A stop valve

Abstract

The application relates to the technical field of stop valves, and discloses a stop valve which comprises a valve body, a valve cover, a valve rod assembly and a spring, the valve cover is installed on the valve body, the valve rod assembly is arranged in the valve cover, along the axial direction of the valve rod assembly, the valve rod assembly comprises a first section which extends to the outside of the valve cover, the first section forms a limiting part, and the spring is installed between the limiting part and the valve cover along the axial direction of the valve rod assembly. The spring is arranged outside the valve body, so that the moving amount of the valve core in the liquid flow channel and the mounting channel is increased, the opening degree of the stop valve is increased, and the influence of the stop valve on the liquid flow is reduced.

Description

Technical Field

[0001] This application relates to the field of gate valve technology, and more particularly to a gate valve. Background Technology

[0002] A gate valve is a valve body used to control the flow of fluid in a pipeline. It consists of a valve body, a valve core, and a valve stem assembly. The valve stem assembly is installed in the valve body, and the valve core is installed at the end of the valve stem assembly. The valve stem assembly drives the valve core to move within the valve body, causing the valve core to come into contact with or separate from the flow-closing orifice within the valve body, thereby changing the flow of the gate valve.

[0003] Currently, all gate valves on the market contain a spring. The spring applies force to the valve core, so that the valve core is normally in a state of contact with the shut-off orifice (normally closed) or separated from the shut-off orifice (normally open).

[0004] However, the springs of existing shut-off valves are mostly installed in the valve body with limited space, which affects the opening of the valve core and thus affects the flow rate of liquid passing through the shut-off valve. Utility Model Content

[0005] This application provides a shut-off valve for increasing the opening degree of the shut-off valve and reducing the impact of the shut-off valve on the liquid flow rate.

[0006] To achieve the above objectives, the main technical solutions adopted in this application include:

[0007] A shut-off valve includes: a valve body and a valve cover, a valve stem assembly and a spring, wherein the valve cover is mounted on the valve body; the valve stem assembly passes through the valve cover and, along the axial direction of the valve stem assembly, includes a limiting portion and a first section extending beyond the valve cover, the limiting portion being fixed to the first section; along the axial direction of the valve stem assembly, the spring is mounted between the limiting portion and the valve cover.

[0008] Furthermore, the valve stem assembly includes a valve stem body, which at least partially extends beyond the valve cover to form a first segment; the limiting portion is detachably mounted on the end of the first segment away from the valve body, and along the axial direction of the valve stem assembly, the outer edge of the limiting portion protrudes beyond the outer edge of the first segment.

[0009] Furthermore, the spring is sleeved on the outside of the first segment.

[0010] Furthermore, the valve cover has a mounting groove formed at the end facing the first segment; the spring extends into the mounting groove at the end facing the valve cover.

[0011] Furthermore, the valve stem assembly includes a valve stem body and a sealing section. Along the axial direction of the valve stem assembly, the sealing section is connected to the valve stem body and is located inside the valve cover, so that the valve stem assembly is sealed to the valve cover.

[0012] Furthermore, the shut-off valve also includes sealing packing, which is installed on the end of the valve cover away from the first section, and the sealing packing is sealed and fitted onto the circumferential sidewall of the sealing section.

[0013] Furthermore, the shut-off valve also includes a sealing ring, which is fitted onto the end of the sealing section facing the first section.

[0014] Furthermore, a valve cover through hole for mounting the valve stem assembly is formed inside the valve cover, and a limiting step for limiting the sealing section is formed inside the valve cover through hole.

[0015] Furthermore, a packing groove is formed at the end of the valve cover away from the first section, and the packing groove is located on the outside of the valve stem assembly; the sealing packing is installed in the packing groove.

[0016] By mounting the spring outside the valve body, the movement of the valve core in the liquid flow channel and the mounting channel is increased, thereby increasing the opening degree of the shut-off valve and reducing the impact of the shut-off valve on the liquid flow rate. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the large-opening shut-off valve provided in this application.

[0018] Figure 2 yes Figure 1 The diagram shows a sectional view of the valve body of a large-opening shut-off valve.

[0019] Figure 3 for Figure 1 A magnified view of point A on the large-opening shut-off valve shown.

[0020] Figure 4 yes Figure 1 The diagram shows a cross-sectional view of the valve cover of a large-opening shut-off valve.

[0021] Reference numerals: Valve body 1, fluid flow channel 101, first fluid flow channel 1011, second fluid flow channel 1012, cut-off plate 1013, installation channel 102, cut-off hole 103, valve cover 2, installation groove 201, packing groove 202, valve cover through hole 203, connecting hole section 2031, sealing hole section 2032, valve stem assembly 3, valve stem body 301, sealing section 303, snap ring 304, first section 305, second section 306, limiting part 307, valve core 4, valve disc 401, installation section 4011, assembly section 4012, gasket 402, sealing packing 5, elastic retaining ring 6, spring 7, sealing ring 8. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] like Figure 1 and Figure 2 As shown, in one implementation, this application provides a shut-off valve, including a valve body 1, a valve cover 2, a valve stem assembly 3, a valve core 4, and a spring 7. The valve cover 2 is installed on the valve body 1, the valve stem assembly 3 is installed on the valve cover 2, and one end of the valve stem assembly 3 extends into the valve body 1 and the other end extends out of the valve cover 2. The valve core 4 is installed at the end of the valve stem assembly 3 and is located inside the valve body 1. The spring 7 is connected to the valve cover 2 and the valve stem assembly 3 respectively, and is used to drive the valve stem assembly 3 to move.

[0024] The valve body 1 has a liquid flow channel 101 and an installation channel 102. The liquid flow channel 101 is connected to the installation channel 102. A flow-stopping hole 103 is formed in the liquid flow channel 101. One end of the flow-stopping hole 103 opens towards the installation channel 102.

[0025] The valve cover 2 is installed at the end of the mounting channel 102 away from the liquid flow channel 101, and the valve stem assembly 3 extends at least partially into the mounting channel 102. Along the axial direction of the mounting channel 102, the valve stem assembly 3 is movable relative to the valve cover 2.

[0026] The valve core 4 is located within the mounting channel 102 and is mounted at the end of the valve stem assembly 3 facing the fluid flow channel 101.

[0027] Under the action of the valve stem assembly 3, the valve core 4 has a closed state and an open state, and the valve core 4 switches between the closed state and the open state.

[0028] When the valve core 4 is in the closed state, the valve core 4 abuts against the end opening of the throttling hole 103, the throttling hole 103 is closed, and the liquid cannot flow through the liquid flow channel 101.

[0029] When the valve core 4 is in the open state, the valve core 4 is separated from the choke hole 103, the choke hole 103 is opened, and the liquid can flow through the liquid flow channel 101.

[0030] The valve stem assembly 3 includes a first section 305 extending out of the valve cover 2, a second section 306 extending into the mounting channel 102, and a limiting part 307. The limiting part 307 is fixed to the first section 305, and the valve core 4 is mounted on the end of the second section 306 away from the first section 305. A spring 7 is mounted between the limiting part 307 and the valve cover 2. The spring 7 is connected to both the limiting part 307 and the end of the valve cover 2 away from the valve body 1. That is, the spring 7 is mounted on the outside of the valve cover 2, thereby increasing the movement of the valve core 4 in the liquid flow channel 101 and the mounting channel 102, thus increasing the opening of the shut-off valve and reducing the impact of the shut-off valve on the liquid flow rate.

[0031] To more clearly describe the technical solution of this application, the following are defined: Figure 1 The vertical direction is shown. Here, the direction along the axis of the mounting channel 102 refers to... Figure 1 The up and down directions in the middle.

[0032] In this implementation, the spring 7 is used to provide an upward force on the valve stem assembly 3, so that the valve core 4 is separated from the shut-off orifice 103 under normal conditions. When it is necessary to close the shut-off valve, the valve stem assembly 3 is driven to move toward the shut-off orifice 103 by external components such as cylinders, thereby closing the shut-off orifice 103 and preventing liquid from flowing through the liquid flow channel 101.

[0033] like Figure 1 As shown, in one implementation, the valve stem assembly 3 includes a valve stem body 301, which extends at least partially beyond the valve cover 2 to form a first segment 305. A limiting portion 307 is detachably mounted on the end of the first segment 305 away from the valve body 1. Along the axial direction of the valve stem assembly 3, the outer edge of the limiting portion 307 protrudes beyond the outer edge of the first segment 305.

[0034] Specifically, the outer diameter of the limiting part 307 is larger than the diameter of the valve stem body 301, so that the spring 7 abuts against the end face of the limiting part 307 facing the spring 7.

[0035] More specifically, the limiting part 307 is a two-section stepped shaft, and an external thread is formed on the circumferential side wall of the shaft section of the limiting part 307 facing the valve stem body 301, so that the limiting part 307 can be installed on the valve stem body 301 by the thread.

[0036] In one implementation, the spring 7 is sleeved on the outside of the first section 305, and its two ends abut against the limiting part 307 and the valve cover 2 respectively, so as to connect the spring to the valve stem assembly 3 through the limiting part 307.

[0037] It should be noted that the limiting part 307 can be a cylinder or a multi-segment stepped shaft. This implementation does not restrict the shape of the limiting part 307. However, it is necessary to ensure that the outer diameter of the limiting part 307 is larger than that of the valve stem body 301 so that the spring 7 can abut against the limiting part 307.

[0038] As another implementation, the limiting part 307 and the valve stem body 301 can be an integral structure.

[0039] In one implementation, a mounting groove 201 is formed at the end of the valve cover 2 away from the liquid flow channel 101, and the spring 7 extends into the mounting groove 201 towards the end of the valve cover 2.

[0040] Specifically, the mounting groove 201 is annular and coaxially arranged with the valve stem body 301 to facilitate the positioning of the spring 7 and improve the stability of the spring 7 installation.

[0041] As one implementation, the valve stem assembly 3 also includes a sealing section 303. Along the axial direction of the valve stem assembly 3, the sealing section 303 is connected to the middle part of the valve stem body 301, and the sealing section 303 is located inside the valve cover 2, so that the valve stem assembly 3 and the valve cover 2 are sealed together.

[0042] As one implementation, the shut-off valve also includes a sealing ring 8, which is fitted onto the end of the sealing section 303 facing the first section 305.

[0043] The sealing ring 8 is used to increase the sealing performance between the sealing section 303 and the valve cover 2, thereby preventing liquid from flowing out of the installation channel 102 of the valve body 1 and improving the sealing performance of the shut-off valve.

[0044] like Figure 4 As shown, in one implementation, the valve cover 2 has a valve cover through hole 203, which extends along the axial direction of the mounting channel 102. The valve stem assembly 3 is installed in the valve cover through hole 203, and both ends of the valve stem assembly 3 extend to the outside of the valve cover through hole 203.

[0045] The valve cover through hole 203 includes a connecting hole section 2031 and a sealing hole section 2032. The sealing hole section 2032 is located at the end of the connecting hole section 2031 facing the liquid flow channel 101. A limiting step 2033 is formed at the connection between the connecting hole section 2031 and the sealing hole section 2032. The sealing section 303 is installed in the sealing hole section 2032 to improve the sealing performance between the valve stem assembly 3 and the valve cover 2. The limiting step 2033 also limits the upward movement of the valve stem assembly 3 to prevent the valve stem assembly 3 from moving too much upward, which could cause the valve stem assembly 3 to separate from the valve cover 2.

[0046] Specifically, the connecting hole section 2031 is connected to the mounting groove 201, so that the spring 7 is sleeved on the outer side of the valve stem body 301 extending to the connecting hole section 2031.

[0047] like Figure 3 As shown, as one implementation, the large-opening shut-off valve also includes a sealing packing 5, which is installed on the end of the valve cover 2 facing the liquid flow channel 101, and the sealing packing 5 is sealed on the circumferential side wall of the sealing section 303 of the valve stem assembly 3.

[0048] The sealing packing 5 is used to further improve the sealing performance between the valve cover 2 and the valve stem assembly 3, thereby further improving the sealing performance of the gate valve.

[0049] It should be noted that the height of the sealing section 303 along the axis of the installation channel 102 is greater than the stroke of the valve core 4 when switching from the closed state to the open state, ensuring that the sealing packing 5 always abuts against the circumferential side wall of the sealing section 303, thereby improving the sealing performance between the valve cover 2 and the valve stem assembly 3.

[0050] As one implementation method, in order to facilitate the installation of the sealing packing 5, a packing groove 202 is formed at the end of the valve cover 2 facing the liquid flow channel 101, and the sealing packing 5 is installed in the packing groove 202.

[0051] The packing groove 202 is located at one end of the sealing hole section 2032 facing the liquid flow channel 101, and the outer diameter of the packing groove 202 is larger than the outer diameter of the sealing hole section 2032, so that the packing groove 202 is located on the outside of the valve stem assembly 3.

[0052] Specifically, an elastic retaining ring 6 is installed below the sealing packing 5, and the sealing packing 5 is installed in the packing groove 202 by means of the elastic retaining ring 6.

[0053] like Figure 3 As shown, in one implementation, the valve core 4 includes a valve disc 401 and a gasket 402. The valve disc 401 is installed at the end of the valve stem assembly 3 facing the liquid flow channel 101; the gasket 402 is installed at the end of the valve disc 401 facing the throttling hole 103.

[0054] Specifically, the outer diameter of the gasket 402 and the maximum diameter of the valve disc 401 are both larger than the diameter of the choke hole 103. The gasket 402 seals the gap between the valve disc 401 and the opening of the choke hole 103 toward the valve core 4, so that when the valve core 4 is in the closed state, the gasket 402 blocks the choke hole 103, preventing liquid from flowing through the liquid flow channel 101.

[0055] As one implementation, a snap ring 304 is formed at the end of the valve stem assembly 3 facing the fluid flow channel 101. The snap ring 304 is installed inside the valve disc 401 of the valve core 4. The snap ring 304 limits the valve disc 401 to be installed at the end of the valve stem assembly 3, thereby improving the convenience of installing the valve disc 401.

[0056] Specifically, a countersunk hole is formed inside the valve disc 401. The countersunk hole is a stepped hole. The snap ring 304 is installed inside the countersunk hole of the valve disc 401 to prevent the valve disc 401 from falling off from the end of the valve stem assembly 3.

[0057] In one implementation, the valve disc 401 is a stepped shaft, including a mounting section 4011 and an assembly section 4012. The mounting section 4011 is mounted on the end of the valve stem assembly 3, and the assembly section 4012 is located at the end of the mounting section 4011 facing the fluid flow channel 101.

[0058] Gasket 402 is fitted on the outside of assembly section 4012 and is limited on assembly section 4012 by elastic retaining ring, so that gasket 402 abuts against installation section 4011, improving the sealing performance of valve core 4 and shut-off hole 103 when valve core 4 is in closed state.

[0059] Specifically, the diameter of the installation section 4011 is larger than the inner diameter of the intercepting hole 103, and the diameter of the assembly section 4012 is smaller than the inner diameter of the intercepting hole 103.

[0060] As one implementation, the liquid flow channel 101 includes a first liquid flow channel 1011 and a second liquid flow channel 1012, and a flow cut-off plate 1013 is formed in the liquid flow channel 101. The first liquid flow channel 1011 and the second liquid flow channel 1012 are located on both sides of the flow cut-off plate 1013, and the flow cut-off hole 103 is located in the middle of the flow cut-off plate 1013.

[0061] Specifically, the end face of the baffle plate 1013 facing the valve core 4 is perpendicular to the axis of the mounting channel 102.

[0062] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0063] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0064] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A shut-off valve, characterized in that, include: Valve body (1); Valve cover (2), the valve cover (2) is mounted on the valve body (1); A valve stem assembly (3) is provided through the valve cover (2). Along the axial direction of the valve stem assembly (3), the valve stem assembly (3) includes a limiting part (307) and a first section (305) extending outside the valve cover (2). The limiting part (307) is fixed to the first section (305). A spring (7) is mounted between the limiting part (307) and the valve cover (2) along the axial direction of the valve stem assembly (3).

2. A shut-off valve according to claim 1, characterized in that, The valve stem assembly (3) includes a valve stem body (301) that extends at least partially beyond the valve cover (2) to form a first segment (305); The limiting part (307) is detachably installed at the end of the first segment (305) away from the valve body (1), and along the axial direction of the valve stem assembly (3), the outer edge of the limiting part (307) protrudes from the outer edge of the first segment (305).

3. A shut-off valve according to claim 1 or 2, characterized in that, The spring (7) is sleeved on the outside of the first segment (305).

4. A shut-off valve according to claim 1, characterized in that, The valve cover (2) has a mounting groove (201) formed at the end facing the first section (305); The spring (7) extends into the mounting groove (201) at the end facing the valve cover (2).

5. A shut-off valve according to claim 1, characterized in that, The valve stem assembly (3) includes a valve stem body (301) and a sealing section (303). Along the axial direction of the valve stem assembly (3), the sealing section (303) is connected to the valve stem body (301) and is located inside the valve cover (2) so that the valve stem assembly (3) is sealed to the valve cover (2).

6. A shut-off valve according to claim 5, characterized in that, The shut-off valve also includes a sealing packing (5), which is installed on the end of the valve cover (2) away from the first section (305) and is sealed on the circumferential sidewall of the sealing section (303).

7. A shut-off valve according to claim 6, characterized in that, The shut-off valve also includes a sealing ring (8), which is sleeved on the end of the sealing section (303) facing the first section (305).

8. A shut-off valve according to claim 6, characterized in that, The valve cover (2) has a valve cover through hole (203) for installing the valve stem assembly (3), and the valve cover through hole (203) has a limiting step (2033) for limiting the sealing section (303).

9. A shut-off valve according to claim 6, characterized in that, The valve cover (2) has a packing groove (202) formed at the end opposite to the first section (305), and the packing groove (202) is located on the outside of the valve stem assembly (3); The sealing filler (5) is installed in the filler groove (202).

10. A shut-off valve according to claim 1, characterized in that, The shut-off valve also includes a valve core (4), which is mounted on the end of the valve stem assembly (3) away from the first segment (305); The valve core (4) has a closed state when the shut-off valve is closed and an open state when the shut-off valve is open.

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