A flange cock valve

Abstract

The utility model provides a kind of flange type plug valve, belong to plug valve technical field.It solves the problem of insufficient sealing of plug valve in prior art.The utility model includes plug valve body, plug valve stem, lower valve cover and plug body, lower valve cover and plug valve body lower end are inlaid plug valve body inside is equipped with sealing cavity and plug body is placed in sealing cavity, plug valve body inside is equipped with valve seat, plug body is inlaid connection, recess is equipped in plug body upper end, anti-static spring is installed in recess, plug valve stem lower end is connected with anti-static spring, plug valve stem lower end is peripherally set connection with valve stem guide, plug valve stem is arranged and protrudes the upper end of gland, sealing packing is installed between plug valve body and plug valve stem below gland, chamber is equipped in plug valve stem inside and injection valve and check valve are installed in chamber, injection valve is located check valve upper end.The utility model has the advantages of strong sealing, good safety performance.

Description

Technical Field

[0001] This utility model belongs to the field of plug valve technology and relates to a flanged plug valve. Background Technology

[0002] Flanged plug valves are industrial valves that use flange connections. They have a compact structure and reliable sealing, and are suitable for flammable and explosive media in the petroleum, chemical and other fields. They can realize the rapid opening and closing of media and flow control in industrial pipeline systems. They also have the characteristics of safety and easy maintenance, ensuring stable and efficient operation.

[0003] Chinese patent publication number CN205715952U discloses a plug valve, including a valve body, a plug, a knob, and a power transmission mechanism. The valve body has a through hole in the horizontal direction and a receiving cavity with a top opening in the vertical direction. The plug is coaxially nested in the receiving cavity. The plug has a through hole in the horizontal direction. The knob covers the top opening. The power transmission mechanism is located between the plug and the knob, and separates and seals the receiving cavity. In addition, the power transmission mechanism senses the rotational displacement of the knob in the horizontal plane and rotates accordingly. The upper surface of the plug has an arc-shaped protrusion, and the bottom of the power transmission mechanism has a corresponding arc-shaped groove. The bottom of the power transmission mechanism has a protruding prism in the central axis direction, and the top of the plug has a prism-shaped groove in the central axis direction. The prism is nested in the prism-shaped groove.

[0004] In the plug valve provided by this patent, the power transmission mechanism needs to rotate with the knob, and there must be an annular gap between it and the fixed valve body cavity. However, no standard rotating shaft sealing assembly is provided, which is insufficient in terms of sealing performance. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by providing a flanged plug valve.

[0006] The objective of this utility model can be achieved through the following technical solution: A flanged plug valve includes a plug valve body, a plug valve stem, a lower valve cover, and a plug body. The lower valve cover is fitted to the lower end of the plug valve body, and a double-ended bolt is fixed through and fixed to the lower end of the plug valve body and the lower valve cover. A sealing cavity is formed inside the plug valve body, and the plug body is placed in the sealing cavity. A valve seat is installed inside the plug valve body, and the plug body is fitted and connected to the valve seat. A groove is formed at the upper end of the plug body, and an anti-static spring is installed in the groove. The lower end of the valve stem is connected to an anti-static spring. A valve stem guide is sleeved around the lower end of the plug valve stem. A pressure cap is fixedly installed on the upper end of the plug valve body. The plug valve stem passes through and extends out of the pressure cap. A sealing packing is installed between the plug valve body and the plug valve stem below the pressure cap. A chamber is opened inside the plug valve stem, and an injection valve and a check valve are installed in the chamber. The injection valve is located above the check valve. A handle is sleeved around the outer periphery of the plug valve stem near the top end, and a handle is connected to the handle.

[0007] In the aforementioned flanged plug valve, a metal gasket is installed between the lower valve cover and the plug valve body. An adjusting bolt is installed inside the lower valve cover. An adjusting cavity is opened in the lower valve cover at the upper end of the adjusting bolt, and a thrust washer is installed in the adjusting cavity.

[0008] In the aforementioned flanged plug valve, an oil injection nozzle is fixedly installed at the upper end of the plug body, and the oil injection nozzle is connected to the interior of the plug body.

[0009] In the aforementioned flanged plug valve, a limiting protrusion is formed near the lower end of the plug valve stem, and a sliding washer is installed on the upper end of the limiting protrusion.

[0010] Compared with the prior art, the flanged plug valve provided by this utility model has the following advantages: 1. The plug body and valve seat fit together to form the main seal, which, together with the sealing packing and metal gasket, achieves triple sealing protection, significantly reducing the risk of leakage. Moreover, the clamping force between the plug body and valve seat can be precisely adjusted by adjusting the bolts and thrust washers to ensure long-term stable sealing; 2. The anti-static spring in the groove of the plug body tightly connects the valve stem and the plug body, forming an electrostatic path and effectively dissipating the static electricity generated during valve operation; 3. Without disassembling the valve body or stopping the pipeline medium transportation, sealing grease or lubricating grease can be directly injected into the sealing part through the injection valve integrated inside the valve stem, making the operation efficient and convenient. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model from another angle.

[0012] In the diagram: 1. Plug valve body; 110. Sealing cavity; 120. Valve seat; 2. Plug valve stem; 21. Limiting protrusion; 22. Chamber; 3. Lower valve cover; 31. Adjusting cavity; 4. Plug body; 41. Groove; 5. Double-ended bolt; 6. Antistatic spring; 7. Valve stem guide; 8. Gland; 9. Sealing packing; 10. Injection valve; 11. Check valve; 12. Handle; 13. Handle; 14. Metal gasket; 15. Adjusting bolt; 16. Thrust washer; 17. Oil injector; 18. Sliding washer. Detailed Implementation

[0013] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0014] like Figures 1 to 2 As shown, this embodiment includes a plug valve body 1, a plug valve stem 2, a lower valve cover 3, and a plug 4. The lower valve cover 3 is fitted to the lower end face of the plug valve body 1, and the two are fastened together by double-headed bolts 5 that are inserted and fixed in the lower end of the plug valve body 1 and the lower valve cover 3, ensuring the sealing and structural stability of the bottom of the valve body. The plug valve body 1 has a sealing cavity 110 for accommodating the plug 4. The plug 4 is rotatably placed in the sealing cavity 110. A valve seat 120 is also installed inside the plug valve body 1. The plug 4 is tightly fitted and connected to the valve seat 120 to ensure the sealing performance when the valve is closed.

[0015] like Figures 1 to 2 As shown, a groove 41 is formed on the upper end face of the plug body 4. An antistatic spring 6 is installed in the groove 41. The lower end of the plug valve stem 2 extends into the groove 41 and is connected to the antistatic spring 6. Through the elastic action of the antistatic spring 6, it is ensured that the plug valve stem 2 and the plug body 4 always maintain good electrical contact, thereby effectively dissipating the static electricity generated during operation and improving the safety of valve use. A valve stem guide 7 is sleeved and connected to the outer periphery of the lower end of the plug valve stem 2. The valve stem guide 7 can guide and position the rotation of the plug valve stem 2, reduce the radial sway of the valve stem, and ensure its movement accuracy.

[0016] like Figures 1 to 2 As shown, a pressure cap 8 is fixedly installed on the upper end of the plug valve body 1 by bolts. The upper end of the plug valve stem 2 passes through and extends out of the pressure cap 8. Below the pressure cap 8, a sealing packing 9 is installed in the gap between the plug valve body 1 and the plug valve stem 2. The sealing packing 9 is pressed by the pressure cap 8, thereby achieving dynamic sealing of the part where the valve stem passes through and preventing media leakage.

[0017] like Figures 1 to 2As shown, a chamber 22 is formed inside the plug valve stem 2 along its axial direction. An injection valve 10 and a check valve 11 are installed in the chamber 22 from top to bottom. The injection valve 10 is located above the check valve 11. With this design, the operator can inject lubricating or sealing medium into the valve through the injection valve 10 to improve the lubrication between the plug body 4 and the valve seat 120 or enhance the sealing performance. The check valve 11 can effectively prevent the injected medium from flowing back or the pressure medium in the valve from entering the chamber 22 in reverse. A handle 12 is sleeved and fixedly connected to the outer periphery of the plug valve stem 2 near the top. For easy operation, a handle 13 is also connected to the handle 12. By turning the handle 13, the plug valve stem 2 and the plug body 4 can be rotated to realize the opening and closing of the valve.

[0018] To elaborate further, such as Figure 1 As shown, in order to further improve the sealing performance between the lower valve cover 3 and the plug valve body 1, a metal gasket 14 is installed between the lower valve cover 3 and the plug valve body 1. An adjusting bolt 15 is threaded inside the lower valve cover 3. An adjusting cavity 31 is opened in the lower valve cover 3 at the upper end of the adjusting bolt 15. A thrust washer 16 is installed in the adjusting cavity 31. By rotating the adjusting bolt 15, the thrust washer 16 can be pushed upward to tighten the plug body 4, thereby adjusting the contact pressure between the plug body 4 and the valve seat 120, compensating for the gap caused by wear, and ensuring long-term effective sealing.

[0019] To elaborate further, such as Figure 1 As shown, an oil injection nozzle 17 is fixedly installed at the upper end of the plug body 4. The oil injection nozzle 17 is connected to the inside of the plug body 4 and provides another convenient lubrication channel, which can directly inject lubricant into the contact surface between the plug body 4 and the valve seat 120.

[0020] To elaborate further, such as Figure 1 As shown, a limiting protrusion 21 is integrally formed near the lower end of the plug valve stem 2. A sliding washer 18 is installed on the upper end face of the limiting protrusion 21. The sliding washer 18 is located between the limiting protrusion 21 and the corresponding step surface inside the valve stem guide 7 or the plug valve body 1. It can reduce the frictional resistance when the plug valve stem 2 rotates, and play a certain limiting and supporting role for the axial displacement of the valve stem, thus ensuring the flexibility and stability of the valve stem operation.

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0022] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A flanged plug valve, comprising a plug valve body (1), a plug valve stem (2), a lower valve cover (3), and a plug body (4), characterized in that: The lower valve cover (3) is fitted to the lower end of the stopcock valve body (1), and double-headed bolts (5) are fixed through the lower end of the stopcock valve body (1) and the lower valve cover (3). The stopcock valve body (1) has a sealing cavity (110) inside, and the plug (4) is placed in the sealing cavity (110). The stopcock valve body (1) has a valve seat (120) installed inside, and the plug (4) is fitted to the valve seat (120). The upper end of the plug (4) has a groove (41), and an antistatic spring (6) is installed in the groove (41). The lower end of the stopcock valve stem (2) is connected to the antistatic spring (6), and the lower circumference of the stopcock valve stem (2) is... A valve stem guide (7) is sleeved and connected. A pressure cap (8) is fixedly installed on the upper end of the plug valve body (1). The plug valve stem (2) passes through and extends out of the upper end of the pressure cap (8). A sealing packing (9) is installed between the plug valve body (1) and the plug valve stem (2) below the pressure cap (8). A chamber (22) is opened inside the plug valve stem (2), and an injection valve (10) and a check valve (11) are installed in the chamber (22). The injection valve (10) is located above the check valve (11). A handle (12) is sleeved and connected to the outer periphery of the plug valve stem (2) near the top end. A handle (13) is connected to the handle (12).

2. The flanged plug valve according to claim 1, characterized in that: A metal gasket (14) is installed between the lower valve cover (3) and the plug valve body (1). An adjusting bolt (15) is installed inside the lower valve cover (3). An adjusting cavity (31) is opened in the lower valve cover (3) at the upper end of the adjusting bolt (15). A thrust washer (16) is installed in the adjusting cavity (31).

3. A flanged plug valve according to claim 1, characterized in that: An oil injection nozzle (17) is fixedly installed on the upper end of the plug body (4), and the oil injection nozzle (17) is connected to the inside of the plug body (4).

4. A flanged plug valve according to claim 1, characterized in that: The stopcock valve stem (2) has a limiting protrusion (21) near its lower end, and a sliding washer (18) is installed on the upper end of the limiting protrusion (21).

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