Valve rod of pneumatic stop valve

Abstract

The utility model relates to the technical field of stop valves, and discloses a pneumatic stop valve rod which comprises a valve body, flange plates are arranged at the two ends of the valve body respectively, a partition plate is arranged in the valve body, a supporting plate is fixedly connected to the valve body, and an operation table is fixedly connected to the supporting plate. According to the utility model, the upper cavity in the valve body is communicated with the liquid inlet, the pneumatic actuator is controlled by the pneumatic controller, when the valve needs to be closed, an electric signal is transmitted to the pneumatic actuator by the pneumatic controller, and the output end of the pneumatic actuator extends out to drive the connecting rod to move downwards to be matched with the pressing ring to push the valve clack downwards, so that the valve is closed. By means of the smooth cambered surface at one end of the valve clack, the valve clack can be placed in the large flow liquid through hole more easily, when the large flow liquid through hole is completely blocked by the sealing ring on the valve clack and the sealing gasket is pressed on the upper portion of the valve clack to completely block the small flow liquid through hole, liquid on one side is completely sealed through blocking of the partition plate, and the purpose of sealing a liquid channel is achieved.

Description

Technical Field

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

[0002] The closing principle of a globe valve is that, relying on the pressure of the valve stem, the sealing surface of the valve flap is closely attached to the sealing surface of the valve seat to prevent the medium from flowing through. As an extremely important cut-off valve, its sealing is achieved by applying torque through the valve stem. The valve stem applies pressure to the valve flap in the axial direction, making the sealing of the valve flap closely attached to the sealing surface of the valve seat, preventing the medium from leaking along the gap between the sealing surfaces. The sealing pair of the globe valve consists of the sealing surface of the valve flap and the sealing surface of the valve seat.

[0003] When a common globe valve is opened, affected by the pressure difference between the two cavities, it is difficult for the valve flap to move out of the valve body. Manual valve opening is laborious, and at the same time, the valve flap may be unevenly stressed, causing unnecessary wear. Therefore, the utility model proposes a valve stem of a pneumatic globe valve to solve the problems existing in the prior art. Content of the Utility Model

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and a valve stem of a pneumatic globe valve is proposed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A valve stem of a pneumatic globe valve, including a valve body, flange plates are respectively provided at both ends of the valve body, a partition plate is provided inside the valve body, a support plate is fixedly connected to the valve body, an operating platform is fixedly connected to the support plate, a pneumatic actuator is fixedly connected inside the operating platform, a connecting rod is fixedly connected to the output end of the pneumatic actuator, a support plate is fixedly connected to the operating platform by bolts, a pneumatic controller is fixedly connected to the support plate, a pressure ring is provided on the connecting rod, a sealing gasket is fixedly connected below the pressure ring, a pull ring is provided on the connecting rod, and a valve flap is slidably connected to one end of the connecting rod.

[0006] As a further description of the above technical scheme:

[0007] A support block is fixedly connected to the pull ring, a small liquid flow through hole is provided on the valve flap, the connecting rod slides inside the small liquid flow through hole, a sealing ring is fixedly connected to the valve flap, and a liquid flow opening is provided on the valve flap.

[0008] As a further description of the above technical scheme:

[0009] A large liquid flow through hole is provided on the partition plate, and the large liquid flow through hole is located in the middle of the partition plate.

[0010] As a further description of the above technical scheme:

[0011] The support plate is located below the operating table. The pneumatic actuator is electrically connected to the pneumatic controller. The connecting rod passes through and slides within the valve body. The pressure ring is located outside the valve flap, and the pull ring is located inside the valve flap. The diameter of the pressure ring is larger than the aperture of the small liquid flow through hole, and the diameter of the sealing gasket is larger than the aperture of the small liquid flow through hole.

[0012] As a further description of the above technical solution:

[0013] The valve flap is located within the large liquid flow through hole. The sealing ring fits with the large liquid flow through hole. The bottom of the valve flap is provided with an arc surface. The interior of the valve flap is provided with a cavity. There are four groups of support blocks evenly distributed on the pull ring. All four groups of support blocks are in contact with the inner side of the top of the valve flap, and the sealing gasket is in contact with the outer side of the top of the valve flap.

[0014] As a further description of the above technical solution:

[0015] The partition plate divides the interior of the valve body into upper and lower cavities. The liquid flow opening is located on one side of the bottom of the valve flap, and the liquid flow opening is located within the lower cavity of the valve body.

[0016] As a further description of the above technical solution:

[0017] The materials of the sealing ring and the sealing gasket are nitrile rubber materials. The wear resistance of nitrile rubber is superior to that of many other rubber materials, which enables it to withstand higher frictional forces and extend the service life of the sealing ring.

[0018] The present utility model has the following beneficial effects:

[0019] 1. In the present utility model, the upper cavity within the valve body is connected to the liquid inlet. The pneumatic controller controls the pneumatic actuator. When the valve needs to be closed, the pneumatic controller transmits an electrical signal to the pneumatic actuator, causing the output end of the pneumatic actuator to extend, driving the connecting rod to move downward, and cooperating with the pressure ring to push the valve flap downward. Through the smooth arc surface at one end of the valve flap, it is easier to place the valve flap into the large liquid flow through hole. When the sealing ring on the valve flap completely blocks the large liquid flow through hole and the sealing gasket is pressed tightly above the valve flap to completely block the small liquid flow through hole, the liquid on one side is completely sealed through the barrier of the partition plate, achieving the purpose of closing the liquid passage.

[0020] 2. In the present utility model, the pneumatic actuator is controlled by the pneumatic controller to lift the output end. Driven by the connecting rod, the pressure ring and the sealing gasket are moved away from the small liquid flow through hole. The liquid first enters the cavity of the valve flap through the small liquid flow through hole and flows out to the lower cavity of the valve body through the liquid flow opening below the valve flap, reducing the pressure difference between the upper and lower cavities in the valve body, facilitating the subsequent rising of the connecting rod. The valve flap and the sealing ring are withdrawn from the large liquid flow through hole by the support of the four groups of support blocks. The liquid flowing into the lower cavity of the valve body through the liquid flow opening can also reduce the friction between the sealing ring and the large liquid flow through hole, which helps the connecting rod to withdraw the sealing ring from the large liquid flow through hole. The opening action of the globe valve can be achieved without too much pulling force. Selecting a pneumatic actuator with lower power consumption can also easily achieve the opening work, and effectively reduce the working energy consumption of the pneumatic actuator, improving the service life of the pneumatic actuator. Description of the Drawings

[0021] Figure 1 Schematic three-dimensional structure diagram of a valve stem of a pneumatic globe valve proposed by the present utility model;

[0022] Figure 2 Partial structural cross-section of a valve stem of a pneumatic globe valve proposed by the present utility model Figure 1 ;

[0023] Figure 3 Partial structural cross-section of a valve stem of a pneumatic globe valve proposed by the present utility model Figure 2 ;

[0024] Figure 4 is Figure 3 Enlarged view of part A of

[0025] Legend:

[0026] 1. Valve body; 2. Flange; 3. Support plate; 4. Operating platform; 5. Pneumatic actuator; 6. Support plate; 7. Pneumatic controller; 8. Connecting rod; 9. Pressure ring; 10. Sealing gasket; 11. Pulling ring; 12. Support block; 13. Valve flap; 14. Sealing ring; 15. Liquid flow opening; 16. Partition plate; 17. Large liquid flow through hole; 18. Small liquid flow through hole. Detailed Embodiment

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0028] Refer to Figures 1 - 4, an embodiment provided by the present utility model: a pneumatic globe valve stem, including a valve body 1, flange plates 2 are respectively provided at both ends of the valve body 1, a partition plate 16 is provided inside the valve body 1, a support plate 3 is fixedly connected to the valve body 1, an operating platform 4 is fixedly connected to the support plate 3, a pneumatic actuator 5 is fixedly connected inside the operating platform 4, a connecting rod 8 is fixedly connected to the output end of the pneumatic actuator 5, a support plate 6 is fixedly connected to the operating platform 4 by bolts, a pneumatic controller 7 is fixedly connected to the support plate 6, a pressing ring 9 is provided on the connecting rod 8, a sealing gasket 10 is fixedly connected below the pressing ring 9, a pulling ring 11 is provided on the connecting rod 8, and a valve flap 13 is slidably connected to one end of the connecting rod 8.

[0029] A support block 12 is fixedly connected to the pulling ring 11, a small liquid flow through hole 18 is provided on the valve flap 13, the connecting rod 8 slides inside the small liquid flow through hole 18, a sealing ring 14 is fixedly connected to the valve flap 13, a liquid flow opening 15 is provided on the valve flap 13, a large liquid flow through hole 17 is provided on the partition plate 16, and the large liquid flow through hole 17 is located in the middle of the partition plate 16. The support plate 3 is located below the operating platform 4. The pneumatic actuator 5 and the pneumatic controller 7 are electrically connected. The connecting rod 8 penetrates and slides inside the valve body 1. The pressing ring 9 is located outside the valve flap 13, and the pulling ring 11 is located inside the valve flap 13. The diameter of the pressing ring 9 is larger than the aperture of the small liquid flow through hole 18, and the diameter of the sealing gasket 10 is larger than the aperture of the small liquid flow through hole 18. The valve flap 13 is located inside the large liquid flow through hole 17, and the sealing ring 14 fits with the large liquid flow through hole 17. The bottom of the valve flap 13 is provided with an arc surface, and a cavity is provided inside the valve flap 13. Four groups of support blocks 12 are provided and evenly distributed on the pulling ring 11. All four groups of support blocks 12 are in contact with the inner side of the top of the valve flap 13, and the sealing gasket 10 is in contact with the outer side of the top of the valve flap 13. The partition plate 16 divides the inside of the valve body 1 into upper and lower cavities. The liquid flow opening 15 is located on one side of the bottom of the valve flap 13, and the liquid flow opening 15 is located in the lower cavity of the valve body 1. The materials of the sealing ring 14 and the sealing gasket 10 are nitrile rubber materials. The above design can achieve the opening action of the globe valve without too much pulling force. Selecting a pneumatic actuator 5 with lower power consumption can also easily achieve the opening work, and effectively reduce the working energy consumption of the pneumatic actuator 5 and improve the service life of the pneumatic actuator 5.

[0030] Working principle: During use, the staff installs the valve body 1 in the transportation pipeline through the flange plates 2 at both ends, connects the upper cavity inside the valve body 1 to the liquid inlet, and controls the pneumatic actuator 5 through the pneumatic controller 7. When the valve needs to restrict the passage of liquid, the pneumatic controller 7 transmits an electrical signal to the pneumatic actuator 5, causing the output end of the pneumatic actuator 5 to extend, thereby driving the connecting rod 8 to move downward. Through the pushing of the connecting rod 8 and the cooperation of the pressure ring 9, the valve flap 13 is pushed downward. Due to the smooth arc surface at one end of the valve flap 13, it is easier to place the valve flap 13 into the large liquid flow through hole 17. When the sealing ring 14 on the valve flap 13 completely blocks the large liquid flow through hole 17 and the sealing gasket 10 also firmly presses above the valve flap 13 to completely block the small liquid flow through hole 18, the liquid on one side is completely sealed through the barrier of the partition plate 16, achieving the purpose of closing the liquid passage. When the passage needs to be opened, the pneumatic controller 7 controls the pneumatic actuator 5 to lift the output end. At this time, driven by the connecting rod 8, the pressure ring 9 and the sealing gasket 10 are moved away from the small liquid flow through hole 18. At this time, the liquid first enters the cavity inside the valve flap 13 through the small liquid flow through hole 18 and flows out through the liquid flow opening 15 below the valve flap 13 to the lower cavity of the valve body 1, thereby gradually reducing the pressure difference between the upper and lower cavities inside the valve body 1, facilitating the extraction of the valve flap 13 from the large liquid flow through hole 17 with a smaller force. The continuously rising connecting rod 8 slowly extracts the valve flap 13 and the sealing ring 14 from the large liquid flow through hole 17 through the support of the four groups of support blocks 12. The liquid flowing into the lower cavity of the valve body 1 through the liquid flow opening 15 can reduce the friction between the sealing ring 14 and the large liquid flow through hole 17, which helps the connecting rod 8 to extract the sealing ring 14 from the large liquid flow through hole 17. The opening action of the stop valve can be achieved without too much pulling force. Selecting a pneumatic actuator 5 with lower power consumption can also easily achieve the opening work, and effectively reduce the working energy consumption of the pneumatic actuator 5, improving the service life of the pneumatic actuator 5.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pneumatic stop valve stem, comprising a valve body (1), characterized in that: The valve body (1) is provided with flanges (2) at both ends respectively, a partition plate (16) is provided inside the valve body (1), a support plate (3) is fixedly connected to the valve body (1), an operating table (4) is fixedly connected to the support plate (3), a pneumatic actuator (5) is fixedly connected to the operating table (4), a connecting rod (8) is fixedly connected to the output end of the pneumatic actuator (5), a supporting plate (6) is fixedly connected to the operating table (4) by bolts, a pneumatic controller (7) is fixedly connected to the supporting plate (6), a pressure ring (9) is provided on the connecting rod (8), a sealing gasket (10) is fixedly connected below the pressure ring (9), a pull ring (11) is provided on the connecting rod (8), and a valve flap (13) is slidably connected to one end of the connecting rod (8).

2. A pneumatic stop valve stem according to claim 1, characterized in that: The pull ring (11) is fixedly connected to a support block (12), the valve flap (13) is provided with a small liquid flow hole (18), the connecting rod (8) slides in the small liquid flow hole (18), the valve flap (13) is fixedly connected to a sealing ring (14), and the valve flap (13) is provided with a liquid flow opening (15).

3. The pneumatic stop valve stem according to claim 2, characterized in that: The partition plate (16) is provided with a large liquid flow through hole (17), and the large liquid flow through hole (17) is located in the middle of the partition plate (16).

4. The pneumatic stop valve stem according to claim 3, characterized in that: The support plate (3) is located below the operating table (4), the pneumatic actuator (5) is electrically connected to the pneumatic controller (7), the connecting rod (8) penetrates and slides in the valve body (1), the pressure ring (9) is located outside the valve disc (13), the pull ring (11) is located inside the valve disc (13), the diameter of the pressure ring (9) is larger than the aperture of the small liquid flow hole (18), and the diameter of the sealing gasket (10) is larger than the aperture of the small liquid flow hole (18).

5. The pneumatic stop valve stem according to claim 4, characterized in that: The valve flap (13) is located in a large liquid flow through hole (17), the sealing ring (14) is fitted with the large liquid flow through hole (17), the bottom of the valve flap (13) is provided with an arc surface, the interior of the valve flap (13) is provided with a cavity, the support blocks (12) are provided in four groups and are evenly distributed on the pull ring (11), the four groups of support blocks (12) are all fitted with the top inner side of the valve flap (13), and the sealing gasket (10) is fitted with the top outer side of the valve flap (13).

6. The pneumatic stop valve stem according to claim 5, characterized in that: The partition plate (16) divides the interior of the valve body (1) into two upper and lower cavities; the liquid flow opening (15) is located on one side of the bottom of the valve flap (13); and the liquid flow opening (15) is located in the lower cavity of the valve body (1).

7. The pneumatic stop valve stem according to claim 6, characterized in that: The sealing ring (14) and the sealing gasket (10) are made of nitrile rubber material.

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