Spring-loaded Z-type liquid control valve without diaphragm

Abstract

The application discloses a Z-shaped liquid control valve without diaphragm, shaft rod, shaft sleeve and spring. The liquid control valve comprises a cover, a body, a sealing ring groove, a sealing ring, a piston, an extended end surface below the piston and a cavity stopper in the outlet end of the body. The sealing ring groove is arranged on the cover, the body, both the cover and the body, a seat between the cover and the body, both the cover and the seat, both the seat and the body, or both the cover, the seat and the body. The sealing ring is arranged in the sealing ring groove, the piston is arranged in the sealing ring, the cover and the body, or the cover, the seat and the body are sealed into an integral whole, and the piston and the extended end surface below the piston form an integral whole. The application does not need to use a diaphragm, a shaft rod, a shaft sleeve and a spring, has a simple structure and small water head loss.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of Z type liquid control valve of membraneless shaft sleeve spring, especially by different processing structure and the assembly form of sealing ring can form the membraneless shaft sleeve spring liquid control valve 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; When running, liquid flow direction can only be controlled in one direction valve; In the case of working condition, static liquid flow cannot be set.

[0003] The existing liquid control valve is installed diaphragm to push the intercepting pressure plate connected with shaft to close and open valve, it is quite difficult to replace diaphragm once diaphragm is damaged, and it needs professional technical personnel to replace, especially for large-diameter valve, it is more difficult to replace 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 navigate and push the intercepting pressure plate connected with shaft to effectively close and open valve, because shaft and sleeve are needed, scaling phenomenon is easy to occur in many liquids, which can cause valve closing or opening failure.

[0005] The existing liquid control valve, when running, liquid flow direction can only be controlled in one direction valve, 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 valve, the spring force can cause a certain pressure loss of starting pressure when valve is opened, so that the demand of starting pressure is large, and the head loss of valve is large, 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, by different structure processing assembly type, without using diaphragm, shaft and sleeve, spring, a new kind of membraneless shaft sleeve spring Z type liquid control valve can meet the demand of various liquid flow conditions. In the case of working condition, liquid flow direction can pass through membraneless shaft sleeve spring Z type liquid control valve in one direction or two directions, and membraneless shaft sleeve spring Z type liquid control valve can be closed in one direction or two directions; In the case of working condition, membraneless shaft sleeve spring Z type liquid control valve can set static liquid flow.

[0008] The Z-shaped liquid control valve of the present application comprises a cover, a body, a sealing ring groove, a sealing ring, a piston, an extended end surface below the piston, and a cavity stopper at the outlet end of the body. The sealing ring groove is on the top of the cover and the top of the body. The sealing ring is installed in the sealing ring groove. The piston is placed in the sealing ring. The piston and the extended end surface below the piston are an integral whole. The cover and the body are sealed and fixed as an integral whole. The piston cavity and the cavity at the outlet end of the body are sealed. The outer ring of the sealing ring is sealed with the sealing ring groove, and the inner ring of the sealing ring is sealed and slid with the outer ring of the piston. The extended end surface below the piston is sealed with the cavity stopper at the outlet end of the body after the movement of the piston. The piston cavity, the cavity at the inlet end of the body, and the cavity at the outlet end of the body are connected via a pipeline, a valve connection, and a pilot valve connection. The pipeline connection, the valve connection, and the pilot valve connection between the piston cavity, the cavity at the inlet end of the body, and the cavity at the outlet end of the body can form a liquid control valve that meets different working conditions.

[0009] The extended end surface below the piston has a sealing surface I. The outer ring of the sealing ring is in contact with the sealing ring groove, which means that the outer ring of the sealing ring has elasticity to keep in contact with the sealing ring groove. The inner ring of the sealing ring is in static sealing and sliding sealing with the outer ring of the piston, which means that the inner ring of the sealing ring has elasticity to keep in static sealing and sliding sealing with the outer ring of the piston. The outer ring of the sealing ring and the inner ring of the sealing ring have elasticity. Once the direction of the expansion opening of the sealing ring is pressed by the liquid, the sealing ring will expand and contract with the increase and decrease of the liquid pressure. If the opposite direction of the expansion opening of the sealing ring is pressed by the liquid, 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. The direction of the expansion opening of the sealing ring is towards the piston cavity or the opposite direction of the piston cavity. The cover and the body, or the cover, the seat, and the body are sealed and fixed as an integral whole. The piston cavity, the cavity at the inlet end of the body, and the cavity at the outlet end of the body are connected via a pipeline with a valve or directly connected via a pipeline, a valve connection, and a pilot valve connection.

[0010] In some embodiments of the present application, the plane of the sealing ring groove is circular, the cross-sectional structure is concave, the plane of the sealing ring is circular, the cross-sectional shape is V-shaped, the plane of the piston is circular, the cross-sectional shape is U-shaped, the plane of the outlet end cavity stopper is circular, the inner diameter of the outlet end cavity stopper is smaller than the outer diameter of the piston, the circle plane of the sealing ring groove is parallel to the circle plane of the body outlet end cavity stopper and has the same center line position, the circle plane of the sealing ring groove has the same center line position as the piston placed in the sealing ring and is perpendicular, the outer circle of the piston placed in the sealing ring needs to contact the inner circle of the sealing ring, the direction of the piston inner diameter port of the piston placed in the sealing ring is towards the piston inner cavity or the opposite direction, the piston is vertically connected and fixed with the lower extension end surface to form an integral whole, the lower extension end surface has a sealing surface, the outer circle of the sealing ring has elasticity to keep in contact with the sealing ring groove, the inner circle of the sealing ring has elasticity to keep in contact and sliding contact with the outer circle of the piston, the outer circle and the inner circle of the sealing ring have elasticity to keep in contact, once the direction of the sealing ring expansion port is pressed by the liquid, the sealing ring will expand and contract with the increase and decrease of the liquid pressure, if the opposite direction of the sealing ring expansion port is pressed by the liquid, 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, the direction of the sealing ring expansion port is towards the piston inner cavity or the opposite direction, the cover and the body are sealingly connected and fixed to form an integral whole. The piston inner cavity, the body inlet end cavity, and the body outlet end cavity are connected through pipelines, valves, and pilot valves. The connection between the piston inner cavity, the body inlet end cavity, and the body outlet end cavity through pipelines, valves, and pilot valves can form a liquid control valve that meets different working conditions.

[0011] Sealing ring groove processing structure and sealing ring assembly structure:

[0012] The sealing ring groove processing structure and the sealing ring assembly structure have the following 14 structure forms, but during the manufacturing and installation of the valve, the form of the sealing ring groove processing structure and the sealing ring assembly structure may be changed as needed, as long as the basic structural principles of the present application are followed, the form changes of the sealing ring groove processing structure and the sealing ring assembly structure beyond the scope of the present application are also within the protection scope of the present application.

[0013] In some embodiments of the present application, the sealing ring groove is machined on the top of the cover, on the top of the body, on the top of the cover and the body, and the machining form is one of the three, the number of the machined sealing ring groove is one or more than one, the number of the installed sealing ring is the same as the number of the machined sealing ring groove, and the type is matched, the cover and the body are fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0014] In some embodiments of the present application, a seat is added between the cover and the body, the sealing ring groove is machined on the top of the seat, on the top of the cover and the seat, on the top of the seat and the body, on the top of the cover, the seat and the body, and the machining form is one of the five, the number of the machined sealing ring groove is one or more than one, the number of the installed sealing ring is the same as the number of the machined sealing ring groove, and the type is matched, the cover, the seat and the body are fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0015] In some embodiments of the present application, the sealing ring groove is machined on the top of the I-type sealing ring groove seat, the number of the machined sealing ring groove is one or more than one, the number of the installed sealing ring is the same as the number of the machined sealing ring groove, and the type is matched, the I-type sealing ring groove seat and the body are fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip, the cover and the body are fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0016] In some embodiments of the present application, a II-type sealing ring groove seat is added between the cover and the body, the sealing ring groove is machined on the top of the II-type sealing ring groove seat, the number of the machined sealing ring groove is one or more than one, the number of the installed sealing ring is the same as the number of the machined sealing ring groove, and the type is matched, the cover, the II-type sealing ring groove seat and the body are fixedly connected into a whole by screws, and the sealing is sealed by a sealing strip.

[0017] In some embodiments of the present application, the upper or lower sealing groove has a stopper, the plane of the sealing groove is parallel to the plane of the sealing groove, and the center line position is the same. The upper outward extending portion of the piston or the lower end surface of the piston is sealed with the stopper after the piston moves downward, and the lower extending end surface of the piston is sealed with the stopper. The upper outward extending portion of the piston has a II sealing surface, the lower end surface of the piston has a III sealing surface, the cover, the seat and the body are fixedly connected as a whole by screws, and the sealing is sealed by a sealing strip.

[0018] In some embodiments of the present application, the cover, the seat and the body are increased, and a stopper is arranged on the seat. The plane of the sealing groove is parallel to the plane of the sealing groove, and the center line position is the same. The upper outward extending portion of the piston or the lower end surface of the piston is sealed with the stopper after the piston moves downward, and the lower extending end surface of the piston is sealed with the stopper. The upper outward extending portion of the piston has a II sealing surface, the lower end surface of the piston has a III sealing surface, the cover, the seat and the body are fixedly connected as a whole by screws, and the sealing is sealed by a sealing strip.

[0019] In some embodiments of the present application, an axle is arranged on the cover and extends into the inner cavity of the piston. The axle is sealed between the contact position of the cover and the axle. The axle can be moved up and down by rotating a hand wheel.

[0020] In some embodiments of the present application, the inner cavity of the piston and the inner cavity of the body, and the inner cavity of the piston and the inner cavity of the body are connected through a pipeline with a valve or directly through a pipeline. Preferably, the valve is installed with an electric actuator, and the electric actuator is used to replace the manual switch valve.

[0021] The inner cavity of the piston and the inner cavity of the body, and the inner cavity of the body are connected through a pipeline with a valve or a pilot valve.

[0022] The inner cavity of the piston and the inner cavity of the body, and the inner cavity of the body are connected through a pipeline with a valve or a pilot valve. The Z-shaped liquid control valve with a piston, an axle sleeve and a spring can meet different working conditions. The pipeline connection, valve connection and pilot valve connection of the present application have the following nine connection forms, but the pipeline connection, valve connection and pilot valve connection of the present application are not limited to the nine connection forms. According to the needs of the working conditions, the pipeline connection, valve connection and pilot valve connection between the inner cavity of the piston and the inner cavity of the body can be changed to meet the needs of the working conditions, and the corresponding changes of the pipeline connection, valve connection and pilot valve connection are also within the protection scope of the present application.

[0023] The piston inner cavity is connected with the body inlet end inner cavity and the body outlet end inner cavity via a pipe connection, a valve connection, and a pilot valve connection form 2:

[0024] The manufacturing structure of the present application can be used to form a Z-shaped liquid control valve with a piston inner cavity connected with the body inlet end inner cavity and the body outlet end inner cavity via a pipe connection, a valve connection, and a pilot valve connection form 2.

[0025] In some embodiments of the present application, the piston inner cavity is connected with the three-way valve via pipe I, one outlet of the three-way valve is connected with the body inlet end inner cavity via pipe I and / or a check valve, and the other outlet of the three-way valve is connected with the body outlet end inner cavity via pipe I.

[0026] In some embodiments of the present application, the piston inner cavity is connected with the body inlet end inner cavity via pipe I and inlet end two-way valve I, and the piston inner cavity is connected with the body outlet end inner cavity via pipe I and outlet end two-way valve II.

[0027] In some embodiments of the present application, the piston inner cavity is connected with the body inlet end inner cavity via pipe I, inlet end two-way valve I, and a half-closed check valve, and the piston inner cavity is connected with the body outlet end inner cavity via pipe I, outlet end two-way valve II, and a half-closed check valve.

[0028] In some embodiments of the present application, the piston inner cavity is connected with a three-way I via two-way valve IV, both outlets of the three-way I are provided with a check valve, one outlet of one check valve is connected with the body inlet end inner cavity via pipe I, and the other outlet of the other check valve is connected with the body outlet end inner cavity via pipe I; the piston inner cavity is connected with a three-way II via two-way valve V, both outlets of the three-way II are provided with a check valve, one outlet of one check valve is connected with the body inlet end inner cavity via pipe I, and the other outlet of the other check valve is connected with the body outlet end inner cavity via pipe I.

[0029] In some embodiments of the present application, the piston inner cavity is connected with the body inlet end inner cavity via pipe I and inlet end two-way valve I, the piston inner cavity is connected with a float ball valve via outlet end two-way valve II and pipe I, and the body outlet end inner cavity is flange-connected with pipe II to a liquid pool.

[0030] In some embodiments of the present application, the piston inner cavity is connected to one outlet of a three-way valve I through a pipe I, another outlet of the three-way valve I is connected to the liquid inlet end of the pump through a pipe I, the inlet of the three-way valve I is connected to the body inlet inner cavity through a pipe I and an inlet two-way valve I, and the piston inner cavity is connected to the body outlet inner cavity through a pipe I and an outlet two-way valve II.

[0031] In some embodiments of the present application, the piston inner cavity is connected to one inlet of a two-way valve through a pipe I, the outlet of the two-way valve is connected to the body outlet inner cavity through an outlet two-way valve II and a pipe I, the piston inner cavity is connected to the body inlet inner cavity through an inlet two-way valve I and a pipe I, and the top of the two-way valve has a screw rod.

[0032] In some embodiments of the present application, the piston inner cavity is connected to one outlet of a three-way valve II through a pipe I, another outlet of the three-way valve II is connected to the body outlet inner cavity through an outlet two-way valve II and a pipe I, the body inlet inner cavity is connected to the inlet of the three-way valve II through an inlet two-way valve I and a pipe I, the piston inner cavity is connected to the body outlet inner cavity through a two-way valve III and a pipe I, and the top of the three-way valve II has a screw rod.

[0033] The Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring can be assembled on site by using the Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring.

[0034] The Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring can be assembled on site by using the Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring.

[0035] The Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring can be assembled on site by using the Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring.

[0036] The Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring can be assembled on site by using the Z-shaped liquid control valve without a diaphragm, a shaft and a sleeve spring.

[0037] The Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring can control the liquid flow in one direction or in two directions, and can be used in dynamic or static state, so it can be used in many valves such as gate valve, butterfly valve, stop valve, flow limiting valve, check valve, float valve, pressure reducing valve, pressure relief valve and electric valve, and can be easily controlled intelligently. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is the basic structure diagram of the first Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring; wherein a) is the front view of the body, b) is the front view of the cover and the groove, c) is the front view of the piston and the extension end, d) is the front view of the sealing ring and its local enlarged view, and e) is the front view of the valve.

[0039] Figure 2 is the basic structure diagram of the second Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring; wherein a) is the front view of the body and the local enlarged view of the groove, b) is the front view of the cover, c) is the front view of the piston and the extension end, d) is the front view of the sealing ring and its local enlarged view, and e) is the front view of the valve.

[0040] Figure 3 is the basic structure diagram of the third Z-shaped liquid control valve without diaphragm, shaft, sleeve and 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 piston and the extension end, d) is the front view of the valve, the sealing ring and the local enlarged view of the groove.

[0041] Figure 4 is the basic structure diagram of the fourth Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring, and the front view of the valve.

[0042] Figure 5 is the basic structure diagram of the fifth Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring; wherein a) is the front view of the body, b) is the front view of the cover and the concave groove, c) is the front view of the piston, the extension end and the U-shaped piston, d) is the front view of the V-shaped sealing ring and its local enlarged view, and e) is the front view of the valve.

[0043] Figure 6 is the basic structure diagram of the sixth Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring; wherein a) is the front view of the body and the local enlarged view of the concave groove, b) is the front view of the cover, c) is the front view of the piston, the extension end and the U-shaped piston, d) is the front view of the sealing ring and its local enlarged view, and e) is the front view of the valve.

[0044] Figure 7 is the basic structure diagram of the seventh kind of Z type liquid control valve without diaphragm, shaft, sleeve spring; the valve embodiment and the local enlarged view of the concave groove.

[0045] Figure 8 is the basic structure diagram of the eighth kind of Z type liquid control valve without diaphragm, shaft, sleeve spring; the valve embodiment and the local enlarged view of the sealing ring expansion port.

[0046] Figure 9 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the ninth kind of Z type liquid control valve without diaphragm, shaft, sleeve spring; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the piston and the extended end surface as a whole and the U type piston, d) the sealing ring and the local enlarged front view, e) the front view of the valve embodiment and the local enlarged view of the concave groove.

[0047] Figure 10 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the tenth kind of Z type liquid control valve without diaphragm, shaft, sleeve spring; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the piston and the extended end surface as a whole and the U type piston, d) the sealing ring and the local enlarged front view, e) the front view of the valve embodiment and the local enlarged view of the concave groove.

[0048] Figure 11 is the sealing ring groove processing structure and the sealing ring assembly structure of the eleventh kind of Z type liquid control valve without diaphragm, shaft, sleeve spring; wherein a) the front view of the body, b) the front view of the cover, c) the front view of the piston and the extended end surface as a whole and the U type piston, d) the sealing ring and the local enlarged front view, e) the front view of the valve embodiment and the local enlarged view of the concave groove.

[0049] Figure 12 is the sealing ring groove processing structure and the sealing ring assembly structure diagram of the twelfth kind of Z type liquid control valve without diaphragm, shaft, sleeve spring; a) the front view of the body, b) the front view of the cover, c) the front view of the piston and the extended end surface as a whole and the U type piston, d) the front view of the seat, e) the sealing ring and the local enlarged front view, f) the front view of the valve embodiment and the local enlarged view of the concave groove.

[0050] Figure 13Figure 1 is a schematic diagram of the sealing ring groove processing structure and sealing ring assembly structure of a first Z-type liquid control valve without diaphragm shaft sleeve spring; a) is a front view of the body, b) is a front view of the cover, c) is a front view of the piston and the extension end surface as a whole and the U-shaped piston, d) is a front view of the seat, e) is a front view of the sealing ring and its local enlarged view, f) is a front view of the valve embodiment and a concave groove local enlarged view schematic diagram.

[0051] Figure 14 Figure 2 is a schematic diagram of the sealing ring groove processing structure and sealing ring assembly structure of a second Z-type liquid control valve without diaphragm shaft sleeve spring; a) is a front view of the body, b) is a front view of the cover, c) is a front view of the piston and the extension end surface as a whole and the U-shaped piston, d) is a front view of the seat, e) is a front view of the sealing ring and its local enlarged view, f) is a front view of the valve embodiment and a concave groove local enlarged view schematic diagram.

[0052] Figure 15 Figure 3 is a schematic diagram of the sealing ring groove processing structure and sealing ring assembly structure of a third Z-type liquid control valve without diaphragm shaft sleeve spring; a) is a front view of the body, b) is a front view of the cover, c) is a front view of the piston and the extension end surface as a whole and the U-shaped piston, d) is a front view of the seat, e) is a front view of the sealing ring and its local enlarged view, f) is a front view of the valve embodiment and a concave groove local enlarged view schematic diagram.

[0053] Figure 16 Figure 4 is a schematic diagram of the sealing ring groove processing structure and sealing ring assembly structure of a fourth Z-type liquid control valve without diaphragm shaft sleeve spring; a) is a front view of the body, b) is a front view of the cover, c) is a front view of the piston and the extension end surface as a whole and the U-shaped piston, d) is a front view of the seat, e) is a front view of the sealing ring and its local enlarged view, f) is a front view of the valve embodiment and a concave groove local enlarged view schematic diagram.

[0054] Figure 17 Figure 5 is a schematic diagram of the sealing ring groove processing structure and sealing ring assembly structure of a fifth Z-type liquid control valve without diaphragm shaft sleeve spring; a) is a front view of the body, b) is a front view of the cover, c) is a front view of the piston and the extension end surface as a whole and the U-shaped piston, d) is a front view of the seat, e) is a front view of the sealing ring and its local enlarged view, f) is a front view of the valve embodiment and a concave groove local enlarged view schematic diagram.

[0055] Figure 18is the eighteenth sealing ring groove processing structure and sealing ring assembly structure of Z type liquid control valve of membraneless shaft sleeve spring; a) body of the positive cross-sectional view, b) cover of the positive cross-sectional view, c) piston and extension end face whole and U type piston of the positive cross-sectional view, d) seat of the positive cross-sectional view, e) sealing ring and its local enlarged positive cross-sectional view, f) positive cross-sectional view and concave groove local enlarged view schematic diagram of valve embodiment.

[0056] Figure 19 is a kind of double stop valve structure schematic diagram of Z type liquid control valve of membraneless shaft sleeve spring basic structure; a) body of the positive cross-sectional view, b) cover of the positive cross-sectional view, c) piston and extension end face whole and U type piston of the positive cross-sectional view, d) sealing ring and its local enlarged positive cross-sectional view, e) positive cross-sectional view and concave groove, sealing ring, upper stop local enlarged view schematic diagram of valve embodiment.

[0057] Figure 20 is a kind of double stop valve structure schematic diagram of Z type liquid control valve of membraneless shaft sleeve spring basic structure; a) body of the positive cross-sectional view, b) cover of the positive cross-sectional view, c) piston and extension end face whole and U type piston of the positive cross-sectional view, d) sealing ring and its local enlarged positive cross-sectional view, e) positive cross-sectional view and concave groove, sealing ring, upper stop local enlarged view schematic diagram of valve embodiment.

[0058] Figure 21 is another double stop valve structure schematic diagram of Z type liquid control valve of membraneless shaft sleeve spring basic structure; a) body of the positive cross-sectional view, b) cover of the positive cross-sectional view, c) piston and extension end face whole and U type piston of the positive cross-sectional view, d) seat of the positive cross-sectional view, e) sealing ring and its local enlarged positive cross-sectional view, f) positive cross-sectional view and concave groove, sealing ring, upper stop local enlarged view schematic diagram of valve embodiment.

[0059] Figure 22 is another double stop valve structure schematic diagram of Z type liquid control valve of membraneless shaft sleeve spring basic structure; a) body of the positive cross-sectional view, b) cover of the positive cross-sectional view, c) piston and extension end face whole and U type piston of the positive cross-sectional view, d) seat of the positive cross-sectional view, e) sealing ring and its local enlarged positive cross-sectional view, f) positive cross-sectional view and concave groove, sealing ring, upper stop local enlarged view schematic diagram of valve embodiment.

[0060] Figure 23 is the principle diagram of Z type liquid control valve of membraneless shaft sleeve spring basic structure flow limiting valve structure.

[0061] Figure 24 is another principle diagram of Z type liquid control valve of membraneless shaft sleeve spring basic structure flow limiting valve structure.

[0062] Figure 25Is a kind of basic structure of Z type liquid control valve of diaphragmless shaft sleeve spring of principle diagram of electric valve structure.

[0063] Figure 26 Is another basic structure of Z type liquid control valve of diaphragmless shaft sleeve spring of principle diagram of electric valve structure.

[0064] Figure 27 Is a kind of principle diagram of one-way single intercept valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0065] Figure 28 Is a kind of principle diagram of one-way double intercept valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0066] Figure 29 Is a kind of principle diagram of check valve and intercept valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0067] Figure 30 Is a kind of principle diagram of two-way single intercept valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0068] Figure 31 Is a kind of principle diagram of two-way double intercept valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0069] Figure 32 Is a kind of principle diagram of valve float ball valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0070] Figure 33 Is a kind of principle diagram of flow limiting valve and check valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0071] Figure 34 Is a kind of principle diagram of pressure reducing and stabilizing valve of Z type liquid control valve of diaphragmless shaft sleeve spring.

[0072] Figure 35 Is a kind of principle diagram of pressure relief valve of Z type liquid control valve of diaphragmless shaft sleeve spring. BRIEF DESCRIPTION OF DRAWINGS

[0074] 1, cover; 2, seat; 3, body; 4, sealing ring groove; 5, sealing ring; 6, piston; 7, piston inner cavity; 8, body outlet end inner cavity; 9, outer ring of sealing ring; 10, inner ring of sealing ring; 11, outer ring of piston; 12, body inlet end inner cavity; 13, lower extension end surface of piston; 14, body outlet end inner cavity stop; 15, pipeline I; 16, valve I; 17, three-way valve; 18, check valve; 19, inlet two-way valve I; 20, outlet two-way valve II; 21, three-way valve I; 22, three-way valve II; 23, ball float valve; 24, body outlet end inner cavity flange; 25, pipeline II; 26, liquid pool; 27, three-way pilot valve I; 28, liquid inlet end; 29, hand wheel; 30, two-way pilot valve; 31, screw rod; 32, three-way pilot valve II; 33, two-way valve III; 34, semi-closed check valve; 35, pump; 36, two-way valve IV; 37, two-way valve V; 38, sealing surface I; 39, screw; 40, cut-off port; 41, upward outward extension part; 42, lower end surface; 43, electric valve; 44, shaft rod; 45, rotating hand wheel; 46, first sealing ring groove seat; 47, second sealing ring groove seat; 48, sealing ring expansion port; 49, concave shape; 50, V shape; 51, piston inner diameter port; 52, sealing strip; 53, sealing surface II; 54, sealing surface III; 55, screw; 56, U shape; 57, valve II. DETAILED DESCRIPTION

[0075] The application will be described in detail below with reference to the drawings and embodiments. It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words “up”, “down”, “left”, “right” appear in the following text, they only mean the up, down, left and right directions consistent with the drawings themselves, and do not limit the structure.

[0076] Embodiment 1

[0077] As Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the diaphragmless shaft sleeve spring Z-type liquid control valve of the present application comprises a cover 1, a body 3, a sealing ring groove 4, a sealing ring 5, a piston 6, an extended end surface 13 below the piston, a body outlet end cavity stop 14. The sealing ring groove 4 is on the top of the cover 1, on the top of the body 3, on the top of the cover 1 and the body 3, the sealing ring 5 is installed in the sealing ring groove 4, the piston 6 is placed in the sealing ring 5, the piston 6 and the extended end surface 13 below the piston are an integral whole, the cover 1 and the body 3 are sealed and an integral whole, the piston cavity 7 and the body outlet end cavity 8 are sealed, the outer ring 9 of the sealing ring is sealed with the sealing ring groove 4 and the inner ring 10 of the sealing ring is sealed and slidingly sealed with the piston outer ring 11, the body inlet end cavity 12 and the body outlet end cavity 8 are sealed, the extended end surface 13 below the piston is sealed with the body outlet end cavity stop 14 after the piston 6 moves, the piston cavity 7 is connected with the body inlet end cavity 12 and the body outlet end cavity 8 through a pipe connection, a valve connection or a pilot valve connection.

[0078] Example 2

[0079] In the above-mentioned diaphragmless shaft sleeve spring Z-type liquid control valve, as Figure 5 、 Figure 6 、 Figure 7 、 Figure 8As shown, the plane of the sealing ring groove 4 is circular, the cross-sectional structure is concave 49, the plane of the sealing ring 5 is circular, the cross-sectional shape is V-shaped 50, the plane of the piston 6 is circular, the cross-sectional shape is U-shaped 56, the plane of the out-end inner cavity stop 14 is circular, the inner diameter of the out-end inner cavity stop 14 is smaller than the outer diameter of the piston 6, the circle plane of the sealing ring groove 4 is parallel to the circle plane of the body out-end inner cavity stop 14, and the center line positions are the same, the center line position of the circle plane of the sealing ring groove 4 is perpendicular to the center line position of the piston 6 placed in the sealing ring 5, the outer circle 11 of the piston 6 placed in the sealing ring 5 needs to be in contact with the inner circle 10 of the sealing ring, the direction of the piston inner diameter port 51 of the piston 6 placed in the sealing ring 5 is towards the piston inner cavity 7 or the opposite direction of the piston inner cavity 7, the piston 6 is vertically connected and fixed with the lower extension end surface 13 to form an integral whole, the lower extension end surface 13 has a sealing surface I 38, the outer circle 9 of the sealing ring has elasticity to keep in contact with the sealing ring groove 4 for sealing, the inner circle 10 of the sealing ring has elasticity to keep in contact with the piston outer circle 11 for sealing and sliding, the outer circle 9 and the inner circle 10 of the sealing ring have elasticity to keep in contact, once the direction of the sealing ring expansion port 48 is pressed by liquid, the sealing ring 4 will expand and contract with the increase and decrease of the liquid pressure, if the opposite direction of the sealing ring expansion port 48 is pressed by liquid, the sealing ring 4 will not expand and contract with the increase and decrease of the liquid pressure, the sealing ring 5 is installed in the sealing ring groove 4, the direction of the sealing ring expansion port 48 is towards the piston inner cavity 7 or the opposite direction of the piston inner cavity 7, the cover 1 and the body 3 are sealingly connected and fixed to form an integral whole, the piston inner cavity 7 is connected with the body in-end inner cavity 12 and the body out-end inner cavity 8 through pipelines, valves and pilot valves.

[0080] Specifically, the structure of the Z-shaped liquid control valve without diaphragm, shaft, sleeve and spring can make the valve not need to be installed with diaphragm, shaft, sleeve and spring, liquid can pass through the valve in two directions, and the valve can close the liquid in two directions.

[0081] The working principle is shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 .

[0082] 1. The piston inner cavity 7, the body inlet inner cavity 12, the body outlet inner cavity 8 are connected through the pipe 115, the valve 116, the valve 157, when the liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, the valve 116 on the side of the body inlet inner cavity 12 is closed, the valve 157 on the side of the body outlet inner cavity 8 is opened, the liquid in the body inlet inner cavity 12 cannot enter the piston inner cavity 7, the piston lower extension end surface 13 is pushed by the liquid in the body inlet inner cavity 12 and leaves the body outlet inner cavity stop 14, the liquid in the body inlet inner cavity 12 enters the body outlet inner cavity 8 through the body outlet inner cavity stop 14, because the piston inner cavity 7 and the body outlet inner cavity 8 are connected, the liquid pressure in the piston inner cavity 7 and the body outlet inner cavity 8 is the same, the liquid in the body inlet inner cavity 12 can enter the body outlet inner cavity 8 through the body outlet inner cavity stop 14 only depending on the weight of the piston 6 and the piston lower extension end surface 13 vertically fixed connection as a whole and the resistance brought by the friction of the elastic inner ring 10 of the sealing ring 5 keeping contact sealing and sliding contact sealing with the piston outer ring 11, because the elastic inner ring 10 of the sealing ring 5 has very small elasticity to keep contact sealing with the piston outer ring 11 when it is not pressed by the liquid, the resistance brought by the friction is also small, as long as the liquid in the body inlet inner cavity 12 can overcome the pressure loss of the weight of the piston 6 and the piston lower extension end surface 13 vertically fixed connection as a whole and the resistance brought by the friction of the elastic inner ring 10 of the sealing ring 5 keeping contact sealing and sliding contact sealing with the piston outer ring 11, the liquid in the body inlet inner cavity 12 can flow to the body outlet inner cavity 8, so the pressure loss of the liquid flowing into the body outlet inner cavity 8 through the body outlet inner cavity stop 14 is very small, the starting pressure of the Z-shaped liquid control valve with the piston, the shaft, the sleeve and the spring without the diaphragm is very small, and the working condition range of the Z-shaped liquid control valve with the piston, the shaft, the sleeve and the spring without the diaphragm is large.

[0083] 2. The piston inner cavity 7, the body inlet end inner cavity 12, the body outlet end inner cavity 8 are connected via the pipe I 15, the valve I 16, the valve II 57, when the liquid flows from the body inlet end inner cavity 12 to the body outlet end inner cavity 8, open the valve I 16 on the side of the body inlet end inner cavity 12, close the valve II 57 on the side of the body outlet end inner cavity 8, the liquid in the body inlet end inner cavity 12 enters the piston inner cavity 7, because the piston inner cavity 7 and the body outlet end inner cavity 8 are not connected, the pressure of the liquid in the piston inner cavity 7 and the body inlet end inner cavity 12 is the same, because the pressure of the liquid entering the body outlet end inner cavity 8 is the pressure of the liquid in the body inlet end inner cavity 12, it can only enter the body outlet end inner cavity 8 by overcoming the resistance of the friction between the piston 6 and the sealing ring inner ring 10 which has elasticity to keep sliding contact with the piston outer ring 11, therefore, there is a very small pressure difference between the liquid in the body inlet end inner cavity 12 and the liquid in the body outlet end inner cavity 8, because the elasticity of the sealing ring inner ring 10 which has elasticity to keep contact with the piston outer ring 11 is very small, the friction of the sliding contact between the piston outer ring 11 is also small, the sealing ring outer ring 11 and the sealing ring inner ring 10 have elasticity, therefore, the liquid will not leak into the body outlet end inner cavity 8, because the area of the piston outer ring 11 is larger than the area of the body outlet end inner cavity stop 14, therefore, the piston 6 will move downward after being pressed, the distance between the piston lower extension end surface 13 and the body outlet end inner cavity stop 14 will gradually approach when the piston 6 moves downward, the pressure difference between the body inlet end inner cavity 12 and the body outlet end inner cavity 8 will gradually increase, in the process of gradually increasing the liquid pressure, the direction of the sealing ring inflation hole 48 is pressed by the liquid, the sealing ring 5 will expand with the increase of the liquid pressure, at this time, the sealing ring 5 tends to be in an expanded state in the sealing ring groove 4, a ring-shaped force will be formed between the sealing ring groove 4 and the sealing ring 5 after the sealing ring 5 expands, which makes the piston 6 and the flat surface of the sealing ring groove 4 tend to be perpendicular, and the piston lower extension end surface 13 and the body outlet end inner cavity stop 14 remain in a parallel position; the piston 6 continues to move downward, because of the expansion of the sealing ring 5, the friction resistance between the sealing ring inner ring 10 and the piston outer ring 11 will become larger and larger, which will ensure that the piston lower extension end surface 13 will not shake when the distance between the piston 6 and the body outlet end inner cavity stop 14 approaches, and the valve will achieve a parallel and non-shaking sealing fit between the piston lower extension end surface 13 and the body outlet end inner cavity stop 14, therefore, the Z-shaped liquid control valve without a diaphragm shaft sleeve spring does not use a spring to reset and increase the stability when the valve is closed, and a diaphragm shaft sleeve is not used to ensure that the piston lower extension end surface 13 and the body outlet end inner cavity stop 14 are parallel and sealingly fit.

[0084] 3. The piston inner cavity 7, the body inlet inner cavity 12, the body outlet inner cavity 8 are connected through the pipe I 15, the valve I 16, the valve II 57, when the liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, open the valve I 16 on the side of the body inlet inner cavity 12, close the valve II 57 on the side of the body outlet inner cavity 8, the liquid in the body outlet inner cavity 8 cannot enter the piston inner cavity 7, but the liquid in the piston inner cavity 7 can flow into the body inlet inner cavity 12 through the pipe I 15, the valve I 16 on the side of the body inlet inner cavity 12, at this time the liquid pressure in the piston inner cavity 7 is the same as the liquid pressure in the body inlet inner cavity 12, as the outer ring area of the piston 6 is larger than the inner ring area of the body outlet inner cavity stop 14, as long as the liquid pressure in the body outlet inner cavity 8 is greater than the liquid pressure in the body inlet inner cavity 12, it can overcome the resistance between the vertical fixed connection of the piston 6 and the piston lower extension end surface 13 and the elastic retention of the inner ring 10 of the sealing ring with the sliding contact sealing of the piston outer ring 11, the piston 6 will be pushed upward by the liquid in the body outlet inner cavity 8, the piston lower extension end surface 13 will move away from the body outlet inner cavity stop 14 when the piston 6 moves upward, the liquid in the body outlet inner cavity 8 will flow to the body inlet inner cavity 12 through the body outlet inner cavity stop 14, the valve is opened; during the opening of the valve, the pressure difference between the liquid pressure in the body outlet inner cavity 8 and the liquid pressure in the body inlet inner cavity 12 will become closer and closer, the sealing ring expansion port 48 will stretch and contract as the liquid pressure on the sealing ring 4 decreases, when the piston 6 moves to the size of the resistance between the vertical fixed connection of the piston 6 and the piston lower extension end surface 13 and the elastic retention of the inner ring 10 of the sealing ring with the sliding contact sealing of the piston outer ring 11, the piston 6 will no longer move 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 vertical fixed connection of the piston 6 and the piston lower extension end surface 13 and the elastic retention of the inner ring 10 of the sealing ring with the sliding contact sealing of the piston outer ring 11, therefore, the valve can realize the flow from the body outlet inner cavity 8 to the body inlet inner cavity 12, and the pressure loss of the liquid flowing from the body outlet inner cavity 8 to the body inlet inner cavity 12 is also small, so that the membrane-free shaft sleeve spring Z-shaped liquid control valve realizes bidirectional flow under the condition of small pressure loss.

[0085] 4. The piston inner cavity 7, body inlet end inner cavity 12, body outlet end inner cavity 8 are connected via pipe I 15, valve I 16, valve II 57, when the liquid flows from the body outlet end inner cavity 8 to the body inlet end inner cavity 12, close the valve I 16 on the side of the body inlet end inner cavity 12, open the valve II 57 on the side of the body outlet end inner cavity 8, the liquid in the body outlet end inner cavity 8 enters the piston inner cavity 7, and the liquid in the piston inner cavity 7 cannot flow into the valve body inlet end inner cavity 12 through the pipe I 15, the valve I 16 on the side of the inlet end inner cavity 12, at this time the liquid pressure in the piston inner cavity 7 is the same as the liquid pressure in the body outlet end inner cavity 8, as long as the overall weight of the vertically fixed connection between the piston 6 and the lower extension end surface 13 of the piston can overcome the resistance brought by the elastic inner ring 10 of the sealing ring 5 keeping in contact with the piston outer ring 11, the piston 6 can move downward, because the elastic inner ring 10 of the sealing ring 5 has very small elasticity in keeping in contact with the piston outer ring 11 when it is not pressed by the liquid, the resistance brought by the friction is also small, the piston 6 will move downward under the action of its own weight, the lower extension end surface 13 of the piston will match and seal with the body outlet end inner cavity stop 14 after the piston 6 moves downward, cutting off the liquid flow from the valve body outlet end inner cavity 8 to the body inlet end inner cavity 12, the valve is closed, realizing the bidirectional closing of the Z-shaped liquid control valve without membrane, shaft, rod, sleeve and spring.

[0086] Example 3

[0087] In the above-mentioned Z-shaped liquid control valve without membrane, shaft, rod, sleeve and spring, the sealing ring groove 4 is machined on the upper surface of the cover 1, on the upper surface of the body 3, on the upper surfaces of the cover 1 and the body 3, or on the upper surfaces of the cover 1, the seat 2 and the body 3, and the machining form is one of the five forms, the number of the machined sealing ring grooves 4 is one or more than one, and the number of the installed sealing rings 5 is the same as the number of the machined sealing ring grooves 4 and the type is matched, the sealing connection between the cover 1, the seat 2 and the body 3 is fixedly connected into a whole by the screws 39, and the sealing is sealed by the sealing strips 52, as shown in Figure 9 Figure 10 Figure 11

[0088] Example 4

[0089] In the above-mentioned Z-shaped liquid control valve without membrane, shaft, rod, sleeve and spring, the sealing ring groove 4 is machined on the upper surface of the cover 1, on the upper surface of the body 3, on the upper surfaces of the cover 1 and the body 3, or on the upper surfaces of the cover 1, the seat 2 and the body 3, and the machining form is one of the five forms, the number of the machined sealing ring grooves 4 is one or more than one, and the number of the installed sealing rings 5 is the same as the number of the machined sealing ring grooves 4 and the type is matched, the sealing connection between the cover 1, the seat 2 and the body 3 is fixedly connected into a whole by the screws 39, and the sealing is sealed by the sealing strips 52, as shown in Figure 12 Figure 13 Figure 14 Figure 15 ​​​​​​, Figure 16 As shown in the figure.

[0090] Example 5

[0091] In the above-mentioned Z-shaped liquid control valve without diaphragm shaft sleeve spring, the sealing ring groove 4 is machined on the type I sealing ring groove seat 46, and the number of machined sealing ring grooves 4 is one or more than one. The number of installed sealing rings 5 is the same as the number of machined sealing ring grooves 4, and the type is matched. The type I sealing ring groove seat 46 is fixedly connected with the body 3 by screws 55 to form an integral whole, and the sealing is sealed by a sealing strip 52. The cover 1 and the body 3 are fixedly connected by screws 39 to form an integral whole, and the sealing is sealed by a sealing strip 52, as shown in the figure. Figure 17 As shown in the figure.

[0092] Example 6

[0093] In the above-mentioned Z-shaped liquid control valve without diaphragm shaft sleeve spring, the cover 1 and the body 3 are increased with type II sealing ring groove seat 47. The sealing ring groove 4 is machined on the type II sealing ring groove seat 47, and the number of machined sealing ring grooves 4 is one or more than one. The number of installed sealing rings 5 is the same as the number of machined sealing ring grooves 4, and the type is matched. The cover 1, the type II sealing ring groove seat 47, and the body 3 are fixedly connected by screws 39 to form an integral whole, and the sealing is sealed by a sealing strip 52, as shown in the figure. Figure 18 As shown in the figure.

[0094] Example 7

[0095] In the above-mentioned Z-shaped liquid control valve without diaphragm shaft sleeve spring, the sealing ring groove 4 has one stop port 40 above or below. The ring plane of the stop port 40 is parallel to the ring plane of the sealing ring groove 4, and the center line positions are the same. The upwardly extending portion 41 of the piston 6 or the lower end face 42 of the piston 6 is sealed with the stop port 40 after the downward movement of the piston 6, and the lower extending end face 13 of the piston is sealed with the body outlet end inner cavity stop port 14. The upwardly extending portion 41 of the piston 6 has a sealing surface II 53, and the lower end face 42 of the piston 6 has a sealing surface III 54. The cover 1 and the body 3 are fixedly connected by screws 39 to form an integral whole, and the sealing is sealed by a sealing strip 52, as shown in the figure. Figure 19 As shown in the figure. Figure 20 As shown in the figure.

[0096] Example 8

[0097] The Z-shaped liquid control valve without diaphragm, shaft and sleeve spring, wherein a seat 2 is arranged between the cover 1 and the body 3, and a cut-off port 40 is arranged on the seat 2, the circle plane of the cut-off port 40 is parallel to the circle plane of the sealing ring groove 4, and the center line position is the same, the upper outward extending part 41 of the piston 6 or the lower end surface 42 of the piston 6 is sealed with the cut-off port 40 after the piston 6 moves downward, and the lower extending end surface 13 of the piston 6 is sealed with the body outlet inner cavity cut-off port 14, the upper outward extending part 41 of the piston 6 has a sealing surface II 53, the lower end surface 42 of the piston 6 has a sealing surface III 54, the cover 1, the seat 2 and the body 3 are fixedly connected into an integral whole by screws 39, and the sealing is achieved by a sealing strip 52, as shown in Figure 21 、 Figure 22

[0098] Example 9

[0099] The Z-shaped liquid control valve without diaphragm, shaft and sleeve spring, wherein a shaft 44 is arranged on the cover 1 and extends into the piston inner cavity 7, the shaft 44 is sealed between the contact position with the cover 1, and the shaft 44 can be moved up and down by rotating a hand wheel 45. As shown in Figure 23 、 Figure 24

[0100] Further specific description of example 1, example 2, example 3, example 4, example 5, example 6, example 7, example 8 and example 9:

[0101] Specific description 1

[0102] In the Z-shaped liquid control valve without diaphragm, shaft and sleeve spring, when the sealing ring 5 is installed, the sealing ring 5 is installed according to the direction requirement of liquid flow, the sealing ring expansion port 48 is installed towards the piston inner cavity 7 when the working condition requires the liquid to flow from the body inlet inner cavity 12 to the body outlet inner cavity 8, the sealing ring expansion port 48 is installed in the opposite direction of the piston inner cavity 7 when the working condition requires the liquid to flow from the body outlet inner cavity 8 to the body inlet inner cavity 12, the sealing ring 5 towards the piston inner cavity 7 needs two sealing ring expansion ports 48 when the working condition requires the liquid to flow in two directions, the number of sealing ring 5 is one or more than one when the working condition requires the Z-shaped liquid control valve without diaphragm, shaft and sleeve spring to be opened and closed in one direction, the number of sealing ring 5 is two or more than two when the working condition requires the Z-shaped liquid control valve without diaphragm, shaft and sleeve spring to be opened and closed in two directions, and the Z-shaped liquid control valve without diaphragm, shaft and sleeve spring can meet the requirements of various working conditions through different machining structures of the sealing ring groove 4 and different assembly forms of the sealing ring 5.

[0103] Specific description 2:

[0104] ​​The piston 6 and the lower extension end surface 13 are fixed integrally in vertical connection, and the direction of the piston inner diameter port 51 of the piston 6 can be connected and fixed towards the piston inner cavity 7 or in the opposite direction of the piston inner cavity 7, which can meet the needs of the Z-shaped liquid control valve of the membraneless shaft sleeve spring for working conditions.

[0105] Specific description 3:

[0106] In the above-mentioned Z-shaped liquid control valve of the membraneless shaft sleeve spring, the structure forms of Figure 17 、 Figure 18 can make the sealing ring seat and the piston be replaced in a set, and when the piston and the sealing ring seat are damaged, other components of the Z-shaped liquid control valve of the membraneless shaft sleeve spring do not need to be replaced. Due to the unique manufacturing and assembly method, maintenance is extremely convenient, and professional technical personnel are not needed for replacement, so the service life of the Z-shaped liquid control valve of the membraneless shaft sleeve spring can be basically the same as that of the pipeline.

[0107] Specific description 4:

[0108] In the above-mentioned Z-shaped liquid control valve of the membraneless shaft sleeve spring, the structure forms of Figure 19 、 Figure 20 、 Figure 21 、 Figure 22 can make the sealing of the valve achieve a better sealing effect.

[0109] Working principle:

[0110] 1. As shown in Figure 19 、 Figure 21 , the liquid flows from the body inlet end cavity 12 to the body outlet end cavity 8, and the upper outward extension part 41 of the piston is sealed with the cutoff port 40 after the piston 6 moves downward, and at the same time, the lower extension end surface 13 of the piston is sealed with the body outlet end cavity cutoff port 14 to cut off the liquid flowing from the body inlet end cavity 12 to the body outlet end cavity 8, and the valve is closed; a cutoff port 40 is processed above the sealing ring groove 4, and when the lower end surface 42 of the piston is sealed with the cutoff port 40 after the piston 6 moves downward, the liquid in the piston inner cavity 7 is sealed at this position. Since it is a cutoff port sealing, the cutoff port sealing wear is extremely small, and it will be sealed better with the increase of the use time, so there will be no liquid penetration into the body outlet end cavity 8, thereby realizing the completely non-penetrating sealing of the valve.

[0111] 2. As shown in Figure 20 、 Figure 22The lower double stop valve of the Z-shaped liquid control valve without diaphragm shaft rod sleeve spring is shown. Liquid flows from the body inlet cavity 12 to the body outlet cavity 8. The lower end surface 42 of the piston 6 is sealed with the stop 40 after the piston 6 moves downward, and the lower extension surface 13 of the piston is sealed with the body outlet cavity stop 14, thereby cutting off the liquid flowing from the body inlet cavity 12 to the body outlet cavity 8, and the valve is closed. A stop 40 is processed below the sealing ring groove 4. The liquid in the piston cavity 7 is sealed at this position after the lower end surface 42 of the piston is sealed with the stop 40 after the piston 6 moves downward. The stop sealing is less worn and better sealed with time, so there is no liquid leakage into the body outlet cavity 8, thereby achieving complete non-permeable sealing of the valve.

[0112] Specific description 5:

[0113] If the flow is to be statically adjusted, the structure shown in Figure 23 , Figure 24 is preferably used.

[0114] Working principle:

[0115] The flow limiting valve of the Z-shaped liquid control valve without diaphragm shaft rod sleeve spring is shown in Figure 23 , Figure 24 . The piston 6 has two installation forms. The direction of the piston inner diameter port 51 of the piston 6 placed in the sealing ring 5 is towards the piston cavity 7 or in the opposite direction of the piston cavity 7. The shaft rod 44 can be moved up and down by rotating the hand wheel 45. The shaft rod 44 is moved to a set position, and the piston 6 is lifted and cannot be lifted again, so the lower extension surface 13 of the piston can be kept at a set fixed opening with the body outlet cavity stop 14, thereby limiting the flow through the lower extension surface 13 of the piston and the body outlet cavity stop 14, and achieving static flow limiting.

[0116] Example 10

[0117] In the Z-shaped liquid control valve without diaphragm shaft rod sleeve spring, the valve is installed with an electric actuator 43, and the installed electric actuator 43 is used to execute the opening and closing of the valve, as shown in Figure 25 , Figure 26 .

[0118] Specific description:

[0119] The electric actuator 43 is used to open and close the valve. The electric actuator 43 is used instead of manual opening and closing of the valve to achieve remote control of the Z-shaped liquid control valve without diaphragm shaft rod sleeve spring. Once the power is off, the actuator 43 can be removed and the valve can be opened and closed with ordinary tools.

[0120] Example 11

[0121] The one-way single-cut-off valve of the Z-shaped liquid control valve without diaphragm shaft sleeve spring is connected with the three-way valve 17 through the pipeline 115 of the piston inner cavity 7, one outlet of the three-way valve 17 is connected with the valve body inlet end inner cavity 12 through the pipeline 115, and the other outlet is connected with the valve body outlet end inner cavity 8, as shown in the figure. Figure 27

[0122] Specific description: the embodiment can adopt any optional basic structure in the application, machining form of the sealing ring groove, and sealing ring assembly structure to assemble pipelines and valves, as shown in the figure. Figure 27

[0123] Working principle:

[0124] 1. When the liquid flows from the valve body inlet end inner cavity 12 to the valve body outlet end inner cavity 8, the three-way ball valve 17 is switched to the position of closing the piston inner cavity 7 and the valve body inlet end inner cavity 12, and opening the piston inner cavity 7 and the valve body outlet end inner cavity 8. The liquid in the valve body inlet end inner cavity 12 cannot enter the piston inner cavity 7 through the pipeline 115 and the three-way ball valve 17, while the liquid in the piston inner cavity 7 can enter the valve body outlet end inner cavity 8 through the three-way ball valve 17 and the pipeline 115. At this time, the piston 6 is not pressed, and the lower extension end surface 13 of the piston 6 is separated from the valve body outlet end inner cavity stop 14 under the push of the liquid in the valve body inlet end inner cavity 12. The liquid in the valve body inlet end inner cavity 12 enters the valve body outlet end inner cavity 8 through the valve body outlet end inner cavity stop 14, and the valve is opened. The three-way ball valve 17 is switched to the position of opening the piston inner cavity 7 and the valve body inlet end inner cavity 12, and closing the piston inner cavity 7 and the valve body outlet end inner cavity 8. The liquid in the valve body inlet end inner cavity 12 enters the piston inner cavity 7 through the pipeline 115 and the three-way ball valve 17, while the liquid in the piston inner cavity 7 cannot enter the valve body outlet end inner cavity 8 through the three-way ball valve 17 and the pipeline 115. Because the outer ring area of the piston 6 is larger than the inner ring area of the valve body outlet end inner cavity stop 14, the piston 6 is pressed to move downward. The lower extension end surface 13 of the piston 6 is sealed and cut off the liquid flowing from the valve body inlet end inner cavity 12 to the valve body outlet end inner cavity 8 after the piston 6 moves downward, and the valve is closed.

[0125] ​​2. When liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, the three-way ball valve 17 is set to the position of closing the piston inner cavity 7 and the body inlet inner cavity 12 and opening the piston inner cavity 7 and the body outlet inner cavity 8. The liquid in the body outlet inner cavity 8 flows into the piston inner cavity 7 through the pipe I 15 and the three-way ball valve 17, while the liquid in the piston inner cavity 7 cannot flow into the valve body inlet inner cavity 12 through the three-way ball valve 17 and the pipe I 15. When the pressure of the liquid in the piston inner cavity 7 is equal to that of the liquid in the body outlet inner cavity 8, the piston 6 moves downward under the action of gravity. The lower extension end surface 13 of the piston 6 is sealed with the body outlet inner cavity stop 14 after the piston 6 moves downward, thereby cutting off the flow of the liquid from the body outlet inner cavity 8 to the body inlet inner cavity 12 and closing the valve. When the three-way ball valve 17 is set to the position of opening the piston inner cavity 7 and the body inlet inner cavity 12 and closing the piston inner cavity 7 and the body outlet inner cavity 8, the liquid in the body outlet inner cavity 8 cannot flow into the piston inner cavity 7 through the pipe I 15 and the three-way ball valve 17, while the liquid in the piston inner cavity 7 flows into the body inlet inner cavity 12 through the three-way ball valve 17 and the pipe I 15. Because the outer circle area of the piston 6 is larger than the inner circle area of the body outlet inner cavity stop 14, the piston 6 is pushed upward by the liquid in the body outlet inner cavity 8. The lower extension end surface 13 of the piston 6 moves upward and leaves the body outlet inner cavity stop 14, thereby allowing the liquid in the body outlet inner cavity 8 to flow into the body inlet inner cavity 12 through the body outlet inner cavity stop 14 and opening the valve.

[0126] 3. Specifically, when liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8 or from the body outlet inner cavity 8 to the body inlet inner cavity 12, the liquid can only flow in one direction after the three-way ball valve 17 is operated, and thus the valve has the function of one-way flow and one-way cut-off.

[0127] Example 12

[0128] The above-mentioned Z-shaped liquid control valve with a piston, a shaft, a shaft sleeve and a spring and with one-way double cut-off function is connected by the pipe I 15 between the piston inner cavity 7 and the three-way valve 17. One outlet of the three-way valve 17 is connected to the valve body inlet inner cavity 12 through the pipe I 15 and the check valve 18, and the other outlet is connected to the valve body outlet inner cavity 8 through the pipe I 15, as shown in FIG. 2. Figure 28

[0129] Specifically, the above-mentioned valve can be assembled by using any structure in the present application under the condition of following the principle of the present application, as shown in FIG. 3. Figure 28

[0130] ​​1. When liquid flows from the body inlet cavity 12 to the body outlet cavity 8, the switch position of the three-way ball valve 17 is set to close the piston cavity 7 and the body inlet cavity 12, and to open the piston cavity 7 and the body outlet cavity 8. The liquid in the body inlet cavity 12 cannot enter the piston cavity 7 through the pipe 115, the check valve 18 and the three-way ball valve 17, while the liquid in the piston cavity 7 can enter the body outlet cavity 8 through the three-way ball valve 17 and the pipe 115. At this time, the piston 6 is not under pressure, and the lower extension surface 13 of the piston 6 is separated from the body outlet cavity stop 14 under the push of the liquid in the body inlet cavity 12. The liquid in the body inlet cavity 12 enters the body outlet cavity 8 through the body outlet cavity stop 14, and the valve is opened. The switch position of the three-way ball valve 17 is set to open the piston cavity 7 and the body inlet cavity 12, and to close the piston cavity 7 and the body outlet cavity 8. The liquid in the body inlet cavity 12 enters the piston cavity 7 through the pipe 115, the check valve 18 and the three-way ball valve 17, while the liquid in the piston cavity 7 cannot enter the body outlet cavity 8 through the three-way ball valve 17 and the pipe 115. Because the outer circle area of the piston 6 is larger than the inner circle area of the body outlet cavity stop 14, the piston 6 moves downward under pressure. After the piston 6 moves downward, the lower extension surface 13 of the piston 6 is sealed with the body outlet cavity stop 14, cutting off the liquid flow from the body inlet cavity 12 to the body outlet cavity 8, and the valve is closed.

[0131] 2. When liquid flows from the body outlet cavity 8 to the body inlet cavity 12, the switch position of the three-way ball valve 17 is set to close the piston cavity 7 and the body inlet cavity 12, and to open the piston cavity 7 and the body outlet cavity 8. The liquid in the body outlet cavity 8 enters the piston cavity 7 through the pipe 115 and the three-way ball valve 17, while the liquid in the piston cavity 7 cannot enter the body inlet cavity 12 through the three-way ball valve 17, the check valve 18 and the pipe 115. When the liquid pressure in the piston cavity 7 is equal to the liquid pressure in the body outlet cavity 8, the piston 6 moves downward under its own weight. After the piston 6 moves downward, the lower extension surface 13 of the piston 6 is sealed with the body outlet cavity stop 14, cutting off the liquid flow from the body outlet cavity 8 to the body inlet cavity 12, and the valve is closed. The switch position of the three-way ball valve 17 is set to open the piston cavity 7 and the body inlet cavity 12, and to close the piston cavity 7 and the body outlet cavity 8. The liquid in the body outlet cavity 8 cannot enter the piston cavity 7 through the pipe 115 and the three-way ball valve 17, while the liquid in the piston cavity 7 also cannot enter the body inlet cavity 12 through the three-way ball valve 17, the check valve 18 and the pipe 115. Therefore, the piston 6 does not move under pressure, the valve cannot be opened, and the purpose of one-way flow and two-way cut-off is achieved.

[0132] Example 13

[0133] The Z-shaped liquid control valve back valve and intercept valve without diaphragm shaft rod bushing spring, the piston inner cavity 7 is connected with the body inlet inner cavity 12 through the pipeline I 15 and the inlet two-way valve I 19 connecting body, and the piston inner cavity 7 is connected with the body outlet inner cavity 8 through the pipeline I 15 and the outlet two-way valve II 20 connecting body. Figure 29 As shown in the figure.

[0134] Specific description: the embodiment can adopt any optional structure in the application to assemble pipelines and valves under the condition of following the principles of the application, as shown in the figure. Figure 29 As shown in the figure.

[0135] Working principle:

[0136] 1. When the liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, the inlet two-way valve I 19 is closed, and the outlet two-way valve II 20 is opened, the liquid in the body inlet inner cavity 12 cannot flow into the piston inner cavity 7, but the liquid in the piston inner cavity 7 can flow into the body outlet inner cavity 8 through the pipeline I 15 and the outlet two-way valve II 20, at this time, the piston 6 is not pressed, and the lower extension end surface 13 of the piston is separated from the body outlet inner cavity stop 14 under the pushing of the liquid in the valve body inlet inner cavity 12, the liquid in the valve body inlet inner cavity 12 enters the body outlet inner cavity 8 through the valve body outlet inner cavity stop 14, and the valve is opened; when the liquid flows from the body outlet inner cavity 8 to the valve body inlet inner cavity 12, the pressure of the liquid in the piston inner cavity 7 depends on the size of the liquid in the body outlet inner cavity 8 entering the piston inner cavity 7, when the pressure of the liquid in the piston inner cavity 7 is equal to the pressure of the liquid in the body outlet inner cavity 8, the piston 6 moves downward under the action of gravity, and the lower extension end surface 13 of the piston is in line with the body outlet inner cavity stop 14 after the piston 6 moves downward, thereby sealing and cutting off the liquid flow from the valve body outlet inner cavity 8 to the valve body inlet inner cavity 12, the valve is closed, and the purpose of backflow prevention is achieved.

[0137] 2. When liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, the outlet two-way valve II 20 is closed and the inlet two-way valve I 19 is opened. The liquid in the body outlet inner cavity 8 cannot flow into the piston inner cavity 7, but the liquid in the piston inner cavity 7 can flow into the valve body inlet inner cavity 12 through the pipe I 15 and the inlet two-way valve I 19. Because the outer ring area of the piston 6 is larger than the inner ring area of the body outlet inner cavity stop 14, the piston 6 is pushed upward by the liquid in the valve body outlet inner cavity 8, and the extended end surface 13 below the piston 6 moves away from the body outlet inner cavity stop 14 when the piston 6 moves upward. The liquid in the body outlet inner cavity 8 flows into the body inlet inner cavity 12 through the body outlet inner cavity stop 14, and the valve is opened. When liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, the pressure of the liquid in the piston inner cavity 7 depends on the amount of liquid in the body inlet inner cavity 12 entering the piston inner cavity 7. When the pressure in the piston inner cavity 7 is the same as that in the body inlet inner cavity 12, the piston 6 will move downward under the action of the liquid pressure because the outer ring area of the piston 6 is larger than the inner ring area of the body outlet inner cavity stop 14. The extended end surface 13 below the piston 6 aligns with the valve body outlet inner cavity stop 14 after the piston 6 moves downward, sealing off the flow of liquid from the body inlet inner cavity 12 to the body outlet inner cavity 8, closing the valve, and achieving the purpose of non-return.

[0138] 3. Specifically, when liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, or when liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, the inlet two-way valve I 19 and the outlet two-way valve II 20 are operated so that one of the two-way valves is opened and the other is closed. One of the liquid flow directions is closed, thus achieving the functions of non-return and interception.

[0139] Example 14

[0140] The above-mentioned Z-shaped liquid control valve with a piston, a shaft, a sleeve, and a spring, and a two-way single interception valve, the piston inner cavity 7 is connected to the body inlet inner cavity 12 through the pipe I 15, the inlet two-way valve I 19, and the half-closed non-return valve 34, and the piston inner cavity 7 is connected to the body outlet inner cavity 8 through the pipe I 15, the outlet two-way valve II 20, and the half-closed non-return valve 34, as shown in Figure 30 .

[0141] Specifically, this example can use any of the optional structures in the present application to assemble pipes and valves while following the principles of the present application, as shown in Figure 30 .

[0142] Working principle:

[0143] 1. When liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, the inlet two-way valve I 19 and the outlet two-way valve II 20 are opened, at this time the semi-closed check valve 34 installed on the pipe 115 of the body inlet inner cavity 12 is half closed, the semi-closed check valve 34 installed on the pipe 115 of the body outlet inner cavity 8 is fully opened, the liquid in the body inlet inner cavity 12 flows into the piston inner cavity 7 through the pipe 115, the semi-closed check valve 34, the inlet two-way valve I 19 and the pipe 115, because the semi-closed check valve 34 installed on the pipe 115 of the body outlet inner cavity 8 is fully opened, the amount of liquid flowing into the piston inner cavity 7 is less than the amount of liquid flowing into the body outlet inner cavity 8, therefore the piston 6 is not pressed, the lower extension end surface 13 of the piston 6 is separated from the body outlet inner cavity stop 14 under the push of the liquid in the body inlet inner cavity 12, the liquid in the body inlet inner cavity 12 flows into the body outlet inner cavity 8 through the body outlet inner cavity stop 14, the valve is opened; the inlet two-way valve I 19 is opened and the outlet two-way valve II 20 is closed, at this time the semi-closed check valve 34 installed on the pipe 115 of the body inlet inner cavity 12 is half closed, not fully closed, which can make the liquid in the body inlet inner cavity 12 flow into the piston inner cavity 7 through the semi-closed check valve 34, the inlet two-way valve I 19 and the pipe 115, because the outlet two-way valve II 20 is closed, the liquid in the body inlet inner cavity 12 cannot flow into the body outlet inner cavity 8, the outer circle area of the piston 6 is larger than the inner circle area of the body outlet inner cavity stop 14, the piston 6 is pressed to move downward, the lower extension end surface 13 of the piston 6 is sealed with the body outlet inner cavity stop 14 after the piston 6 moves downward, which cuts off the liquid flowing from the body inlet inner cavity 12 to the body outlet inner cavity 8, the valve is closed.

[0144] 2. When liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, the inlet two-way valve I 119 and the outlet two-way valve II 120 are opened, at this time the semi-closed check valve 34 installed on the pipe 115 of the body outlet inner cavity 8 is half closed, the semi-closed check valve 34 installed on the pipe 115 of the body inlet inner cavity 12 is fully opened, the liquid in the body outlet inner cavity 8 flows into the piston inner cavity 7 through the pipe 115, the semi-closed check valve 34, the outlet two-way valve II 120 and the pipe 115, because the semi-closed check valve 34 installed on the pipe 115 of the body inlet inner cavity 12 is fully opened, the amount of liquid flowing into the piston inner cavity 7 is less than the amount of liquid flowing into the body inlet inner cavity 12, because the outer ring area of the piston 6 is larger than the inner ring area of the body outlet inner cavity stop 14, the piston 6 is pushed upward by the liquid in the body outlet inner cavity 8, the extended end surface 13 below the piston 6 leaves the body outlet inner cavity stop 14 when the piston 6 moves upward, the liquid in the body outlet inner cavity 8 flows into the body inlet inner cavity 12 through the body outlet inner cavity stop 14, the valve is opened; the inlet two-way valve I 119 is closed and the outlet two-way valve II 120 is opened, at this time the semi-closed check valve 34 installed on the pipe 115 of the valve body outlet inner cavity 8 is half closed, not fully closed, which can make the liquid in the valve body outlet inner cavity 8 flow into the piston inner cavity 7 through the pipe 115, the semi-closed check valve 34, the outlet two-way valve II 120 and the pipe 115, because the inlet two-way valve I 119 is closed, the liquid in the body outlet inner cavity 8 cannot flow from the piston inner cavity 7 to the body inlet inner cavity 12, when the liquid pressure in the piston inner cavity 7 is the same as the liquid pressure in the body outlet inner cavity 8, the piston 6 will move downward under the action of gravity, the extended end surface 13 below the piston 6 is in close contact with the body outlet inner cavity stop 14 after the piston 6 moves downward, which seals off the liquid flow from the body outlet inner cavity 8 to the valve body inlet inner cavity 12, and the valve is closed.

[0145] 3. Specifically, when liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8 or liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, the inlet two-way valve I 119 and the outlet two-way valve II 120 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 flow blocking.

[0146] Example 15

[0147] The above-mentioned Z-shaped liquid control valve two-way double cut-off valve with no diaphragm shaft rod sleeve spring, the piston inner cavity 7 is connected with a three-way valve 121 through a two-way valve 136, two outlets of the three-way valve 121 are respectively provided with a check valve 18, an outlet of one check valve 18 is connected with the body inlet inner cavity 12 through a pipeline 115, and an outlet of the other check valve 18 is connected with the body outlet inner cavity 8 through a pipeline 115, the piston inner cavity 7 is connected with a three-way valve 122 through a two-way valve 137, two outlets of the three-way valve 122 are respectively provided with a check valve 18, an outlet of one check valve 18 is connected with the body inlet inner cavity 12 through a pipeline 115, and an outlet of the other check valve 18 is connected with the body outlet inner cavity 8 through a pipeline 115, as shown in the figure. Figure 31

[0148] Specific description: the embodiment can adopt any optional structure in the application to assemble pipelines and valves under the condition of following the principle of the application, as shown in the figure. Figure 31

[0149] Working principle:

[0150] 1. When liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, the two-way valve 136 is closed, and the two-way valve 137 is opened. In this state, the two-way valve 136 disconnects the body inlet inner cavity 12 and the body outlet inner cavity 8 connected with the three-way valve 121 to make liquid enter the piston inner cavity 7. The two-way valve 137 is in an open state, the three-way valve 122 connected with the two-way valve 137 is connected with the body inlet inner cavity 12 through the check valve 18 and the pipeline 115, but the check valve 18 is not blocked to the body inlet inner cavity 12, so that liquid in the body inlet inner cavity 12 cannot enter the piston inner cavity 7. The two-way valve 137 is in an open state, the three-way valve 122 connected with the two-way valve 137 is connected with the body outlet inner cavity 8 through the check valve 18 and the pipeline 115, and the check valve 18 is not blocked to the liquid in the piston inner cavity 7, so that the liquid in the piston inner cavity 7 can flow to the body outlet inner cavity 8 through the two-way valve 137, the three-way valve 122, the check valve 18 and the pipeline 115. At this time, the piston 6 is not pressed, the lower extension end surface 13 of the piston 6 is separated from the body outlet inner cavity stop 14 under the pushing of the liquid in the body inlet inner cavity 12, the liquid in the body inlet inner cavity 12 enters the body outlet inner cavity 8 through the body outlet inner cavity stop 14, and the valve is opened.

[0151] ​​2. When liquid flows from the body-out end lumen 8 to the body-in end lumen 12, the two-way valve IV 36 is closed and the two-way valve V 37 is opened. In this state, the two-way valve IV 36 disconnects the body-in end lumen 12 and the body-out end lumen 8 connected by the three-way I 21 from the liquid entering the piston lumen 7; the two-way valve V 37 is in the open state, the three-way II 22 connected to the two-way valve V 37 connects the body-out end lumen 8 through the check valve 18 and the pipe I 15, but the check valve 18 is check to the body-out end lumen 8, so the liquid in the body-out end lumen 8 cannot enter the piston lumen 7; the two-way valve V 37 is in the open state, the three-way II 22 connected to the two-way valve V 37 connects the body-in end lumen 12 through the check valve 18 and the pipe I 15, but the check valve 18 is not check to the liquid in the piston lumen 7, so the liquid in the piston lumen 7 can flow to the body-in end lumen 12 through the two-way valve V 37, the three-way II 22, the check valve 18 and the pipe I 15; because the outer ring area of the piston 6 is larger than the inner ring area of the body-out end lumen stop 14, the piston 6 is pushed by the liquid in the body-out end lumen 8 to move upward, the extended end surface 13 below the piston 6 leaves the body-out end lumen stop 14 when the piston 6 moves upward, the liquid in the body-out end lumen 8 flows to the body-in end lumen 12 through the body-out end lumen stop 14, and the valve is opened.

[0152] 3. When liquid flows from the body-in end lumen 12 to the body-out end lumen 8, the two-way valve IV 36 is opened and the two-way valve V 37 is closed. In this state, the two-way valve V 37 disconnects the body-in end lumen 12 and the body-out end lumen 8 connected by the three-way II 22 from the liquid entering the piston lumen 7, the two-way valve IV 36 is in the open state, the three-way I 21 connected to the two-way valve IV 36 connects the body-out end lumen 8 through the check valve 18 and the pipe I 15, but the check valve 18 is check to the liquid in the piston lumen 8, so the liquid in the body-in end lumen 12 cannot enter the body-out end lumen 8, the two-way valve IV 36 is in the open state, the three-way I 21 connected to the two-way valve IV 36 connects the body-in end lumen 12 through the check valve 18 and the pipe I 15, but the check valve 18 is not check to the liquid in the body-in end lumen 12, so the liquid in the body-in end lumen 12 can enter the piston lumen 7, because the outer ring area of the piston 6 is larger than the inner ring area of the body-out end lumen stop 14, the piston 6 is pressed to move downward, the extended end surface 13 below the piston 6 is in close contact with the body-out end lumen stop 14 after the piston 6 moves downward, sealing and cutting off the liquid in the body-in end lumen 12 from flowing to the body-out end lumen 8, and the valve is closed.

[0153] 4. When liquid flows from the body-out end lumen 8 to the body-in end lumen 12, the two-way valve Ⅳ 36 is opened and the two-way valve Ⅴ 37 is closed. In this state, the two-way valve Ⅴ 37 disconnects the body-in end lumen 12 and the body-out end lumen 8 from the liquid entering the piston lumen 7, and the two-way valve Ⅳ 36 is in the open state, connecting the three-way Ⅰ 21 of the two-way valve Ⅳ 36 to the body-in end lumen 12 through the check valve 18 and the pipe Ⅰ 15. However, the check valve 18 does not allow the liquid in the piston lumen 7 to flow back, so the liquid in the body-out end lumen 8 cannot flow into the body-in end lumen 12. The two-way valve Ⅳ 36 is in the open state, connecting the three-way Ⅰ 21 of the two-way valve Ⅳ 36 to the body-out end lumen 8 through the check valve 18 and the pipe Ⅰ 15. However, the check valve 18 does not allow the liquid in the body-out end lumen 8 to flow back, so the liquid in the body-out end lumen 8 can flow into the piston lumen 7. When the liquid pressure in the piston lumen 7 is equal to the liquid pressure in the body-out end lumen 8, the piston 6 moves downward under the action of its own weight, and the lower extension surface 13 of the piston 6 aligns with the body-out end lumen stop 14 after moving downward, sealing and cutting off the flow of liquid from the body-out end lumen 8 to the body-in end lumen 12, and the valve is closed.

[0154] 5. Specifically, when liquid flows from the body-in end lumen 12 to the body-out end lumen 8 or from the body-out end lumen 8 to the body-in end lumen 12, the two-way valve Ⅳ 36 is closed and the two-way valve Ⅴ 37 is opened, allowing fluid to flow in both directions. When the two-way valve Ⅳ 36 is opened and the two-way valve Ⅴ 37 is closed, 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 flow in both directions.

[0155] Example 16

[0156] The above-mentioned membrane-free shaft rod bushing spring Z-shaped liquid control valve floating ball valve, the piston lumen 7 is connected to the body-in end lumen 12 through the pipe Ⅰ 15 and the inlet two-way valve Ⅰ 19, and is connected to the floating ball valve 23 through the outlet two-way valve Ⅱ 20 and the pipe Ⅰ 15. The body-out end lumen flange 24 is connected to the pipe Ⅱ 25 to the liquid pool 26, as shown in Figure 32 .

[0157] Specifically, this embodiment can use any of the structures in the present application to assemble pipes and valves while following the principles of the present application, as shown in Figure 32 .

[0158] Working principle:

[0159] Liquid flows from the body inlet cavity 12 to the body outlet cavity 8, the inlet two-way valve I 19 and the outlet two-way valve II 20 are opened, the opening of the inlet two-way valve I 19 is set to be smaller than that of the outlet two-way valve II 20, the liquid in the body inlet cavity 12 enters the piston cavity 7 through the pipe I 15 and the inlet two-way valve I 19, and then enters the air in the liquid pool 26 through the outlet two-way valve II 20, the pipe I 15 and the float valve 23, at this time, the piston 6 is not under pressure, the extended end surface 13 under the piston is separated from the body outlet cavity stop 14 under the push of the liquid in the body inlet cavity 12, the liquid in the body inlet cavity 12 enters the body outlet cavity 8 through the body outlet cavity stop 14, and then enters the liquid pool 26 through the pipe II 25 connected with the body outlet cavity flange 24; when the liquid in the liquid pool 26 rises to the float valve 23, the float valve 23 is closed, the liquid in the body inlet cavity 12 enters the piston cavity 7 through the inlet two-way valve I 19 and the pipe I 15, and then cannot enter the air in the liquid pool 26 through the outlet two-way valve II 20, the pipe I 15 and the float valve 23, because the outer circle area of the piston 6 is larger than the inner circle area of the body outlet cavity stop 14, the piston 6 moves downward under pressure, the extended end surface 13 under the piston is sealed with the body outlet cavity stop 14 after the piston 6 moves downward, and the liquid flow from the body inlet cavity 12 to the body outlet cavity 8 is cut off, and the valve is closed.

[0160] Example 17

[0161] The above-mentioned Z-shaped liquid control valve, the piston cavity 7 is connected with one outlet of the three-way pilot valve I 27 through the check valve 18 and the pipe I 15, the other outlet of the three-way pilot valve I 27 is connected with the liquid inlet 28 of the pump 35 through the pipe I 15, the inlet of the three-way pilot valve I 27 is connected with the body inlet cavity 12 through the pipe I 15 and the inlet two-way valve I 19, the three-way pilot valve I 27 is provided with a hand wheel 29, and the piston cavity 7 is connected with the body outlet cavity 8 through the pipe I 15 and the outlet two-way valve II 20, as shown in 33.

[0162] In this embodiment, the three-way pilot valve I 27 is a hand wheel three-way pilot valve.

[0163] Specific description: in this embodiment, any optional structure in the present application can be used to assemble pipes, valves and pilot valves under the condition of following the principle of the present application, as shown in 33. Figure 33

[0164] Working principle:

[0165] ​1. Start pump 35, liquid flows from body inlet cavity 12 to body outlet cavity 8, open inlet two-way valve I 19 and outlet two-way valve II 20, set the opening of inlet two-way valve I 19 to be smaller than that of outlet two-way valve II 20, at this time the piston 6 will not be pressed, the lower extension surface 13 of piston 6 will move away from the body outlet cavity stop 14 under the push of liquid in body inlet cavity 12, liquid in body inlet cavity 12 will flow into body outlet cavity 8 through body outlet cavity stop 14, the valve is open; the rotation of hand wheel 29 can make the liquid in inlet 28 of pump 35 flow into three-way pilot valve I 27 through pipe I 15, the liquid in three-way pilot valve I 27 flows into piston cavity 7 through pipe I 15 and check valve 18, the flow rate is set to ensure the pressure in body outlet cavity 8 is at a set value; when the flow rate of liquid in inlet 28 of pump 35 changes, the sensing diaphragm in three-way pilot valve I 27 will control the flow rate of liquid in piston cavity 7 through pipe I 15 and check valve 18, so that the opening of piston 6 will change accordingly, thus ensuring the pressure in body outlet cavity 8 will not change with the flow rate of liquid in inlet 28 of pump 35, achieving the purpose of flow limiting.

[0166] 2. Stop pump 35, liquid flows from body outlet cavity 8 to body inlet cavity 12, because check valve 18 is a check valve for piston cavity 7, liquid in piston cavity 7 will not flow to body inlet cavity 12 through check valve 18, pipe I 15, three-way pilot valve I 27 and inlet two-way valve I 19, nor to inlet 28 of pump 35 through pipe I 15, liquid in body outlet cavity 8 will flow into piston cavity 7 through outlet two-way valve II 20 and pipe I 15, when the pressure of liquid in piston cavity 7 is equal to that in body outlet cavity 8, piston 6 will move downward under the action of gravity, the lower extension surface 13 of piston 6 will align with body outlet cavity stop 14 after moving downward, sealing the flow of liquid from body outlet cavity 8 to body inlet cavity 12, the valve is closed, achieving the purpose of check.

[0167] Example 18

[0168] The above-mentioned Z-shaped liquid control valve with no diaphragm, shaft, rod and spring, piston cavity 7 is connected to an inlet of two-way pilot valve 30 through pipe I 15, the outlet of two-way pilot valve 30 is connected to body outlet cavity 8 through outlet two-way valve II 20 and pipe I 15, piston cavity 7 is connected to body inlet cavity 12 through pipe I 15 and inlet two-way valve I 19, the top of two-way pilot valve 30 has a screw rod 31, as shown in Figure 34 .

[0169] Specific description: this example can use any optional structure in the present application to assemble pipes, valves and pilot valves, as shown in Figure 34 .

[0170] Working principle:

[0171] Liquid flows from the body inlet cavity 12 to the body outlet cavity 8, the inlet two-way valve I 19 and the outlet two-way valve II 20 are opened, the opening of the inlet two-way valve I 19 is set to be smaller than that of the outlet two-way valve II 20, at this time the piston 6 is not under pressure, the lower extension surface 13 of the piston 6 is pushed by the liquid in the body inlet cavity 12 to move away from the body outlet cavity stop 14, the liquid in the body inlet cavity 12 enters the body outlet cavity 8 through the body outlet cavity stop 14, and the valve is opened; the rotation of the screw rod 31 on the two-way pilot valve 30 can set the flow rate of the liquid in the piston cavity 7 entering the body outlet cavity 8 through the outlet two-way valve II 20 to a value, so that the liquid pressure in the body outlet cavity 8 is fixed at a set value; when the liquid pressure in the body outlet cavity 8 changes, the sensing diaphragm in the two-way pilot valve 30 can control the flow rate of the liquid entering the body outlet cavity 8 from the piston cavity 7, so that the opening of the piston 6 changes with the change of the liquid pressure in the body outlet cavity 8, and the purpose of pressure reduction and pressure stabilization is achieved.

[0172] Example 19

[0173] The above-mentioned Z-shaped liquid control valve with a piston, a shaft, a sleeve and a spring, the piston cavity 7 is connected to one outlet of the three-way pilot valve II 32 through the pipeline I 15, the other outlet of the three-way pilot valve II 32 is connected to the body outlet cavity 8 through the outlet two-way valve II 20 and the pipeline I 15, the body inlet cavity 12 is connected to the inlet of the three-way pilot valve II 32 through the inlet two-way valve I 19 and the pipeline I 15, the piston cavity 7 is connected to the body outlet cavity 8 through the two-way valve III 33 and the pipeline I 15, and the three-way pilot valve II 32 has a screw rod 31 on the top, as shown in Figure 35 .

[0174] Specific description: this embodiment can use any optional structure in the present application to assemble pipelines, valves and pilot valves in the case of following the principles of the present application, as shown in Figure 35 .

[0175] Working principle:

[0176] 1. Liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, the inlet two-way valve I 19, the outlet two-way valve II 20 and the two-way valve III 33 are opened. The liquid in the body outlet inner cavity 8 flows through the pipe I 15 and the two-way valve III 33 into the piston inner cavity 7, and then through the pipe I 15 and the outlet two-way valve II 20 into the three-way pilot valve II 32. The top screw 31 of the three-way pilot valve II 32 is adjusted to a certain position. When the pressure in the body outlet inner cavity 8 rises to a set value, the liquid in the body outlet inner cavity 8 will flow through the pipe I 15 and the outlet two-way valve II 20 into the three-way pilot valve II 32 to open the pipe connecting the pipe I 15 and the inlet two-way valve I 19 of the three-way pilot valve II 32, and the pipe connecting the piston inner cavity 7 and the pipe I 15 of the three-way pilot valve II 32, so that the liquid in the piston inner cavity 7 flows through the pipe I 15 into the three-way pilot valve II 32, and then is discharged into the body inlet inner cavity 12. The amount of the liquid in the body outlet inner cavity 8 flowing through the pipe I 15 and the two-way valve III 33 into the piston inner cavity 7 is set to be less than the amount of the liquid in the piston inner cavity 7 flowing into the body inlet inner cavity 12. Because the outer circle area of the piston 6 is larger than the inner circle area of the body outlet inner cavity stop 14, the piston 6 is pushed by the liquid in the body outlet inner cavity 8 to move upward. The extended end surface 13 below the piston 6 leaves the body outlet inner cavity stop 14 when the piston 6 moves upward, so that the liquid in the body outlet inner cavity 8 flows through the body outlet inner cavity stop 14 into the body inlet inner cavity 12. The valve is opened, and the pressure is released.

[0177] 2. When the pressure in the body outlet inner cavity 8 is lower than the set value, the liquid in the body outlet inner cavity 8 cannot open the pipe connecting the pipe I 15 and the inlet two-way valve I 19 of the three-way pilot valve II 32, and the pipe connecting the piston inner cavity 7 and the pipe I 15 of the three-way pilot valve II 32, so that the liquid in the piston inner cavity 7 cannot be discharged into the body inlet inner cavity 12. However, the liquid in the body outlet inner cavity 8 can flow through the pipe I 15 and the two-way valve III 33 into the piston inner cavity 7. When the pressure in the piston inner cavity 7 is equal to the pressure in the body outlet inner cavity 8, the piston 6 moves downward under the action of gravity. The extended end surface 13 below the piston 6 seals with the body outlet inner cavity stop 14 when the piston 6 moves downward, so that the liquid in the body outlet inner cavity 8 is cut off from flowing into the body inlet inner cavity 12. The valve is closed, and the pressure is not released.

[0178] The above embodiments should be understood as merely illustrative of the present application, and should not be used to limit the scope of the present application. After reading the present application, those skilled in the art can make various modifications to the embodiments, and such modifications fall within the scope of the appended claims of the present application.

Claims

1. A diaphragmless shaft sleeve spring Z-type liquid control valve, comprising a cover (1), a body (3), a sealing ring groove (4), a sealing ring (5), a piston (6), an extended end face (13) below the piston, and a stop (14) in the inner cavity of the body outlet; characterized in that: The sealing ring groove (4) is provided on the cover (1), or on the body (3), or on both the cover (1) and the body (3), or on the seat (2) between the cover (1) and the body (3), or on both the cover (1) and the seat (2), or on both the seat (2) and the body (3), or on both the cover (1), the seat (2) and the body (3); The sealing ring (5) is installed in the sealing ring groove (4), the piston (6) is placed in the sealing ring (5), the cover (1) and the body (3) are sealed together as a whole, or the cover (1), seat (2) and body (3) are sealed together as a whole, and the piston (6) and the piston lower extension end face (13) are formed together as a whole; the cover (1) has a piston inner cavity (7), and the body (3) has an inlet end inner cavity (12) and an outlet end inner cavity (8); an outlet end inner cavity stop (14) is provided between the inlet end inner cavity (12) and the outlet end inner cavity (8). The outer ring (9) of the sealing ring seals with the sealing ring groove (4), and the inner ring (10) of the sealing ring seals with the outer ring (11) of the piston statically and slidingly, so that the piston inner cavity (7) and the body outlet inner cavity (8) are sealed. The lower extension end face (13) of the piston matches and seals with the stop (14) of the body outlet end cavity after the piston (6) moves, so that the body inlet end cavity (12) and the body outlet end cavity (8) are sealed. The piston cavity (7) is connected to the body inlet cavity (12) via pipe I (15) equipped with valve I (16), and the piston cavity (7) is connected to the body outlet cavity (8) via pipe I (15) equipped with valve II (57). The piston (6) and the lower extension end face (13) of the piston are vertically connected and fixed as a whole. The lower extension end face (13) of the piston has a sealing surface I (38). The sealing of the outer ring (9) of the sealing ring with the sealing ring groove (4) means that the outer ring (9) of the sealing ring has elasticity to maintain contact and seal with the sealing ring groove (4). The static sealing of the inner ring (10) of the sealing ring with the outer ring (11) of the piston means that the inner ring (10) of the sealing ring has elasticity to maintain contact and static seal with the outer ring (11) of the piston. The inner ring (10) of the sealing ring with the piston The outer ring (11) of the piston is a sliding seal, which means that the inner ring (10) of the sealing ring has elasticity and slides in contact with the outer ring (11) of the piston. Once the direction of the sealing ring expansion port (48) is pressurized by liquid, the sealing ring (5) will expand and contract with the increase and decrease of hydraulic pressure. If the sealing ring expansion port (48) is pressurized by hydraulic pressure in the opposite direction, the sealing ring (5) will not expand and contract with the increase and decrease of hydraulic pressure. The sealing ring (5) is installed in the sealing ring groove (4), and the direction of the sealing ring expansion port (48) is opposite to the piston inner cavity (7). The sealing ring (5) has a circular plane and a V-shaped cross-section (50). When the liquid flows from the inlet end cavity (12) to the outlet end cavity (8), the valve I (16) on the side of the inlet end cavity (12) is closed, and the valve II (57) on the side of the outlet end cavity (8) is opened. The liquid in the inlet end cavity (12) cannot enter the piston cavity (7). The piston cavity (7) is connected to the outlet end cavity (8). The extended end face (13) below the piston leaves the outlet end cavity stop (14) under the push of the liquid in the inlet end cavity (12). The liquid in the inlet end cavity (12) enters the outlet end cavity (8) through the outlet end cavity stop (14), and the valve is opened. When the liquid flows from the body outlet cavity (8) to the body inlet cavity (12), the valve I (16) on the body inlet cavity (12) side is opened and the valve II (57) on the body outlet cavity (8) side is closed. The liquid in the body outlet cavity (8) cannot enter the piston cavity (7). The liquid in the piston cavity (7) flows into the body inlet cavity (12) through the pipe I (15) and the valve I (16) on the body inlet cavity (12) side. At this time, the liquid pressure in the piston cavity (7) is the same as the liquid pressure in the body inlet cavity (12). The piston (6) is pushed upward by the liquid in the body outlet cavity (8). The extended end face (13) below the piston leaves the body outlet cavity stop (14) when the piston (6) moves upward. The liquid in the body outlet cavity (8) flows into the body inlet cavity (12) through the body outlet cavity stop (14). The valve is opened. When liquid needs to flow from the body outlet cavity (8) to the body inlet cavity (12), close valve I (16) on the body inlet cavity (12) side and open valve II (57) on the body outlet cavity (8) side. The liquid in the body outlet cavity (8) enters the piston cavity (7), while the liquid in the piston cavity (7) cannot flow into the body inlet cavity (12) through pipe I (15) and valve I (16) on the body inlet cavity (12) side. At this time, the liquid pressure in the piston cavity (7) is the same as the liquid pressure in the body outlet cavity (8). The piston (6) will move downward under its own weight. After the piston (6) moves downward, the extended end face (13) below the piston matches and seals with the stop (14) of the body outlet cavity after the piston (6) moves downward, cutting off the flow of liquid from the body outlet cavity (8) to the body inlet cavity (12). The valve is closed.

2. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The sealing ring groove (4) has a circular plane and a concave cross-sectional shape (49), the piston (6) has a circular plane and a U-shaped cross-section (56), and the inner cavity stop (14) of the body outlet has a circular plane. The inner diameter of the inner cavity stop (14) of the body outlet end is smaller than the outer diameter of the piston (6). The ring plane of the sealing ring groove (4) is parallel to the ring plane of the inner cavity stop (14) of the body outlet end, and the center line position coincides. The center line position of the ring plane of the sealing ring groove (4) coincides with the center line position of the piston (6) placed in the sealing ring (5). When the piston (6) is placed in the sealing ring (5), the outer ring (11) of the piston contacts the inner ring (10) of the sealing ring. The direction of the piston inner diameter opening (51) of the piston (6) placed in the sealing ring (5) is towards the piston inner cavity (7) or towards the opposite direction of the piston inner cavity (7).

3. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The number of sealing ring grooves (4) is more than one, and the number of installed sealing rings (5) is the same as the number of sealing ring grooves (4) and the model is matched. The cover (1) and body (3) are sealed and connected together and fixed together as a whole by fasteners. The sealing is achieved by sealing strips (52).

4. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The sealing ring groove (4) is machined on the top of the first sealing ring groove seat (46). The number of the sealing ring groove (4) is more than one. The number of the installed sealing rings (5) is the same as the number of the machined sealing ring grooves (4) and the model is matched. The first sealing ring groove seat (46) and the body (3) are sealed and connected together by fasteners to form a whole. The sealing is achieved by sealing strip (52). The cover (1) and the body (3) are sealed and connected together by fasteners to form a whole. The sealing is achieved by sealing strip (52).

5. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: A second sealing ring groove seat (47) is added between the cover (1) and the body (3). The sealing ring groove (4) is machined on the top of the second sealing ring groove seat (47). The number of the machined sealing ring groove (4) is more than one. The number of installed sealing rings (5) is the same as the number of machined sealing ring grooves (4) and the models are matched. The sealing connection between the cover (1), the second sealing ring groove seat (47) and the body (3) is fixedly connected into a whole by fasteners. The sealing is achieved by sealing strip (52).

6. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: There is a stop (40) above or below the sealing ring groove (4). The ring plane of the stop (40) is parallel to the ring plane of the sealing ring groove (4) and the center line is coincident. The upper outward extension (41) of the piston (6) or the lower end face (42) of the piston (6) matches and seals with the stop (40) after the piston (6) moves down. At the same time, the lower extension end face (13) of the piston matches and seals with the stop (14) of the inner cavity of the body outlet. The upper outward extension (41) of the piston (6) has a sealing surface II (53), and the lower end face (42) of the piston (6) has a sealing surface III (54). The sealing connection between the cover (1) and the body (3) is fixedly connected into a whole by fasteners, and the sealing is achieved by sealing strip (52).

7. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The seat (2) has a stop (40). The ring plane of the stop (40) is parallel to the ring plane of the sealing ring groove (4) and the center line is coincident. The upper outward extension (41) of the piston (6) or the lower end face (42) of the piston (6) matches and seals with the stop (40) after the piston (6) moves down. At the same time, the lower extension end face (13) of the piston matches and seals with the inner cavity stop (14) of the body outlet. The upper outward extension (41) of the piston (6) has a sealing surface II (53), and the lower end face (42) of the piston (6) has a sealing surface III (54). The sealing connection between the cover (1), seat (2) and body (3) is fixedly connected into a whole by fasteners, and the sealing is achieved by sealing strip (52).

8. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: A shaft (44) is mounted on the cover (1) and extends into the piston cavity (7). The shaft (44) is sealed at the contact point with the cover (1). The shaft (44) is axially movable relative to the cover (1).

9. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to the body inlet cavity (12) and the piston cavity (7) is connected to the body outlet cavity (8) via a valved pipe or directly through a pipe.

10. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 9, characterized in that: The valve is equipped with an electric actuator (43), which performs valve switching.

11. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The central axis of the piston (6) is inclined, and the lower extension end face (13) of the piston forms an angle with the horizontal plane.

12. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to a three-way valve (17) via pipe I (15). One outlet of the three-way valve (17) is connected to the body inlet cavity (12) via pipe I (15) and / or check valve (18). The other outlet of the three-way valve (17) is connected to the body outlet cavity (8) via pipe I (15).

13. The diaphragmless shaft bushing spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to the body inlet cavity (12) via pipe I (15) and inlet two-way valve I (19), and the piston cavity (7) is connected to the body outlet cavity (8) via pipe I (15) and outlet two-way valve II (20).

14. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to the inner cavity (12) of the inlet end via pipe I (15), inlet two-way valve I (19), and semi-closed check valve (34), and the piston cavity (7) is connected to the inner cavity (8) of the outlet end via pipe I (15), outlet two-way valve II (20), and semi-closed check valve (34).

15. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to a three-way valve I (21) via a two-way valve IV (36). A check valve (18) is installed at each of the two outlets of the three-way valve I (21). The outlet of one check valve (18) is connected to the inlet cavity (12) of the body via pipe I (15), and the outlet of the other check valve (18) is connected to the outlet cavity (8) of the body via pipe I (15). The piston cavity (7) is connected to a three-way valve II (22) via a two-way valve V (37). A check valve (18) is installed at each of the two outlets of the three-way valve II (22). The outlet of one check valve (18) is connected to the inlet cavity (12) of the body via pipe I (15), and the outlet of the other check valve (18) is connected to the outlet cavity (8) of the body via pipe I (15).

16. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to the body inlet cavity (12) via pipe I (15) and inlet two-way valve I (19). The piston cavity (7) is connected to the float valve (23) via outlet two-way valve II (20) and pipe I (15). The body outlet cavity flange (24) is connected to pipe II (25) to the liquid pool (26).

17. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to one outlet of the three-way pilot valve I (27) via the check valve (18) and pipe I (15). The other outlet of the three-way pilot valve I (27) is connected to the liquid inlet (28) of the pump (35) via pipe I (15). The inlet of the three-way pilot valve I (27) is connected to the inlet cavity (12) of the body via pipe I (15) and inlet two-way valve I (19). The piston cavity (7) is connected to the outlet cavity (8) of the body via pipe I (15) and outlet two-way valve II (20).

18. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to an inlet of a two-way pilot valve (30) via pipe I (15). The outlet of the two-way pilot valve (30) is connected to the outlet cavity (8) of the body via the outlet two-way valve II (20) and pipe I (15). The piston cavity (7) is connected to the inlet cavity (12) of the body via pipe I (15) and inlet two-way valve I (19). There is a screw (31) on the top of the two-way pilot valve (30).

19. The diaphragmless shaft sleeve spring Z-type liquid control valve according to claim 1, characterized in that: The piston cavity (7) is connected to one outlet of the three-way pilot valve II (32) via pipe I (15). The other outlet of the three-way pilot valve II (32) is connected to the body outlet cavity (8) via outlet two-way valve II (20) and pipe I (15). The body inlet cavity (12) is connected to the inlet of the three-way pilot valve II (32) via inlet two-way valve I (19) and pipe I (15). The piston cavity (7) is connected to the body outlet cavity (8) via two-way valve III (33) and pipe I (15). The top of the three-way pilot valve II (32) has a screw (31).

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