Anti-biting rod structure of valve

Abstract

An anti-biting rod structure of a valve comprises a valve body, a valve cover, a valve rod, filler and a sealing assembly, the valve body is arranged at one end of the valve cover, the sealing assembly is arranged at the other end of the valve cover, the filler is arranged between the sealing assembly and the valve cover, and one end of the valve rod sequentially penetrates through the sealing assembly, the valve cover, the filler and the valve body and is arranged in an inner cavity of the valve body; the sealing assembly comprises a pressing plate, an adapter sleeve and a pressing sleeve, and the adapter sleeve is arranged between the pressing plate and the pressing sleeve; the pressing plate is fixedly connected with the valve cover through a connecting rod; according to the technical scheme, the guide table is arranged at one end of the adapter sleeve, the fastening table is arranged at the other end of the adapter sleeve, and the fastening table is the conical ring, so that the guide table is arranged at one end of the adapter sleeve, the fastening table is arranged at the other end of the adapter sleeve, the mounting table is arranged between the guide table and the fastening table, and the fastening table is the conical ring; the adapter sleeve can correct the installation position of the pressing sleeve through the fastening table, and the phenomenon that the pressing sleeve bites a rod, and consequently the packing sealing effect of the stop valve is weakened, and leakage occurs is avoided.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve anti-biting rod structure. Background Technology

[0002] Valves are control components in fluid transport systems, pipeline accessories with functions such as shut-off, regulation, flow diversion, backflow prevention, pressure stabilization, flow splitting, or overflow pressure relief. Based on their function, they can be classified as shut-off valves, check valves, and regulating valves. Shut-off valves, also known as gate valves, are forced-seal valves. Therefore, when the valve is closed, pressure must be applied to the valve disc to force a leak-proof seal. However, the packing is located between the valve stem and the valve cover. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome, the friction between the valve stem and the packing, and the thrust generated by the pressure of the medium can all cause the packing to deviate to one side when the required resistance is large. Furthermore, an excessively small chamfer angle can cause the packing to bite into the valve stem. This biting increases the torque, but it is not obvious and difficult to detect manually. Biting into the valve stem leads to a decrease in the sealing effect of the packing and even leakage. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a valve anti-biting rod structure.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A valve anti-bite stem structure includes a valve body, a valve cover, a valve stem, packing, and a sealing assembly. The valve body is disposed at one end of the valve cover, the sealing assembly is disposed at the other end of the valve cover, and the packing is disposed between the sealing assembly and the valve cover. One end of the valve stem passes through the sealing assembly, the valve cover, the packing, and the valve body in sequence and is disposed within the inner cavity of the valve body. The sealing assembly includes a pressure plate, a locking sleeve, and a pressure sleeve, with the locking sleeve disposed between the pressure plate and the pressure sleeve. The pressure plate and the valve cover are connected and fixed by a connecting rod.

[0006] Preferably, one end of the pressure plate is provided with a limiting groove, and the edge of the limiting groove has a first chamfer structure.

[0007] Preferably, one end of the pressure sleeve is provided with a limiting boss, which is adapted to the limiting groove.

[0008] Preferably, one end of the inner cavity of the limiting boss is provided with a second chamfer structure.

[0009] Preferably, one end of the locking sleeve is provided with a guide platform, and the other end is provided with a fastening platform. An installation platform is provided between the guide platform and the fastening platform, and the fastening platform is a conical ring.

[0010] Preferably, the inner cavity of the fastening platform is adapted to the inner cavity of the limiting boss.

[0011] Preferably, the outer diameter of the mounting platform is larger than the inner diameter of the limiting boss.

[0012] Preferably, the inner cavity of the limiting boss gradually narrows from the outside to the inside.

[0013] By adopting the above technical solution, since one end of the locking sleeve is provided with a guide platform and the other end with a fastening platform, and an installation platform is provided between the guide platform and the fastening platform, and the fastening platform is a conical ring, the locking sleeve can be aligned with the installation position of the pressure sleeve by the fastening platform, avoiding the pressure sleeve biting phenomenon, which would weaken the packing sealing effect of the gate valve and cause leakage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is the front view of the present invention;

[0016] Figure 3 This is a cross-sectional view of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of the pressure plate of this utility model;

[0018] Figure 5 This is a cross-sectional view of the pressure plate of this utility model;

[0019] Figure 6 This is the front view of the fastening sleeve of this utility model;

[0020] Figure 7 This is a cross-sectional view of the fastening sleeve of this utility model;

[0021] Figure 8 This is a front view of the pressure sleeve of this utility model;

[0022] Figure 9 This is a cross-sectional view of the pressure sleeve of this utility model.

[0023] In the diagram, 1-valve body, 2-valve cover, 3-valve stem, 4-packing, 5-sealing assembly, 6-connecting rod, 501-pressure plate, 502-locking sleeve, 503-pressure sleeve, 504-limiting groove, 505-first chamfer structure, 506-limiting boss, 507-second chamfer structure, 508-guide platform, 509-fastening platform, 510-mounting platform. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted again that the description of these embodiments is intended to aid in understanding the technical features involved in the various embodiments of this utility model, and these features can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1-9 As shown, a valve anti-biting stem structure includes a valve body 1, a valve cover 2, a valve stem 3, packing 4, and a sealing assembly 5. The valve body 1 is disposed at one end of the valve cover 2, the sealing assembly 5 is disposed at the other end of the valve cover 2, and the packing 4 is disposed between the sealing assembly 5 and the valve cover 2. One end of the valve stem 3 passes through the sealing assembly 5, the valve cover 2, the packing 4, and the valve body 1 in sequence and is disposed in the inner cavity of the valve body 1. The sealing assembly 5 includes a pressure plate 501, a locking sleeve 502, and a pressure sleeve 503. The locking sleeve 502 is disposed between the pressure plate 501 and the pressure sleeve 503. The pressure plate 501 and the valve cover 2 are connected and fixed by a connecting rod 6, so that the locking sleeve 502 can be aligned with the installation position of the pressure sleeve 503 by the fastening table 509, avoiding the phenomenon of the pressure sleeve 503 biting the stem, which would weaken the sealing effect of the packing 4 of the gate valve and cause leakage.

[0026] Additionally, one end of the pressure plate 501 is provided with a limiting groove 504, the edge of which has a first chamfer structure 505, to improve assembly efficiency and at the same time serve as an assembly guide to ensure proper installation.

[0027] Furthermore, one end of the pressure sleeve 503 is provided with a limiting boss 506, which is adapted to the limiting groove 504.

[0028] Additionally, a second chamfer structure 507 is provided at one end of the inner cavity of the limiting boss 506.

[0029] Furthermore, one end of the locking sleeve 502 is provided with a guide platform 508, and the other end is provided with a fastening platform 509. An installation platform 510 is provided between the guide platform 508 and the fastening platform 509. The fastening platform 509 is a conical ring, so that when the pressure sleeve 503 and the locking sleeve 502 are installed together, the installation position can be corrected and adjusted to prevent the valve stem 3 from biting.

[0030] In addition, the inner cavity of the fastening platform 509 is compatible with that of the limiting boss 506.

[0031] Furthermore, the outer diameter of the mounting platform 510 is larger than the inner diameter of the limiting boss 506. The pressure plate 501 applies force to the locking sleeve 502 to correct and adjust the position of the pressure sleeve 503, preventing the valve stem 3 from biting, which would weaken the sealing effect of the shut-off valve or even cause leakage.

[0032] In addition, the inner cavity of the limiting boss 506 gradually narrows from the outside to the inside, which enables the pressure sleeve 503 to be guided and positioned smoothly and accurately, and avoids the pressure sleeve 503 from deviating to the side and causing the valve stem 3 to bite.

[0033] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations will still fall within the new protection scope of this utility model.

Claims

1. A valve anti-biting stem structure, characterized in that: The valve includes a valve body, a valve cover, a valve stem, packing, and a sealing assembly. The valve body is located at one end of the valve cover, the sealing assembly is located at the other end of the valve cover, and the packing is located between the sealing assembly and the valve cover. One end of the valve stem passes through the sealing assembly, the valve cover, the packing, and the valve body in sequence and is located within the inner cavity of the valve body. The sealing assembly includes a pressure plate, a locking sleeve, and a pressure sleeve, with the locking sleeve located between the pressure plate and the pressure sleeve. The pressure plate and the valve cover are connected and fixed by a connecting rod.

2. The valve anti-biting stem structure according to claim 1, characterized in that: One end of the pressure plate is provided with a limiting groove, and the edge of the limiting groove has a first chamfer structure.

3. The valve anti-biting stem structure according to claim 1, characterized in that: One end of the pressure sleeve is provided with a limiting boss, which is adapted to the limiting groove.

4. The valve anti-biting stem structure according to claim 3, characterized in that: One end of the inner cavity of the limiting boss is provided with a second chamfer structure.

5. The valve anti-biting stem structure according to claim 1, characterized in that: One end of the locking sleeve is provided with a guide platform, and the other end is provided with a fastening platform. An installation platform is provided between the guide platform and the fastening platform. The fastening platform is a conical ring.

6. The valve anti-biting stem structure according to claim 5, characterized in that: The inner cavity of the fastening platform is adapted to the inner cavity of the limiting boss.

7. The valve anti-biting stem structure according to claim 5, characterized in that: The outer diameter of the mounting platform is larger than the inner diameter of the limiting boss.

8. The valve anti-biting stem structure according to claim 4, characterized in that: The inner cavity of the limiting boss gradually narrows from the outside to the inside.

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