CN115013584A - Shut-off valve - Google Patents

Abstract

The invention belongs to the technical field of valves, and particularly relates to a stop valve which comprises a valve body, a valve core, a piston and a switch assembly, wherein a containing cavity is arranged in the valve body, the containing cavity comprises a liquid inlet section and a liquid outlet section which are mutually communicated, the valve body is provided with a liquid inlet, a liquid outlet and a liquid passing port, the liquid inlet is communicated with the liquid inlet section, the liquid outlet and the liquid passing port are respectively communicated with the liquid outlet section, the valve core is arranged in the valve body, the valve core can move in the valve body to be communicated or disconnected with the liquid inlet section and the liquid outlet section, the piston is arranged in the liquid outlet section, the piston is in contact with the valve core, the piston and the valve core move along the length direction of the valve body, one end of the switch assembly is communicated with the liquid inlet of the valve, the other end of the switch assembly is communicated with the liquid passing port, and the switch assembly is used for controlling the movement of the valve core. The stop valve disclosed by the invention is simple in structure and low in production cost.

Description

Shut-off valve

technical field

The invention belongs to the technical field of valves, and in particular relates to a shut-off valve.

Background technique

Valves are indispensable fluid control equipment in various sectors of the national economy such as petroleum, chemical industry, power stations, long-distance pipelines, aerospace and marine oil production. The development and needs of these industries have promoted the development of the valve industry. In recent years, while meeting the new requirements of high parameters in various aspects, we have also paid close attention to the structure, material and production process of the valve, and how to better improve performance, feasibility and reduce costs. For factory engineering projects, especially large-scale national projects, the social, economic and ecological benefits brought by valve improvement are huge. The related art proposes a shut-off valve, which controls the opening or closing of the main valve by controlling the differential spool through an electromagnetic pilot valve, but has the disadvantages of complicated flow channel structure and high production cost.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the present invention proposes a shut-off valve, which has a simple structure and low production cost.

The shut-off valve according to the embodiment of the present invention includes: a valve body with an accommodating cavity, the accommodating cavity including a liquid inlet section and a liquid outlet section that communicate with each other, and the valve body is provided with a liquid inlet, a liquid outlet and a liquid passage port, the liquid inlet port is communicated with the liquid inlet section, the liquid outlet port and the liquid passage port are respectively communicated with the liquid outlet section; the valve core, the valve core is arranged in the valve body, so The valve core can move in the valve body to connect or disconnect the liquid inlet section and the liquid outlet section; a piston, the piston is arranged in the liquid outlet section, and the piston is in contact with the valve core, The piston and the valve core move along the length direction of the valve body; a switch assembly, one end of the switch assembly is communicated with the liquid inlet of the valve body, and the other end of the switch assembly is connected to the valve body. The liquid port is communicated, and the switch assembly is used to control the movement of the valve core.

The shut-off valve of the embodiment of the present invention has a simple structure and low production cost.

In some embodiments, the valve body is further provided with a communication hole, the communication hole is provided between the liquid inlet section and the liquid outlet section to communicate the liquid inlet section and the liquid outlet section, and the valve core at least The valve core has an open position and a closed position. In the open position, the valve core opens the communication hole, and in the closed position, the valve core closes the communication hole. hole.

In some embodiments, the radial dimension of at least a portion of the piston is greater than the radial dimension of the communication hole.

In some embodiments, the switch assembly includes a switch member, the switch member has an oil drain port, an oil inlet port, and an oil outlet port, the oil inlet port communicates with the liquid inlet port, and the oil outlet port communicates with all As mentioned in the liquid port,

When the switch element is closed, the oil outlet is communicated with the oil drain port, and the fluid in the oil drain section passes through the oil outlet port and is discharged from the oil drain port, so that the piston is far away from the oil drain port. The pressure on the end face of the valve core is less than the pressure on the end face of the valve core away from the piston,

When the switch member is opened, the oil inlet is communicated with the oil outlet, so that the fluid of the liquid inlet enters the end face of the piston on the side away from the valve core through the oil inlet, so that the The pressure on the end surface of the piston on the side away from the valve core is greater than the pressure on the end surface of the valve core on the side away from the piston.

In some embodiments, the switch element further includes a control switch, the control switch is used for connecting or blocking the oil inlet and the oil outlet, and the control switch is used for connecting or blocking the oil outlet port and the drain port,

When the control switch is turned on, the control switch connects the oil inlet and the second oil outlet, and the control switch blocks the oil outlet and the oil drain port,

When the control switch is turned off, the control switch blocks the oil inlet and the oil outlet, and the control switch communicates with the oil outlet and the oil drain.

In some embodiments, the valve core has a first cavity and a first hole, the first cavity communicates with the liquid inlet, and the first hole communicates with the liquid inlet section.

In some embodiments, the number of the first holes is multiple, and the plurality of first holes are arranged at intervals in the circumferential direction of the valve core.

In some embodiments, a side of the valve core adjacent to the communication hole has a sealing portion, and in the closed position, the sealing portion abuts with the valve body to seal the communication hole.

In some embodiments, the cross-sectional area of the sealing portion gradually decreases in the axial direction of the spool toward the piston.

In some embodiments, the stop valve further includes an elastic member, one end of the elastic member is adapted to abut with one end of the valve core, and the other end of the elastic member abuts with the valve body.

Description of drawings

FIG. 1 is a schematic diagram of a stop valve according to an embodiment of the present invention.

Reference number:

Valve body 1, accommodating cavity 11, liquid inlet section 111, liquid outlet section 112, liquid inlet 12, liquid outlet 13, liquid passage 14, communication hole 15,

Valve core 2, third part 21, fourth part 22, first cavity 23, first hole 24, sealing part 25,

Piston 3, first part 31, second part 32,

Switch assembly 4 , switch member 41 , control switch 42 , elastic member 5 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

As shown in FIG. 1 , the globe valve according to the embodiment of the present invention includes a valve body 1 , a valve core 2 , a piston 3 and a switch assembly 4 . The valve body 1 has a accommodating cavity 11 , and the accommodating cavity 11 includes a liquid inlet section 111 and In the liquid outlet section 112, the valve body 1 is provided with a liquid inlet port 12, a liquid outlet port 13 and a liquid passage port 14. The liquid inlet port 12 is communicated with the liquid inlet section 111, and the liquid outlet port 13 and the liquid passage port 14 are respectively connected with the liquid outlet section. 112 is connected, the valve core 2 is set in the valve body 1, the valve core 2 can move in the valve body 1 to connect or disconnect the liquid inlet section 111 and the liquid outlet section 112, the piston 3 is set in the liquid outlet section 112, the piston 3 In contact with the valve core 2, the piston 3 can drive the valve core 2 to move in the length direction of the valve body 1 (up and down as shown in FIG. 1), and one end of the switch assembly 4 is connected to the liquid inlet 12 of the valve body 1. The other end of the switch assembly 4 is communicated with the liquid port 14 , and the switch assembly 4 is used to control the movement of the valve core 2 .

Specifically, as shown in FIG. 1 , the valve body 1 has an accommodating cavity 11 , and the accommodating cavity 11 includes a liquid inlet section 111 and a liquid outlet section 112 that communicate with each other in the up-down direction, that is, the upper end of the liquid inlet port 12 and the liquid inlet section The lower end of the liquid inlet 111 is connected with the lower end of the liquid outlet section 112, the lower end of the liquid passage 14 is connected with the upper end of the liquid outlet section 112, and one end of the liquid outlet 13 is connected with the liquid outlet section 112. Pass,

The valve core 2 and the piston 3 are arranged opposite to each other in the up and down direction, and the upper end of the valve core 2 is connected with the lower end of the piston 3. The valve core 2 can move in the up and down direction to connect or disconnect the liquid inlet section 111 and the liquid outlet section 112. For example, the valve core 2 moves upward to block the liquid outlet section 112 from the liquid inlet section 111 , and the valve core 2 moves downward to connect the liquid outlet section 112 with the liquid inlet section 111 .

The piston 3 is divided into a first part 31 and a second part 32, the lower end of the first part 31 is connected with the upper end of the second part 32, the first part 31 can be cylindrical, the accommodating cavity 11 can be cylindrical, the first part 31 The radial dimension is the same as the radial dimension of the accommodating cavity 11 so that the upper end face of the first part 31 seals the cavity space between the upper end face of the first part 31 and the upper end of the accommodating cavity 11, and one end of the switch assembly 4 is connected to the inlet The liquid port 12 is connected, and the fluid in the liquid inlet 12 flows into the liquid port 14 through the switch assembly 4, thereby pushing the piston 3 to move down, thereby driving the valve core 2 to move down, and then opening the stop valve. When the stop valve is closed, The switch assembly 4 is closed to pass the fluid flowing into the switch assembly 4 through the liquid port 14 into the return tank, and then the valve core 2 moves upward to close the shut-off valve.

The globe valve of the embodiment of the present invention controls the movement of the valve core 2 by setting the switch assembly 4 to open or close the globe valve. , simple structure and low production cost.

In some embodiments, the valve body 1 is further provided with a communication hole 15. The communication hole 15 is provided between the liquid inlet section 111 and the liquid outlet section 112 to communicate with the liquid inlet section 111 and the liquid outlet section 112. The valve core 2 is at least partially Extending into the communication hole 15 , the valve core 2 has an open position and a closed position. In the open position, the valve core 2 opens the communication hole 15 , and in the closed position, the valve core 2 closes the communication hole 15 .

Specifically, as shown in FIG. 1 , the radial size of the communication hole 15 is smaller than the radial size of the liquid inlet section 111 , and the radial size of the communication hole 15 is smaller than the radial size of the liquid outlet section 112 . It is communicated with the liquid inlet section 111, and the lower end of the communication hole 15 is communicated with the liquid outlet section 112. In the open position, the valve core 2 at least partially extends into the communication hole 15 to close the communication hole 15. The valve core 2 can be cylindrical and communicate with each other. The hole 15 can be circular, the valve core 2 moves upward to close the communication hole 15, or the valve core 2 is cylindrical and the communication hole 15 is funnel-shaped, that is, the flow area of the communication hole 15 gradually increases from top to bottom, The valve core 2 moves upwards to engage with the communication hole 15 to close the communication hole 15 , and the valve core 2 moves downward to open the communication hole 15 .

In the cut-off valve of the embodiment of the present invention, the communicating hole 15 is provided, the communicating hole 15 communicates with the liquid inlet section 111 and the liquid outlet section 112, and the valve core 2 moves up and down to open or close the communicating hole 15, thereby improving the stability of the cut-off valve. and security.

In some embodiments, the radial dimension of at least part of the piston 3 is larger than the radial dimension of the communication hole 15 .

Specifically, as shown in FIG. 1 , the piston 3 includes a first part 31 and a second part 32 , the radial dimension of the second part 32 is smaller than the radial dimension of the communication hole 15 , and the radial dimension of the first part 31 is larger than the communication hole The radial dimension of 15, according to the calculation formula of pressure, when the fluid of the liquid inlet 12 enters the liquid passage 14 through the switch assembly 4 and acts on the upper end of the piston 3, the radial dimension of the first part 31 is larger than the diameter of the communication hole 15. The size is so that the piston 3 moves downward, that is, the pressure at the upper end of the piston 3 and the valve core 2 is greater than the pressure at the lower end of the plug and the valve core 2. When the switch assembly 4 is closed, the switch assembly 4 and the liquid port 14 are closed. The fluid between the two flows into the oil tank through the switch assembly 4, thereby causing the fluid pressure and capacity on the upper end face of the piston 3 to decrease, that is, the pressure at the upper end of the piston 3 and the spool 2 as a whole is less than the pressure at the lower end of the plug and the spool 2, and the spool 2 Push the piston 3 to move upward to close the communication hole 15 , thereby completing the opening or closing of the shut-off valve.

In the globe valve according to the embodiment of the present invention, the radial dimension of the first portion 31 is larger than the radial dimension of the communication hole 15 , and the radial dimension of the first portion 31 is larger than the radial dimension of the communication hole 15 , so that the piston 3 is directed downward. When the switch assembly 4 is closed, the fluid between the switch assembly 4 and the liquid port 14 flows back to the oil tank through the switch assembly 4, thereby causing the fluid pressure and capacity on the upper end face of the piston 3 to decrease, and the valve core 2 pushes the piston 3 to move upward to The communication hole 15 is closed to complete the opening or closing of the shut-off valve, thereby improving the stability and safety of the shut-off valve.

In some embodiments, the switch assembly 4 includes a switch member 41, the switch member 41 has an oil drain port, an oil inlet port and an oil outlet port, the oil inlet port is connected to the liquid inlet port 12, the oil outlet port is connected to the liquid port 14, and the switch member When 41 is closed, the oil outlet is connected to the oil drain port, and the fluid in the oil drain section passes through the oil outlet and is discharged from the oil drain port, so that the pressure on the end face of the piston 3 away from the valve core 2 is smaller than that of the valve core 2 away from the valve core 2. The pressure on the end face of the piston 3 side, when the switch member 41 is opened, the oil inlet is connected to the oil outlet, so that the fluid of the liquid inlet 12 enters the end face of the piston 3 away from the valve core 2 through the oil inlet, so as to The pressure on the end surface of the piston 3 away from the valve core 2 is greater than the pressure on the end surface of the valve core 2 away from the piston 3 .

Specifically, as shown in FIG. 1 , when the switch member 41 is closed, the oil outlet is connected to the oil drain port, and the oil drain port is connected to the oil return tank. The fluid at the upper end of the piston 3 enters the oil outlet through the liquid passage 14 , and the oil outlet is in the oil outlet. The fluid enters the return tank through the oil drain port, thereby reducing the pressure of the fluid at the upper end of the piston 3, the upper end pressure of the valve core 2 and the piston 3 as a whole is less than the pressure at the lower end of the valve core 2 and the piston 3, and the piston 3 and the valve core 2 are upward. It moves to close the communication hole 15 so that the shut-off valve is closed.

When the switch member 41 is opened, the oil inlet is connected to the liquid inlet 12, the other end of the oil inlet is connected to the oil outlet, the oil outlet is disconnected from the oil drain port, and the fluid of the liquid inlet 12 enters the outlet through the oil inlet. The fluid from the oil port and the oil outlet enters the chamber at the upper end of the piston 3 through the liquid port 14. Since the radial dimension of the first part 31 is larger than the radial dimension of the communication hole 15, the spool 2 and the piston are calculated by the pressure formula. 3. The pressure at the upper end of the whole is greater than the pressure at the lower end of the whole of the valve core 2 and the piston 3, and then the piston 3 and the valve core 2 move downward to open the communication hole 15, so that the stop valve is opened.

Optionally, the switch member 41 further includes a control switch 42, the control switch 42 is used for connecting or blocking the oil inlet and the oil outlet, and the control switch 42 is used for connecting or blocking the oil outlet and the oil drain port, and the control switch 42 is turned on When the control switch 42 is connected to the oil inlet and the second oil outlet, and the control switch 42 blocks the oil outlet and the oil drain port, when the control switch 42 is closed, the control switch 42 blocks the oil inlet and the oil outlet, and the control switch 42 blocks the oil inlet and the oil outlet. 42 communicates the oil outlet and the oil drain port. The control switch 42 can also receive a control signal, so that the control signal controls the control switch 42 to be turned on or off, thereby avoiding direct operation by the operator, realizing remote control, and reducing the work intensity of the operator.

Alternatively, the switch assembly may be a solenoid valve.

The globe valve of the embodiment of the present invention controls the movement of the valve core 2 by setting the switch assembly 4 to open or close the globe valve. Compared with the prior art, which uses the differential valve core to indirectly control the valve core 2, the globe valve of the embodiment of the present invention, The structure is simple and the production cost is low. By setting the control switch 42, the control switch 42 can also receive a control signal, so that the control signal can control the control switch 42 to be turned on or off, thereby avoiding the direct operation of the operator, realizing remote control, and reducing the number of operators. work intensity.

In some embodiments, the valve core 2 has a first cavity 23 and a first hole 24 , the first cavity 23 communicates with the liquid inlet 12 , and the first hole 24 communicates with the liquid inlet section 111 .

Specifically, as shown in FIG. 1 , the valve core 2 includes a third part 21 and a fourth part 22 connected to each other, the lower end of the third part 21 is connected with the upper end of the fourth part 22 , and the radial dimension of the third part 21 is smaller than The radial dimension of the liquid inlet section 111 , that is, a first gap is provided between the outer peripheral surface of the third part 21 and the inner wall surface of the liquid inlet section 111 , and the radial size of the fourth section 22 is the same as that of the liquid inlet section 111 . Similarly, to prevent fluid from entering the first gap through the junction between the outer peripheral surface of the fourth part 22 and the inner wall surface of the liquid inlet section 111, the stability and safety of the shut-off valve are improved.

The first cavity 23 extends up and down, one end of the first hole 24 communicates with the first gap, the other end of the first hole 24 communicates with the first cavity 23, the lower end of the first cavity 23 communicates with the liquid inlet 12, and the third part The radial dimension of the upper end of 21 is at least partially larger than the radial dimension of the communication hole 15 . When the valve core 2 moves upward to close the communication hole 15, the upper end of the third part 21 abuts against the communication hole 15 to block the communication between the first gap and the communication hole 15. When the valve core 2 moves downward, the first The fluid in a gap enters the communication hole 15, and then the shut-off valve is opened.

Optionally, the number of the first holes 24 is multiple, and the plurality of first holes 24 are arranged at intervals in the circumferential direction of the valve core 2 . Then, the flow rate of the fluid when the globe valve is opened is increased, so as to be suitable for different use environments.

Optionally, the radial dimension of the second portion 32 is smaller than the radial dimension of the communication hole 15 , the radial dimension of the first portion 31 is larger than the radial dimension of the communication hole 15 , and the radial dimension of the communication hole 15 is smaller than that of the liquid outlet section 112 . The radial dimension of the second part 32, that is, the outer peripheral surface of the second part 32 has a second gap with the inner wall surface of the liquid inlet section 111 and the inner wall surface of the communication hole 15, and the second gap is communicated with the liquid outlet 13. When the valve core 2 moves downward When the first gap is communicated with the communication hole 15, the fluid in the liquid inlet 12 enters the first hole 24 through the first cavity 23, the fluid in the first hole 24 flows into the first gap, and the fluid in the first gap enters the communication hole 15. , and then the fluid enters the second gap, the fluid in the second gap flows out from the liquid outlet 13, and the stop valve is opened.

In the cut-off valve of the embodiment of the present invention, by setting the first cavity 23 and the first hole 24, when the cut-off valve is opened, the fluid in the liquid inlet 12 enters the first hole 24 through the first cavity 23, and the fluid in the first hole 24 The fluid communicates with the communication hole 15 through the first gap, and then enters the second gap, and the fluid in the second gap is discharged through the liquid outlet 13. By arranging the first cavity 23 and the first hole 24 on the valve core 2, the valve is lowered. The complexity of the structure of the core 2 makes the structure of the valve core 2 simple and low in production cost.

In some embodiments, a side of the valve core 2 adjacent to the communication hole 15 has a sealing portion 25 , and in the closed position, the sealing portion 25 abuts with the valve body 1 to seal the communication hole 15 .

Specifically, as shown in FIG. 1 , the upper end of the valve core 2 has a sealing part 25 , that is, the upper end of the third part 21 has a sealing part 25 . When the valve core 2 moves upward to close the stop valve, the sealing part 25 and the valve body 1 Abutting to seal the communication hole 15, optionally the sealing portion 25 may be provided with a sealing ring, or the sealing portion 25 may be provided with a sealing ring.

The shut-off valve of the embodiment of the present invention is provided with a sealing portion 25. When the shut-off valve is closed, the sealing portion 25 abuts against the valve body 1 to seal the communication hole 15, thereby improving the stability and safety of the shut-off valve.

In some embodiments, the cross-sectional area of the sealing portion 25 gradually decreases in the direction close to the piston 3 in the axial direction of the valve core 2 (the up-down direction as shown in FIG. 1 ).

Specifically, as shown in FIG. 1 , the cross-sectional area of the sealing portion 25 gradually decreases from top to bottom, that is, the end face of the sealing portion 25 abutting against the inner wall surface of the communication hole 15 is arranged obliquely relative to the communication hole 15 , and when the valve core 2. When moving from bottom to top to seal the communication hole 15, the sealing part 25 is inclined relative to the communication hole 15 so that the sealing part 25 is clamped with the inner wall surface of the communication hole 15, thereby improving the sealing performance when the valve is closed and improving the stability of the stop valve and security.

Optionally, the flow area of the first hole 24 gradually decreases from bottom to top, for example, the inner wall surface of the first hole 24 is arranged in parallel with the end surface of the sealing portion 25 abutting the communication hole 15, thereby improving the sealing performance when the valve is closed, Improve the stability and safety of the globe valve.

In some embodiments, the shut-off valve further includes an elastic member 5 , one end of the elastic member 5 is adapted to abut against one end of the valve core 2 , and the other end of the elastic member 5 abuts against the valve body 1 catch.

Specifically, as shown in FIG. 1 , the elastic member 5 is disposed between the valve body 1 and the valve core 2 , that is, the lower end of the elastic member 5 is in contact with the valve body 1 , and the upper end of the elastic member 5 is in contact with the inside of the first cavity 23 . The walls are connected, and the elastic member 5 makes the valve core 2 move upward to seal the communication hole 15.

Optionally, the number of the elastic members 5 is multiple, the lower ends of the multiple elastic members 5 are in contact with the valve body 1, the upper ends of the multiple elastic members 5 are connected with the inner wall surface of the first cavity 23, and the multiple elastic members 5 make The valve core 2 has a tendency to move upward to seal the communication hole 15 in use.

Optionally, the elastic member 5 may be a spring, or the elastic member may be a C-shaped elastic piece.

In the cut-off valve of the embodiment of the present invention, by providing the elastic member 5, when the cut-off valve is closed, the sealing portion 25 abuts against the valve body 1 to seal the communication hole 15, and the elastic member 5 enables the valve core 2 to move upward to seal the communication hole. 15 sealing trend, thus improving the stability and safety of the globe valve.

In another embodiment, the upper end of the elastic member 5 is connected to the valve body 1 , the upper end of the elastic member 5 is in contact with the lower end surface of the first part 31 , and the elastic member 5 enables the piston 3 to move upward to drive the valve core 2 to move upward. There is a tendency to seal the communication hole 15 .

Optionally, the number of the elastic members 5 is multiple, the upper ends of the multiple elastic members 5 are connected to the valve body 1, the upper ends of the multiple elastic members 5 are in contact with the lower end surface of the first part 31, and the multiple elastic members 5 The piston 3 has a tendency to move upward to drive the valve core 2 to move upward to seal the communication hole 15 .

In the cut-off valve of the embodiment of the present invention, by providing an elastic member 5, when the cut-off valve is closed, the sealing portion 25 abuts against the valve body 1 to seal the communication hole 15, and the elastic member 5 enables the piston 3 to move upward to drive the valve core 2 upward. The tendency to move to seal the communication hole 15, thereby improving the stability and safety of the shut-off valve.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated devices or elements. It must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated, it can be a mechanical connection, an electrical connection or communication with each other, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" and the like mean a specific feature, structure, material, or description described in connection with the embodiment or example. Features are included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. A shut-off valve, comprising:

the valve body is internally provided with an accommodating cavity, the accommodating cavity comprises a liquid inlet section and a liquid outlet section which are mutually communicated, the valve body is provided with a liquid inlet, a liquid outlet and a liquid passing port, the liquid inlet is communicated with the liquid inlet section, and the liquid outlet and the liquid passing port are respectively communicated with the liquid outlet section;

the valve core is arranged in the valve body, and can move in the valve body to connect or disconnect the liquid inlet section and the liquid outlet section;

the piston is arranged in the liquid outlet section, is in contact with the valve core and moves along the length direction of the valve body;

and one end of the switch assembly is communicated with the liquid inlet of the valve body, the other end of the switch assembly is communicated with the liquid passing port, and the switch assembly is used for controlling the movement of the valve core.

2. The stop valve according to claim 1, wherein a communication hole is further formed in the valve body, the communication hole is formed between a liquid inlet section and a liquid outlet section to communicate the liquid inlet section with the liquid outlet section, the valve element at least partially extends into the communication hole, the valve element has an opening position and a closing position, the valve element opens the communication hole in the opening position, and the valve element closes the communication hole in the closing position.

3. A shut-off valve as claimed in claim 2, characterised in that the radial dimension of at least part of the piston is greater than the radial dimension of the communication hole.

4. The shut-off valve of claim 3, wherein the switch assembly includes a switch member having an oil drain port, an oil inlet in communication with the liquid inlet, and an oil outlet in communication with the liquid through port,

when the switch is closed, the oil outlet is communicated with the oil drainage port, fluid in the oil drainage section passes through the oil outlet and is drained from the oil drainage port, so that the pressure on the end face of the piston, which is far away from the valve core, is smaller than the pressure on the end face of the valve core, which is far away from the piston,

when the switch piece is opened, the oil inlet is communicated with the oil outlet, so that fluid in the liquid inlet can enter the end face of the piston on the side far away from the valve core through the oil inlet, and the pressure on the end face of the piston on the side far away from the valve core is larger than the pressure on the end face of the valve core on the side far away from the piston.

5. The stop valve of claim 4, wherein the switch member further comprises a control switch for communicating or blocking the oil inlet and the oil outlet, and for communicating or blocking the oil outlet and the oil drain port,

when the control switch is turned on, the control switch is communicated with the oil inlet and the second oil outlet and blocks the oil outlet and the oil drainage port,

when the control switch is closed, the control switch blocks the oil inlet and the oil outlet, and the control switch is communicated with the oil outlet and the oil drainage port.

6. The shut-off valve of claim 3, wherein the valve spool has a first chamber in communication with the inlet port and a first bore in communication with the inlet section.

7. The shut-off valve of claim 6, wherein the first hole is plural in number, and the plural first holes are arranged at intervals in a circumferential direction of the spool.

8. The shutoff valve of claim 2 wherein a side of said spool adjacent said communication hole has a seal portion that abuts said valve body to seal said communication hole in said closed position.

9. The shut-off valve of claim 8, wherein the cross-sectional area of the sealing portion gradually decreases in a direction approaching the piston in the axial direction of the spool.

10. The shut-off valve of any one of claims 1-9, further comprising a resilient member having one end adapted to abut one end of the spool and the other end abutting the valve body.

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