Spring-loaded Z-type liquid control valve without diaphragm

Abstract

This invention discloses a diaphragm-less, shaft-sleeve-spring-based Z-type liquid control valve. The liquid control valve includes a cover, a body, a sealing ring groove, a sealing ring, a piston, a lower extension end face of the piston, and a stop at the body outlet cavity. The sealing ring groove can be disposed 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 installed in the sealing ring groove, and the piston is placed within the sealing ring. The cover and the body, or the cover, seat, and body, are sealed as a single unit. The piston and the lower extension end face of the piston form a single unit. There are two sealing rings. The sealing ring closer to the stop at the body outlet cavity has its expansion port facing the piston cavity, while the sealing ring closer to the cover has its expansion port facing the opposite direction to the piston cavity. This invention eliminates the need for a diaphragm, shaft, sleeve, and spring, resulting in a simple structure and low head loss.

Description

[0001] This invention is a divisional application for a diaphragmless shaft bushing spring Z-type liquid control valve. The parent application was filed on December 16, 2020, and the application number is 2020114868265. Technical Field

[0002] This invention relates to a diaphragmless shaft sleeve spring Z-type liquid control valve, and in particular, through different processing structures and sealing ring assembly methods, a diaphragmless shaft sleeve spring liquid control valve that can meet the requirements of various liquid flow conditions can be formed. Background Technology

[0003] Existing liquid control valves require the use of diaphragms, shafts and bushings, and springs; during operation, the liquid flow direction can only be controlled in one direction; and static liquid flow cannot be set when required by the operating conditions.

[0004] Existing liquid control valves use diaphragms to push a throttling plate connected to a shaft to close or open the valve. Once the diaphragm is damaged, replacement is quite difficult and requires professional technicians. This is especially true for large-diameter valves, where diaphragm replacement is even more challenging. Furthermore, the cost of manufacturing and processing diaphragms for large-diameter liquid control valves is quite high.

[0005] Existing liquid control valves require the installation of a shaft and bushing to guide and push the throttling plate connected to the shaft in order to effectively close and open the valve. Because of the need for a shaft and bushing, scaling is prone to occur in many liquids, which can easily cause the valve to fail to close or open.

[0006] Existing liquid control valves can only control the direction of liquid flow in one direction during operation, thus limiting their application.

[0007] Existing liquid control valves require the use of springs to reset and increase stability when closing the valve. The spring force causes a certain pressure loss when the valve is opened, resulting in a large starting pressure requirement and a large head loss in the valve. Therefore, they can only be used under specific operating conditions. Summary of the Invention

[0008] This invention, a diaphragmless shaft-sleeve spring-loaded liquid control valve, overcomes the technical shortcomings of current liquid control valves. Through different structural processing and assembly methods, it eliminates the need for diaphragms, shafts, sleeves, and springs, forming a novel diaphragmless shaft-sleeve spring-loaded Z-type liquid control valve capable of meeting various liquid flow conditions. Under suitable conditions, liquid flow can be unidirectional or bidirectional through the diaphragmless shaft-sleeve spring-loaded Z-type liquid control valve, and it can also be unidirectionally or bidirectionally closed. Furthermore, the static liquid flow rate can be set under suitable conditions.

[0009] A diaphragmless shaft sleeve spring Z-type liquid control valve includes a cover, a body, a sealing ring groove, a sealing ring, a piston, an extended end face below the piston, and a stop in the inner cavity of the body outlet. Its structural feature is that the sealing ring groove is disposed on the cover, or on the body, or simultaneously on the cover and body, or on a seat between the cover and body, or simultaneously on the cover and seat, or simultaneously on the seat and body, or simultaneously on the cover, seat, and body. The sealing ring is installed in the sealing ring groove, the piston is placed in the sealing ring, the cover and body are sealed together as a whole, or the cover, seat and body are sealed together as a whole, and the piston and the piston's lower extension end face are formed as a whole; the cover has a piston cavity, and the body has a body inlet cavity and a body outlet cavity; a body outlet cavity stop is provided between the body inlet cavity and the body outlet cavity; The outer ring of the sealing ring seals with the sealing ring groove, and the inner ring of the sealing ring provides static and sliding seals with the outer ring of the piston, thereby sealing the piston cavity and the body outlet cavity. The lower extension end face of the piston matches and seals with the stop of the inner cavity of the body outlet end after the piston moves, so that the inner cavity of the body inlet end and the inner cavity of the body outlet end are sealed. The piston cavity is connected to the body inlet cavity via pipe I equipped with valve I, and the piston cavity is connected to the body outlet cavity via pipe I equipped with valve II. The piston and its lower extended end face are vertically connected and fixed as a whole. The lower extended end face of the piston has a sealing surface I. The outer ring of the sealing ring seals with the sealing ring groove, meaning that the outer ring of the sealing ring has elasticity to maintain contact and seal with the sealing ring groove. The inner ring of the sealing ring has static and sliding seals with the outer ring of the piston, meaning that the inner ring of the sealing ring has elasticity to maintain contact and seal with the outer ring of the piston. The outer ring and the inner ring of the sealing ring have elasticity. Once the direction of the sealing ring expansion port is pressurized by liquid, the sealing ring will expand and contract with the increase and decrease of hydraulic pressure. If the sealing ring expansion port is pressurized in the opposite direction, the sealing ring will not expand and contract with the increase and decrease of hydraulic pressure. The sealing ring is installed in the sealing ring groove. There are two sealing rings. Among the two sealing rings, the sealing ring with the expansion port facing the piston cavity is closer to the inner cavity stop of the body end, and the sealing ring with the expansion port facing the opposite direction of the piston cavity is closer to the cover side. When the liquid flows from the inlet end cavity to the outlet end cavity, valve I on the inlet end cavity side is closed and valve II on the outlet end cavity side is opened. The liquid in the inlet end cavity cannot enter the piston cavity. The piston cavity is connected to the outlet end cavity. The extended end face below the piston leaves the outlet end cavity stop under the push of the liquid in the inlet end cavity. The liquid in the inlet end cavity enters the outlet end cavity through the outlet end cavity stop, and the valve is opened. When the liquid flows from the inlet end cavity to the outlet end cavity, valve I on the inlet end cavity side is opened and valve II on the outlet end cavity side is closed. The liquid in the inlet end cavity enters the piston cavity. The piston cavity and the outlet end cavity are not connected. The liquid pressure in the piston cavity and the inlet end cavity of the valve body are the same. After being pressed, the piston moves downward. As the piston moves downward, the distance between the lower extension end face of the piston and the stop of the outlet end cavity will gradually approach. The liquid pressure difference between the inlet end cavity and the outlet end cavity will gradually increase. The lower extension end face of the piston matches and seals with the stop of the outlet end cavity, cutting off the flow of liquid from the inlet end cavity to the outlet end cavity of the valve body. The valve is closed. When the liquid flows from the outlet end cavity to the inlet end cavity, valve I on the inlet end cavity side is opened and valve II on the outlet end cavity side is closed. The liquid in the outlet end cavity cannot enter the piston cavity. The liquid in the piston cavity can flow into the inlet end cavity of the valve body through pipe I and valve I on the inlet end cavity side. At this time, the liquid pressure in the piston cavity is the same as the liquid pressure in the inlet end cavity. The piston is pushed upward by the liquid in the outlet end cavity. When the piston moves upward, the extended end face below the piston leaves the outlet end cavity stop. The liquid in the outlet end cavity flows into the inlet end cavity through the outlet end cavity stop, and the valve is opened. When liquid needs to flow from the outlet cavity to the inlet cavity, close valve I on the inlet cavity side and open valve II on the outlet cavity side. The liquid in the outlet cavity enters the piston cavity, while the liquid in the piston cavity cannot flow into the inlet cavity of the valve body through pipe I and valve I on the inlet cavity side. At this time, the liquid pressure in the piston cavity is the same as the liquid pressure in the outlet cavity. The piston will move downward under its own weight. After the piston moves downward, the extended end face below the piston matches the stop of the outlet cavity and seals, cutting off the flow of liquid from the outlet cavity to the inlet cavity. The valve is closed.

[0010] In some embodiments, the central axis of the piston is inclined, and the lower extension end face of the piston forms an angle with the horizontal plane.

[0011] In other embodiments, the diaphragmless shaft sleeve spring Z-type liquid control valve of the present invention includes a cover, a body, a sealing ring groove, a sealing ring, a piston, a lower extension end face of the piston, and a stop in the body outlet cavity. The sealing ring groove is above the cover, above the body, and above both the cover and the body. The sealing ring is installed in the sealing ring groove, and the piston is placed in the sealing ring. The piston and the lower extension end face of the piston are integrally formed. The cover and the body are sealed as a single unit. The inner cavity of the piston and the inner cavity of the body outlet cavity are sealed, such that the outer ring of the sealing ring seals with the sealing ring groove, and the inner ring of the sealing ring seals with the outer ring of the piston and provides a sliding seal. The inner cavity of the body inlet end and the inner cavity of the body outlet end are sealed, such that the lower extension end face of the piston matches and seals with the stop in the inner cavity of the body outlet end after the piston moves. The inner cavity of the piston is connected to the inner cavity of the body inlet end and the inner cavity of the body outlet end via pipes, valves, and pilot valves. The piston cavity is connected to the inlet cavity and outlet cavity via pipes, valves, and pilot valves, forming a liquid control valve that meets the needs of different working conditions.

[0012] The piston has a sealing surface I extending from its lower end face. The outer ring of the sealing ring seals with the sealing ring groove, meaning the outer ring of the sealing ring elastically maintains contact and seals with the sealing ring groove. The inner ring of the sealing ring provides both static and sliding seals with the piston's outer ring, meaning the inner ring of the sealing ring elastically maintains contact and seals with the piston's outer ring. Both the outer and inner rings of the sealing ring are elastically maintained. Once the direction of the sealing ring's expansion port is pressurized by liquid, the sealing ring will expand and contract with the increase or decrease of hydraulic pressure. If the sealing ring's expansion port is pressurized in the opposite direction, the sealing ring will not expand and contract with the increase or decrease of hydraulic pressure. The sealing ring is installed in the sealing ring groove, with the expansion port of the sealing ring facing towards the piston's inner cavity or in the opposite direction. The cover, body, or cover, seat, and body are sealed and fixed as a whole. The piston's inner cavity is connected to the body's inlet cavity and body's outlet cavity via a pipe with a valve or directly through a pipe, valve connection, or pilot valve connection.

[0013] In some embodiments of the present invention, the plane of the sealing ring groove is circular and the cross-sectional shape is concave; the plane of the sealing ring is circular and the cross-sectional shape is V-shaped; the plane of the piston is circular and the cross-sectional shape is U-shaped; the plane of the outlet inner cavity stop is circular; the inner diameter of the outlet inner cavity stop is smaller than the outer diameter of the piston; the plane of the sealing ring groove is parallel to the plane of the outlet inner cavity stop and the center line is the same; the center line of the sealing ring groove is the same as and perpendicular to the center line of the piston placed in the sealing ring; the outer ring of the piston placed in the sealing ring needs to contact the inner ring of the sealing ring; the direction of the piston inner diameter opening of the piston placed in the sealing ring is towards the piston inner cavity or towards the opposite direction of the piston inner cavity; the piston and the piston lower extension end face are perpendicularly connected. The components are fixed as a whole. The lower extended end face has a sealing surface. The outer ring of the sealing ring seals with the sealing ring groove by elastically maintaining contact and sealing with the sealing ring groove. The inner ring of the sealing ring seals and slides with the piston outer ring by elastically maintaining contact and sealing with the piston outer ring. The outer and inner rings of the sealing ring are elastically maintained. Once the direction of the sealing ring expansion port is subjected to liquid pressure, the sealing ring will expand and contract with the increase and decrease of hydraulic pressure. If the sealing ring expansion port is subjected to hydraulic pressure in the opposite direction, the sealing ring will not expand and contract with the increase and decrease of hydraulic pressure. The sealing ring is installed in the sealing ring groove, with the direction of the sealing ring expansion port facing the piston inner cavity or in the opposite direction to the piston inner cavity. The cover and body are sealed and fixed as a whole. The piston inner cavity is connected to the body inlet cavity and body outlet cavity via pipes, valves, and pilot valves. The piston cavity is connected to the inlet cavity and outlet cavity via pipes, valves, and pilot valves, forming a liquid control valve that meets the needs of different working conditions.

[0014] Description of the sealing ring groove machining structure and sealing ring assembly structure: There are 14 structural forms of sealing ring groove processing structure and sealing ring assembly structure. However, during the manufacturing and installation of valves, the form of sealing ring groove processing structure and sealing ring assembly structure may vary as needed. As long as the basic structural principle of this invention is followed, any variation in the form of sealing ring groove processing structure and sealing ring assembly structure beyond the scope of this invention is also within the protection scope of this invention.

[0015] In some embodiments of the present invention, the sealing ring groove is machined on the top of the cover, on the top of the body, or on both the cover and the body, with one of the three machining methods selectable. The number of machined sealing ring grooves is one or more, and the number of installed sealing rings is the same as the number of machined sealing ring grooves and their models match. The cover and body are sealed together by screws to form a single unit, and the seal is achieved using a sealing strip. The sealing ring groove can also be machined simultaneously on the cover and body, or on the seat between the cover and body, or simultaneously on the cover and seat, or simultaneously on the seat and body, or simultaneously on the cover, seat, and body, or simultaneously on the cover and body without a seat between them. One of eight machining methods is available.

[0016] In some embodiments of the present invention, 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, or on the top of the cover and the body. One of the five machining methods is selected. The number of machined sealing ring grooves is one or more. The number of installed sealing rings is the same as the number of machined sealing ring grooves and the models are matched. The cover, the seat and the body are sealed together by screws to form a whole. The sealing is achieved by sealing strips.

[0017] In some embodiments of the present invention, the sealing ring groove is machined on the upper part of the type I sealing ring groove seat, and the number of machined sealing ring grooves is one or more. The number of installed sealing rings is the same as the number of machined sealing ring grooves and the models are matched. The type I sealing ring groove seat and the body are sealed together by screws to form a whole, and the sealing is achieved by sealing strips. The cover and the body are sealed together by screws to form a whole, and the sealing is achieved by sealing strips.

[0018] In some embodiments of the present invention, a Type II sealing ring groove seat is added between the cover and the body. The sealing ring groove is machined on the top of the Type II sealing ring groove seat. The number of machined sealing ring grooves is one or more. The number of installed sealing rings is the same as the number of machined sealing ring grooves and the models are matched. The cover, the Type II sealing ring groove seat and the body are sealed together by screws to form a whole. The sealing is achieved by sealing strips.

[0019] In some embodiments of the present invention, there is a stop opening above or below the sealing ring groove. The ring plane of the stop opening is parallel to the ring plane of the sealing ring groove and the center line is the same. The upper outward extension of the piston or the lower end face of the piston matches and seals with the stop opening after the piston moves downward. At the same time, the lower extension end face of the piston matches and seals with the stop opening of the inner cavity of the body outlet. The upper outward extension of the piston has a sealing surface II, and the lower end face of the piston has a sealing surface III. The cover and the body are sealed together by screws to form a whole, and the seal is achieved by a sealing strip.

[0020] In some embodiments of the present invention, a seat is added between the cover and the body, and a stop port is provided on the seat. The plane of the stop port is parallel to the plane of the sealing ring groove and the center line is the same. The upper outward extension of the piston or the lower end face of the piston matches and seals with the stop port after the piston moves downward. At the same time, the lower extension end face of the piston matches and seals with the stop port of the inner cavity of the body outlet. The upper outward extension of the piston has a sealing surface II, and the lower end face of the piston has a sealing surface III. The cover, seat and body are sealed together by screws to form a whole, and the seal is achieved by a sealing strip.

[0021] In some embodiments of the present invention, a shaft is mounted on the cover and extends into the piston cavity, the shaft is sealed at the contact point with the cover, and the shaft can be moved up and down by rotating a handwheel.

[0022] In some embodiments of the present invention, the piston inner cavity is connected to the body inlet end inner cavity, and the piston inner cavity is connected to the body outlet end inner cavity via a valved pipe or directly through a pipe; preferably, the valve is equipped with an electric actuator, and the installed electric actuator replaces the manual valve opening and closing.

[0023] The piston inner cavity, the body inlet end inner cavity, and the body outlet end inner cavity described in this invention are connected via pipes, valves, and a pilot valve connection. (Explanation 1:) The piston inner cavity is connected to the inlet and outlet inner cavities of the body via pipes, valves, and pilot valves, forming a diaphragmless shaft-sleeve spring Z-type liquid control valve that meets the needs of different operating conditions. This invention provides nine possible pipe, valve, and pilot valve connections, but these are not limited to these nine. Depending on the operating conditions, modifications to the pipe, valve, and pilot valve connections between the piston inner cavity and the inlet and outlet inner cavities of the body, while adhering to the principles of this invention, are also within the scope of this invention.

[0024] The piston inner cavity, the body inlet end inner cavity, and the body outlet end inner cavity described in this invention are connected via pipes, valves, and a pilot valve connection. (Explanation 2:) All manufacturing structures of the present invention can utilize the pipe connections, valve connections, and pilot valve connections of the present invention to form diaphragmless shaft sleeve spring Z-type liquid control valves that meet the requirements of different working conditions. Depending on the working conditions, the manufacturing structures of the present invention can be modified via pipe connections, valve connections, and pilot valve connections between the piston inner cavity and the body inlet and outlet inner cavities, while adhering to the principles of the present invention, to meet the required working conditions. Such modifications to the pipe connections, valve connections, and pilot valve connections are also within the scope of protection of the present invention.

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

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

[0027] In some embodiments of the present invention, the piston inner cavity is connected to pipe I, inlet two-way valve I, and semi-closed check valve connecting body inlet inner cavity, and the piston inner cavity is connected to pipe I, outlet two-way valve II, and semi-closed check valve connecting body outlet inner cavity.

[0028] In some embodiments of the present invention, the piston cavity is connected to a three-way valve I via a two-way valve IV. A check valve is installed at each of the two outlets of the three-way valve I. The outlet of one check valve is connected to the inlet cavity of the valve body via pipe I, and the outlet of the other check valve is connected to the outlet cavity of the valve body via pipe I. The piston cavity is connected to a three-way valve II via a two-way valve V. A check valve is installed at each of the two outlets of the three-way valve II. The outlet of one check valve is connected to the inlet cavity of the valve body via pipe I, and the outlet of the other check valve is connected to the outlet cavity of the valve body via pipe I.

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

[0030] In some embodiments of the present invention, the piston cavity is connected to one outlet of a three-way pilot valve I via a check valve and pipe I, the other outlet of the three-way pilot valve I is connected to the liquid inlet of the pump via pipe I, the inlet of the three-way pilot valve I is connected to the inlet cavity of the body via pipe I and inlet two-way valve I, and the piston cavity is connected to the outlet cavity of the body via pipe I and outlet two-way valve II.

[0031] In some embodiments of the present invention, the piston cavity is connected to an inlet of a two-way pilot valve via pipe I, the outlet of the two-way pilot valve is connected to the outlet cavity of the pipe I connecting body via outlet two-way valve II, the piston cavity is connected to the inlet cavity of the pipe I connecting body via inlet two-way valve I, and a screw is located at the top of the two-way pilot valve.

[0032] In some embodiments of the present invention, the piston cavity is connected to one outlet of a three-way pilot valve II via pipe I, the other outlet of the three-way pilot valve II is connected to the body outlet cavity via an outlet two-way valve II and pipe I, the body inlet cavity is connected to the inlet of the three-way pilot valve II via an inlet two-way valve I and pipe I, the piston cavity is connected to the body outlet cavity via a two-way valve III and pipe I, and a screw is located at the top of the three-way pilot valve II.

[0033] Using the diaphragmless shaft sleeve spring Z-type liquid control valve described in this invention, its processing structure and assembly method allow the diaphragm of the liquid control valve to be replaced by a sealing ring, eliminating the need for a shaft and sleeve for navigation, thus simplifying assembly. After installation and use, if the sealing ring or piston is damaged, its unique manufacturing and assembly methods make maintenance extremely convenient, requiring no professional technicians for replacement. Therefore, the service life of the diaphragmless shaft sleeve spring Z-type liquid control valve can be essentially the same as that of the pipeline.

[0034] The diaphragmless shaft sleeve spring Z-type liquid control valve of the present invention reduces the failure rate of liquid control valves and increases and expands the application range of liquid control valves due to its unique design.

[0035] In terms of manufacturing, the Z-type liquid control valve of this invention, which is a diaphragmless shaft bushing spring valve, simplifies manufacturing and reduces costs because it does not have a diaphragm, shaft, or bushing. In particular, the equipment required for manufacturing large-diameter liquid control valves can be significantly reduced, thus enabling the manufacture of ultra-large diameter liquid control valves.

[0036] Using the diaphragmless shaft bushing spring Z-type liquid control valve described in this invention, its structure and assembly method allow the liquid control valve to be assembled on-site as a single component. This can significantly reduce transportation and installation costs, especially in the transportation and installation of large valves.

[0037] Using the diaphragmless shaft sleeve spring Z-type liquid control valve described in this invention, its structure eliminates the need for a diaphragm, shaft, sleeve, and spring. Liquid can pass through the valve in one or both directions, and the valve can be closed in one or both directions. Liquid flow and pressure can be dynamically and statically controlled. Therefore, the liquid control valve can meet the technical and performance requirements of gate valves, butterfly valves, globe valves, flow restrictors, check valves, float valves, pressure reducing valves, pressure relief valves, electric valves, etc., and it is particularly easy to achieve intelligent control of liquid flow. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the basic structure of the first type of diaphragmless shaft sleeve spring Z-type liquid control valve; wherein a) is a front sectional view of the body, b) is a partially enlarged front sectional view of the cover and groove, c) is an overall front sectional view of the piston and its extension end face, d) is a partially enlarged front sectional view of the sealing ring, and e) is a schematic diagram of the front sectional view of the valve embodiment.

[0039] Figure 2 This is a schematic diagram of the basic structure of the second type of diaphragmless shaft sleeve spring Z-type liquid control valve; wherein a) is a partially enlarged front sectional view of the body and groove, b) is a front sectional view of the cover, c) is a full front sectional view of the piston and its extended end face, d) is a partially enlarged front sectional view of the sealing ring, and e) is a schematic diagram of the front sectional view of the valve embodiment.

[0040] Figure 3 This is a schematic diagram of the basic structure of the third type of diaphragmless shaft sleeve spring Z-type liquid control valve; where a) is a front sectional view of the body, b) is a front sectional view of the cover, c) is a front sectional view of the piston and the extended end face as a whole, and d) is a schematic diagram of the valve embodiment and a partially enlarged front sectional view of the sealing ring and groove.

[0041] Figure 4 This is a schematic diagram of the basic structure of the fourth type of diaphragmless shaft sleeve spring Z-type liquid control valve, and a front cross-sectional view of an embodiment of the valve.

[0042] Figure 5 This is a schematic diagram of the basic structure of the fifth type of diaphragmless shaft sleeve spring Z-type liquid control valve; wherein a) is a front sectional view of the body, b) is a partially enlarged front sectional view of the cover and concave groove, c) is a front sectional view of the piston and its extension end face as well as the U-shaped piston, d) is a partially enlarged front sectional view of the V-shaped sealing ring, and e) is a schematic diagram of the front sectional view of the valve embodiment.

[0043] Figure 6 This is a schematic diagram of the basic structure of the sixth type of diaphragmless shaft sleeve spring Z-type liquid control valve; wherein a) is a partially enlarged front sectional view of the body and concave groove, b) is a front sectional view of the cover, c) is a front sectional view of the piston and its extension end face as well as the U-shaped piston, d) is a partially enlarged front sectional view of the sealing ring, and e) is a schematic diagram of the front sectional view of the valve embodiment.

[0044] Figure 7 This is a schematic diagram of the basic structure of the seventh type of diaphragmless shaft sleeve spring Z-type liquid control valve; a schematic diagram of the valve embodiment and a partially enlarged front cross-sectional view of the concave groove.

[0045] Figure 8 This is a schematic diagram of the basic structure of the eighth type of diaphragmless shaft sleeve spring Z-type liquid control valve; a valve embodiment and a partially enlarged front cross-sectional view of the sealing ring expansion port.

[0046] Figure 9 This is a schematic diagram of the sealing ring groove machining structure and sealing ring assembly structure of the ninth type of diaphragmless shaft bushing spring Z-type liquid control valve; wherein a) is a front sectional view of the body, b) is a front sectional view of the cover, c) is a front sectional view of the piston and its extension end face as well as the U-shaped piston, d) is a front sectional view of the sealing ring and its partial enlarged front sectional view, and e) is a schematic diagram of the front sectional view and the partial enlarged view of the concave groove of the valve embodiment.

[0047] Figure 10 This is a schematic diagram of the sealing ring groove machining structure and sealing ring assembly structure of the tenth type of diaphragmless shaft bushing spring Z-type liquid control valve; wherein a) is a front sectional view of the body, b) is a front sectional view of the cover, c) is a front sectional view of the piston and its extension end face as well as the U-shaped piston, d) is a front sectional view of the sealing ring and its partial enlarged front sectional view, and e) is a schematic diagram of the front sectional view and the partial enlarged view of the concave groove of the valve embodiment.

[0048] Figure 11 This is the sealing ring groove machining structure and sealing ring assembly structure of the eleventh type of diaphragmless shaft bushing spring Z-type liquid control valve; wherein a) is a front sectional view of the body, b) is a front sectional view of the cover, c) is a front sectional view of the piston and the extended end face as a whole and the U-shaped piston, d) is a sealed ring and its partially enlarged front sectional view, and e) is a schematic diagram of the front sectional view and the partially enlarged concave groove of the valve embodiment.

[0049] Figure 12 This is a schematic diagram of the sealing ring groove machining structure and sealing ring assembly structure of the twelfth type of diaphragmless shaft bushing spring Z-type liquid control valve; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) front sectional view of the sealing ring and its partially enlarged front sectional view, f) front sectional view of the valve embodiment and partially enlarged view of the concave groove.

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

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

[0052] Figure 15 This is a schematic diagram of the sealing ring groove machining structure and sealing ring assembly structure of the fifteenth type of diaphragmless shaft bushing spring Z-type liquid control valve; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) front sectional view of the sealing ring and its partially enlarged front sectional view, f) front sectional view of the valve embodiment and partially enlarged view of the concave groove.

[0053] Figure 16 This is a schematic diagram of the sealing ring groove machining structure and sealing ring assembly structure of the sixteenth type of diaphragmless shaft bushing spring Z-type liquid control valve; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) front sectional view of the sealing ring and its partially enlarged front sectional view, f) front sectional view of the valve embodiment and partially enlarged view of the concave groove.

[0054] Figure 17 This is a schematic diagram of the sealing ring groove machining structure and sealing ring assembly structure of the seventeenth type of diaphragmless shaft bushing spring Z-type liquid control valve; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) front sectional view of the sealing ring and its partially enlarged front sectional view, f) front sectional view of the valve embodiment and partially enlarged view of the concave groove.

[0055] Figure 18This is the sealing ring groove machining structure and sealing ring assembly structure of the eighteenth type of diaphragmless shaft bushing spring Z-type liquid control valve; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) sealing ring and its partially enlarged front sectional view, f) front sectional view of the valve embodiment and a partially enlarged schematic diagram of the concave groove.

[0056] Figure 19 This is a schematic diagram of the basic structure of a diaphragmless shaft bushing spring Z-type liquid control valve with a double stop valve structure; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the sealing ring and its partial enlarged front sectional view, e) front sectional view of the valve embodiment and partial enlarged view of the concave groove, sealing ring and upper stop.

[0057] Figure 20 This is a schematic diagram of a double-stop valve structure under the basic structure of a Z-type liquid control valve without a diaphragm, shaft, bushing, and spring; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the sealing ring and its partial enlarged front sectional view, e) front sectional view of the valve embodiment and partial enlarged view of the concave groove, sealing ring, and upper stop.

[0058] Figure 21 This is a schematic diagram of a double-stop valve structure on the basic structure of another type of Z-type liquid control valve without a diaphragm, shaft, bushing, and spring; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) front sectional view of the sealing ring and its partial enlarged front sectional view, f) front sectional view of the valve embodiment and partial enlarged view of the concave groove, sealing ring, and upper stop.

[0059] Figure 22 This is a schematic diagram of a double-stop valve structure under the basic structure of another diaphragmless shaft bushing spring Z-type liquid control valve; a) front sectional view of the body, b) front sectional view of the cover, c) front sectional view of the piston and its extension end face as well as the U-shaped piston, d) front sectional view of the seat, e) front sectional view of the sealing ring and its partial enlarged front sectional view, f) front sectional view of the valve embodiment and partial enlarged view of the concave groove, sealing ring and upper stop.

[0060] Figure 23 This is a schematic diagram of the basic structure of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve, which is also a flow-limiting valve.

[0061] Figure 24 This is a schematic diagram of the basic structure of a Z-type liquid control valve without a diaphragm, shaft, bushing, and spring, which is also a flow-limiting valve.

[0062] Figure 25This is a schematic diagram of the basic structure of a diaphragmless, shaft-sleeve, spring-driven Z-type liquid control valve, and the electric valve structure.

[0063] Figure 26 This is a schematic diagram of the basic structure of another type of diaphragmless shaft bushing spring Z-type liquid control valve, an electric valve structure.

[0064] Figure 27 This is a schematic diagram of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve, a one-way, single-stop valve.

[0065] Figure 28 This is a schematic diagram of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve, a one-way double-stop valve.

[0066] Figure 29 This is a schematic diagram of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve, which also functions as a check valve and shut-off valve.

[0067] Figure 30 This is a schematic diagram of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve, a bidirectional single-stop valve.

[0068] Figure 31 This is a schematic diagram of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve, a bidirectional, double-stop valve.

[0069] Figure 32 This is a schematic diagram of a Z-type liquid control valve (float valve) without a diaphragm, shaft, bushing, and spring.

[0070] Figure 33 This is a schematic diagram of a Z-type liquid control valve (flow limiting valve and check valve) without a diaphragm, shaft, bushing, and spring.

[0071] Figure 34 This is a schematic diagram of a diaphragmless, shaft-sleeve, spring-loaded Z-type liquid control valve for pressure reduction and stabilization.

[0072] Figure 35 This is a schematic diagram of a Z-type liquid control valve / pressure relief valve without a diaphragm, shaft, bushing, or spring. Attached image description: 1. Cover; 2. Seat; 3. Body; 4. Sealing ring groove; 5. Sealing ring; 6. Piston; 7. Piston inner cavity; 8. Body outlet inner cavity; 9. Outer ring of sealing ring; 10. Piston outer ring; 11. Body inlet inner cavity; 12. Piston lower extension end face; 13. Body outlet inner cavity stop; 14. Pipe I; 15. Valve I; 16. Three-way valve; 17. Check valve; 18. Inlet two-way valve I; 19. Outlet two-way valve II; 20. Three-way valve I; 21. Three-way valve II; 22. Float valve; 23. 24. Inner flange at body outlet, 25. Pipe II, 26. Liquid pool, 27. Three-way pilot valve I, 28. Liquid inlet, 29. Handwheel, 30. Two-way pilot valve, 31. Screw, 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. Stop port, 41. Upper outward extension, 42. Lower end face, 43. Electric valve, 44. Shaft, 45. Rotary handwheel, 46. T-type sealing ring groove seat, 47. Type II sealing ring groove seat, 48. Sealing ring expansion port, 49. Concave, 50. V-shaped, 51. Piston inner diameter port, 52. Sealing strip, 53. Sealing surface II, 54. Sealing surface III, 55. Screw, 56. U-shaped, 57. Valve II. Detailed Implementation

[0074] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" used below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0075] Example 1 like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the diaphragmless shaft sleeve spring Z-type liquid control valve of the present invention includes 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 end. The sealing groove 4 is on top of the cover 1, on top of the body 3, and on top of both the cover 1 and the body 3. The sealing ring 5 is installed in the sealing groove 4. The piston 6 is placed in the sealing ring 5. The piston 6 and the piston's lower extension end face 13 are an integral unit. The cover 1 and the body 3 are sealed as an integral unit. The piston's inner cavity 7 and the body's outlet inner cavity 8 are sealed together, so that the outer ring 9 of the sealing ring seals with the sealing groove 4 and the inner ring 10 of the sealing ring seals with the piston's outer ring 11 and provides a sliding seal. The body's inlet inner cavity 12 and the body's outlet inner cavity 8 are sealed together, so that the piston's lower extension end face 13 matches and seals with the body's outlet inner cavity stop 14 after the piston 6 moves. The piston's inner cavity 7 is connected to the body's inlet inner cavity 12 and the body's outlet inner cavity 8 via a pipe connection, a valve connection, or a pilot valve connection.

[0076] Example 2 In the aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve, such as Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the plane of the sealing ring groove 4 is circular and the cross-sectional shape is concave 49; the plane of the sealing ring 5 is circular and the cross-sectional shape is V-shaped 50; the plane of the piston 6 is circular and the cross-sectional shape is U-shaped 56; the plane of the outlet inner cavity stop 14 is circular; the inner diameter of the outlet inner cavity stop 14 is smaller than the outer diameter of the piston 6; the distance between the ring plane of the sealing ring groove 4 and the ring plane of the outlet inner cavity stop 14 is parallel and the center line position is the same; the center line position of the ring plane of the sealing ring groove 4 is the same as and perpendicular to the center line position of the piston 6 placed in the sealing ring 5; the piston outer ring 11 and the inner ring 10 of the sealing ring 6 placed in the sealing ring 5 need to contact; 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; the piston 6 and the piston lower extension end face 13 are vertically connected and fixed into a whole; the lower extension end face 13 has a sealing surface. I38, the outer ring 9 of the sealing ring seals with the sealing ring groove 4 by means of elasticity, and the inner ring 10 of the sealing ring seals with the outer ring 11 of the piston by means of elasticity, and the inner ring 10 of the sealing ring seals with the outer ring 11 of the piston by means of elasticity, and the outer ring 9 and the inner ring 10 of the sealing ring are elastically maintained. 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 towards the piston inner cavity 7 or towards the opposite direction of the piston inner cavity 7. The cover 1 and the body 3 are sealed and fixed as a whole. The piston inner cavity 7 is connected to the body inlet inner cavity 12 and the body outlet inner cavity 8 through pipes, valves, and pilot valves.

[0077] Specific description: The structure of the diaphragmless shaft sleeve spring Z-type liquid control valve of the present invention allows the diaphragmless shaft sleeve spring Z-type liquid control valve to eliminate the need for installing a diaphragm, shaft, sleeve, and spring; liquid can pass through the diaphragmless shaft sleeve spring Z-type liquid control valve in both directions; the diaphragmless shaft sleeve spring Z-type liquid control valve can also close the liquid passage in both directions.

[0078] The working principle is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown.

[0079] 1. The piston cavity 7, the inlet cavity 12, and the outlet cavity 8 are connected via pipe I 15, valve I 16, and valve II 57. When liquid flows from the inlet cavity 12 to the outlet cavity 8, valve I 16 on the inlet cavity 12 side is closed, and valve II 57 on the outlet cavity 8 side is opened. Liquid in the inlet cavity 12 cannot enter the piston cavity 7, and the piston's lower extension end face 13 is pushed away from the body by the liquid in the inlet cavity 12. The liquid in the body inlet cavity 12 enters the body outlet cavity 8 through the body outlet cavity stop 14. Since the piston cavity 7 and the body outlet cavity 8 are connected, the liquid pressure in the piston cavity 7 and the body outlet cavity 8 is the same. The liquid in the body inlet cavity 12 can enter the body outlet cavity 8 through the body outlet cavity stop 14 only depends on the overall weight of the piston 6 and the piston lower extension end face 13 vertically fixedly connected and the sealing. The inner ring 10 of the sealing ring has elasticity to maintain contact and seal with the outer ring 11 of the piston, and the resistance caused by friction is small. When the sealing ring 5 is not pressurized by liquid, the inner ring 10 of the sealing ring has very little elasticity to maintain contact and seal with the outer ring 11 of the piston, and the resistance caused by friction is also small. As long as the liquid in the inner cavity 12 of the body inlet can overcome the overall weight of the piston 6 and the piston lower extension end face 13 vertically fixed connection and the pressure loss caused by the resistance caused by friction of the inner ring 10 of the sealing ring to maintain contact and seal with the outer ring 11 of the piston, the liquid in the inner cavity 12 of the body inlet can flow into the inner cavity 8 of the body outlet. Therefore, the pressure loss of the liquid flowing through the stop 14 of the inner cavity of the body outlet into the inner cavity 8 of the body outlet is very small, so the starting pressure of the Z-type liquid control valve without diaphragm shaft sleeve spring is very small, and the operating conditions of the Z-type liquid control valve without diaphragm shaft sleeve spring are wide.

[0080] 2. The piston inner cavity 7, the body inlet inner cavity 12, and the body outlet inner cavity 8 are connected via pipe I 15, valve I 16, and valve II 57. When liquid flows from the body inlet inner cavity 12 to the body outlet inner cavity 8, valve I 16 on the body inlet inner cavity 12 is opened, and valve II 57 on the body outlet inner cavity 8 is closed. The liquid in the body inlet inner cavity 12 enters the piston inner cavity 7. Since the piston inner cavity 7 and the body outlet inner cavity 8 are not connected, the liquid pressure in the piston inner cavity 7 and the body inlet inner cavity 12 is the same. The liquid pressure entering the body outlet inner cavity 8 is the liquid pressure in the body inlet inner cavity 12 that overcomes the overall weight and tightness of the piston 6 and the vertically fixed connection between the piston 6 and the piston's lower extended end face 13. The inner ring 10 of the sealing ring has elasticity, maintaining contact with the piston outer ring 11. The resistance generated by this friction allows liquid to enter the body outlet cavity 8. Therefore, there is a very small pressure difference between the liquid pressure in the body inlet cavity 12 and the liquid pressure in the body outlet cavity 8. Because the inner ring 10 of the sealing ring has very little elasticity in maintaining contact with the piston outer ring 11, the friction of the piston outer ring 11 in sliding contact is also small. Since the outer ring 11 and the inner ring 10 of the sealing ring are elastically maintained, liquid will not leak into the body outlet cavity 8. Because the area of ​​the outer ring of the piston 6 is larger than the area of ​​the inner ring of the body outlet cavity stop 14, the liquid... When piston 6 is compressed, it will move downwards. As piston 6 moves downwards, the distance between the extended end face 13 below piston and the stop 14 of the body outlet cavity will gradually decrease. The liquid pressure difference between the body inlet cavity 12 and the body outlet cavity 8 will gradually increase. As the liquid pressure gradually increases, the direction of the sealing ring expansion port 48 is affected by the liquid pressure, and the sealing ring 5 will expand with the increase of hydraulic pressure. At this time, the sealing ring 5 tends to expand in the sealing ring groove 4. After the sealing ring 5 expands, a ring-shaped force will be formed between the sealing ring groove 4 and the sealing ring 5, making the plane circle of piston 6 and sealing ring groove 4 tend to be perpendicular, so that the extended end face 13 below piston and the stop 14 of the body outlet cavity are kept at a certain distance. In the parallel position, as the piston 6 continues to descend, the frictional resistance between the inner ring 10 of the sealing ring and the outer ring 11 of the piston in sliding contact due to the expansion of the sealing ring 5 will increase. This will ensure that the piston 6 will not vibrate when the distance between the lower extension end face 13 of the piston and the inner cavity stop 14 of the valve body is close after the piston 6 moves downward. This will allow the valve to achieve a parallel and vibration-free seal between the lower extension end face 13 of the piston and the inner cavity stop 14 of the valve body. Therefore, for the Z-type liquid control valve without diaphragm shaft, bushing, and spring, do not use springs to reset and increase the stability when closing the valve, or diaphragm shaft and bushing to ensure that the lower extension end face 13 and the inner cavity stop 14 of the valve body are parallel and sealed.

[0081] 3. The piston inner cavity 7, the body inlet inner cavity 12, and the body outlet inner cavity 8 are connected via pipe I 15, valve I 16, and valve II 57. When liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, valve I 16 on the body inlet inner cavity 12 is opened, and valve II 57 on the body outlet inner cavity 8 is closed. Liquid in the body outlet inner cavity 8 cannot enter the piston inner cavity 7, but liquid in the piston inner cavity 7 can flow into the valve body inlet inner cavity 12 through pipe I 15 and valve I 16 on the body inlet inner cavity 12. At this time, the liquid pressure in the piston inner cavity 7 and the liquid pressure in the body inlet inner cavity 12 are... Similarly, because the outer ring area of ​​piston 6 is larger than the inner ring area of ​​the stop 14 in the body outlet cavity, as long as the liquid pressure in the body outlet cavity 8 is greater than the liquid pressure in the inlet cavity 12, it can overcome the overall weight of piston 6 and piston lower extension end face 13 vertically fixedly connected and the resistance caused by the friction between the inner ring 10 of the sealing ring and the outer ring 11 of the piston sliding contact seal, piston 6 will be pushed upward by the liquid in the body outlet cavity 8. When piston 6 moves upward, piston lower extension end face 13 leaves the stop 14 in the body outlet cavity, and the body outlet cavity... The liquid in valve 8 flows from the outlet end cavity stop 14 to the inlet end cavity 12, opening the valve. During valve opening, the liquid pressure in the outlet end cavity 8 and the liquid pressure difference in the inlet end cavity 12 gradually approach each other. The direction of the sealing ring expansion port 48 is affected by the liquid pressure, causing the sealing ring 5 to expand and contract as the hydraulic pressure decreases. When the piston 6 moves to a point where the overall weight of the piston 6 and the piston's lower extended end face 13 is vertically fixed, and the resistance caused by the friction between the inner ring 10 of the sealing ring and the outer ring 11 of the piston is large enough to maintain elastic contact and seal, the piston 6 stops moving. Therefore, as long as the pressure of the liquid in the two flow directions is the same, the opening degree of the valve depends on the overall weight of the piston 6 and the piston lower extension end face 13 which are vertically fixed and connected, and the resistance caused by the friction between the inner ring 10 of the sealing ring and the outer ring 11 of the piston in sliding contact. Therefore, the valve can realize the flow from the body outlet end cavity 8 to the body inlet end cavity 12, and the pressure loss of the liquid flowing from the body outlet end cavity 8 to the body inlet end cavity 12 is also small, so that the diaphragmless shaft sleeve spring Z-type liquid control valve can achieve bidirectional flow under the condition of low pressure loss.

[0082] 4. The piston inner cavity 7, the body inlet inner cavity 12, and the body outlet inner cavity 8 are connected via pipe I 15, valve I 16, and valve II 57. When liquid flows from the body outlet inner cavity 8 to the body inlet inner cavity 12, valve I 16 on the body inlet inner cavity 12 is closed, and valve II 57 on the body outlet inner cavity 8 is opened. The liquid in the body outlet inner cavity 8 enters the piston inner cavity 7, while the liquid in the piston inner cavity 7 cannot flow into the valve body inlet inner cavity 12 through pipe I 15 and valve I 16 on 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 outlet inner cavity 8, as long as the piston 6 is perpendicularly and fixedly connected to the piston lower extension end face 13. The overall weight can overcome the resistance caused by the friction between the inner ring 10 of the sealing ring and the outer ring 11 of the piston sliding contact seal, so the piston 6 can move down. Because the inner ring 10 of the sealing ring 5 has very little elasticity when it is not pressurized by liquid, the resistance caused by friction is also small. The piston 6 will move down under its own weight. After the piston 6 moves down, the extended end face 13 below the piston matches the stop 14 of the inner cavity of the body outlet end and seals to cut off the flow of liquid from the inner cavity 8 of the valve body outlet end to the inner cavity 12 of the body inlet end. The valve is closed, realizing that the diaphragmless shaft sleeve spring Z-type liquid control valve can be closed in both directions.

[0083] Example 3 In the aforementioned Z-type liquid control valve without a diaphragm shaft and bushing spring, the sealing ring groove 4 is machined on the top of the cover 1, on the top of the body 3, or on both the cover 1 and the body 3, with one of the three machining methods available. The number of machined sealing ring grooves 4 is one or more. The number of installed sealing rings 5 ​​is the same as the number of machined sealing ring grooves 4 and their models match. The cover 1 and body 3 are sealed together using screws 39 to form a single unit, and the sealing is achieved using a sealing strip 52. Figure 9 , Figure 10 , Figure 11 As shown.

[0084] Example 4 In the aforementioned Z-type liquid control valve without a diaphragm shaft and bushing spring, a seat 2 is added between the cover 1 and the body 3. The sealing ring groove 4 is machined on the top of the seat 2, on the top of the cover 1 and seat 2, on the top of the seat 2 and body 3, on the top of the cover 1, seat 2, and body 3, or on the top of the cover 1 and body 3. One of five machining methods is available. The number of machined sealing ring grooves 4 is one or more. The number of installed sealing rings 5 ​​is the same as the number of machined sealing ring grooves 4 and their models match. The cover 1, seat 2, and body 3 are sealed together as a whole using screws 39, and the sealing is achieved using a sealing strip 52. Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 As shown.

[0085] Example 5 In the aforementioned Z-type liquid control valve without a diaphragm shaft and bushing spring, the sealing ring groove 4 is machined on a type I sealing ring groove seat 46. The number of machined sealing ring grooves 4 is one or more. The number of installed sealing rings 5 ​​is the same as the number of machined sealing ring grooves 4 and matches their model. The type I sealing ring groove seat 46 and the body 3 are sealed together using screws 55 to form a single unit, and the seal is achieved using a sealing strip 52. The cover 1 and the body 3 are sealed together using screws 39 to form a single unit, and the seal is achieved using a sealing strip 52. Figure 17 As shown.

[0086] Example 6 In the aforementioned Z-type liquid control valve without a diaphragm shaft sleeve spring, a type II sealing ring groove seat 47 is added between the cover 1 and the body 3. The sealing ring groove 4 is machined onto the type II sealing ring groove seat 47, with one or more grooves machined. The number of installed sealing rings 5 ​​is the same as the number of machined sealing ring grooves 4 and their models match. The cover 1, the type II sealing ring groove seat 47, and the body 3 are sealed together as a whole using screws 39, and the sealing is achieved using a sealing strip 52. Figure 18 As shown.

[0087] Example 7 The aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve has a stop port 40 above or below the sealing ring groove 4. The ring plane of the stop port 40 is parallel to the ring plane of the sealing ring groove 4, and their center lines are aligned. The upper outward extension portion 41 of the piston 6 or the lower end face 42 of the piston 6 matches and seals with the stop port 40 after the piston 6 moves downward. 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 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 sealed together by screws 39 to form a whole, and the seal is achieved by a sealing strip 52. Figure 19 , Figure 20 As shown.

[0088] Example 8 In the aforementioned Z-type liquid control valve without a diaphragm shaft sleeve spring, a seat 2 is added between the cover 1 and the body 3. A stop port 40 is located on the seat 2. The plane of the stop port 40 is parallel to the plane of the sealing ring groove 4, and their center lines are aligned. The upper outward extension 41 of the piston 6 or the lower end face 42 of the piston 6 seals against the stop port 40 after the piston 6 moves downward. Simultaneously, the lower extension end face 13 of the piston seals against the stop port 14 of the body outlet cavity. 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 cover 1, seat 2, and body 3 are sealed together by screws 39, forming a single unit. The sealing is achieved using a sealing strip 52. Figure 21 , Figure 22 As shown.

[0089] Example 9 In the aforementioned diaphragmless shaft-sleeve spring Z-type liquid control valve, a shaft 44 is mounted on the cover 1 and extends into the piston cavity 7. The shaft 44 is sealed at its contact point with the cover 1, and the shaft 44 can be moved up and down by rotating the handwheel 45. Figure 23 , Figure 24 As shown.

[0090] Further detailed descriptions of Examples 1, 2, 3, 4, 5, 6, 7, 8, and 9: Detailed Explanation 1 In the aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve, when installing the sealing ring 5, the installation direction of the sealing ring 5 should be determined according to the required direction of liquid flow. In conditions where liquid only flows from the inlet cavity 12 to the outlet cavity 8, the sealing ring expansion port 48 should face the piston cavity 7. In conditions where liquid only flows from the outlet cavity 8 to the inlet cavity 12, the sealing ring expansion port 48 should face the opposite direction to the piston cavity 7. In conditions where liquid flows in both directions, the sealing ring 5 facing the piston cavity 7 should have expansion ports 48 in both directions. In conditions where only unidirectional opening and closing of the diaphragmless shaft sleeve spring Z-type liquid control valve is required, one or more sealing rings 5 ​​should be installed. If opening and closing in both directions is required, two or more sealing rings 5 ​​should be installed. By using different machining structures of the sealing ring groove 4 and different assembly methods of the sealing ring 5, the requirements of various operating conditions for the diaphragmless shaft sleeve spring Z-type liquid control valve can be met.

[0091] Specific Explanation 2: When piston 6 and piston lower extension end face 13 are vertically connected and fixed as a whole, the direction of piston inner diameter port 51 of piston 6 facing piston inner cavity 7 or the opposite direction of piston inner cavity 7 can meet the working conditions of diaphragmless shaft bushing spring Z-type liquid control valve.

[0092] Specific Explanation 3: In the aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve, the following is adopted: Figure 17 , Figure 18 The structural design allows for the replacement of the valve's sealing ring seat and piston as a set. If the piston or sealing ring seat is damaged, other components of the diaphragmless shaft sleeve spring Z-type liquid control valve do not need to be replaced. Due to its unique manufacturing and assembly methods, maintenance is extremely convenient, requiring no specialized technicians for replacement. Therefore, the service life of the diaphragmless shaft sleeve spring Z-type liquid control valve can be essentially the same as that of the pipeline.

[0093] Specific Explanation 4: In the aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve, the following is adopted: Figure 19 , Figure 20 , Figure 21 , Figure 22 The structural form allows the valve to achieve a better sealing effect.

[0094] Working principle: 1. For example Figure 19 , Figure 21 As shown, the liquid flows from the inlet end cavity 12 to the outlet end cavity 8. The upper end face of the piston extends outward, and the portion 41 of the piston matches and seals with the stop port 40 after the piston 6 moves downward. At the same time, the lower end face 13 of the piston matches and seals with the stop port 14 of the outlet end cavity, cutting off the flow of liquid from the inlet end cavity 12 to the outlet end cavity 8, and the valve is closed. A stop port 40 is machined above the sealing ring groove 4. When the lower end face 42 of the piston matches and seals with the stop port 40 after the piston 6 moves downward, the liquid in the piston cavity 7 is sealed at this position. Because it is a stop port seal, the stop port seal wear is minimal and will seal better with the increase of use time. Therefore, no leaking liquid will penetrate into the outlet end cavity 8, thus achieving a completely leak-free seal of the valve.

[0095] 2. For example Figure 20 , Figure 22The Z-type liquid control valve shown is a double-stop valve without a diaphragm, shaft, sleeve, and spring. Liquid flows from the inlet cavity 12 to the outlet cavity 8. After the piston 6 moves downward, the lower end face 42 of the piston matches and seals with the stop port 40. At the same time, the lower extended end face 13 of the piston matches and seals with the stop port 14 of the outlet cavity, cutting off the flow of liquid from the inlet cavity 12 to the outlet cavity 8, thus closing the valve. A stop port 40 is machined below the sealing ring groove 4. When the lower end face 42 of the piston matches and seals with the stop port 40 after the piston 6 moves downward, the liquid in the piston cavity 7 is sealed at this position. Because it is a stop port seal, the stop port seal wears very little and will seal better with the increase of use time. Therefore, no leaking liquid will penetrate into the outlet cavity 8, thus achieving a completely leak-free seal for the valve.

[0096] Specific Explanation 5: If you want to adjust the flow rate statically, it's best to use... Figure 23 , Figure 24 The structural form.

[0097] Working principle: like Figure 23 , Figure 24 The Z-type liquid control valve with diaphragmless shaft sleeve spring shown has two installation methods for piston 6: the piston inner diameter port 51 of piston 6 placed in sealing ring 5 faces the piston inner cavity 7 or the opposite direction of piston inner cavity 7; the shaft 44 can be moved up and down by rotating handwheel 45 to move the shaft 44 to a set position. After piston 6 rises, it will be blocked by shaft 44 and cannot rise further. Therefore, the lower extension end face 13 of piston and the stop 14 of body outlet end cavity can be kept at a set fixed opening, limiting the flow rate through the lower extension end face 13 of piston and the stop 14 of body outlet end cavity cavity, thus achieving static flow restriction.

[0098] Example 10 In the aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve, the valve is equipped with an electric actuator 43, which is used to open and close the valve. Figure 25 , Figure 26 As shown.

[0099] Detailed explanation: The valve can be switched on and off using an electric actuator 43. Using an electric actuator 43 to switch the valve on and off instead of manually can realize remote control of the diaphragmless shaft sleeve spring Z-type liquid control valve. Once the power is off, the actuator 43 can be removed and the valve can be switched on and off using ordinary tools.

[0100] Example 11 The aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve is a one-way single-stop valve. The piston inner cavity 7 is connected to a three-way valve 17 via pipe I15. One outlet of the three-way valve 17 is connected to the valve body inlet inner cavity 12 via pipe I15, and the other outlet is connected to the valve body outlet inner cavity 8 via pipe I15. Figure 27 As shown.

[0101] Specific explanation: This embodiment can use any one of the basic structures, the processing form of the sealing ring groove, and the sealing ring assembly structure of the present invention to assemble pipes and valves, such as... Figure 27 As shown.

[0102] Working principle: 1. When the liquid flows from the inlet cavity 12 to the outlet cavity 8, the three-way ball valve 17 is switched to the position where the piston cavity 7 and the inlet cavity 12 are closed, and the piston cavity 7 and the outlet cavity 8 are open. The liquid in the inlet cavity 12 cannot enter the piston cavity 7 through pipe I 15 and the three-way ball valve 17, but the liquid in the piston cavity 7 can enter the outlet cavity 8 through the three-way ball valve 17 and pipe I 15. At this time, the piston 6 is not under pressure, and the extended end face 13 below the piston leaves the outlet cavity stop 14 under the push of the liquid in the inlet cavity 12. The liquid in the inlet cavity 12 enters the outlet cavity 8 through the outlet cavity stop 14. The valve is opened; the three-way ball valve 17 is switched to the position where the piston inner cavity 7 and the body inlet inner cavity 12 are open, and the piston inner cavity 7 and the body outlet inner cavity 8 are closed. The liquid in the body inlet inner cavity 12 enters the piston inner cavity 7 through the pipe I 15 and the three-way ball valve 17. At the same time, the liquid in the piston inner cavity 7 cannot enter the body outlet inner cavity 8 through the three-way ball valve 17 and the pipe I 15. 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 moves downward under pressure. After the piston 6 moves downward, the lower extension end face 13 of the piston matches and seals the body outlet inner cavity stop 14, cutting off the liquid flowing from the body inlet inner cavity 12 to the body outlet inner cavity 8, and the valve is closed.

[0103] 2. When liquid flows from the outlet cavity 8 to the inlet cavity 12, the three-way ball valve 17 is switched to the closed position of the piston cavity 7 and the inlet cavity 12, and the piston cavity 7 and the outlet cavity 8 are opened. Liquid in the outlet cavity 8 enters the piston cavity 7 through pipe I 15 and the three-way ball valve 17. At the same time, liquid in the piston cavity 7 cannot enter the inlet cavity 12 of the valve body through the three-way ball valve 17 and pipe I 15. When the liquid pressure in the piston cavity 7 is the same as the liquid pressure in the outlet cavity 8, the piston 6 moves downward under its own weight. After the piston 6 moves downward, the extended end face 13 below the piston matches the stop 14 of the outlet cavity, sealing and cutting off the liquid flowing from the outlet cavity 8 to the inlet cavity 12. Close; Set the three-way ball valve 17 to the open position between the piston inner cavity 7 and the body inlet inner cavity 12, and close the piston inner cavity 7 and the body outlet inner cavity 8. The liquid in the body outlet inner cavity 8 cannot enter the piston inner cavity 7 through the pipe I 15 and the three-way ball valve 17. At the same time, the liquid in the piston inner cavity 7 enters the body inlet inner cavity 12 through the three-way ball valve 17 and the pipe I 15. 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. When the piston 6 moves upward, the extended end face 13 below the piston leaves the body outlet inner cavity stop 14. The liquid in the body outlet inner cavity 8 flows to the body inlet inner cavity 12 through the body outlet inner cavity stop 14, and the valve opens.

[0104] 3. Specific explanation: When the liquid flows from the inlet end cavity 12 to the outlet end cavity 8, or when the liquid flows from the outlet end cavity 8 to the inlet end cavity 12, after operating the three-way ball valve 17, the liquid flow direction can only be in one direction and not in the other direction. Therefore, it only has the function of one-way flow and one-way flow blocking.

[0105] Example 12 The aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve is a one-way double shut-off valve. The piston inner 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 valve body inlet inner cavity 12 via pipe I 15 and check valve 18, while the other outlet is connected to the valve body outlet inner cavity 8 via pipe I 15. Figure 28 As shown.

[0106] Specific explanation: In this embodiment, any one of the structures described in this invention can be used to assemble pipes and valves while adhering to the principles of this invention, such as... Figure 28 As shown.

[0107] 1. When liquid flows from the inlet cavity 12 to the outlet cavity 8, the three-way ball valve 17 is switched to the position where the piston cavity 7 and the inlet cavity 12 are closed, and the piston cavity 7 and the outlet cavity 8 are open. Liquid in the inlet cavity 12 cannot enter the piston cavity 7 through pipe I 15, check valve 18, and three-way ball valve 17. At the same time, liquid in the piston cavity 7 can enter the outlet cavity 8 through three-way ball valve 17 and pipe I 15. At this time, the piston 6 is not under pressure. The extended end face 13 below the piston leaves the valve body outlet cavity stop 14 under the push of the liquid in the inlet cavity 12. Liquid in the inlet cavity 12 enters the outlet cavity 8 through the outlet cavity stop 14. Open; Set the three-way ball valve 17 to the open position between the piston inner cavity 7 and the body inlet inner cavity 12, and close the piston inner cavity 7 and the valve body outlet inner cavity 8. The liquid in the body inlet inner cavity 12 enters the piston inner cavity 7 through the pipe I 15, check valve 18, and three-way ball valve 17. At the same time, the liquid in the piston inner cavity 7 cannot enter the body outlet inner cavity 8 through the three-way ball valve 17 and the pipe I 15. 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 moves downward under pressure. After the piston 6 moves downward, the lower extension end face 13 of the piston matches and seals the body outlet inner cavity stop 14, cutting off the liquid flowing from the body inlet inner cavity 12 to the body outlet inner cavity 8, and the valve closes.

[0108] 2. When the liquid flows from the outlet cavity 8 to the inlet cavity 12, the three-way ball valve 17 is switched to the closed position between the piston cavity 7 and the inlet cavity 12, and the piston cavity 7 and the outlet cavity 8 are opened. The liquid in the outlet cavity 8 enters the piston cavity 7 through pipe I 15 and the three-way ball valve 17. At the same time, the liquid in the piston cavity 7 cannot enter the inlet cavity 12 through the three-way ball valve 17, the check valve 18, and pipe I 15. When the liquid pressure in the piston cavity 7 is the same as the liquid pressure in the outlet cavity 8, the piston 6 moves downward under its own weight. The extended end face 13 below the piston moves with the piston 6. After descending, the liquid flows from the outlet cavity 8 to the inlet cavity 12, sealing and cutting off the flow of liquid from the outlet cavity 8 to the inlet cavity 12. The valve is closed. When the three-way ball valve 17 is in the open position between the piston cavity 7 and the inlet cavity 12, the piston cavity 7 and the outlet cavity 8 are closed. The liquid in the outlet cavity 8 cannot enter the piston cavity 7 through pipe I 15 and three-way ball valve 17. At the same time, the liquid in the piston cavity 7 cannot enter the inlet cavity 12 through three-way ball valve 17, check valve 18 and pipe I 15. Therefore, the piston 6 will not move under pressure, and the valve cannot be opened. Thus, the purpose of one-way flow and two-way flow blocking is achieved.

[0109] Example 13 The aforementioned Z-type liquid control valve, which is a diaphragmless shaft sleeve spring check valve and shut-off valve, connects piston inner cavity 7 to inlet inner cavity 12 via pipe I15 and inlet two-way valve I19, and piston inner cavity 7 to outlet inner cavity 8 via pipe I15 and outlet two-way valve II20. Figure 29 As shown.

[0110] Specific explanation: In this embodiment, any one of the structures described in this invention can be used to assemble pipes and valves while adhering to the principles of this invention, such as... Figure 29 As shown.

[0111] Working principle: 1. When the liquid flows from the inlet cavity 12 to the outlet 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 inlet cavity 12 cannot flow into the piston cavity 7, but the liquid in the piston cavity 7 can flow into the outlet cavity 8 through the pipe I 15 and the outlet two-way valve II 20. At this time, the piston 6 will not be pressurized, and the extended end face 13 below the piston will leave the outlet cavity stop 14 under the push of the liquid in the inlet cavity 12. The liquid in the inlet cavity 12 enters the outlet cavity 8 through the outlet cavity stop 14. In cavity 8, the valve is open. When liquid flows from the outlet cavity 8 to the inlet cavity 12, the liquid pressure in the piston cavity 7 depends on the amount of liquid entering the piston cavity 7 from the outlet cavity 8. When the liquid pressure in the piston cavity 7 is the same as the liquid pressure in the 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 the stop 14 of the outlet cavity and seals, cutting off the flow of liquid from the outlet cavity 8 to the inlet cavity 12. The valve is closed, achieving the purpose of check valve.

[0112] 2. When the liquid flows from the outlet cavity 8 to the inlet 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 outlet cavity 8 cannot flow into the piston cavity 7, but the liquid in the piston cavity 7 can flow into the valve body inlet 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 outlet cavity stop 14, the piston 6 is pushed upward by the liquid in the outlet cavity 8. The lower extension end face 13 of the piston leaves the outlet cavity stop 14 when the piston 6 moves upward. The liquid in the outlet cavity 8 flows through the outlet cavity stop 14 to... In the inlet cavity 12, the valve is open. When the liquid flows from the inlet cavity 12 to the outlet cavity 8, the liquid pressure in the piston cavity 7 depends on the amount of liquid entering the piston cavity 7 from the inlet cavity 12. When the pressure in the piston cavity 7 is the same as that in the inlet cavity 12, because the outer ring area of ​​the piston 6 is larger than the inner ring area of ​​the outlet cavity stop 14, the piston 6 will move downward under the action of the liquid pressure. After the piston 6 moves downward, the extended end face 13 below the piston matches the valve body outlet cavity stop 14 to seal and cut off the liquid flow from the inlet cavity 12 to the outlet cavity 8, and the valve is closed to achieve the purpose of check valve.

[0113] 3. Specific explanation: When the liquid flows from the inlet end cavity 12 to the outlet end cavity 8, or when the liquid flows from the outlet end cavity 8 to the inlet end cavity 12, operate the inlet end two-way valve I 19 and the outlet end two-way valve II 20 to open one of the two-way valves and close the other two-way valve. There will be a liquid flow direction that is closed, so it has the function of check flow and flow cut-off.

[0114] Example 14 The aforementioned Z-type liquid control valve without diaphragm shaft sleeve spring is a bidirectional single-stop valve. The piston inner cavity 7 is connected to the inlet inner cavity 12 via pipe I15, inlet two-way valve I19, and semi-closed check valve 34. The piston inner cavity 7 is connected to the outlet inner cavity 8 via pipe I15, outlet two-way valve II20, and semi-closed check valve 34. (The last sentence appears to be incomplete and possibly a fragment from another context.) Figure 30 As shown.

[0115] Specific explanation: In this embodiment, any one of the structures described in this invention can be used to assemble pipes and valves while adhering to the principles of this invention, such as... Figure 30 As shown.

[0116] Working principle: 1. When liquid flows from the inlet cavity 12 to the outlet 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 pipe I 15 in the inlet cavity 12 is half-closed, and the semi-closed check valve 34 installed on pipe I 15 in the outlet cavity 8 is fully open. The liquid in the inlet cavity 12 enters the piston cavity 7 through pipe I 15, the semi-closed check valve 34, the inlet two-way valve I 19, and pipe I 15. Because the semi-closed check valve 34 installed on pipe I 15 in the outlet cavity 8 is fully open, the amount of liquid entering the piston cavity 7 is less than the amount flowing to the outlet cavity 8. Therefore, the piston 6 is not under pressure. The extended end face 13 below the piston leaves the outlet cavity stop 14 under the push of the liquid in the inlet cavity 12. The liquid in the inlet cavity 12 passes through the body... The outlet end stop 14 enters the outlet end inner cavity 8 of the body, and 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 I 15 of the inlet end inner cavity 12 of the valve body is only partially closed, not completely closed. The liquid in the inlet end inner cavity 12 of the body can enter the piston inner cavity 7 through the semi-closed check valve 34, the inlet two-way valve I 19, and the pipe I 15. Because the outlet two-way valve II 20 is closed, the liquid in the inlet end inner cavity 12 of the body cannot flow to the outlet end inner cavity 8 of the body. The outer ring area of ​​the piston 6 is larger than the inner ring area of ​​the outlet end inner cavity stop 14 of the body. The piston 6 moves downward under pressure. After the piston 6 moves downward, the extended end face 13 below the piston matches and seals the outlet end inner cavity stop 14 of the body after the piston 6 moves downward, cutting off the liquid flowing from the inlet end inner cavity 12 of the body to the outlet end inner cavity 8 of the body, and the valve is closed.

[0117] 2. When liquid flows from the outlet cavity 8 to the inlet cavity 12, the inlet two-way valve I19 and the outlet two-way valve II20 are opened. At this time, the semi-closed check valve 34 installed on the pipe I15 of the outlet cavity 8 is half closed, and the semi-closed check valve 34 installed on the pipe I15 of the inlet cavity 12 is fully open. The liquid in the outlet cavity 8 enters the piston cavity 7 through the pipe I15, the semi-closed check valve 34, the outlet two-way valve II20, and the pipe I15. Because the semi-closed check valve 34 installed on the pipe I15 of the inlet cavity 12 is fully open, the amount of liquid entering the piston cavity 7 is less than the amount flowing into the inlet cavity 12. Because the outer ring area of ​​the piston 6 is larger than the inner ring area of ​​the outlet cavity stop 14, the piston 6 is pushed upward by the liquid in the outlet cavity 8. The extended end face 13 below the piston leaves the outlet cavity stop 14 when the piston 6 moves upward. The liquid in cavity 8 flows through the outlet end cavity stop 14 to the inlet end cavity 12, and the valve opens. The inlet two-way valve I 19 is closed, and the outlet two-way valve II 20 is opened. At this time, the semi-closed check valve 34 installed on the pipe I 15 of the outlet end cavity 8 of the valve body is only partially closed, not completely closed. This allows the liquid in the outlet end cavity 8 of the valve body to enter the piston cavity 7 through pipe I 15, the semi-closed check valve 34, the outlet two-way valve II 20, and pipe I 15. Because the inlet two-way valve I 19 is closed, the liquid in the outlet end cavity 8 of the valve body cannot flow from the piston cavity 7 to the inlet end cavity 12. When the liquid pressure in the piston cavity 7 is the same as the liquid pressure in the outlet end 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 the outlet end cavity stop 14 and seals, cutting off the flow of liquid from the outlet end cavity 8 to the inlet end cavity 12 of the valve body, and the valve closes.

[0118] 3. Specific explanation: When the liquid flows from the inlet end cavity 12 to the outlet end cavity 8, or when the liquid flows from the outlet end cavity 8 to the inlet end cavity 12, the inlet end two-way valve I 19 and the outlet end two-way valve II 20 are opened, and the liquid can pass through the valve in both directions. Closing one of the two-way valves can close the liquid flow in one direction. Therefore, the valve has the functions of allowing liquid to pass through in both directions and unidirectional flow control.

[0119] Example 15 The aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve is a bidirectional double-stop valve. The piston inner cavity 7 is connected to a three-way valve I21 via a two-way valve IV36. Each of the two outlets of three-way valve I21 is equipped with a check valve 18. The outlet of one check valve 18 is connected to the inlet cavity 12 of the body via pipe I15, and the outlet of the other check valve 18 is connected to the outlet cavity 8 of the body via pipe I15. The piston inner cavity 7 is connected to a three-way valve II22 via a two-way valve V37. Each of the two outlets of three-way valve II22 is equipped with a check valve 18. The outlet of one check valve 18 is connected to the inlet cavity 12 of the body via pipe I15, and the outlet of the other check valve 18 is connected to the outlet cavity 8 of the body via pipe I15. (The last sentence is incomplete and likely refers to a different valve configuration.) Figure 31 As shown.

[0120] Specific explanation: In this embodiment, any one of the structures described in this invention can be used to assemble pipes and valves while adhering to the principles of this invention, such as... Figure 31 As shown.

[0121] Working principle: 1. When liquid flows from the inlet cavity 12 to the outlet cavity 8, close the two-way valve IV 36 and open the two-way valve V 37. In this state, the two-way valve IV 36 disconnects the liquid from the inlet cavity 12 and outlet cavity 8 connected by the three-way valve I 21, preventing the liquid from entering the piston cavity 7. The two-way valve V 37 is open. The three-way valve II 22 connected to the two-way valve V 37 is connected to the inlet cavity 12 via the check valve 18 and pipe I 15. However, the check valve 18 prevents the liquid from flowing back into the inlet cavity 12, so the liquid in the inlet cavity 12 cannot enter the piston cavity 7. The two-way valve V 37 is open. In the first state, the three-way valve II 22 connected to the two-way valve V37, via check valve 18 and pipe I 15, connects to the check valve 18 in the inner cavity 8 of the body outlet. This prevents the liquid from flowing back from the piston inner cavity 7. Therefore, the liquid in the piston inner cavity 7 can flow through the two-way valve V37, three-way valve II 22, check valve 18, and pipe I 15 into the inner cavity 8 of the body outlet. At this time, the piston 6 is not under pressure. The extended end face 13 below the piston is pushed away from the stop port 14 of the inner cavity 12 of the body outlet by the liquid in the inner cavity 12 of the body inlet. The liquid in the inner cavity 12 of the body inlet enters the inner cavity 8 of the body outlet through the stop port 14 of the inner cavity 12 of the body outlet, and the valve opens.

[0122] 2. When the liquid flows from the outlet cavity 8 to the inlet cavity 12, close the two-way valve IV 36 and open the two-way valve V 37. In this state, the two-way valve IV 36 disconnects the liquid from the inlet cavity 12 and outlet cavity 8 connected by the three-way valve I 21, preventing the liquid from entering the piston cavity 7. The two-way valve V 37 is open, and the three-way valve II 22 connected to the two-way valve V 37 is connected to the outlet cavity 8 via the check valve 18 and pipe I 15. However, the check valve 18 prevents the liquid from flowing back into the outlet cavity 8, so the liquid in the outlet cavity 8 cannot enter the piston cavity 7. The two-way valve V 37 is open, and the three-way valve II 22 connected to the two-way valve V 37 is connected to the outlet cavity 8 via the check valve I 15. 18. The check valve 18 of the inlet end cavity 12 connected to the pipe I 15 prevents the liquid from flowing back from the piston inner cavity 7. Therefore, the liquid in the piston inner cavity 7 can flow into the inlet end cavity 12 through the two-way valve V 37, the three-way valve II 22, the check valve 18, and the pipe I 15. Since the outer ring area of ​​the piston 6 is larger than the inner ring area of ​​the stop port 14 of the outlet end cavity, the piston 6 is pushed upward by the liquid in the outlet end cavity 8. When the piston 6 moves upward, the extended end face 13 below the piston leaves the stop port 14 of the outlet end cavity. The liquid in the outlet end cavity 8 flows into the inlet end cavity 12 through the stop port 14 of the outlet end cavity, and the valve opens.

[0123] 3. When the liquid flows from the inlet cavity 12 to the outlet cavity 8, open the two-way valve IV 36 and close the two-way valve V 37. In this state, the two-way valve V 37 disconnects the liquid from the inlet cavity 12 and outlet cavity 8 connected by the three-way valve II 22, preventing the liquid from entering the piston cavity 7. The two-way valve IV 36 is open, and the three-way valve I 21 connected to the two-way valve IV 36 is connected to the outlet cavity 8 via the check valve 18 and pipe I 15. However, the check valve 18 prevents the liquid in the piston cavity 8 from flowing back, so the liquid in the inlet cavity 12 cannot enter the outlet cavity 8. The two-way valve IV 36... 6 is in the open state. The three-way valve I21 connected to the two-way valve IV36 is connected to the body inlet cavity 12 via check valve 18 and pipe I15. However, check valve 18 does not allow the liquid in the body inlet cavity 12 to flow back. Therefore, the liquid in the body inlet cavity 12 can enter the piston cavity 7. Since the outer ring area of ​​piston 6 is larger than the inner ring area of ​​the body outlet cavity stop 14, piston 6 moves downward under pressure. After piston 6 moves downward, the extended end face 13 below piston matches and seals the body outlet cavity stop 14, cutting off the liquid flowing from the body inlet cavity 12 to the body outlet cavity 8, and the valve is closed.

[0124] 4. When the liquid flows from the outlet cavity 8 to the inlet cavity 12, open the two-way valve IV 36 and close the two-way valve V 37. In this state, the two-way valve V 37 disconnects the liquid from the inlet cavity 12 and outlet cavity 8 connected by the three-way valve II 22, preventing the liquid from entering the piston cavity 7. The two-way valve IV 36 is open. The three-way valve I 21 connected to the two-way valve IV 36 is connected to the inlet cavity 12 via the check valve 18 and pipe I 15. However, the check valve 18 prevents the liquid in the piston cavity 7 from flowing back, so the liquid in the outlet cavity 8 cannot enter the inlet cavity 12. The two-way valve IV 36... 6 is in the open state. The three-way valve I21 connected to the two-way valve IV36 is connected to the body outlet cavity 8 via check valve 18 and pipe I15. However, check valve 18 does not allow the liquid in the body outlet cavity 8 to flow back. Therefore, the liquid in the body outlet cavity 8 can enter the piston cavity 7. When the liquid pressure in the piston cavity 7 is the same as 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 extended end face 13 below the piston matches the stop 14 of the body outlet cavity and seals off the liquid flowing from the body outlet cavity 8 to the body inlet cavity 12, and the valve is closed.

[0125] 5. Specific Explanation: When liquid flows from the inlet cavity 12 to the outlet cavity 8, or from the outlet cavity 8 to the inlet cavity 12, closing the two-way valve IV 36 and opening the two-way valve V 37 allows fluid to flow in both directions; opening the two-way valve IV 36 and closing the two-way valve V 37 allows the valve to be closed in both directions. Therefore, the valve has the function of allowing liquid to pass through the valve in both directions and blocking flow in both directions.

[0126] Example 16 The aforementioned Z-type liquid control valve with float valve and no diaphragm shaft sleeve spring has a piston inner cavity 7 connected to the body inlet inner cavity 12 via pipe I 15 and inlet two-way valve I 19. The piston inner cavity 7 is connected to the float valve 23 via outlet two-way valve II 20 and pipe I 15. The body outlet inner cavity flange 24 is connected to pipe II 25 to the liquid pool 26. Figure 32 As shown.

[0127] Specific explanation: In this embodiment, any one of the structures described in this invention can be used to assemble pipes and valves while adhering to the principles of this invention, such as... Figure 32 As shown.

[0128] Working principle: Liquid flows from the inlet cavity 12 to the outlet cavity 8. The inlet two-way valve I 19 and the outlet two-way valve II 20 are opened, with the opening of the inlet two-way valve I 19 being smaller than that of the outlet two-way valve II 20. The liquid in the inlet cavity 12 enters the piston cavity 7 through 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, pipe I 15, and float valve 23. At this time, the piston 6 is not under pressure. The extended end face 13 below the piston leaves the outlet cavity stop 14 under the push of the liquid in the inlet cavity 12. The liquid in the inlet cavity 12 enters the outlet cavity 8 through the outlet cavity stop 14, and then flows through the outlet... Pipe II 25, connected to the inner flange 24, enters the liquid pool 26. When the liquid in the liquid pool 26 rises to the float valve 23, the float valve 23 closes. The liquid in the inner cavity 12 of the body inlet enters the inner cavity 7 of the piston through the inlet two-way valve I 19 and pipe I 15. After that, it cannot enter the air in the liquid pool 26 through the outlet two-way valve II 20, pipe I 15, and float valve 23. Because the outer ring area of ​​the piston 6 is larger than the inner ring area of ​​the inner stop 14 of the body outlet, the piston 6 moves downward under pressure. After the piston 6 moves downward, the extended end face 13 below the piston matches and seals the inner stop 14 of the body outlet after the piston 6 moves downward, cutting off the liquid flowing from the inner cavity 12 of the body inlet to the inner cavity 8 of the body outlet, and the valve closes.

[0129] Example 17 The aforementioned Z-type liquid control valve without diaphragm shaft sleeve spring is a flow limiting valve and check valve. The piston inner cavity 7 is connected to one outlet of the three-way pilot valve I27 via check valve 18 and pipe I 15. The other outlet of the three-way pilot valve I27 is connected to the liquid inlet 28 of pump 35 via pipe I 15. The inlet of the three-way pilot valve I27 is connected to the inner cavity 12 of the body via pipe I 15 and inlet two-way valve I 19. There is a handwheel 29 on the three-way pilot valve I27. The piston inner cavity 7 is connected to the inner cavity 8 of the body via pipe I 15 and outlet two-way valve II 20, as shown in 33.

[0130] In this embodiment, the three-way pilot valve I27 is a handwheel three-way pilot valve.

[0131] Specific description: In this embodiment, any one of the structures described in this invention can be used to assemble the pipes, valves, and pilot valves while adhering to the principles of this invention. Figure 33 As shown.

[0132] Working principle: 1. Start pump 35. Liquid flows from the inlet end cavity 12 to the outlet end cavity 8. Open the inlet two-way valve I 19 and the outlet two-way valve II 20. Set the opening of the inlet two-way valve I 19 to be less than the opening of the outlet two-way valve II 20. At this time, piston 6 will not be compressed. The extended end face 13 below the piston will leave 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 will enter the outlet end cavity 8 through the outlet end cavity stop 14, and the valve will open. Adjusting the handwheel 29 can make the liquid in the inlet end 28 of pump 35... The flow rate of liquid entering the three-way pilot valve I27 through pipe I15 and check valve 18 into the piston cavity 7 ensures that the pressure in the valve body outlet cavity 8 is at a set value. When the liquid flow rate in the pump 35 inlet 28 changes, the sensing module in the three-way pilot valve I27 controls the amount of liquid entering the piston cavity 7 through pipe I15 and check valve 18, thereby changing the opening of the piston 6. This ensures that the pressure in the valve body outlet cavity 8 does not change with the liquid flow rate in the pump 35 inlet 28, achieving the purpose of flow restriction.

[0133] 2. When pump 35 is turned off, liquid flows from the outlet cavity 8 to the inlet cavity 12. Because check valve 18 prevents backflow into piston cavity 7, the liquid in piston cavity 7 will not flow into inlet cavity 12 via check valve 18, pipe I 15, three-way pilot valve I 27, and inlet two-way valve I 19. It will also not flow into pump 35 via pipe I 15. Liquid in outlet cavity 8 enters piston cavity 7 via outlet two-way valve II 20 and pipe I 15. When the liquid pressure in piston cavity 7 is the same as the liquid pressure in outlet cavity 8, piston 6 moves downward under its own weight. After piston 6 moves downward, the extended end face 13 below piston matches the stop 14 of outlet cavity, sealing and cutting off the liquid flowing from outlet cavity 8 to inlet cavity 12. The valve is closed, achieving the purpose of check valve.

[0134] Example 18 The aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve pressure reducing and stabilizing valve has a piston inner cavity 7 connected to one 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 inner cavity 8 of the connecting body via the outlet two-way valve II 20 and pipe I 15. The piston inner cavity 7 is connected to the inlet inner cavity 12 of the connecting body via pipe I 15 and inlet two-way valve I 19. A screw 31 is located at the top of the two-way pilot valve 30. Figure 34 As shown.

[0135] Specific description: In this embodiment, any one of the structures described in this invention can be used to assemble the pipes, valves, and pilot valves while adhering to the principles of this invention. Figure 34 As shown.

[0136] Working principle: Liquid flows from the inlet cavity 12 to the outlet cavity 8. The inlet two-way valve I 19 and the outlet two-way valve II 20 are opened, with the opening of the inlet two-way valve I 19 less than the opening of the outlet two-way valve II 20. At this time, the piston 6 is not under pressure. The extended end face 13 below the piston is pushed away from the outlet cavity stop 14 by the liquid in the inlet cavity 12. The liquid in the inlet cavity 12 enters the outlet cavity 8 through the outlet cavity stop 14, and the valves open. The two-way pilot valve 3 is then adjusted. The screw 31 on the piston can set the flow rate of liquid in the piston cavity 7 into the body outlet cavity 8 through the two-way valve II 20 to a certain 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 module in the two-way pilot valve 30 will control the amount of flow from the piston cavity 7 into the body outlet cavity 8, so that the opening of the piston 6 changes with the liquid pressure in the body outlet cavity 8, thereby achieving the purpose of pressure reduction and stabilization.

[0137] Example 19 The aforementioned diaphragmless shaft sleeve spring Z-type liquid control valve pressure relief valve has a piston inner cavity 7 connected to one outlet of a 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 inner cavity 8 via an outlet two-way valve II 20 and pipe I 15. The body inlet inner cavity 12 is connected to the inlet of the three-way pilot valve II 32 via an inlet two-way valve I 19 and pipe I 15. The piston inner cavity 7 is connected to the body outlet inner cavity 8 via a two-way valve III 33 and pipe I 15. A screw 31 is located at the top of the three-way pilot valve II 32. Figure 35 As shown.

[0138] Specific description: In this embodiment, any one of the structures described in this invention can be used to assemble the pipes, valves, and pilot valves while adhering to the principles of this invention. Figure 35 As shown.

[0139] Working principle: 1. Liquid flows from the outlet cavity 8 to the inlet cavity 12. The inlet two-way valve I19, outlet two-way valve II20, and two-way valve III33 are opened. Liquid in the outlet cavity 8 enters the piston cavity 7 via pipe I15 and two-way valve III33, and then enters the three-way pilot valve II32 via pipe I15 and outlet two-way valve II20. The top screw 31 of the three-way pilot valve II32 is adjusted to a certain position. When the pressure in the outlet cavity 8 reaches the set value, the liquid pressure in the outlet cavity 8 will enter the three-way pilot valve II32 via pipe I15 and outlet two-way valve II20. This opens the pipeline connecting the three-way pilot valve II32 to pipe I15 and inlet two-way valve I19, connecting the piston cavity 7 via the pipeline. The pipeline from I15 to the three-way pilot valve II32 discharges the liquid in the piston cavity 7 into the body inlet cavity 12. The amount of liquid entering the piston cavity 7 from the body outlet cavity 8 via pipeline I15 and two-way valve III33 is set to be less than the amount of liquid discharged from the piston cavity 7 into the body inlet cavity 12. Because the outer ring area of ​​the piston 6 is larger than the inner ring area of ​​the body outlet cavity stop 14, the piston 6 is pushed upward by the liquid in the body outlet cavity 8. When the piston 6 moves upward, the extended end face 13 below the piston leaves the body outlet cavity stop 14. The liquid in the body outlet cavity 8 flows through the body outlet cavity stop 14 into the body inlet cavity 12, and the valve opens to achieve the purpose of depressurization.

[0140] 2. When the liquid pressure in the valve body outlet cavity 8 is lower than the set value, the liquid pressure in the valve body outlet cavity 8, through pipe I15 and outlet two-way valve II20, enters the three-way pilot valve II32. This liquid pressure cannot open the pipe connecting pipe I15 and inlet two-way valve I19, or the pipe connecting piston cavity 7 through pipe I15 into three-way pilot valve II32. Therefore, the liquid in piston cavity 7 cannot be discharged into valve body inlet cavity 12. However, the liquid in valve body outlet cavity 8 can enter piston cavity 7 through pipe I15 and two-way valve III33. When the liquid pressure in piston cavity 7 is the same as the liquid pressure in valve body outlet cavity 8, piston 6 moves downward under its own weight. After piston 6 moves downward, the lower extension end face 13 of piston matches the stop 14 of valve body outlet cavity, sealing and cutting off the liquid flowing from valve body outlet cavity 8 to valve body inlet cavity 12. The valve closes and no longer releases pressure.

[0141] The above embodiments should be understood as being used only to illustrate the present invention more clearly, and not to limit the scope of the present invention. After reading the present invention, any modifications of the present embodiments by those skilled in the art will fall within the scope defined by the appended claims.

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 and sliding 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 seal with the outer ring (11) of the piston. The outer ring (9) and the inner ring (10) of the sealing ring have elasticity to maintain contact and seal. Once sealed, When the direction of the expansion port (48) of the sealing ring is pressurized by the liquid, the sealing ring (5) will expand and contract with the increase and decrease of the hydraulic pressure. If the expansion port (48) of the sealing ring is pressurized by the hydraulic pressure in the opposite direction, the sealing ring (5) will not expand and contract with the increase and decrease of the hydraulic pressure. The sealing ring (5) is installed in the sealing ring groove (4). There are two sealing rings (5). Among the two sealing rings (5), the direction of the expansion port (48) of the sealing ring near the inner cavity stop (14) of the body outlet is towards the inner cavity of the piston (7), and the direction of the expansion port (48) of the sealing ring near the cover (1) is towards the opposite direction of the inner cavity of the piston (7). 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 inlet end cavity (12) to the outlet end cavity (8), the valve I (16) on the side of the inlet end cavity (12) is opened and the valve II (57) on the side of the outlet end cavity (8) is closed. The liquid in the inlet end cavity (12) enters the piston cavity (7). The piston cavity (7) and the outlet end cavity (8) are not connected. The liquid pressure in the piston cavity (7) and the inlet end cavity (12) of the valve body is the same. After the piston (6) is pressed, it moves downward. When the piston (6) moves downward, the distance between the lower extension end face (13) of the piston and the stop (14) of the outlet end cavity will gradually approach. The liquid pressure difference between the inlet end cavity (12) and the outlet end cavity (8) will gradually increase. The lower extension end face (13) of the piston and the stop (14) of the outlet end cavity will match and seal, cutting off the flow of liquid from the inlet end cavity (12) to the outlet end cavity (8) of the valve body. The valve is closed. 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) can flow into the valve body inlet cavity (12) through the pipe I (15) and the valve I (16) on the 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 valve body inlet cavity (12) through pipe I (15) and valve I (16) on the 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 body outlet cavity stop (14) after the piston (6) moves downward, cutting off the flow of liquid from the valve 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 sealing ring (5) has a circular plane and a V-shaped cross-section (50), the piston (6) has a circular plane and a U-shaped cross-section (56), and the outlet end inner cavity stop (14) has a circular plane. The inner diameter of the outlet cavity stop (14) 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 outlet cavity stop (14) 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). The piston (6) and the lower extension end face (13) of the piston are vertically connected and fixed as a whole. The piston has a sealing surface I (38) on the extended end face (13) below the piston. The sealing of the outer ring (9) and the sealing groove (4) means that the outer ring (9) of the sealing ring has elasticity to keep in contact with the sealing groove (4). The static sealing and sliding sealing of the inner ring (10) of the sealing ring and the outer ring (11) of the piston means that the inner ring (10) of the sealing ring has elasticity to keep in contact with the outer ring (11) of the piston. The outer ring (9) and the inner ring (10) of the sealing ring have elasticity. 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 groove (4). The direction of the sealing ring expansion port (48) is towards the piston cavity (7) or towards the opposite direction of the piston 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 one or more, 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 the body (3) are sealed and connected together and fixed together as a whole by fasteners, and the sealing is achieved by sealing strip (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 type I sealing ring groove seat (46). The number of the sealing ring groove (4) is one or more. The number of the sealing rings (5) installed is the same as the number of the sealing ring grooves (4) and the model is matched. The type I sealing ring groove seat (46) and the body (3) are sealed and fixed together as a whole by fasteners. The sealing is achieved by sealing strip (52). The cover (1) and the body (3) are sealed and fixed together as a whole by fasteners. 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 type II 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 type II sealing ring groove seat (47). The number of the sealing ring groove (4) is one or more. The number of the sealing rings (5) installed is the same as the number of the sealing ring grooves (4) and the models are matched. The sealing connection between the cover (1), the type II 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: 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).

7. 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 via a pipe; preferably, the valve is equipped with an electric actuator (43), which performs valve opening and closing.

8. 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.

9. The diaphragmless shaft sleeve spring Z-type liquid control valve according to any one of claims 1-8, 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).

10. The diaphragmless shaft sleeve spring Z-type liquid control valve according to any one of claims 1-8, 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).

11. The diaphragmless shaft sleeve spring Z-type liquid control valve according to any one of claims 1-8, 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 valve body inlet cavity (12) via pipe I (15), and the outlet of the other check valve (18) is connected to the valve body outlet cavity (8) via pipe I (15).

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