Gate valve driven by internal medium

Abstract

The utility model provides a kind of gate valve driven by internal medium, relate to gate valve field.The gate valve driven by internal medium includes: cavity, it is formed in the inside of the main body of gate valve, and medium flows in the cavity;Gate plate assembly is arranged in the cavity, and the gate plate assembly includes valve rod and gate plate;Self-driving assembly is arranged in the cavity and is connected with the valve rod;And control valve group is communicated with the cavity;The control valve group has first control position and second control position;And when the control valve group is in first control position, the medium flow can drive the self-driving assembly moves so that the gate plate closes;When the control valve group is in second control position, the medium flow can drive the self-driving assembly moves so that the gate plate opens.

Description

Technical Field

[0001] This application relates to the field of gate valves, and more particularly to a gate valve driven by an internal medium. Background Technology

[0002] A gate valve is a type of valve that controls the opening and closing of a circuit system. Currently, electric gate valves are used in main pipeline systems across various fields to control the on / off state of the pipeline system. Electric gate valves utilize an electric actuator (including a motor and reduction gear) to drive a lead screw, thereby outputting torque to raise or lower a fixed gate to achieve the gate valve's opening and closing function. However, due to the high temperature and pressure during normal operation of the circuit system, coupled with the need to consider system accident states and extreme abnormal conditions, gate valves must meet the requirements for opening and closing with large pressure differentials. This results in extremely high medium pressure on the gate and significant friction between the gate and the valve seat. To overcome the external forces on the gate, the electric actuator of the gate valve needs to output extremely high torque to achieve the gate's opening and closing function. Therefore, the lead screw of this gate valve bears unimaginable rotational torque and tensile stress, leading to the fact that the tensile strength, yield strength, and other mechanical properties of most metal materials cannot meet the design requirements of the gate valve's lead screw. To meet the requirements for ultra-high strength and high hardness materials for lead screws, the toughness of the materials must be sacrificed to meet the design requirements. Furthermore, no stress concentration should occur in any part of the lead screw, otherwise the gate valve will be at risk of lead screw breakage during the opening and closing process. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a gate valve driven by an internal medium, so as to solve the problem that the existing method of driving gate valves by electric devices is prone to breakage of the gate screw.

[0004] In accordance with the above objectives, the present invention provides a gate valve driven by an internal medium, comprising a body, wherein the body includes:

[0005] A cavity is formed inside the main body, and a medium flows through the cavity;

[0006] A gate assembly is disposed in the cavity, the gate assembly including a valve stem and a gate;

[0007] A self-driven assembly, disposed within the cavity and connected to the valve stem; and

[0008] A control valve assembly is connected to the cavity; the control valve assembly has a first control position and a second control position; and when the control valve assembly is in the first control position, the medium flow can drive the self-driven component to move so that the gate is closed; when the control valve assembly is in the second control position, the medium flow can drive the self-driven component to move so that the gate is opened.

[0009] Preferably, the main body includes a valve body assembly, a cylinder, and a valve cover, the valve body assembly, the cylinder, and the valve cover being connected sequentially to form the main body into a quasi-cylindrical shape with an axis; a support platform is formed at the middle position of the cylinder along its length, the support platform being formed into an annular structure extending toward the axis of the main body.

[0010] Preferably, along the length of the main body, the support platform divides the cavity into a first sub-cavity and a second sub-cavity, and the first sub-cavity is located on the side closer to the valve body assembly; the gate assembly is located in the first sub-cavity, and the self-driving assembly is located in the second sub-cavity.

[0011] Preferably, the axis of the valve stem coincides with the axis of the main body, and the valve stem extends into the second sub-cavity; the through hole of the support platform is adapted to the valve stem.

[0012] Preferably, the self-driving assembly includes a piston and a pre-tightening member, the piston and the pre-tightening member being connected to each other and both being sleeved on the end of the valve stem near the valve cover; a groove is formed at the end of the piston near the valve cover, and the pre-tightening member is disposed in the groove.

[0013] Preferably, the self-driving assembly further includes an upper stroke valve core and a lower stroke valve core; the upper stroke valve core is connected to the end of the valve stem near the valve cover; the lower stroke valve core is disposed on the end face of the support platform facing the valve cover, and when the main body is in the closed state, the lower stroke valve core is in contact with the piston.

[0014] Preferably, the cylinder has a first connecting hole and a second connecting hole, which are respectively connected to the first sub-cavity and the second sub-cavity; both the first connecting hole and the second connecting hole are connected to the control valve assembly.

[0015] Preferably, the control valve assembly includes a booster solenoid valve and a relief solenoid valve connected in sequence. The first connection port is connected to the inlet of the booster solenoid valve, and the second connection port is connected to the position where the booster solenoid valve and the relief solenoid valve are connected. When the control valve assembly is in the first control position, the booster solenoid valve is working, and the relief solenoid valve is not working. When the control valve assembly is in the second control position, the relief solenoid valve is working, and the booster solenoid valve is not working.

[0016] Preferably, the gate assembly further includes a gate sleeve, the valve stem is connected to the side of the gate sleeve near the valve cover; the gate is connected inside the gate sleeve, and an anti-rotation key is provided between the gate sleeve and the gate; there are two gates, and the two gates are symmetrically arranged about the axis of the main body; each of the two gates has a recess on its facing side, and a spring is provided in the recess.

[0017] Preferably, the gate valve driven by the internal medium is further provided with a position indicator and a locking device, the locking device extending into the cavity and connected to the valve stem, and the position indicator being connected to the locking device.

[0018] According to the present invention, the gate valve driven by the internal medium connects the self-driving component to the valve stem inside the valve chamber. Then, by controlling the medium flowing inside the valve assembly and the gate valve, the self-driving component can be moved, thereby driving the gate valve plate to open or close, which greatly reduces the possibility of gate plate breakage.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a gate valve driven by an internal medium according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the gate valve in the first control position according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the gate valve in the second control position according to an embodiment of the present invention.

[0024] Icons: 10-Valve body assembly; 11-Cylinder; 111-Upper cylinder; 1110-Second connecting hole; 112-Lower cylinder; 1120-First connecting hole; 12-Valve cover; 13-Cavity; 14-Support platform; 131-Valve cavity; 132-Piston cavity; 2-Gate assembly; 20-Gate sleeve; 21-Gate; 22-Spring; 23-Anti-rotation key; 24-Valve stem; 3-Self-driven assembly; 30-Piston component; 31-Preload component; 32-Upper stroke valve core; 33-Lower stroke valve core; 40-Pressure boosting solenoid valve; 41-Pressure relief solenoid valve; 5-Position indicator; 6-Locking device. Detailed Implementation

[0025] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0026] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0027] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0028] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0029] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0030] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0031] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0032] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0033] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0034] like Figures 1 to 3As shown, the gate valve driven by an internal medium in this embodiment has a main body and includes: a valve body assembly 10, a gate assembly 2, a self-driving assembly 3, a control valve group, etc. The specific structure of each of the above-mentioned parts of the gate valve driven by an internal medium according to the present invention will be described in detail below.

[0035] In this embodiment, as Figure 1 As shown, the main body includes a valve body assembly 10, a cylinder 11, and a valve cover 12, which are connected sequentially to form a cylindrical structure with an axis. A cavity, namely the gate valve cavity 13, is formed inside the main body. This cavity 13 is used for the flow of the medium and the movement of the various components described below. Furthermore, the cavity 13 is also formed into a cylindrical structure similar to the main body, and its axis coincides with the axis of the main body, which is beneficial to the stability and consistency of the overall gate valve structure. It should be noted that in this embodiment, the cylinder 11 includes an upper cylinder 111 and a lower cylinder 112 connected to each other. The upper cylinder 111 is connected to the valve cover 12, and the lower cylinder 112 is connected to the valve body assembly 10. Furthermore, the upper cylinder 111 and the valve cover 12, as well as the lower cylinder 112 and the valve body assembly 10, are integrally formed. The upper cylinder 111 and the lower cylinder 112 are detachably connected via flanges, gaskets, and other connecting components. This ensures the sealing of the cavity 13 while facilitating the installation and maintenance of the various components within the cavity 13. Preferably, a wedge seal is used between the upper cylinder 111 and the lower cylinder 112 to further enhance the sealing of the cavity 13.

[0036] It should be further noted that there are no specific restrictions on the connection point between the upper cylinder 111 and the lower cylinder 112, or their lengths, as long as the aforementioned technical effects can be achieved. Similarly, the size of the valve body assembly 10, the valve cover 12, and the cavity 13 are not fixed and should be determined based on actual conditions such as the flow rate of the circuit medium.

[0037] Furthermore, in this embodiment, such as Figures 1 to 3As shown, a support platform 14 is provided at the middle position along the length of the cylinder 11. The support platform 14 is formed as an annular structure extending towards the axis of the main body. This support platform 14 facilitates the technical effect of controlling the opening and closing of the gate 21 by the flow of the medium. Specifically, the support platform 14 is formed on the inner wall of the upper cylinder 111, and the through hole of the support platform 14 is adapted to the valve stem 24 to facilitate the axial movement of the valve stem 24. Along the length of the main body, the support platform 14 divides the cavity 13 into a first sub-cavity (i.e., valve cavity 131) and a second sub-cavity (i.e., piston cavity 132). The valve cavity 131 is located on the side closer to the valve body assembly 10. Dividing the cavity 13 into two parts in this way increases the accuracy of the control valve assembly in controlling the flow of the medium and avoids the gate 21 from wearing or breaking due to excessive medium flow velocity.

[0038] In this embodiment, as Figures 1 to 3 As shown, the gate assembly 2 is located in the valve cavity 131. The gate assembly 2 includes a gate sleeve 20, a gate 21, and a valve stem 24. Specifically, the gate sleeve 20 has a through hole formed in a direction perpendicular to the axis of the main body, which is used to connect the gate 21; and the side of the gate sleeve 20 near the valve cover 12 has a groove for corresponding connection of the valve stem 24. In this embodiment, the number of gates 21 is set to two, and the two gates 21 are symmetrically arranged about the axis of the main body. In addition, the sides of the two gates 21 facing each other have corresponding recesses, in which compression springs 22 with rectangular cross sections are provided. This arrangement allows the gates 21 to contract inward (i.e., contract towards the axis of the main body) at the moment the gate valve is opened or closed, thereby reducing the frictional resistance during the opening and closing of the gate valve and the damage to the seals during the opening and closing process. It also allows the gates 21 to maintain a reliable seal under the combined action of the spring force of the spring 22 and the medium pressure after the gate valve is closed. In order to ensure the stability of the connection between the gate sleeve 20 and the gate 21, an anti-rotation key 23 is also provided between them.

[0039] Furthermore, the valve stem 24 is formed as a near-cylindrical structure with an axis, and the axis of the valve stem 24 coincides with the axis of the main body. For example... Figures 1 to 3As shown, the lower end of the valve stem 24 in this embodiment is provided with a first thread, which enables the valve stem 24 to be connected to the gate sleeve 20. A conical frustum is formed at the transition point between the first thread and the valve stem 24, with the conical surface of the frustum facing the valve cover 12. The larger diameter end of the frustum fits against the gate sleeve 20, thus this structure provides a certain limiting effect on the gate sleeve 20 to prevent movement of the gate sleeve 20 and the gate 21. Furthermore, the valve stem 24 extends into the piston chamber 132 through the through hole of the support platform 14. A shoulder structure and a second thread are formed at the upper end of the valve stem 24, and a circular countersunk hole is formed at the top of the valve stem 24 to facilitate the corresponding connection of the self-driving assembly 3.

[0040] In this embodiment, the self-driven assembly 3 is located in the piston chamber 132 and includes a piston 30 and a preload member 31. Both the piston 30 and the preload member 31 are connected to the valve stem 24 via the aforementioned second thread. A groove is formed at the end of the piston 30 near the valve cover 12, which is used to place the preload member 31 to fix the piston 30. In addition, the valve stem 24 has a shoulder corresponding to the end face of the piston 30 near the support platform 14 to further fix the piston 30. Furthermore, the self-driven assembly 3 also includes an upper stroke valve core 32 and a lower stroke valve core 33. A countersunk hole corresponding to the countersunk hole at the top of the valve stem 24 is formed at the top of the preload member 31 to connect the upper stroke valve core 32. The lower stroke valve core 33 is disposed at the end of the support platform 14 facing the valve cover 12, and when the gate valve is in the closed state, the lower stroke valve core 33 is in contact with the piston 30.

[0041] More specifically, although not shown in the figure, the piston 30 has multiple annular grooves on its side for mounting piston rings, which further increase the stability of the piston 30 when driven by the medium. The piston rings are rectangular metal rings, and each piston ring has a stepped opening. Furthermore, the preload 31 consists of a main nut and multiple push screws. Multiple threaded holes are machined at the axial end of the main nut, and the push screws are correspondingly installed in these holes. The actual tension connecting the main nut and the valve stem 24 is achieved through the push screws. After the push screws are preloaded, the main nut cannot loosen. After the main nut is connected to the valve stem 24 via a second thread, the piston 30 is confined between the shoulder of the valve stem 24 and the main nut. Additionally, a support washer is provided between the piston 30 and the main nut.

[0042] Furthermore, in this embodiment, a control valve assembly communicating with the aforementioned cavity 13 is also provided. This control valve assembly has a first control position and a second control position. When it is in the first control position, the control valve assembly can control the flow of the medium to drive the self-driven component 3 downward (moving towards the valve body assembly 10), thereby closing the gate assembly 2. When it is in the second control position, the control valve assembly can control the flow of the medium to drive the self-driven component 3 upward (moving towards the valve cover 12), thereby opening the gate assembly 2. To achieve the aforementioned technical effects, such as... Figures 1 to 3 As shown, the lower cylinder 112 and the upper cylinder 111 are respectively formed with a first connecting hole 1120 and a second connecting hole 1110, and the first connecting hole 1120 and the second connecting hole 1110 can communicate with the valve chamber 131 and the piston chamber 132 respectively.

[0043] Furthermore, the control valve assembly includes a pressure boosting solenoid valve 40 and a pressure relief solenoid valve 41 connected in sequence. Specifically, the first connection port 1120 is connected to the inlet of the pressure boosting solenoid valve 40, and the second connection port 1110 is connected to the position where the pressure boosting solenoid valve 40 and the pressure relief solenoid valve 41 are connected, that is, the second connection port 1110 is simultaneously connected to the outlet of the pressure boosting solenoid valve 40 and the inlet of the pressure relief solenoid valve 41.

[0044] Specifically, in the initial state, such as Figure 3 As shown, the gate assembly 2 is located at the bottom of the gate valve under the action of gravity, and the gate 21 is pressed against the valve body assemblies 10 at both ends under the action of the spring 22. When the working medium is introduced into the system pipeline, the pressure relief solenoid valve 41 is energized and opened (the pressure boosting solenoid valve 40 is de-energized), and the piston chamber 132 is connected to the system drain tank (not shown in the figure) through the lower stroke valve core 33; the medium entering the valve chamber 131 acts on the valve stem 24 and the cross section of the gate 21. Under the action of the medium force, the gate 21 retracts towards the center of the gate sleeve 20. At the same time, the valve stem 24 drives the gate assembly 2 to open upward under the action of the medium force until the valve stem 24 and the cylinder 11 are closed and sealed. In this way, the medium in the chamber 13 will not leak from the gap between the valve stem 24 and the cylinder 11. At the same time, the upper stroke valve core 32 can act as a locking rod to enter the locking device 6 and trigger the position indicator device 5, thereby sending a valve start signal to the control room. Since the valve stem 24 is sealed with the cylinder 11 and the upper stroke valve closes the passage for the medium in the cavity 13 to enter the self-driven assembly 3, the pressure relief solenoid valve 41 is closed at this time. There is no pressure boosting passage in the upper cavity of the self-driven assembly 3 (i.e., the piston cavity 132 located on the side of the self-driven assembly 3 near the valve cover 12). Furthermore, since the upper stroke valve stem 24 is locked, the gate valve can always remain open.

[0045] When the gate valve needs to be closed, the locking device 6 is first given an unlocking signal to energize and open the pressure boosting solenoid valve 40 (the pressure relief solenoid valve 41 is de-energized). Then, the medium from the system pipeline enters the upper chamber of the self-driven assembly 3 through the pressure boosting solenoid valve 40. This medium can push the self-driven assembly 3 to move downward. At the same time, the upper stroke valve core 32 opens, and the inner cavity of the gate sleeve 20 is connected to the upper cavity of the self-driven assembly 3. Since the self-driven component 3 is in a downward movement state, the pressure in the upper chamber of the self-driven component 3 in this state is about 1 / 5 of the pressure in the cavity 13 (calculated through multiple experiments), which is much lower than the system pipeline pressure. The pressure in the gate assembly 2 is discharged to the self-driven component 3. Under the action of the medium pressure in the cavity 13, the gate 21 contracts into the gate sleeve 20. After contraction, the gate assembly 2 moves downward together with the self-driven component 3. When the piston 30 moves to the lowest end, the lower valve is closed and the piston 30 stops moving. The pressure in the upper chamber of the self-driven component 3 and the gate assembly 2 gradually increases to be equal to the pressure in the system pipeline. Under the action of the spring 22, the gate 21 pops out in a direction away from the center of the gate sleeve 20, thereby closing the valve body assembly 10 at the outlet end of the gate valve, so that the pressure of the medium in the cavity 13 acts on the valve plate, thereby keeping the gate 21 closed and reliably sealed. If the booster solenoid valve 40 is de-energized at this time, the medium in the system circuit will be cut off. However, since the medium in the cavity 13 can enter the upper cavity of the self-driven assembly 3 through the central hole of the valve stem 24, and the medium in the upper cavity of the self-driven assembly 3 is closed by the pressure relief solenoid valve 41, the pressure inside the self-driven assembly 3 can be the same as the pressure in the cavity 13, thereby enabling the gate valve to remain reliably closed for a long time.

[0046] In addition, this gate valve is also connected to a position indicator 5 and a locking device 6. The locking device 6 extends into the cavity 13 and is connected to the valve stem 24. The position indicator 5 is connected to the locking device 6.

[0047] According to the gate valve driven by the internal medium as described above, the self-driving assembly 3 is connected to the valve stem 24 inside the cavity 13. The self-driving assembly 3 is moved by controlling the medium flowing inside the valve assembly and the gate valve, thereby opening or closing the gate plate 21. This greatly reduces the possibility of gate plate 21 breakage. Since the valve opening and closing is driven by the pressure of the medium itself, when the valve diameter is large, only two small solenoid valves are needed to control the medium to achieve valve opening and closing, with high reliability. This eliminates risks such as jamming during valve opening and closing, gate plate 21 rebounding upon closure, and incomplete closure. Furthermore, the gate plate 21 does not contact the valve body assembly 10 during the entire opening or closing process, reducing wear on the sealing surfaces of the gate plate 21 and the valve body assembly 10, eliminating the medium force exerted on the gate plate 21, and effectively extending the service life of the various parts in the gate valve. In addition, compared with traditional electric gate valves, this gate valve has a short response time and fast action speed, especially in special working conditions, it can quickly cut off the medium, greatly improving system safety.

[0048] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be defined by the protection scope of the claims.

Claims

1. A gate valve driven by an internal medium, comprising a body, characterized in that, The subject includes: A cavity is formed inside the main body, and a medium flows through the cavity; A gate assembly is disposed in the cavity. The gate assembly includes a valve stem and a gate. The two gates facing each other each have a recess, and a spring is disposed in the recess. A self-driven assembly, disposed within the cavity and connected to the valve stem, includes an upper-stroke valve core connected to the end of the valve stem near the valve cover; the valve stem has a central hole through which the medium can enter the self-driven assembly; and A control valve assembly is connected to the cavity; the control valve assembly includes a pressure-boosting solenoid valve and a pressure-relief solenoid valve connected in sequence, and the control valve assembly has a first control position and a second control position; when the control valve assembly is in the first control position, the pressure-boosting solenoid valve is activated, the pressure-relief solenoid valve is deactivated, and the flow of the medium can drive the self-driven component to move so that the gate is closed; when the control valve assembly is in the second control position, the pressure-relief solenoid valve is activated, the pressure-boosting solenoid valve is deactivated, and the flow of the medium can drive the self-driven component to move so that the gate is opened. The gate valve driven by the internal medium is also provided with a position indicator and a locking device. The locking device extends into the cavity and is connected to the valve stem. The position indicator is connected to the locking device. The upper stroke valve core can act as a locking rod to enter the locking device and trigger the position indicator.

2. The gate valve driven by an internal medium according to claim 1, characterized in that, The main body includes a valve body assembly, a cylinder, and a valve cover. The valve body assembly, the cylinder, and the valve cover are connected sequentially to form the main body into a cylindrical shape with an axis. A support platform is formed at the middle position of the cylinder along its length, and the support platform is formed into an annular structure extending toward the axis of the main body.

3. The gate valve driven by an internal medium according to claim 2, characterized in that, Along the length of the main body, the support platform divides the cavity into a first sub-cavity and a second sub-cavity, with the first sub-cavity located on the side closer to the valve body assembly; the gate assembly is located in the first sub-cavity, and the self-driving assembly is located in the second sub-cavity.

4. The gate valve driven by an internal medium according to claim 3, characterized in that, The axis of the valve stem coincides with the axis of the main body, and the valve stem extends into the second sub-cavity; the through hole of the support platform is adapted to the valve stem.

5. The gate valve driven by an internal medium according to claim 2, characterized in that, The self-driving assembly includes a piston and a pre-tightening member, which are connected to each other and are both sleeved on the end of the valve stem near the valve cover; a groove is formed at the end of the piston near the valve cover, and the pre-tightening member is disposed in the groove.

6. The gate valve driven by an internal medium according to claim 5, characterized in that, The self-driving assembly also includes a lower stroke valve core; the lower stroke valve core is disposed on the end face of the support platform facing the valve cover, and when the main body is in the closed state, the lower stroke valve core is in contact with the piston.

7. The gate valve driven by an internal medium according to claim 3, characterized in that, The cylinder has a first connecting hole and a second connecting hole, which are respectively connected to the first sub-cavity and the second sub-cavity; both the first connecting hole and the second connecting hole are connected to the control valve assembly.

8. The gate valve driven by an internal medium according to claim 7, characterized in that, The first connecting hole is connected to the inlet of the booster solenoid valve, and the second connecting hole is connected to the location where the booster solenoid valve and the pressure relief solenoid valve are connected.

9. The gate valve driven by an internal medium according to claim 2, characterized in that, The gate assembly further includes a gate sleeve, the valve stem is connected to the side of the gate sleeve near the valve cover; the gate is connected to the inside of the gate sleeve, and an anti-rotation key is provided between the gate sleeve and the gate; there are two gates, and the two gates are symmetrically arranged about the axis of the main body.

Images