot valves, as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4

[0107] Example 2

[0108] The control valve without diaphragm shaft sleeve spring K type liquid, as Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 ​As shown, the plane of the piston cylinder inner ring 4 is circular, the plane of the piston 55 is circular, the cross-sectional shape is U-shaped 20, the plane of the sealing ring groove 5 is circular, the cross-sectional structure shape is concave 14, the center line position is the same as the center line position of the piston 55, the plane of the sealing ring 5 is circular, the cross-sectional shape is V-shaped 15, the plane of the out-end inner cavity stop 8 is circular, the inner diameter of the out-end inner cavity stop 8 is smaller than the outer diameter of the piston 55, the ring plane of the piston cylinder inner ring 4 is parallel to the ring plane of the body out-end inner cavity stop 8, the center line position is the same, the center line position of the ring plane of the piston cylinder inner ring 4 is the same as and perpendicular to the center line position of the piston 55 placed in the piston cylinder inner ring 4, the piston 55 is placed in the piston cylinder inner ring 4, the outer ring 12 of the sealing ring of the sealing ring 6 installed on the sealing ring groove 5 needs to contact the piston cylinder inner ring 4, the direction of the piston inner diameter port 56 of the piston 55 placed in the piston cylinder inner ring 4 is towards the inner cavity 9 of the piston or the opposite direction of the inner cavity 9 of the piston, the piston 55 is vertically connected and fixed as a whole with the lower extension end surface 7 of the piston, the lower extension end surface 7 of the piston has a sealing surface 16, the inner ring 11 of the sealing ring has elasticity to keep in contact with the sealing ring groove 5 for sealing, the outer ring 12 of the sealing ring has elasticity to keep in static contact and sliding contact with the piston cylinder inner ring 4 for sealing, the inner ring 11 of the sealing ring and the outer ring 12 of the sealing ring have elasticity to keep, once the direction of the sealing ring expansion port 17 is pressed by liquid, the sealing ring 6 will expand and contract with the increase and decrease of liquid pressure, if the opposite direction of the sealing ring expansion port 17 is pressed by liquid pressure, the sealing ring 6 will not expand and contract with the increase and decrease of liquid pressure, the sealing ring 6 is installed in the piston sealing ring groove 5, the direction of the sealing ring expansion port 17 is towards the inner cavity 9 of the piston or the opposite direction of the inner cavity 9 of the piston, the cover 1 and the body 3 are sealingly connected and fixed as a whole, the inner cavity 9 of the piston is connected via a pipeline, a valve or a pilot valve between the body in-end inner cavity 12 and the body out-end inner cavity 10.

[0109] Specific description: The structure of the diaphragm-free shaft rod sleeve spring K-type liquid control valve can make the diaphragm-free shaft rod sleeve spring K-type liquid control valve not need to install a diaphragm, a shaft rod, a sleeve and a spring; liquid can pass through the diaphragm-free shaft rod sleeve spring K-type liquid control valve in two directions; and the diaphragm-free shaft rod sleeve spring K-type liquid control valve can close liquid passage in two directions.

[0110] Working principle: as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 ,Figure 8 as shown

[0111] 1. The inner cavity 9 of the piston, the body inlet cavity 13, the body outlet cavity 10 are connected via the pipe 18, the first valve 19, the second valve 57, when the liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the first valve 19 on the side of the body inlet cavity 13 is closed, the second valve 57 on the side of the body outlet cavity 10 is opened, the liquid in the body inlet cavity 13 cannot enter into the inner cavity 9 of the piston, the lower extension end surface 7 of the piston is pushed by the liquid in the body inlet cavity 13 to leave the body outlet cavity stop 8, the liquid in the body inlet cavity 13 enters into the body outlet cavity 10 through the body outlet cavity stop 8, because the inner cavity 9 of the piston and the body outlet cavity 10 are connected, the liquid pressure in the inner cavity 9 of the piston and the body outlet cavity 10 is the same, the liquid in the body inlet cavity 13 can enter into the body outlet cavity 10 through the body outlet cavity stop 8 only depends on the weight of the whole body of the piston 55 and the lower extension end surface 7 vertically fixed connection and the resistance brought by the friction of the elastic outer ring 12 of the sealing ring 6 keeping in contact with the piston cylinder inner ring 4 sealing and sliding contact sealing, because the elastic outer ring 12 of the sealing ring 6 has very small elasticity to keep in contact with the piston cylinder inner ring 4 sealing when not under the pressure of the liquid, the resistance brought by the friction is also small, as long as the liquid in the body inlet cavity 13 can overcome the pressure loss of the weight of the whole body of the piston 55 and the lower extension end surface 7 vertically fixed connection and the resistance brought by the friction of the elastic outer ring 12 of the sealing ring 6 keeping in contact with the piston cylinder inner ring 4 sealing and sliding contact sealing, the liquid in the body inlet cavity 13 can flow to the body outlet cavity 10, so the pressure loss of the liquid flowing into the body outlet cavity 10 through the body outlet cavity stop 8 is very small, which makes the starting pressure of the membraneless shaft sleeve spring K type liquid control valve very small, and makes the working condition range of the membraneless shaft sleeve spring K type liquid control valve large.

[0112] 2. The inner cavity 9 of the piston, the body inlet cavity 13, the body outlet cavity 10 are connected through the pipe 18, the first valve 19, the second valve 57. When the liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the first valve 19 on the side of the body inlet cavity 13 is opened, and the second valve 57 on the side of the body outlet cavity 10 is closed. The liquid in the body inlet cavity 13 enters the inner cavity 9 of the piston. Because the inner cavity 9 of the piston is not connected with the body outlet cavity 10, the pressure of the liquid in the inner cavity 9 of the piston is the same as that in the body inlet cavity 13. Because the pressure of the liquid entering the body outlet cavity 10 is the pressure of the liquid in the body inlet cavity 13, it can only enter the body outlet cavity 10 by overcoming the resistance caused by the friction between the outer ring 12 of the sealing ring and the sliding contact sealing of the inner ring 4 of the piston cylinder. Therefore, there is a very small pressure difference between the liquid pressure in the body inlet cavity 13 and the liquid pressure in the body outlet cavity 10. Because the outer ring 12 of the sealing ring has a small elasticity to keep the contact sealing with the inner ring 4 of the piston cylinder, the friction of the sliding contact sealing is small. The outer ring 12 and the inner ring 11 of the sealing ring have elasticity to keep the contact sealing. Therefore, the liquid will not leak into the body outlet cavity 10. Because the area of the outer ring of the piston 55 is larger than the area of the inner ring of the body outlet cavity stop 7, the piston 55 will move downward after being pressed. The distance between the lower extension end surface 7 of the piston and the body outlet cavity stop 7 will gradually approach when the piston 55 moves downward. The liquid pressure difference between the body inlet cavity 13 and the body outlet cavity 10 will gradually increase. The direction of the sealing ring inflation port 17 will be affected by the liquid pressure on the sealing ring 6, which will expand with the increase of the liquid pressure. At this time, the sealing ring 6 tends to be in an expanded state in the sealing ring groove 5. After the sealing ring 6 expands, a ring-shaped force will be formed between the sealing ring groove 5 and the inner ring 4 of the piston cylinder, which will make the flat surface of the piston 55 and the inner ring 4 of the piston cylinder tend to be perpendicular, and the lower extension end surface 7 of the piston and the body outlet cavity stop 8 will be kept in a parallel position. The piston 55 continues to move downward. Because of the expansion of the sealing ring 6, the friction resistance between the outer ring 12 of the sealing ring and the sliding contact sealing of the inner ring 4 of the piston cylinder will become larger and larger, which will ensure that the piston 55 will not shake when the distance between the lower extension end surface 7 of the piston and the body outlet cavity stop 8 approaches after the piston 55 moves downward. The valve will achieve a parallel and non-shaking sealing between the lower extension end surface 7 of the piston and the body outlet cavity stop 8. Therefore, the membrane-free shaft sleeve spring K-type liquid control valve does not use a spring to reset and increase the stability when the valve is closed, and a membrane-free shaft sleeve is used to ensure that the lower extension end surface 7 and the body outlet cavity stop 8 are parallel and sealingly matched.

[0113] 3. The inner cavity 9 of the piston, the body inlet cavity 13, the body outlet cavity 10 are connected through the pipe 18, the first valve 19, the second valve 57, when the liquid flows from the body outlet cavity 10 to the body inlet cavity 13, the first valve 19 on the side of the body inlet cavity 13 is opened, the second valve 57 on the side of the body outlet cavity 10 is closed, the liquid in the body outlet cavity 10 cannot enter the inner cavity 9 of the piston, but the liquid in the inner cavity 9 of the piston can flow into the body inlet cavity 13 through the pipe 18 and the first valve 19 on the side of the body inlet cavity 13, at this time, the liquid pressure in the inner cavity 9 of the piston is the same as the liquid pressure in the body inlet cavity 13, as the outer ring area of the piston 55 is larger than the inner ring area of the body outlet cavity stop 8, as long as the liquid pressure in the body outlet cavity 10 is greater than the liquid pressure in the body inlet cavity 13, it can overcome the resistance between the overall weight of the piston 55 and the sealing ring outer ring 12 which has elasticity and keeps sliding contact sealing with the piston cylinder inner ring 4, the piston 55 will be pushed to move upward by the liquid in the body outlet cavity 10, the lower extension end surface 7 of the piston leaves the body outlet cavity stop 8 when the piston 55 moves upward, the liquid in the body outlet cavity 10 flows to the body inlet cavity 13 through the body outlet cavity stop 8, and the valve is opened; during the opening of the valve, the pressure difference between the liquid pressure in the body outlet cavity 10 and the liquid pressure in the body inlet cavity 13 will become closer and closer, the sealing ring expansion port 17 will stretch and contract as the liquid pressure on the sealing ring 6 decreases, when the piston 55 moves to the size of the resistance between the overall weight of the piston 55 and the sealing ring outer ring 12 which has elasticity and keeps sliding contact sealing with the piston cylinder inner ring 4, the piston 55 no longer moves upward, therefore, as long as the pressure of the liquid in the two flow directions is the same, the opening size of the valve depends on the size of the resistance between the overall weight of the piston 55 and the sealing ring outer ring 12 which has elasticity and keeps sliding contact sealing with the piston cylinder inner ring 4, therefore, the valve can realize the flow from the body outlet cavity 10 to the body inlet cavity 13, and the pressure loss of the liquid flowing from the body outlet cavity 10 to the body inlet cavity 13 is also small, so that the diaphragmless shaft sleeve spring K type liquid control valve realizes bidirectional flow under the condition of small pressure loss.

[0114] 4. The inner cavity 9 of the piston, the body inlet cavity 13, the body outlet cavity 10 are connected through the pipe 18, the first valve 19, the second valve 57. When the liquid flows from the body outlet cavity 10 to the body inlet cavity 13, the first valve 19 on the side of the body inlet cavity 13 is closed, and the second valve 57 on the side of the body outlet cavity 10 is opened. The liquid in the body outlet cavity 10 enters the inner cavity 9 of the piston, and the liquid in the inner cavity 9 of the piston cannot flow into the body inlet cavity 13 through the pipe 18 and the first valve 19 on the side of the body inlet cavity 13. At this time, the pressure of the liquid in the inner cavity 9 of the piston is the same as the pressure of the liquid in the body outlet cavity 10. As long as the overall weight of the vertically fixed connection between the piston 55 and the lower extension end surface 7 of the piston can overcome the resistance caused by the elastic outer ring 12 of the sealing ring 6 to keep the sliding contact sealing between the piston cylinder inner ring 4, the piston 55 can move downward. The elastic outer ring 12 of the sealing ring 6 has very small elasticity to keep the contact sealing with the piston cylinder inner ring 4 when it is not pressed by the liquid, so the resistance caused by friction is also small. The piston 55 will move downward under the action of its own weight. The lower extension end surface 7 of the piston aligns with the body outlet cavity stop 8 after the piston 55 moves downward, sealing and cutting off the liquid flow from the body outlet cavity 10 to the body inlet cavity 13. The valve is closed, realizing the bidirectional closing of the membrane-free shaft sleeve spring K type liquid control valve.

[0115] Example 3

[0116] The piston cylinder inner ring 4 is processed on the upper surface of the cover 1, on the upper surface of the body 3, on the upper surface of the cover 1 and the body 3, or on the upper surface of the cover 1 and the body 3. The sealing ring groove 5 is processed on the piston 55, and the number of the processed sealing ring groove 5 is one or more than one. The number of the installed sealing ring 6 is the same as the number of the processed piston sealing ring groove 5, and the type is matched. The cover 1 and the body 3 are fixedly connected into a whole by the screw 21, and the sealing is sealed by the sealing strip 22, as shown in Figure 9 、 Figure 10 、 Figure 11 .

[0117] Example 4

[0118] The seat 2 is added between the cover 1 and the body 3. The piston cylinder inner ring 4 is processed on the upper surface of the seat 2, on the upper surface of the cover 1 and the seat 2, on the upper surface of the seat 2 and the body 3, on the upper surface of the cover 1, the seat 2 and the body 3, or on the upper surface of the cover 1 and the body 3. The sealing ring groove 5 is processed on the piston 55, and the number of the processed sealing ring groove 5 is one or more than one. The number of the installed sealing ring 6 is the same as the number of the processed piston sealing ring groove 5, and the type is matched. The cover 1, the seat 2 and the body 3 are fixedly connected into a whole by the screw 21, and the sealing is sealed by the sealing strip 22, as shown in Figure 12 、 Figure 13 、 Figure 14 .Figure 15 、 Figure 16 as shown.

[0119] Example 5

[0120] The valve has a piston 5, a sealing ring groove 5, a sealing ring 6, a T-shaped piston inner ring seat 2, a body 3, a cover 1, a sealing strip 22, a screw 21, and a screw 24. The sealing ring groove 5 is machined on the piston 5. The number of the sealing ring groove 5 is 2. The sealing ring 6 is installed on the sealing ring groove 5. The T-shaped piston inner ring seat 2 is fixedly connected to the body 3 by the screw 24. The cover 1 and the body 3 are fixedly connected by the screw 21. The sealing strip 22 is used for sealing. The sealing ring groove 5 is machined on the piston 5. The number of the sealing ring groove 5 is 2, as shown in FIG. 2. Figure 17

[0121] Example 6

[0122] The valve has a piston 5, a sealing ring groove 5, a sealing ring 6, a T-shaped piston inner ring seat 2, a body 3, a cover 1, a sealing strip 22, a screw 21, and a screw 24. The sealing ring groove 5 is machined on the piston 5. The number of the sealing ring groove 5 is 2. The sealing ring 6 is installed on the sealing ring groove 5. The T-shaped piston inner ring seat 2 is fixedly connected to the body 3 by the screw 24. The cover 1 and the body 3 are fixedly connected by the screw 21. The sealing strip 22 is used for sealing. The sealing ring groove 5 is machined on the piston 5. The number of the sealing ring groove 5 is 2, as shown in FIG. 2. Figure 18

[0123] Example 7

[0124] The valve has a piston 5, a sealing ring groove 5, a sealing ring 6, a T-shaped piston inner ring seat 2, a body 3, a cover 1, a sealing strip 22, a screw 21, and a screw 24. The sealing ring groove 5 is machined on the piston 5. The number of the sealing ring groove 5 is 2. The sealing ring 6 is installed on the sealing ring groove 5. The T-shaped piston inner ring seat 2 is fixedly connected to the body 3 by the screw 24. The cover 1 and the body 3 are fixedly connected by the screw 21. The sealing strip 22 is used for sealing. The sealing ring groove 5 is machined on the piston 5. The number of the sealing ring groove 5 is 2, as shown in FIG. 2. Figure 19 Figure 20 ​​​​

[0125] Embodiment 8

[0126] The K type liquid control valve without diaphragm shaft sleeve spring, the seat 2 is added between the cover 1 and the body 3, there is a cut-off port 26 on the seat 2, the circle plane of the cut-off port 26 is parallel to the circle plane of the piston cylinder inner circle 4, and the center line position is the same, the upper outward extension part 27 of the piston sealing ring groove 5 or the lower end surface 28 of the sealing ring groove 5 is sealed with the cut-off port 26 after the piston 55 moves downward, and the lower extension end surface 7 is sealed with the body outlet end inner cavity cut-off port 8, the upper outward extension part 27 of the sealing ring groove 5 has a first sealing surface 29, the lower end surface 28 of the sealing ring groove 5 has a second sealing surface 30, the sealing connection between the cover 1, the seat 2 and the body 3 is fixedly connected into an integral whole by the screw 21, and the sealing is sealed by the sealing strip 22. The sealing ring groove 5 is processed on the piston 55 in this embodiment, the number of processing is 1, as shown in Figure 21 , as shown in Figure 22 .

[0127] Embodiment 9

[0128] The K type liquid control valve without diaphragm shaft sleeve spring, a shaft 31 is installed on the cover 1 and extends into the inner cavity 9 of the piston, the contact part between the shaft 31 and the cover 1 is sealed, and the shaft 31 can be moved up and down through the rotating hand wheel 32. As shown in Figure 23 , as shown in Figure 24 .

[0129] Further specific description of embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7, embodiment 8 and embodiment 9:

[0130] Specific description 1:

[0131] The K type liquid control valve of the membraneless shaft rod sleeve spring needs to install the sealing ring 6 according to the direction requirement of the liquid flow. When the working condition only needs the liquid to flow from the body inlet end inner cavity 13 to the body outlet end inner cavity 10, the sealing ring expansion port 17 is installed in the direction of the inner cavity 9 of the piston. When the working condition only needs the liquid to flow from the body outlet end inner cavity 10 to the body inlet end inner cavity 13, the sealing ring expansion port 17 is installed in the direction opposite to the inner cavity 9 of the piston. When the working condition needs the liquid to flow in two directions, the sealing ring 6 needs to have the sealing ring expansion port 17 in two directions in the direction of the inner cavity 9 of the piston. When the working condition only needs the K type liquid control valve of the membraneless shaft rod sleeve spring to be opened and closed in one direction, the number of the sealing ring 6 is one or more. When the working condition needs to be opened and closed in two directions, the number of the sealing ring 6 is two or more. Through the processing structure of the different piston sealing ring groove 5 and the assembly form of the sealing ring 6, the needs of the K type liquid control valve of the membraneless shaft rod sleeve spring in various working conditions can be met.

[0132] Specific description 2:

[0133] When the piston 55 and the lower extension end surface 7 of the piston are vertically connected and fixed as a whole, the direction of the piston inner diameter port 56 of the piston 55 can be connected and fixed in the direction of the inner cavity 9 of the piston or in the direction opposite to the inner cavity 9 of the piston, which can meet the needs of the K type liquid control valve of the membraneless shaft rod sleeve spring in the working condition.

[0134] Specific description 3:

[0135] The K type liquid control valve of the membraneless shaft rod sleeve spring has Figure 17 、 Figure 18 The structure form can make the oil seal seat and the piston of the valve be replaced as a set. When the piston and the oil seal seat are damaged, other parts of the K type liquid control valve of the membraneless shaft rod sleeve spring do not need to be replaced. Due to the unique manufacturing and assembly method, the maintenance is very convenient, and professional technical personnel are not needed for replacement. Therefore, the service life of the K type liquid control valve of the membraneless shaft rod sleeve spring can be basically the same as that of the pipeline.

[0136] Specific description 3:

[0137] The K type liquid control valve of the membraneless shaft rod sleeve spring has Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 The structure form can make the sealing of the valve achieve a better sealing effect.

[0138] Working principle:

[0139] 1. As Figure 19 、 Figure 21The K-type liquid control valve shown is a double stop valve without a diaphragm, shaft, bushing, and spring. Liquid flows from the inlet end cavity 13 to the outlet end cavity 10. The upper end face of the piston extends outward, and the portion 27 extends downward, and then the piston 55 moves downward, sealing with the stop port 26. At the same time, the lower end face 7 of the piston seals with the stop port 8 of the outlet end cavity, cutting off the flow of liquid from the inlet end cavity 13 to the outlet end cavity 10, thus closing the valve. A stop port 26 is machined above the sealing ring groove 5. When the upper end face of the piston extends outward, and then the piston 55 moves downward, it seals with the stop port 26, sealing the liquid in the piston's inner cavity 9 at this position. Because it is a stop port seal, the stop port seal wears very little and will seal better with increased use. Therefore, no leaking liquid will penetrate into the outlet end cavity 10, thus achieving a completely leak-free seal for the valve.

[0140] 2. For example Figure 20 , Figure 22 The diaphragmless shaft sleeve spring K-type liquid control valve shown is a double stop valve. Liquid flows from the inlet end cavity 13 to the outlet end cavity 10. After the piston 55 moves downward, the lower end face 28 of the piston matches and seals with the stop port 26. At the same time, the lower extended end face 7 of the piston matches and seals with the stop port 8 of the outlet end cavity, cutting off the flow of liquid from the inlet end cavity 13 to the outlet end cavity 10, and the valve closes. A stop port 26 is machined below the sealing ring groove 5. After the lower end face 28 of the piston matches and seals with the stop port 28 after the piston 55 moves downward, the liquid in the piston's inner cavity 9 is sealed at this position. Because it is a stop port seal, the stop port seal wear is minimal and will seal better with the increase of use time. Therefore, no leaking liquid will penetrate into the outlet end cavity 10, thus achieving a completely leak-free seal of the valve.

[0141] Specific Explanation 4:

[0142] If you want to adjust the flow statically, there are... Figure 23 , Figure 24 The structural form.

[0143] Working principle:

[0144] like Figure 23 , Figure 24 The diaphragmless shaft sleeve spring K-type liquid control valve flow restrictor shown has two installation forms for piston 55: the piston inner diameter port 56 of piston 55 placed in sealing ring 6 faces the inner cavity 9 of piston or the opposite direction of the inner cavity 9 of piston; shaft 31 can be moved up and down by rotating handwheel 32 to move shaft 31 to a set position. After piston 55 rises, it will be blocked by shaft 31 and cannot rise further. Therefore, the lower extension end face 7 of piston and the inner cavity stop 8 of body outlet end can be kept at a set fixed opening, limiting the flow rate through the lower extension end face 7 of piston and the inner cavity stop 8 of body outlet end, thus achieving static flow restriction.

[0145] Embodiment 10

[0146] The diaphragmless shaft sleeve spring K type liquid control valve is provided with an electric actuator 43, and the valve is opened and closed by the electric actuator 43, as shown in Figure 25 、 Figure 26 .

[0147] Specific description:

[0148] The electric actuator 43 is used to open and close the valve, and the electric actuator 43 is used to replace the manual to open and close the valve, so that the remote control of the diaphragmless shaft sleeve spring K type liquid control valve can be realized: once the power is cut off, the actuator 43 can be removed, and the valve can be opened and closed by using ordinary tools.

[0149] Embodiment 11

[0150] The diaphragmless shaft sleeve spring K type liquid control valve one-way single cut-off valve is provided with a three-way valve 33 connected to the inner cavity 9 of the piston through a pipeline 18, one outlet of the three-way valve 33 is connected to the inner cavity 13 of the valve body through a pipeline 18, and the other outlet is connected to the inner cavity 10 of the valve body through a pipeline 18, as shown in Figure 27 .

[0151] Specific description: in this embodiment, any optional basic structure, sealing ring groove processing structure and sealing ring assembly structure in the application can be used to assemble the pipeline and the valve under the condition of following the basic principle of the application, as shown in Figure 27 .

[0152] Working principle:

[0153] 1. When liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the switch position of the three-way ball valve 33 is set to close the piston's inner cavity 9 and the body inlet cavity 13, and open the piston's inner cavity 9 and the body outlet cavity 10. The liquid in the body inlet cavity 13 cannot enter the piston's inner cavity 9 through the pipe 18 and the three-way ball valve 33, while the liquid in the piston's inner cavity 9 can enter the body outlet cavity 9 through the three-way ball valve 33 and the pipe 18. At this time, the piston 55 is not under pressure, and the lower extension end surface 7 of the piston moves away from the body outlet cavity stop 8 under the push of the liquid in the body inlet cavity 13. The liquid in the body inlet cavity 13 enters the body outlet cavity 10 through the body outlet cavity stop 8, and the valve is open. The switch position of the three-way ball valve 33 is set to open the piston's inner cavity 9 and the body inlet cavity 13, and close the piston's inner cavity 9 and the body outlet cavity 10. The liquid in the body inlet cavity 13 enters the piston's inner cavity 9 through the pipe 18 and the three-way ball valve 33, while the liquid in the piston's inner cavity 9 cannot enter the body outlet cavity 10 through the three-way ball valve 33 and the pipe 18. Because the outer circle area of the piston 55 is larger than the inner circle area of the body outlet cavity stop 8, the piston 55 moves downward under pressure, and the lower extension end surface 7 of the piston aligns and seals with the body outlet cavity stop 8 after the piston 55 moves downward. The liquid in the body inlet cavity 13 is cut off from flowing to the body outlet cavity 10, and the valve is closed.

[0154] 2. When liquid flows from the body outlet cavity 10 to the body inlet cavity 13, the switch position of the three-way ball valve 33 is set to close the piston's inner cavity 9 and the body inlet cavity 13, and open the piston's inner cavity 9 and the body outlet cavity 10. The liquid in the body outlet cavity 10 enters the piston's inner cavity 9 through the pipe 18 and the three-way ball valve 33, while the liquid in the piston's inner cavity 9 cannot enter the body inlet cavity 13 through the three-way ball valve 33 and the pipe 18. When the liquid pressure in the piston's inner cavity 9 is equal to the liquid pressure in the body outlet cavity 10, the piston 55 moves downward under the action of its own weight. The lower extension end surface 7 of the piston aligns and seals with the body outlet cavity stop 8 after the piston 55 moves downward, cutting off the liquid in the body outlet cavity 10 from flowing to the body inlet cavity 13, and the valve is closed. The switch position of the three-way ball valve 33 is set to open the piston's inner cavity 9 and the body inlet cavity 13, and close the piston's inner cavity 9 and the body outlet cavity 10. The liquid in the body outlet cavity 10 cannot enter the piston's inner cavity 9 through the pipe 18 and the three-way ball valve 33, while the liquid in the piston's inner cavity 9 enters the body inlet cavity 13 through the three-way ball valve 33 and the pipe 18. Because the outer circle area of the piston 55 is larger than the inner circle area of the body outlet cavity stop 8, the piston 55 moves upward under the push of the liquid in the body outlet cavity 10. The lower extension end surface 7 of the piston moves away from the body outlet cavity stop 8 when the piston 55 moves upward. The liquid in the body outlet cavity 10 flows to the body inlet cavity 13 through the body outlet cavity stop 8, and the valve is open.

[0155] 3. Detailed description: When liquid flows from the body inlet cavity 13 to the body outlet cavity 10, or when liquid flows from the body outlet cavity 10 to the body inlet cavity 13, the liquid flow direction can only be in one direction after the three-way ball valve 33 is operated, and the other direction is blocked, thus only having the function of one-way flow and one-way blockage.

[0156] Example 12

[0157] The one-way double blockage valve of the K-type liquid control valve without a diaphragm shaft sleeve spring, the inner cavity 9 of the piston is connected to the three-way valve 33 through the pipeline 18, one outlet of the three-way valve 33 is connected to the body inlet cavity 13 through the pipeline 18 and the check valve 34, and the other outlet is connected to the body outlet cavity 10 through the pipeline 18, as shown in Figure 28 .

[0158] Detailed description: This embodiment can use any optional basic structure in the present application, as well as the processing structure of the sealing ring groove and the assembly structure of the sealing ring, and the pipeline and valve are assembled in the case of following the basic principles of the present application, as shown in Figure 28 .

[0159] 1. When liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the three-way ball valve 33 is opened and closed to the inner cavity 9 of the piston and the body inlet cavity 13, and the inner cavity 9 of the piston and the body outlet cavity 10 are opened. The liquid in the body inlet cavity 13 cannot enter the inner cavity 9 of the piston through the pipeline 18, the check valve 34, and the three-way ball valve 33, while the liquid in the inner cavity 9 of the piston can enter the body outlet cavity 10 through the three-way ball valve 33 and the pipeline 18. At this time, the piston 55 will not be pressed, and the lower extension end surface 7 of the piston will move away from the valve body outlet cavity stop 8 under the push of the liquid in the body inlet cavity 13. The liquid in the body inlet cavity 13 enters the body outlet cavity 10 through the outlet cavity stop 8, and the valve is opened. The three-way ball valve 33 is opened and closed to the inner cavity 9 of the piston and the body inlet cavity 13, and the inner cavity 9 of the piston and the valve body outlet cavity 10 are closed. The liquid in the body inlet cavity 13 enters the inner cavity 9 of the piston through the pipeline 18, the check valve 34, and the three-way ball valve 33, while the liquid in the inner cavity 9 of the piston cannot enter the body outlet cavity 10 through the three-way ball valve 33 and the pipeline 18. Because the outer ring area of the piston 55 is larger than the inner ring area of the body outlet cavity stop 8, the piston 55 is pressed to move downward, and the lower extension end surface 7 of the piston aligns and seals with the body outlet cavity stop 8 after the piston 55 moves downward, cutting off the liquid flowing from the body inlet cavity 13 to the body outlet cavity 10. The valve is closed.

[0160] 2. When liquid flows from the body-out end inner cavity 10 to the body-in end inner cavity 13, the three-way ball valve 33 is set to the position of closing the inner cavity 9 of the piston to the body-in end inner cavity 13 and opening the inner cavity 9 of the piston to the body-out end inner cavity 10. The liquid in the body-out end inner cavity 10 flows into the inner cavity 9 of the piston through the pipe 18 and the three-way ball valve 33, while the liquid in the inner cavity 9 of the piston cannot flow into the body-in end inner cavity 13 through the three-way ball valve 33, the check valve 34 and the pipe 18. When the pressure of the liquid in the inner cavity 9 of the piston is equal to the pressure of the liquid in the body-out end inner cavity 10, the piston 55 moves downward under the action of gravity. The lower extension end surface 7 of the piston 55 is sealed with the body-out end inner cavity stop 8 after the piston 55 moves downward, thus cutting off the flow of the liquid from the body-out end inner cavity 10 to the body-in end inner cavity 13, and the valve is closed. The three-way ball valve 33 is set to the position of opening the inner cavity 9 of the piston to the body-in end inner cavity 13 and closing the inner cavity 9 of the piston to the body-out end inner cavity 10. The liquid in the body-out end inner cavity 10 cannot flow into the inner cavity 9 of the piston through the pipe 18 and the three-way ball valve 33, while the liquid in the inner cavity 9 of the piston cannot flow into the body-in end inner cavity 13 through the three-way ball valve 33, the check valve 34 and the pipe 18. Therefore, the piston 55 cannot move under pressure, the valve cannot be opened, and the purpose of one-way flow and two-way cut-off is achieved.

[0161] Example 13

[0162] The diaphragm-free shaft rod sleeve spring K-type liquid control valve check valve and cut-off valve, the inner cavity 9 of the piston is connected to the body-in end inner cavity 13 through the pipe 18 and the in-end two-way valve 35, and the inner cavity 9 of the piston is connected to the body-out end inner cavity 10 through the pipe 18 and the out-end two-way valve 36, as shown in Figure 29 .

[0163] Specific description: In this example, any optional basic structure, sealing ring groove processing structure and sealing ring assembly structure in the present application can be used to assemble pipes and valves in the case of following the basic principles of the present application, as shown in Figure 29 .

[0164] 1. When liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the inlet two-way valve 35 is closed and the outlet two-way valve 36 is opened. The liquid in the body inlet cavity 13 cannot flow into the inner cavity 9 of the piston, but the liquid in the inner cavity 9 of the piston can flow into the body outlet cavity 10 through the pipe 18 and the outlet two-way valve 36. At this time, the piston 55 is not under pressure, and the lower extension end surface 7 of the piston moves away from the body outlet cavity stop 8 under the push of the liquid in the body inlet cavity 13. The liquid in the body inlet cavity 13 enters the body outlet cavity 10 through the body outlet cavity stop 8, and the valve is opened. When liquid flows from the body outlet cavity 10 to the body inlet cavity 13, the pressure of the liquid in the inner cavity 9 of the piston depends on the amount of liquid in the body outlet cavity 10 that enters the inner cavity 9 of the piston. When the pressure of the liquid in the inner cavity 9 of the piston is equal to the pressure of the liquid in the body outlet cavity 10, the piston 55 moves downward under the action of its own weight. After the piston 55 moves downward, the lower extension end surface 7 of the piston aligns with the body outlet cavity stop 8 to seal and cut off the flow of liquid from the body outlet cavity 10 to the body inlet cavity 13, the valve is closed, and the check valve function is achieved.

[0165] 2. When liquid flows from the body outlet cavity 10 to the body inlet cavity 13, the outlet two-way valve 36 is closed and the inlet two-way valve 35 is opened. The liquid in the body outlet cavity 10 cannot flow into the inner cavity 9 of the piston, but the liquid in the inner cavity 9 of the piston can flow into the body inlet cavity 13 through the pipe 18 and the inlet two-way valve 35. Because the outer circle area of the piston 55 is larger than the inner circle area of the body outlet cavity stop 8, the piston 55 is pushed upward by the liquid in the body outlet cavity 10. When the piston 55 moves upward, the lower extension end surface 7 of the piston moves away from the body outlet cavity stop 8. The liquid in the body outlet cavity 10 flows into the body inlet cavity 13 through the body outlet cavity stop 8, and the valve is opened. When liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the pressure of the liquid in the inner cavity 9 of the piston depends on the amount of liquid in the body inlet cavity 13 that enters the inner cavity 9 of the piston. When the pressure of the liquid in the inner cavity 9 of the piston is equal to the pressure of the liquid in the body inlet cavity 13, because the outer circle area of the piston 55 is larger than the inner circle area of the body outlet cavity stop 8, the piston 55 moves downward under the action of the liquid pressure. After the piston 55 moves downward, the lower extension end surface 7 of the piston aligns with the body outlet cavity stop 8 to seal and cut off the flow of liquid from the body inlet cavity 13 to the body outlet cavity 8, the valve is closed, and the check valve function is achieved.

[0166] 3. Specifically, when liquid flows from the body inlet cavity 13 to the body outlet cavity 10, or when liquid flows from the body outlet cavity 10 to the body inlet cavity 13, one of the inlet two-way valve 35 and the outlet two-way valve 36 is opened and the other is closed. There is a closed liquid flow direction, so there is a check and cut-off function.

[0167] Example 14

[0168] The piston's inner cavity 9 is connected to the body's inner cavity 13 through the pipeline 18, the inlet two-way valve 35, and the half-closed check valve 37, and the piston's inner cavity 9 is connected to the body's inner cavity 10 through the pipeline 18, the outlet two-way valve 36, and the half-closed check valve 37, as shown in the figure. Figure 30

[0169] Specific description: In this embodiment, any one of the basic structures, the processing structure of the sealing ring groove, and the sealing ring assembly structure in the present application can be used to assemble the pipeline and the valve under the condition of following the basic principles of the present application, as shown in the figure. Figure 30

[0170] 1. When the liquid flows from the body's inner cavity 13 to the body's inner cavity 10, the inlet two-way valve 35 and the outlet two-way valve 36 are opened, at this time, the half-closed check valve 37 installed on the pipeline 18 of the body's inner cavity 13 is half closed, and the half-closed check valve 37 installed on the pipeline 18 of the body's inner cavity 10 is fully open, the liquid in the body's inner cavity 13 enters the piston's inner cavity 9 through the pipeline 18, the half-closed check valve 37, the inlet two-way valve 35, and the pipeline 18, because the half-closed check valve 37 installed on the pipeline 18 of the body's inner cavity 10 is fully open, the amount of liquid entering the piston's inner cavity 9 is less than the amount of liquid flowing to the body's inner cavity 10, therefore, the piston 55 is not pressed, and the lower extension end surface 7 of the piston moves away from the body's inner cavity stop 8 under the push of the liquid in the body's inner cavity 13, the liquid in the body's inner cavity 13 enters the body's inner cavity 10 through the body's inner cavity stop 8, and the valve is opened; the inlet two-way valve 35 is opened, and the outlet two-way valve 36 is closed, at this time, the half-closed check valve 37 installed on the pipeline 18 of the valve body's inner cavity 13 is half closed, not fully closed, which can make the liquid in the body's inner cavity 13 enter the piston's inner cavity 9 through the half-closed check valve 37, the inlet two-way valve 35, and the pipeline 18, because the outlet two-way valve 36 is closed, the liquid in the body's inner cavity 13 cannot flow to the body's inner cavity 10, the outer ring area of the piston 55 is larger than the inner ring area of the body's inner cavity stop 8, the piston 55 is pressed to move downward, and the lower extension end surface 7 of the piston is sealed and cut off the liquid flowing from the body's inner cavity 13 to the body's inner cavity 10 after the piston 55 moves downward, and the valve is closed.

[0171] ​​2. When liquid flows from the body outlet inner cavity 10 to the body inlet inner cavity 13, the inlet two-way valve 35 and the outlet two-way valve 36 are opened, at this time the semi-closed check valve 37 installed on the pipe 18 of the body outlet inner cavity 10 is half closed, the semi-closed check valve 37 installed on the pipe 18 of the body inlet inner cavity 13 is fully opened, the liquid in the body outlet inner cavity 10 flows into the inner cavity 9 of the piston through the pipe 18, the semi-closed check valve 37, the outlet two-way valve 36 and the pipe 18, because the semi-closed check valve 37 installed on the pipe 18 of the body inlet inner cavity 13 is fully opened, the amount of liquid flowing into the inner cavity 9 of the piston is less than the amount of liquid flowing into the body inlet inner cavity 13, because the outer ring area of the piston 55 is larger than the inner ring area of the body outlet inner cavity stop 8, the piston 55 is pushed by the liquid in the body outlet inner cavity 10 to move upward, the lower extension end surface 7 of the piston leaves the body outlet inner cavity stop 8 when the piston 55 moves upward, the liquid in the body outlet inner cavity 10 flows into the body inlet inner cavity 13 through the body outlet inner cavity stop 8, the valve is opened; the inlet two-way valve 35 is closed and the outlet two-way valve 36 is opened, at this time the semi-closed check valve 37 installed on the pipe 18 of the valve body outlet inner cavity 10 is half closed, not fully closed, which can make the liquid in the valve body outlet inner cavity 10 flow into the inner cavity 9 of the piston through the pipe 18, the semi-closed check valve 37, the outlet two-way valve 36 and the pipe 18, because the inlet two-way valve 35 is closed, the liquid in the body outlet inner cavity 10 cannot flow from the inner cavity 9 of the piston to the body inlet inner cavity 13, when the liquid pressure in the inner cavity 9 of the piston is the same as the liquid pressure in the body outlet inner cavity 10, the piston 55 will move downward under the action of its own weight, the lower extension end surface 7 of the piston abuts and seals with the body outlet inner cavity stop 8 after the piston 55 moves downward, cutting off the flow of liquid in the body outlet inner cavity 10 to the valve body inlet inner cavity 13, the valve is closed.

[0172] 3. Specifically, when liquid flows from the body inlet inner cavity 13 to the body outlet inner cavity 10 or liquid flows from the body outlet inner cavity 10 to the body inlet inner cavity 13, the inlet two-way valve 35 and the outlet two-way valve 36 are opened, liquid can flow through the valve in both directions, closing one of the two-way valves can close the liquid flow in one direction through the valve, therefore the valve has the functions of liquid flowing through the valve in both directions and one-way cut-off.

[0173] Example 15

[0174] The piston's inner cavity 9 is connected with a three-way I39 through a two-way valve I38, two outlets of the three-way I39 are both installed with a check valve 34, an outlet of one check valve 34 is connected with the body inlet inner cavity 13 through a pipeline 18, and an outlet of the other check valve 34 is connected with the body outlet inner cavity 10 through a pipeline 18, the piston's inner cavity 9 is connected with a three-way II 41 through a two-way valve II 40, two outlets of the three-way II 41 are both installed with a check valve 34, an outlet of one check valve 34 is connected with the body inlet inner cavity 13 through a pipeline 18, and an outlet of the other check valve 34 is connected with the body outlet inner cavity 10 through a pipeline 18, as shown in Figure 31

[0175] Specific description: the embodiment can adopt any optional basic structure, sealing ring groove processing structure and sealing ring assembly structure in the application to assemble pipelines and valves in the case of following the basic principle of the application, as shown in Figure 31

[0176] 1. When liquid flows from the body inlet inner cavity 13 to the body outlet inner cavity 10, the two-way valve I38 is closed, and the two-way valve II 40 is opened, in this state, the two-way valve I38 disconnects the body inlet inner cavity 13 and the body outlet inner cavity 10 connected with the three-way I39 to make liquid enter the piston's inner cavity 9, the two-way valve II 40 is in the opened state, the three-way II 41 connected with the two-way valve II 40 is connected with the body inlet inner cavity 13 through the check valve 34 and the pipeline 18, but the check valve 34 is not check to the body inlet inner cavity 13, so liquid in the body inlet inner cavity 13 cannot enter the piston's inner cavity 9, the two-way valve II 40 is in the opened state, the three-way II 41 connected with the two-way valve II 40 is connected with the body outlet inner cavity 10 through the check valve 34 and the pipeline 18, the check valve 34 is not check to liquid in the piston's inner cavity 9, so liquid in the piston's inner cavity 9 can flow to the body outlet inner cavity 10 through the two-way valve II 40, the three-way II 41, the check valve 34 and the pipeline 18, at this time, the piston 55 is not pressed, the lower extension end surface 7 of the piston is separated from the body outlet inner cavity stop 8 under the push of liquid in the body inlet inner cavity 13, liquid in the body inlet inner cavity 13 enters the body outlet inner cavity 10 through the body outlet inner cavity stop 8, and the valve is opened.

[0177] ​​2. When liquid flows from the body-out end lumen 10 to the body-in end lumen 13, the two-way valve I 38 is closed and the two-way valve II 40 is opened. In this state, the two-way valve I 38 disconnects the body-in end lumen 13 and the body-out end lumen 10 connected by the three-way I 39 from the liquid inlet of the piston lumen 9. The two-way valve II 40 is opened, and the three-way II 41 connected to the two-way valve II 40 connects the body-out end lumen 10 through the check valve 34 and the pipe 18, but the check valve 34 is a check valve for the body-out end lumen 10, so the liquid in the body-out end lumen 10 cannot enter the piston lumen 9. The two-way valve II 40 is opened, and the three-way II 41 connected to the two-way valve II 40 connects the body-in end lumen 13 through the check valve 34 and the pipe 18, but the check valve 34 is a check valve for the liquid in the piston lumen 9, so the liquid in the piston lumen 9 can flow to the body-in end lumen 13 through the two-way valve II 40, the three-way II 41, the check valve 34 and the pipe 18. Because the outer ring area of the piston 55 is larger than the inner ring area of the body-out end lumen stop 8, the piston 55 is pushed upward by the liquid in the body-out end lumen 10. The extended end surface 7 below the piston 55 moves away from the body-out end lumen stop 8 when the piston 55 moves upward, and the liquid in the body-out end lumen 10 flows to the body-in end lumen 13 through the body-out end lumen stop 8, and the valve is opened.

[0178] 3. When liquid flows from the body-in end lumen 13 to the body-out end lumen 10, the two-way valve I 38 is opened and the two-way valve II 40 is closed. In this state, the two-way valve II 40 disconnects the body-in end lumen 13 and the body-out end lumen 10 connected by the three-way II 41 from the liquid inlet of the piston lumen 9, and the two-way valve I 38 is opened, and the three-way I 39 connected to the two-way valve I 38 connects the body-out end lumen 10 through the check valve 34 and the pipe 18, but the check valve 34 is a check valve for the liquid in the piston lumen 9, so the liquid in the body-in end lumen 13 cannot enter the body-out end lumen 10. The two-way valve I 38 is opened, and the three-way I 39 connected to the two-way valve I 38 connects the body-in end lumen 13 through the check valve 34 and the pipe 18, but the check valve 34 is a check valve for the liquid in the body-in end lumen 13, so the liquid in the body-in end lumen 13 can enter the piston lumen 9. Because the outer ring area of the piston 55 is larger than the inner ring area of the body-out end lumen stop 8, the piston 55 moves downward under pressure, and the extended end surface 7 below the piston 55 seals the body-in end lumen 13 from the body-out end lumen 10 after the piston 55 moves downward, and the valve is closed.

[0179] 4. When liquid flows from the body-out end lumen 10 to the body-in end lumen 13, open the two-way valve I 38 and close the two-way valve II 40. In this state, the two-way valve I 38 disconnects the body-in end lumen 13 and the body-out end lumen 10 connected by the three-way I 39 from the inner lumen 9 of the piston, the two-way valve I 38 is in the open state, the three-way I 39 connected by the two-way valve I 38 is connected to the body-in end lumen 13 through the check valve 34 and the pipe 18, but the check valve 34 does not allow the liquid in the inner lumen 9 of the piston to flow back, so the liquid in the body-out end lumen 10 cannot flow into the body-in end lumen 13, the two-way valve I 38 is in the open state, the three-way I 39 connected by the two-way valve I 38 is connected to the body-out end lumen 10 through the check valve 34 and the pipe 18, but the check valve 34 does not allow the liquid in the body-out end lumen 10 to flow back, so the liquid in the body-out end lumen 10 can flow into the inner lumen 9 of the piston, when the liquid pressure in the inner lumen 9 of the piston is equal to the liquid pressure in the body-out end lumen 10, the piston 55 moves downward under the action of its own weight, the extended end surface 7 below the piston 55 aligns and seals with the body-out end lumen stop 8 after the piston 55 moves downward, cutting off the liquid flow from the body-out end lumen 10 to the body-in end lumen 13, and the valve is closed.

[0180] 5. Specifically, when liquid flows from the body-in end lumen 13 to the body-out end lumen 10 or when liquid flows from the body-out end lumen 10 to the body-in end lumen 13, close the two-way valve I 38 and open the two-way valve II 40, the liquid can flow in both directions; open the two-way valve I 38 and close the two-way valve II 40, the valve can be closed in both directions. Therefore, the valve has the functions of allowing liquid to flow in both directions through the valve and blocking the flow in both directions.

[0181] Example 16

[0182] The diaphragm-free shaft rod bushing spring K-type liquid control valve floating ball valve, the inner lumen 9 of the piston is connected to the body-in end lumen 13 through the pipe 18 and the inlet two-way valve 35, the inner lumen 9 of the piston is connected to the floating ball valve 42 through the outlet two-way valve 36 and the pipe 18, the flange 43 of the body-out end lumen is connected to the pipe 44 to the liquid pool 45, as shown in Figure 32 .

[0183] Specifically, this example can use any of the optional basic structures, sealing ring groove processing structures, and sealing ring assembly structures in the present application to assemble pipes and valves in accordance with the basic principles of the present application, as shown in Figure 32 .

[0184] Liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the inlet two-way valve 35 and the outlet two-way valve 36 are opened, the opening of the inlet two-way valve 35 is set to be smaller than that of the outlet two-way valve 36, the liquid in the body inlet cavity 13 enters the inner cavity 9 of the piston through the pipeline 18 and the inlet two-way valve 35, and then enters the air in the liquid pool 45 through the outlet two-way valve 36, the pipeline 18 and the float valve 42, at this time, the piston 55 is not under pressure, the extended end surface 7 below the piston is pushed by the liquid in the body inlet cavity 13 to move away from the body outlet cavity stop 8, the liquid in the body inlet cavity 13 enters the body outlet cavity 10 through the body outlet cavity stop 8, and then enters the liquid pool 45 through the pipeline 44 connected to the flange 43 of the body outlet cavity; when the liquid in the liquid pool 45 rises to the float valve 42, the float valve 42 is closed, the liquid in the body inlet cavity 13 enters the inner cavity 9 of the piston through the inlet two-way valve 35 and the pipeline 18, and then cannot enter the air in the liquid pool 45 through the outlet two-way valve 36, the pipeline 18 and the float valve 42, because the outer circle area of the piston 55 is larger than the inner circle area of the body outlet cavity stop 8, the piston 55 moves downward under pressure, the extended end surface 7 below the piston is sealed with the body outlet cavity stop 8 after the piston 55 moves downward, cutting off the liquid flowing from the body inlet cavity 13 to the body outlet cavity 10, and the valve is closed.

[0185] Example 17

[0186] The diaphragmless shaft rod bushing spring K type liquid control valve flow limiting valve and check valve, the inner cavity 9 of the piston is connected to one outlet of the hand wheel three-way pilot valve 46 through the check valve 34 and the pipeline 18, another outlet of the hand wheel three-way pilot valve 46 is connected to the liquid inlet 48 of the pump 47 through the pipeline 18, the inlet of the hand wheel three-way pilot valve 46 is connected to the body inlet cavity 13 through the pipeline 18 and the inlet two-way valve 35, the hand wheel three-way pilot valve 46 is provided with a hand wheel 49, and the inner cavity 9 of the piston is connected to the body outlet cavity 10 through the pipeline 18 and the outlet two-way valve 36, as shown in 33.

[0187] Specific description: in this embodiment, any optional basic structure in the application, machining structure of the sealing ring groove and assembly structure of the sealing ring can be used to assemble the pipeline, the valve and the pilot valve in the case of following the basic principle of the application, as shown in Figure 33 .

[0188] Working principle:

[0189] 1. Start the pump 47, liquid flows from the body inlet end inner cavity 13 to the body outlet end inner cavity 10, open the inlet end two-way valve 35 and the outlet end two-way valve 36, set the opening of the inlet end two-way valve 35 to be smaller than that of the outlet end two-way valve 36, at this time the piston 55 will not be pressed, the lower extension end surface 7 of the piston will move away from the body outlet end inner cavity stop 8 under the push of the liquid in the body inlet end inner cavity 13, the liquid in the body inlet end inner cavity 13 will enter the body outlet end inner cavity 10 through the body outlet end inner cavity stop 8, the valve is open; the rotation of the hand wheel 49 can make the liquid in the inlet end 48 of the pump 47 flow into the liquid channel 18 of the hand wheel three-way pilot valve 46, the liquid in the liquid channel 18 of the hand wheel three-way pilot valve 46 will flow into the inner cavity 9 of the piston through the check valve 34, the flow rate of the liquid is guaranteed to ensure that the pressure in the body outlet end inner cavity 10 is at a set value; when the flow rate of the liquid in the inlet end 48 of the pump 47 changes, the sensing diaphragm in the hand wheel three-way pilot valve 46 will control the flow rate of the liquid flowing into the inner cavity 9 of the piston through the liquid channel 18 and the check valve 34, so that the opening of the piston 55 will change accordingly, thereby ensuring that the pressure in the body outlet end inner cavity 10 will not change with the flow rate of the liquid in the inlet end 48 of the pump 47, achieving the purpose of flow limiting.

[0190] 2. Close the pump 47, liquid flows from the body outlet end inner cavity 10 to the body inlet end inner cavity 13, because the inner cavity 9 of the piston is blocked by the check valve 34, the liquid in the inner cavity 9 of the piston will not flow into the body inlet end inner cavity 13 through the check valve 34, the liquid channel 18, the hand wheel three-way pilot valve 46 and the inlet end two-way valve 35, nor will it flow into the inlet end 48 of the pump 47 through the liquid channel 18, the liquid in the body outlet end inner cavity 10 will flow into the inner cavity 9 of the piston through the outlet end two-way valve 36 and the liquid channel 18, when the liquid pressure in the inner cavity 9 of the piston is equal to that in the body outlet end inner cavity 10, the piston 55 will move downward under the action of gravity, the lower extension end surface 7 of the piston will align with the body outlet end inner cavity stop 8 after the downward movement of the piston 55, thereby sealing and cutting off the flow of liquid from the body outlet end inner cavity 10 to the body inlet end inner cavity 13, the valve is closed, achieving the purpose of check.

[0191] Example 18

[0192] The K-type liquid control valve of the spring-loaded sleeve of the shaft without diaphragm, the inner cavity 9 of the piston is connected to an inlet of a two-way pilot valve 50 through a liquid channel 18, the outlet of the two-way pilot valve 50 is connected to the body outlet end inner cavity 10 through the outlet end two-way valve 36 and the liquid channel 18, the inner cavity 9 of the piston is connected to the body inlet end inner cavity 13 through the inlet end two-way valve 35 and the liquid channel 18, the top of the two-way pilot valve 50 is provided with a screw rod 51, as shown in Figure 34 .

[0193] Specific description: this example can use any optional basic structure in the present application, as well as the processing structure of the sealing ring groove and the assembly structure of the sealing ring, which are assembled with pipelines, valves and pilot valves in the case of following the basic principles of the present application, as shown in Figure 34 .

[0194] Working principle:

[0195] Liquid flows from the body inlet cavity 13 to the body outlet cavity 10, the inlet two-way valve 35 and the outlet two-way valve 36 are opened, and the opening degree of the inlet two-way valve 35 is set to be smaller than that of the outlet two-way valve 36. At this time, the piston 55 will not be pressed, and the lower extension surface 7 of the piston will be pushed by the liquid in the body inlet cavity 13 to move away from the body outlet cavity stop 8. The liquid in the body inlet cavity 13 enters the body outlet cavity 10 through the body outlet cavity stop 8, and the valve is opened. The rotation of the screw rod 51 on the two-way pilot valve 50 can set the flow rate of the liquid in the inner cavity 9 of the piston 55 to enter the body outlet cavity 10 through the outlet two-way valve 36 to a certain value, so that the liquid pressure in the body outlet cavity 10 is fixed to a certain value. When the liquid pressure in the body outlet cavity 10 changes, the sensing diaphragm in the two-way pilot valve 50 can control the flow rate of the liquid in the inner cavity 9 of the piston 55 to enter the body outlet cavity 10, so that the opening degree of the piston 55 changes with the change of the liquid pressure in the body outlet cavity 10, and the purpose of pressure reduction and pressure stabilization is achieved.

[0196] Example 19

[0197] The pressure relief valve of the diaphragm-free shaft rod sleeve spring K type liquid control valve, the inner cavity 9 of the piston is connected to an outlet of the three-way pilot valve 52 through the pipeline 18, another outlet of the three-way pilot valve 52 is connected to the body outlet cavity 10 through the outlet two-way valve 36 and the pipeline 18, the body inlet cavity 13 is connected to the inlet of the three-way pilot valve 52 through the inlet two-way valve 35 and the pipeline 18, the inner cavity 9 of the piston is connected to the body outlet cavity 10 through the two-way valve III 53 and the pipeline 18, and the three-way pilot valve 52 is provided with a screw rod 51 at the top, as shown in Figure 35 .

[0198] Specific description: this embodiment can adopt any optional basic structure in the application, and the machining structure and the sealing ring assembly structure of the sealing ring groove are assembled in the pipeline, the valve, and the pilot valve while following the basic principle of the application, as shown in Figure 35 .

[0199] Working principle:

[0200] 1. Liquid flows from the body outlet inner chamber 10 to the body inlet inner chamber 13, the inlet two-way valve 35, the outlet two-way valve 36 and the two-way valve III 53 are opened; the liquid in the body outlet inner chamber 10 flows through the pipe 18 and the two-way valve III 53 into the inner chamber 9 of the piston, and then through the pipe 18 and the outlet two-way valve 36 into the three-way pilot valve 52; the top screw 51 of the three-way pilot valve 52 is adjusted to a certain position, when the pressure in the body outlet inner chamber 10 rises to a set value, the liquid in the body outlet inner chamber 10 will flow through the pipe 18 and the outlet two-way valve 36 into the three-way pilot valve 52 to open the pipe connecting the three-way pilot valve 32, the inlet two-way valve 35 and the pipe 18, and then the inner chamber 9 of the piston is connected to the pipe 18 of the three-way pilot valve 52, so that the liquid in the inner chamber 9 of the piston is discharged into the body inlet inner chamber 13; the amount of liquid in the body outlet inner chamber 10 flowing into the inner chamber 9 of the piston through the pipe 18 and the two-way valve III 53 is set to be less than the amount of liquid discharged from the inner chamber 9 of the piston into the body inlet inner chamber 13; because the outer circle area of the piston 55 is larger than the inner circle area of the body outlet inner chamber stop 7, the piston 55 is pushed by the liquid in the body outlet inner chamber 10 to move upward, and the extended end surface 7 below the piston moves away from the body outlet inner chamber stop 8 when the piston 55 moves upward, so that the liquid in the body outlet inner chamber 10 flows into the body inlet inner chamber 13 through the body outlet inner chamber stop 7, the valve is opened, and the purpose of pressure relief is achieved.

[0201] When the liquid pressure in the body outlet inner chamber 10 is lower than the set value, the liquid pressure in the body outlet inner chamber 10 cannot open the pipe connecting the three-way pilot valve 52, the inlet two-way valve 35 and the pipe 18, and the pipe connecting the inner chamber 9 of the piston and the pipe 18 of the three-way pilot valve 52 through the pipe 18 and the outlet two-way valve 36, so the liquid in the inner chamber 9 of the piston cannot be discharged into the body inlet inner chamber 13, but the liquid in the body outlet inner chamber 10 can flow into the inner chamber 9 of the piston through the pipe 18 and the two-way valve III 53; when the liquid pressure in the inner chamber 9 of the piston is the same as the liquid pressure in the body outlet inner chamber 10, the piston 55 moves downward under the action of its own weight, and the extended end surface 7 below the piston moves to abut and seal with the body outlet inner chamber stop 8 after the piston 55 moves downward, so that the liquid in the body outlet inner chamber 10 is cut off from flowing into the body inlet inner chamber 13, the valve is closed, and the valve no longer discharges pressure.

Claims

1. A diaphragmless K-type liquid control valve with a shaft sleeve spring, characterized in that: The invention relates to a piston cylinder, comprising a cover (1), a body (3), a piston cylinder inner ring (4), a piston (55), a sealing ring groove (5) arranged on the outer wall of the piston (55), a sealing ring (6), an extended end surface (7) below the piston, and a body outlet end inner cavity stop (8); the piston cylinder inner ring (4) is arranged in one of the following seven ways: arranged on the piston (55) corresponding to the cover (1), arranged on the piston (55) corresponding to the body (3), arranged on the piston (55) corresponding to the cover (1) and the body (3), arranged on the piston (55) corresponding to the seat (2), wherein the seat (2) is between the cover (1) and the body (3), arranged on the piston (55) corresponding to the cover (1) and the seat (2), arranged on the piston (55) corresponding to the seat (2) and the body (3), arranged on the piston (55) corresponding to the cover (1), the seat (2), and the body (3); the sealing ring (6) is arranged in the sealing ring groove (5), the piston (55) is arranged in the piston cylinder inner ring (4), the piston (55) and the extended end surface (7) below the piston form an integral whole, the cover (1) and the body (3), or the cover (1), the seat (2), and the body (3) form an integral whole; the inner ring (11) of the sealing ring is sealed with the sealing ring groove (5), the outer ring (12) of the sealing ring is static sealed and sliding sealed with the piston cylinder inner ring (4), so that the inner cavity (9) of the piston and the body outlet end inner cavity (10) are sealed; the body (3) has a body inlet end inner cavity (13) and a body outlet end inner cavity (10), the extended end surface (7) below the piston is sealed with the body outlet end inner cavity stop (8) after the piston (55) moves, so that the body inlet end inner cavity (13) and the body outlet end inner cavity (10) are sealed; the inner cavity (9) of the piston is connected with the body inlet end inner cavity (13) through a pipeline (18) provided with a first valve (19), and is connected with the body outlet end inner cavity (10) through a pipeline (18) provided with a second valve (57); the inner ring (11) of the sealing ring is elastically retained and in contact with the sealing ring groove (5), the outer ring (12) of the sealing ring (6) is elastically retained and in static contact and sliding contact with the piston cylinder inner ring (4), the sealing ring (6) expands and contracts with the increase and decrease of the liquid pressure once the direction of the sealing ring expansion opening (17) is pressed by the liquid, and the sealing ring (6) does not expand and contract with the increase and decrease of the liquid pressure if the direction of the sealing ring expansion opening (17) is pressed by the liquid in the opposite direction; the direction of the sealing ring expansion opening (17) is towards the inner cavity (9) of the piston; the cross section of the sealing ring (6) is circular, and the longitudinal section is V-shaped (15). When the liquid flows from the body inlet cavity (13) to the body outlet cavity (10), the first valve (19) on the side of the body inlet cavity (13) is closed, and the second valve (57) on the side of the body outlet cavity (10) is opened. The liquid in the body inlet cavity (13) cannot enter the inner cavity (9) of the piston, and the inner cavity (9) of the piston is in communication with the body outlet cavity (10). The liquid in the body inlet cavity (13) enters the body outlet cavity (10) through the body outlet cavity stop (8); When the liquid flows from the body inlet cavity (13) to the body outlet cavity (10), the first valve (19) on the side of the body inlet cavity (13) is opened, and the second valve (57) on the side of the body outlet cavity (10) is closed. The liquid in the body inlet cavity (13) enters the inner cavity (9) of the piston, and the inner cavity (9) of the piston is not in communication with the body outlet cavity (10). The pressure of the liquid in the inner cavity (9) of the piston is the same as that in the body inlet cavity (13). There is a very small pressure difference between the liquid pressure in the body inlet cavity (13) and the liquid pressure in the body outlet cavity (10), and the liquid will not leak into the body outlet cavity (10). After the piston (55) is pressed, it moves downward. The distance between the extended end surface (7) below the piston and the body outlet cavity stop (8) will gradually approach as the piston (55) moves downward. The liquid pressure difference between the body inlet cavity (13) and the body outlet cavity (10) will gradually increase. The direction of the sealing ring expansion opening (17) will be expanded by the liquid pressure sealing ring (6) as the liquid pressure increases. At this time, the sealing ring (6) tends to be in an expanded state in the sealing ring groove (5), so that the extended end surface (7) below the piston and the body outlet cavity stop (8) remain in a parallel position. The piston (55) continues to move downward, and the distance between the extended end surface (7) below the piston and the body outlet cavity stop (8) approaches as the piston (55) moves downward. This ensures that the piston (55) will not shake, so that the valve achieves a parallel, non-shaking, and sealing fit between the extended end surface (7) below the piston and the body outlet cavity stop (8); When the liquid flows from the body outlet cavity (10) to the body inlet cavity (13), the first valve (19) on the side of the body inlet cavity (13) is closed, and the second valve (57) on the side of the body outlet cavity (10) is opened. The liquid in the body outlet cavity (10) enters the inner cavity (9) of the piston, and the liquid in the inner cavity (9) of the piston cannot flow into the body inlet cavity (13) through the pipeline (18) and the first valve (19) on the side of the body inlet cavity (13). At this time, the liquid pressure in the inner cavity (9) of the piston is the same as that in the body outlet cavity (10). The piston (55) will move downward under the action of its own weight. The extended end surface (7) below the piston will be in sealing fit with the body outlet cavity stop (8) after the piston (55) moves downward, cutting off the flow of liquid from the body outlet cavity (10) to the body inlet cavity (13). The valve is closed.

2. A diaphragmless K-type liquid control valve with a shaft sleeve spring, characterized in that: The invention relates to a piston cylinder, comprising a cover (1), a body (3), a piston cylinder inner ring (4), a piston (55), a sealing ring groove (5) arranged on the outer wall of the piston (55), a sealing ring (6), an extended end surface (7) below the piston, and a body outlet end inner cavity stop (8); the piston cylinder inner ring (4) is arranged in one of the following seven ways: arranged on the piston (55) corresponding to the cover (1), arranged on the piston (55) corresponding to the body (3), arranged on the piston (55) corresponding to the cover (1) and the body (3), arranged on the piston (55) corresponding to the seat (2), wherein the seat (2) is between the cover (1) and the body (3), arranged on the piston (55) corresponding to the cover (1) and the seat (2), arranged on the piston (55) corresponding to the seat (2) and the body (3), arranged on the piston (55) corresponding to the cover (1), the seat (2), and the body (3); the sealing ring (6) is arranged in the sealing ring groove (5), the piston (55) is arranged in the piston cylinder inner ring (4), the piston (55) and the extended end surface (7) below the piston form an integral whole, the cover (1) and the body (3), or the cover (1), the seat (2), and the body (3) form an integral whole; the inner ring (11) of the sealing ring is sealed with the sealing ring groove (5), the outer ring (12) of the sealing ring is static sealed and sliding sealed with the piston cylinder inner ring (4), so that the inner cavity (9) of the piston and the body outlet end inner cavity (10) are sealed; the body (3) has a body inlet end inner cavity (13) and a body outlet end inner cavity (10), the extended end surface (7) below the piston is sealed with the body outlet end inner cavity stop (8) after the piston (55) moves, so that the body inlet end inner cavity (13) and the body outlet end inner cavity (10) are sealed; the inner cavity (9) of the piston is connected with the body inlet end inner cavity (13) through a pipeline (18) provided with a first valve (19), and is connected with the body outlet end inner cavity (10) through a pipeline (18) provided with a second valve (57); the inner ring (11) of the sealing ring is elastically retained and in contact with the sealing ring groove (5), the outer ring (12) of the sealing ring (6) is elastically retained and in static contact and sliding contact with the piston cylinder inner ring (4), the sealing ring (6) expands and contracts with the increase and decrease of the liquid pressure once the direction of the sealing ring expansion opening (17) is pressed by the liquid, and the sealing ring (6) does not expand and contract with the increase and decrease of the liquid pressure if the direction of the sealing ring expansion opening (17) is pressed by the liquid in the opposite direction; the direction of the sealing ring expansion opening (17) is opposite to the direction of the inner cavity (9) of the piston; the cross section of the sealing ring (6) is circular, and the longitudinal section is V-shaped (15). When the liquid flows from the inlet end cavity (13) to the outlet end cavity (10), the first valve (19) on the inlet end cavity (13) side is closed, and the second valve (57) on the outlet end cavity (10) side is opened. The liquid in the inlet end cavity (13) cannot enter the piston cavity (9). The piston cavity (9) is connected to the outlet end cavity (10). The liquid in the inlet end cavity (13) enters the outlet end cavity (10) through the outlet end cavity stop (8). When the liquid flows from the body outlet cavity (10) to the body inlet cavity (13), the first valve (19) on the body inlet cavity (13) side is opened and the second valve (57) on the body outlet cavity (10) side is closed. The liquid in the body outlet cavity (10) cannot enter the piston cavity (9), while the liquid in the piston cavity (9) flows into the body inlet cavity (13) through the pipe (18) and the first valve (19) on the body inlet cavity (13) side. At this time, the liquid pressure in the piston cavity (9) is the same as the liquid pressure in the body inlet cavity (13). When the piston (55) moves upward, the extended end face (7) below the piston leaves the body outlet cavity stop (8). The liquid in the body outlet cavity (10) flows into the body inlet cavity (13) through the body outlet cavity stop (8), and the valve is opened. When the liquid flows from the body outlet cavity (10) to the body inlet cavity (13), the first valve (19) on the body inlet cavity (13) side is closed, and the second valve (57) on the body outlet cavity (10) side is opened. The liquid in the body outlet cavity (10) enters the piston cavity (9), while the liquid in the piston cavity (9) cannot flow into the body inlet cavity (13) through the pipe (18) and the first valve (19) on the body inlet cavity (13). At this time, the liquid pressure in the piston cavity (9) is the same as the liquid pressure in the body outlet cavity (10). The piston (55) will move downward under its own weight. After the piston (55) moves downward, the extended end face (7) below the piston matches and seals with the body outlet cavity stop (8) after the piston (55) moves downward, cutting off the flow of liquid from the body outlet cavity (10) to the body inlet cavity (13). The valve is closed.

3. A diaphragmless K-type liquid control valve with a shaft sleeve spring, characterized in that: Includes a cover (1), a body (3), a piston cylinder inner ring (4), a piston (55), a sealing ring groove (5) on the outer wall of the piston (55), a sealing ring (6), an extended end face (7) below the piston, and a stop (8) in the inner cavity of the body outlet; the piston cylinder inner ring (4) is provided in one of the following seven forms: It is positioned at the position corresponding to the piston (55) and the cover (1). It is positioned at the location corresponding to the piston (55) and the body (3). At the same time, it is set at the positions corresponding to the piston (55) and the cover (1) and body (3). It is positioned at the location corresponding to the piston (55) and the seat (2), wherein the seat (2) is located between the cover (1) and the body (3). At the same time, it is set at the corresponding positions of the piston (55) and the cover (1) and the seat (2). At the same time, it is set at the positions corresponding to the piston (55) and the seat (2) and body (3). At the same time, it is set at the corresponding positions of the piston (55) and the cover (1), seat (2), and body (3); The sealing ring (6) is placed in the sealing ring groove (5), the piston (55) is placed in the piston cylinder inner ring (4), the piston (55) and the piston lower extension end face (7) are a whole, the cover (1) and body (3) are sealed together as a whole, or the cover (1), seat (2) and body (3) are sealed together as a whole; The inner ring (11) of the sealing ring is sealed with the sealing ring groove (5), and the outer ring (12) of the sealing ring is statically and slidingly sealed with the inner ring (4) of the piston cylinder, so that the inner cavity (9) of the piston is sealed with the inner cavity (10) of the body outlet. The body (3) has an inlet end cavity (13) and an outlet end cavity (10). The lower extension end face (7) of the piston matches and seals with the outlet end cavity stop (8) after the piston (55) moves, so that the inlet end cavity (13) and the outlet end cavity (10) are sealed. The inner cavity (9) of the piston is connected to the inner cavity (13) of the body inlet via a pipe (18) equipped with a first valve (19), and the inner cavity (9) of the piston is connected to the inner cavity (10) of the body outlet via a pipe (18) equipped with a second valve (57). The inner ring (11) of the sealing ring has elastic retention and seals with the sealing ring groove (5). The outer ring (12) of the sealing ring (6) has elastic retention and seals with the piston cylinder inner ring (4) in static and sliding contact. Once the direction of the sealing ring expansion port (17) is pressurized by liquid, the sealing ring (6) will expand and contract with the increase and decrease of hydraulic pressure. If the sealing ring expansion port (17) is pressurized by hydraulic pressure in the opposite direction, the sealing ring (6) will not expand and contract with the increase and decrease of hydraulic pressure. There are two sealing rings (6). Among the two sealing rings (6), the sealing ring expansion port (17) of the sealing ring near the inner cavity stop (8) of the body outlet is directed toward the inner cavity (9) of the piston, and the sealing ring expansion port (17) of the sealing ring near the cover (1) is directed toward the opposite direction of the inner cavity (9) of the piston. The sealing ring (6) has a circular cross-section and a V-shaped longitudinal section (15). When the liquid flows from the inlet end cavity (13) to the outlet end cavity (10), the first valve (19) on the inlet end cavity (13) side is closed, and the second valve (57) on the outlet end cavity (10) side is opened. The liquid in the inlet end cavity (13) cannot enter the piston cavity (9). The piston cavity (9) is connected to the outlet end cavity (10). The liquid in the inlet end cavity (13) enters the outlet end cavity (10) through the outlet end cavity stop (8). When the liquid flows from the inlet end cavity (13) to the outlet end cavity (10), the first valve (19) on the inlet end cavity (13) side is opened, and the second valve (57) on the outlet end cavity (10) side is closed. The liquid in the inlet end cavity (13) enters the piston cavity (9). The piston cavity (9) and the outlet end cavity (10) are not connected. The liquid pressure in the piston cavity (9) and the inlet end cavity (13) are the same. There will be a very small pressure difference between the liquid pressure in the inlet end cavity (13) and the liquid pressure in the outlet end cavity (10). The liquid will not leak into the outlet end cavity (10). After being compressed, the piston (55) moves downward. The extended end face (7) below the piston moves downward and interacts with the outlet end cavity (10). The distance between the inner cavity stop (8) of the end cavity will gradually approach, and the liquid pressure difference between the inner cavity (13) of the body inlet end and the inner cavity (10) of the body outlet end will gradually increase. The direction of the sealing ring expansion port (17) is affected by the liquid pressure. The sealing ring (6) will expand with the increase of hydraulic pressure. At this time, the sealing ring (6) tends to expand in the sealing ring groove (5), so that the lower extension end face (7) of the piston and the inner cavity stop (8) of the body outlet end are kept in a parallel position. The piston (55) continues to move downward. When the distance between the lower extension end face (7) of the piston and the inner cavity stop (8) of the body outlet end is close after the piston (55) moves downward, it ensures that the piston (55) will not shake, so that the valve can achieve a parallel and vibration-free sealing between the lower extension end face (7) of the piston and the inner cavity stop (8) of the body outlet end. When the liquid flows from the body outlet cavity (10) to the body inlet cavity (13), the first valve (19) on the body inlet cavity (13) side is opened and the second valve (57) on the body outlet cavity (10) side is closed. The liquid in the body outlet cavity (10) cannot enter the piston cavity (9), while the liquid in the piston cavity (9) flows into the body inlet cavity (13) through the pipe (18) and the first valve (19) on the body inlet cavity (13) side. At this time, the liquid pressure in the piston cavity (9) is the same as the liquid pressure in the body inlet cavity (13). When the piston (55) moves upward, the extended end face (7) below the piston leaves the body outlet cavity stop (8). The liquid in the body outlet cavity (10) flows into the body inlet cavity (13) through the body outlet cavity stop (8), and the valve is opened. When the liquid flows from the body outlet cavity (10) to the body inlet cavity (13), the first valve (19) on the body inlet cavity (13) side is closed, and the second valve (57) on the body outlet cavity (10) side is opened. The liquid in the body outlet cavity (10) enters the piston cavity (9), while the liquid in the piston cavity (9) cannot flow into the body inlet cavity (13) through the pipe (18) and the first valve (19) on the body inlet cavity (13). At this time, the liquid pressure in the piston cavity (9) is the same as the liquid pressure in the body outlet cavity (10). The piston (55) will move downward under its own weight. After the piston (55) moves downward, the extended end face (7) below the piston matches and seals with the body outlet cavity stop (8) after the piston (55) moves downward, cutting off the flow of liquid from the body outlet cavity (10) to the body inlet cavity (13). The valve is closed.

4. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The cross-section of the inner ring (4) of the piston cylinder is circular, the cross-section of the piston (55) is circular and the longitudinal section is U-shaped (20), the cross-section of the sealing ring groove (5) is circular and the longitudinal section is concave (14), the center line position of the inner ring (4) of the piston cylinder is the same as the center line position of the piston (55), and the cross-section of the inner cavity stop (8) of the body outlet is circular.

5. The diaphragmless shaft sleeve spring-type K-type liquid control valve according to claim 4, characterized in that: The inner diameter of the inner cavity stop (8) of the body outlet end is smaller than the outer diameter of the piston (55). The ring plane of the inner ring (4) of the piston cylinder is parallel to the ring plane of the inner cavity stop (8) of the body outlet end, and the center line position is the same. The center line position of the ring plane of the inner ring (4) of the piston cylinder is the same as the center line position of the piston (55) placed in the inner ring (4) of the piston cylinder. The outer ring (12) of the sealing ring (6) needs to contact the inner ring (4) of the piston cylinder. The direction of the piston inner diameter opening (56) of the piston (55) is towards the inner cavity (9) of the piston or towards the opposite direction of the inner cavity (9) of the piston. The piston (55) and the piston lower extension end face (7) are vertically connected and fixed into a whole.

6. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The piston cylinder inner ring (4) is set on the first piston cylinder inner ring seat (23). The number of sealing rings (6) is the same as the number of machined sealing ring grooves (5) and the model is matched. The first piston cylinder inner ring seat (23) and the body (3) are sealed and connected as a whole by fasteners. The cover (1) and the body (3) are sealed and connected as a whole by screws (21).

7. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: A second piston cylinder inner ring seat (25) is provided between the cover (1) and the body (3). The piston cylinder inner ring (4) is set on the second piston cylinder inner ring seat (25). The number of sealing rings (6) is the same as the number of machined sealing ring grooves (5) and the model is matched. The cover (1), the second piston cylinder inner ring seat (25), and the body (3) are sealed together and connected as a whole by fasteners.

8. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: A stop port (26) is provided above or below the inner ring (4) of the piston cylinder. The ring plane of the stop port (26) is parallel to the ring plane of the inner ring (4) of the piston cylinder and the center line is the same. The upper outward extension portion (27) of the sealing ring groove (5) or the lower end face (28) of the sealing ring groove (5) matches and seals with the stop port (26) after the piston (55) moves down. The lower extension end face (7) of the piston matches and seals with the stop port (8) of the inner cavity of the body outlet. The upper outward extension portion (27) of the sealing ring groove (5) is provided with a first sealing surface (29). The lower end face (28) of the sealing ring groove (5) is provided with a second sealing surface (30). The cover (1) and the body (3) are sealed and connected into a whole by fasteners.

9. The diaphragmless shaft sleeve spring-type K-type liquid control valve according to any one of claims 1-3, characterized in that: The seat (2) is provided with a stop port (26). The plane of the stop port (26) is parallel to the plane of the inner ring (4) of the piston cylinder and the center line is the same. The upper outward extension part (27) of the sealing ring groove (5) or the lower end face (28) of the sealing ring groove (5) matches and seals with the stop port (26) after the piston (55) moves down. The lower extension end face (7) of the piston matches and seals with the stop port (8) of the inner cavity of the body outlet. The upper outward extension part (27) of the sealing ring groove (5) has a first sealing surface (29), and the lower end face (28) of the sealing ring groove (5) has a second sealing surface (30). The cover (1), seat (2), and body (3) are sealed and connected into a whole by fasteners.

10. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: A shaft (31) is mounted on the cover (1) and extends into the inner cavity (9) of the piston, and the shaft (31) is sealed at the contact point with the cover (1).

11. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to the inner cavity (13) at the body inlet, and the inner cavity (9) of the piston is connected to the inner cavity (10) at the body outlet via a valved pipe or directly through a pipe.

12. The diaphragmless shaft sleeve spring K-type liquid control valve according to claim 11, characterized in that: An electric actuator (54) is installed on the valve, and the electric actuator (54) performs valve switching.

13. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to a three-way valve (33) via a pipe (18). One outlet of the three-way valve (33) is connected to the inner cavity (13) of the body via a pipe (18), or one outlet of the three-way valve (33) is connected to the inner cavity (13) of the body via a pipe (18) and a check valve (34), and the other outlet is connected to the inner cavity (10) of the body via a pipe (18).

14. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to the inner cavity (13) of the body via pipe (18) and inlet two-way valve (35), and the inner cavity (9) of the piston is connected to the inner cavity (10) of the body via pipe (18) and outlet two-way valve (36). or The inner cavity (9) of the piston is connected to the inner cavity (13) of the pipe (18), the inlet two-way valve (35), and the semi-closed check valve (37). The inner cavity (9) of the piston is connected to the inner cavity (10) of the pipe (18), the outlet two-way valve (36), and the semi-closed check valve (37).

15. The diaphragmless shaft sleeve spring-type K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to a three-way valve I (39) via a two-way valve I (38). A check valve (34) is installed at each of the two outlets of the three-way valve I (39). The outlet of one check valve (34) is connected to the inner cavity (13) of the body via a pipe (18), and the outlet of the other check valve (34) is connected to the inner cavity (10) of the body via a pipe (18). The piston's inner cavity (9) is connected to a three-way valve II (41) via a two-way valve II (40). A check valve (34) is installed at each of the two outlets of the three-way valve II (41). The outlet of one check valve (34) is connected to the inner cavity (13) at the inlet of the body via a pipe (18), and the outlet of the other check valve (34) is connected to the inner cavity (10) at the outlet of the body via a pipe (18).

16. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to the inner cavity (13) of the body through the pipe (18) and the inlet two-way valve (35). The inner cavity (9) of the piston is connected to the float valve (42) through the outlet two-way valve (36) and the pipe (18). The flange (43) of the outlet inner cavity is connected to the pipe to the liquid pool (45).

17. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to one outlet of the handwheel three-way pilot valve (46) via a check valve (34) and a pipe (18). The other outlet of the handwheel three-way pilot valve (46) is connected to the liquid inlet (48) of the pump (47) via a pipe (18). The inlet of the handwheel three-way pilot valve (46) is connected to the inner cavity (13) of the body via a pipe (18) and an inlet two-way valve (35). The handwheel three-way pilot valve (46) has a handwheel (49). The inner cavity (9) of the piston is connected to the inner cavity (10) of the body via a pipe (18) and an outlet two-way valve (36).

18. The diaphragmless shaft sleeve spring K-type liquid control valve according to any one of claims 1-3, characterized in that: The inner cavity (9) of the piston is connected to one inlet of the two-way pilot valve (50) via the pipe (18). The outlet of the two-way pilot valve (50) is connected to the outlet inner cavity (10) of the body via the outlet two-way valve (36) and the pipe (18). The inner cavity (9) of the piston is connected to the inlet inner cavity (13) of the body via the pipe (18) and the inlet two-way valve (35). A screw (51) is provided on the top of the two-way pilot valve (50). or The inner cavity (9) of the piston is connected to one outlet of the three-way pilot valve (52) via a pipe (18). The other outlet of the three-way pilot valve (52) is connected to the inner cavity (10) of the body outlet via an outlet two-way valve (36) and a pipe (18). The inner cavity (13) of the body inlet is connected to the inlet of the three-way pilot valve (52) via an inlet two-way valve (35) and a pipe (18). The inner cavity (9) of the piston is connected to the inner cavity (10) of the body outlet via a two-way valve III (53) and a pipe (18). A screw (51) is provided on the top of the three-way pilot valve (52).

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