Throttling stop valve

Abstract

The throttling stop valve comprises a valve body, a valve cover arranged on the valve body and a valve rod movably connected with the valve cover, the valve rod comprises a valve rod body and a valve needle arranged at the lower end of the valve rod body, the upper end of the valve rod body penetrates out of the valve cover to be connected with an operating handle, and the valve body is provided with a first fluid channel and a second fluid channel. The first fluid channel and the second fluid channel are communicated through a valve cavity, a throttling sealing piece is arranged in the valve cavity, and the throttling sealing piece comprises a valve seat, a rubber seat arranged at the lower end of the valve seat and a throttling sealing channel penetrating through the valve seat and the rubber seat in the axial direction of the valve rod. The valve needle or the throttling sealing channel is of a columnar structure which is gradually reduced towards the central axis from top to bottom, the valve needle stretches into the throttling sealing channel, and the lower end of the valve needle is tightly matched with the rubber base. The throttling sealing piece is provided with the independent valve seat and the independent rubber seat, the friction torque at the end of the valve needle is reduced by means of the characteristics of the rubber seat, and the valve needle is prevented from being broken off while closure of the valve needle is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a throttling stop valve. Background Art

[0002] The throttle stop valve is a key part of the instrument measurement pipeline system, which can accurately adjust or cut off the fluid. The existing throttle stop valve adjusts the fluid flow rate by changing the flow area of ​​the long valve needle and the throttle hole, or closes the valve by rotating the valve needle and fitting the port of the throttle hole.

[0003] However, as the throttling accuracy continues to improve, the diameter of the valve needle is less than 1 mm. When the user rotates the external operating handle to turn the valve needle to adjust or close the throttling hole, the valve needle is too small in diameter. When the manual torque transmitted to the valve needle is greater than the shear stress of the valve needle, it is easy to cause the valve needle to break, resulting in failure of the throttling stop valve. Summary of the invention

[0004] In order to overcome the above defects, the utility model provides a throttling stop valve, which can accurately adjust or cut off the fluid, has a simple structure and prolongs the service life of the valve needle.

[0005] The utility model adopts the following technical scheme to solve the technical problems: a throttling stop valve is provided, comprising a valve body, a valve cover arranged on the valve body, and a valve stem movably connected to the valve cover, the valve stem comprising a valve stem body and a valve needle arranged at the lower end of the valve stem body, the upper end of the valve stem body passes through the valve cover and is connected to an operating handle, the valve body is provided with a first fluid channel and a second fluid channel, the first fluid channel and the second fluid channel are connected through a valve cavity, a throttling seal is provided in the valve cavity, the throttling seal comprises a valve seat, a rubber seat arranged at the lower end of the valve seat, and a throttling sealing channel which penetrates the valve seat and the rubber seat along the axial direction of the valve stem, the valve needle or the throttling sealing channel is a columnar structure which gradually decreases from top to bottom and toward the central axis, the valve needle extends into the throttling sealing channel and its lower end portion is tightly matched with the rubber seat.

[0006] As a further improvement of the utility model, the throttling sealing channel includes a throttling channel arranged on the valve seat and a sealing channel arranged on the rubber seat, and the radial dimension of the throttling channel is larger than the radial dimension of the sealing channel.

[0007] As a further improvement of the present invention, the axial dimension of the valve needle is larger than the axial dimension of the throttling sealing channel, and the upper end of the valve needle is integrally connected to the valve stem body through a tapered portion.

[0008] As a further improvement of the present utility model, the valve seat is in a T shape, having a horizontal portion and a vertical portion. A receiving groove with a top opening and communicating with the throttling and sealing channel is provided in the middle of the horizontal portion, and a communication hole communicating with the first fluid channel is provided on the groove wall of the receiving groove.

[0009] As a further improvement of the present utility model, the valve cavity includes a first installation cavity and a second installation cavity arranged up and down. The horizontal portion of the valve seat is placed in the first installation cavity, and a sealing gasket is provided between the lower end surface of the horizontal portion and the first installation cavity.

[0010] The rubber seat is connected to the lower end of the vertical portion of the valve seat, and the rubber seat and the vertical portion are placed in the second installation cavity. A connection channel extending axially downward along the valve stem and communicating with the second fluid channel is provided at the bottom of the second installation cavity.

[0011] As a further improvement of the present utility model, when the valve cover is screwed onto the valve body, the lower end surface of the valve cover abuts against the upper end surface of the throttling and sealing member.

[0012] A through channel for the valve stem body to pass through is provided axially in the middle of the valve cover, and the through channel is docked with the receiving groove.

[0013] As a further improvement of the present utility model, a limiting sliding table for restricting the axial movement of the valve stem along the through channel is provided on the valve stem body. A plurality of the limiting sliding tables are arranged at intervals near the lower end of the valve stem body, and a first O-ring is provided between the two lowermost limiting sliding tables.

[0014] As a further improvement of the present utility model, a clamping portion for tool clamping is provided on the outer peripheral wall of the valve cover.

[0015] A second O-ring is provided between the inner side of the port of the valve body and the docking position opposite to the valve cover.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1. By setting the throttling and sealing member as an independent valve seat and rubber seat, and utilizing the self-characteristics of the rubber seat, the frictional torque at the end of the valve needle is reduced. While the valve needle throttles, the breakage of the valve needle is prevented.

[0018] 2. By setting the valve needle as a cylindrical shape with a gradually changing radial dimension, the throttling area of the throttling and sealing channel changes when the valve needle moves axially, thereby realizing the fine adjustment of the fluid flow rate or pressure.

[0019] 3. By setting the axial dimension of the valve needle to be greater than the axial dimension of the throttling seal channel, it is possible to prevent the contact between the valve needle and the port of the throttling seal channel in the throttling state, further preventing the valve needle from breaking from the upper part;

[0020] 4. By setting a limit sliding table on the valve stem, the stability of the axial movement of the valve stem can be ensured;

[0021] 5. By setting a seal, the sealing performance of the throttle stop valve can be improved, and at the same time, the reliability of its throttling and shut-off is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present utility model;

[0023] Figure 2 is a schematic cross-sectional view of the present utility model in the A-A direction;

[0024] Figure 3 is a schematic cross-sectional view of the valve body and valve cover of the present utility model;

[0025] Figure 4 is a schematic cross-sectional view of the valve stem and throttling seal of the present utility model.

[0026] The following description is made in conjunction with the accompanying drawings:

[0027] 1. Valve body; 11. First fluid passage; 12. Second fluid passage; 13. Valve cavity; 131. First installation cavity; 132. Second installation cavity; 133. Connection passage; 2. Valve cover; 21. Through passage; 22. Clamping portion; 3. Valve stem; 31. Valve stem body; 311. Limit sliding table; 32. Valve needle; 33. Conical portion; 4. Throttling seal; 41. Valve seat; 411. Throttling passage; 412. Horizontal portion; 413. Vertical portion; 414. Accommodation groove; 4141. Communication hole; 42. Rubber seat; 421. Seal passage; 43. Throttling seal passage; 5. Sealing gasket; 6. First O-ring; 7. Second O-ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following is a detailed description of a preferred embodiment of the present utility model in conjunction with the accompanying drawings.

[0029] Refer to Figures 1 to 4, a throttle stop valve provided by the present utility model includes a valve body 1, a valve cover 2 provided on the valve body 1, and a valve stem 3 movably connected to the valve cover 2. The valve stem 3 includes a valve stem body 31 and a valve needle 32 provided at the lower end of the valve stem body 31. The upper end of the valve stem body 31 passes through the valve cover 2 and is connected to an operating handle (not shown in the figure). The valve body 1 is provided with a first fluid passage 11 and a second fluid passage 12, and the first fluid passage 11 and the second fluid passage 12 are connected through a valve chamber 13. A throttle seal 4 is provided in the valve chamber 13. The throttle seal 4 includes a valve seat 41, a rubber seat 42 provided at the lower end of the valve seat 41, and a throttle seal passage 43 axially penetrating through the valve seat 41 and the rubber seat 42 along the valve stem 3. The valve needle 32 or the throttle seal passage 43 is a columnar structure that gradually narrows from top to bottom and towards the central axis, which is a cylinder that gradually narrows from top to bottom and towards the central axis. The valve needle 32 extends into the throttle seal passage 43 and its lower end is in close fit with the rubber seat 42 to achieve throttling. The valve stem 3 can move up and down along its axis under the drive of the operating handle. The movement of the valve stem 3 driven by the operating handle belongs to the prior art and will not be elaborated here.

[0030] Taking the valve needle 32 as a cylindrical structure with a gradually changing radial dimension and the throttle seal passage 43 as a cylindrical structure as an example, when the operating handle drives the valve stem 3 to move along its axis, the valve needle 32 moves axially relative to the throttle seal passage 43. As the position of the valve needle 32 changes, the throttling area formed by it and the throttle seal passage 43 changes accordingly, thereby realizing fine adjustment of the fluid flow rate or pressure. When throttling is required, the valve needle 32 moves downward so that its lower end is inserted into the rubber seat 42 made of rubber. When the valve needle 32 is inserted, it forms a plastic seal with the rubber, and the frictional torque between the valve needle 32 and the rubber seat 42 is absorbed by the rubber material, reducing its frictional stress to protect the valve needle from being broken and achieving the technical effect of throttling. When the valve needle disengages from the rubber seat 42, the valve opens to realize the adjustment of the fluid flow rate or pressure. It can be understood that, conversely, if the valve needle 32 is a cylindrical structure and the throttle seal passage 43 is a cylindrical structure with a gradually changing radial dimension, the throttling and throttling processes are the same as the above principle.

[0031] Furthermore, the throttle seal passage 43 includes a throttle passage 411 provided on the valve seat 41 and a seal passage 421 provided on the rubber seat 42. The radial dimension of the throttle passage 411 is larger than that of the seal passage 421. The independent setting of the throttle passage 411 and the seal passage 421 ensures the sealing performance of the valve. The lower end of the valve needle 32 and the seal passage 421 of the rubber seat 42 are in interference fit to ensure the reliability of throttling. Since the rubber seat 42 made of rubber has a certain elasticity, it is in soft contact with the end of the valve needle 32, which can avoid the valve needle 32 from being broken due to excessive force and ensure the reliability of sealing, especially suitable for working conditions where the diameter of the valve needle is less than 1m.

[0032] Furthermore, the axial dimension of the valve needle 32 is greater than that of the throttling seal channel 43, and the upper end of the valve needle 32 is integrally connected to the valve stem body 31 through a tapered portion 33. That is, in the throttling state of the throttle stop valve, the connection between the valve needle 32 and the tapered portion 33 has no contact with the port of the throttling seal channel 43, thus avoiding the risk of the valve needle 32 breaking from its upper end.

[0033] Furthermore, the valve seat 41 is in a T shape, having a horizontal portion 412 and a vertical portion 413. A receiving groove 414 with a top opening and communicating with the throttling seal channel 43 is provided in the middle of the horizontal portion 412. A communication hole 4141 communicating with the first fluid channel 11 is provided on the groove wall of the receiving groove 414. The valve cavity 13 includes a first installation cavity 131 and a second installation cavity 132 arranged up and down. The horizontal portion 412 of the valve seat 41 is placed in the first installation cavity 131, and a gasket 5 is provided between the lower end surface of the horizontal portion 412 and the first installation cavity 131; the rubber seat 42 is connected to the lower end of the vertical portion 413 of the valve seat 41 and both are placed in the second installation cavity 132. A connection channel 133 extending axially downward along the valve stem 3 and communicating with the second fluid channel 12 is provided at the bottom of the second installation cavity 132. Thus, the fluid can enter the throttling seal channel 43 from the first fluid channel 11 through the communication hole 4141 and flow out from the second fluid channel 12 through the connection channel 133. Thus, when the valve needle 32 moves axially, the flow rate or pressure entering the second fluid channel 12 can be adjusted; by providing the gasket 5, the fluid is prevented from flowing from the valve cavity 13 into the connection channel 133 to ensure the throttling and shut-off effects of the throttle stop valve.

[0034] Furthermore, when the valve cover 2 is screwed onto the valve body 1, the lower end face of the valve cover 2 abuts against the upper end face of the throttling seal 4; a through channel 21 for the valve stem body 31 to pass through is provided axially in the middle of the valve cover 2, and the through channel 21 is docked with the receiving groove 414, thus ensuring the axial movement of the valve stem 3 to achieve the axial movement of the valve needle 32 along the throttling seal channel 43 and avoiding the valve needle 32 from moving and offsetting and breaking.

[0035] Furthermore, a limiting sliding table 311 for restricting the axial movement of the valve stem 3 along the through channel 21 is provided on the valve stem body 31. A plurality of limiting sliding tables 311 are arranged at intervals near the lower end of the valve stem body 31. A first O-ring 6 is provided between the two lowermost limiting sliding tables 311. The peripheral wall of the limiting sliding table 311 is in sliding fit with the inner wall surface of the through channel 21, reducing the friction force between the valve stem 3 and the valve cover 2 while ensuring the axial movement of the valve stem 3 along the valve cover 2 to achieve the stability of the movement of the valve stem 3. By providing the first O-ring 6, the sealed connection between the valve stem 3 and the valve cover 2 is ensured, preventing the fluid from entering the valve cover 2 upward and not affecting the movement of the valve stem at the same time.

[0036] Further, a clamping portion 22 for tool clamping is provided on the outer peripheral wall of the valve cover 2. The clamping portion 22 has a rhombic peripheral wall to facilitate the assembly or disassembly of the components of the throttle stop valve using tools such as wrenches.

[0037] A second O-ring seal 7 is provided between the inner side of the port of the valve body 1 and the docking position opposite to the valve cover 2 to ensure the sealed connection between the valve body 1 and the valve cover 2.

[0038] In summary, for the throttle stop valve provided by the present utility model, by setting the throttle seal as an independent valve seat and rubber seat and utilizing the self-characteristics of the rubber seat, the frictional torque at the end of the valve needle is reduced. While the valve needle performs throttling, the breakage of the valve needle is prevented. By setting the valve needle as a cylindrical shape with a gradually changing radial dimension, the throttling area of the throttle seal channel changes when the valve needle moves axially, thereby realizing the fine adjustment of the fluid flow rate or pressure. By setting the axial dimension of the valve needle to be greater than the axial dimension of the throttle seal channel, the contact between the valve needle and the port of the throttle seal channel in the throttling state is prevented, further preventing the breakage of the valve needle from the upper part. By providing a limiting slide on the valve stem, the stability of the axial movement of the valve stem is ensured. By providing a seal, the sealing performance of the throttle stop valve is improved, and at the same time, the reliability of its throttling and shut-off is ensured.

[0039] In the above description, many specific details are set forth to facilitate a full understanding of the present utility model. However, the above description is only a preferred embodiment of the present utility model. The present utility model can be implemented in many other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed above. At the same time, any person skilled in the art can, without departing from the scope of the technical solution of the present utility model, make many possible changes and modifications to the technical solution of the present utility model by using the methods and technical contents disclosed above, or modify it into equivalent embodiments with equivalent changes. All modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the content of the technical solution of the present utility model still fall within the scope of protection of the technical solution of the present utility model.

Claims

1. A throttling stop valve, comprising a valve body (1), a valve cover (2) arranged on the valve body (1), and a valve stem (3) movably connected to the valve cover (2), wherein the valve stem (3) comprises a valve stem body (31) and a valve needle (32) arranged at the lower end of the valve stem body (31), and the upper end of the valve stem body (31) passes through the valve cover (2) and is connected to an operating handle, characterized in that: The valve body (1) is provided with a first fluid channel (11) and a second fluid channel (12), the first fluid channel (11) and the second fluid channel (12) are connected through a valve cavity (13), a throttling seal (4) is provided in the valve cavity (13), the throttling seal (4) comprises a valve seat (41), a rubber seat (42) provided at the lower end of the valve seat (41), and a throttling seal channel (43) penetrating the valve seat (41) and the rubber seat (42) along the axial direction of the valve stem (3), the valve needle (32) or the throttling seal channel (43) is a columnar structure which gradually narrows from top to bottom and toward the central axis, the valve needle (32) extends into the throttling seal channel (43) and its lower end is tightly matched with the rubber seat (42).

2. The throttle stop valve according to claim 1, characterized in that: The throttling sealing channel (43) comprises a throttling channel (411) provided on the valve seat (41), and a sealing channel (421) provided on the rubber seat (42); the radial dimension of the throttling channel (411) is greater than the radial dimension of the sealing channel (421).

3. The throttle stop valve according to claim 2, characterized in that: The axial dimension of the valve needle (32) is greater than the axial dimension of the throttling sealing channel (43), and the upper end of the valve needle (32) is integrally connected to the valve stem body (31) via a tapered portion (33).

4. The throttle stop valve according to claim 3, characterized in that: The valve seat (41) is T-shaped and has a horizontal portion (412) and a vertical portion (413). A receiving groove (414) with a top opening and connected to the throttling sealing channel (43) is provided in the middle of the horizontal portion (412). A connecting hole (4141) communicating with the first fluid channel (11) is provided on the groove wall of the receiving groove (414).

5. The throttle stop valve according to claim 4, characterized in that: The valve cavity (13) comprises a first installation cavity (131) and a second installation cavity (132) which are arranged vertically, the horizontal portion (412) of the valve seat (41) is placed in the first installation cavity (131), and a sealing gasket (5) is provided between the lower end surface of the horizontal portion (412) and the first installation cavity (131); The rubber seat (42) is connected to the lower end of the vertical portion (413) of the valve seat (41), and the rubber seat (42) and the vertical portion (413) are placed in the second installation cavity (132). The bottom of the second installation cavity (132) is provided with a connecting channel (133) extending axially downward along the valve stem (3) and communicating with the second fluid channel (12).

6. The throttle stop valve according to claim 4, characterized in that: When the valve cover (2) is screwed onto the valve body (1), the lower end surface of the valve cover (2) abuts against the upper end surface of the throttling seal (4); A through channel (21) for the valve stem body (31) to pass through is axially provided in the middle of the valve cover (2), and the through channel (21) is butted against the accommodating groove (414).

7. The throttle stop valve according to claim 6, characterized in that: The valve stem body (31) is provided with a limiting slide (311) for limiting the axial movement of the valve stem (3) along the through channel (21); a plurality of limiting slides (311) are arranged at intervals near the lower end of the valve stem body (31); and a first O-ring (6) is provided between the two limiting slides (311) at the lower end.

8. The throttle stop valve according to claim 7, characterized in that: A clamping portion (22) for clamping a tool is provided on the outer peripheral wall of the valve cover (2); A second O-ring (7) is provided between the inner side of the port of the valve body (1) and the position where the valve cover (2) contacts each other.

Images