High-pressure stop valve with valve rod anti-rotation structure

Abstract

The utility model relates to the technical field of stop valves, and discloses a high-pressure stop valve with a valve rod anti-rotation structure, which comprises a valve body, a valve cover is arranged at the top end of the valve body, a sealing gasket is arranged between the valve body and the valve cover, the valve cover is connected with the valve body through four groups of first bolts which are uniformly inserted, and the valve rod anti-rotation structure is arranged between the valve cover and the valve body. The insertion hole is formed in the middle of the valve rod, the cylindrical pin is inserted into the insertion hole in a penetrating mode, the cylindrical pin is inserted into the groove formed in the middle of the pressing plate, rotation of the valve rod is limited, the universality of the valve deck is improved through cooperation of other parts, a special valve deck mold does not need to be independently arranged, and the cost is reduced. The height of the valve cover is reduced to a certain degree, the cost is beneficial, the machining process is also very beneficial, the sharing of the valve cover and the interchangeability of parts can be increased, the cost is saved, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a high-pressure gate valve with a valve stem anti-rotation structure. Background Technology

[0002] A gate valve, also known as a stop valve, is a type of forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to ensure a leak-proof seal. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the frictional force of the valve stem and packing, plus the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the valve stem diameter must be large; otherwise, the valve stem may bend.

[0003] Most existing valve stem anti-rotation gate valves add a guide plate and pin in the middle of the valve cover. However, this structure requires raising the valve to provide installation space for the guide plate and pin, which leads to: ① The original valve cover cannot be used, requiring the production of a new valve cover, increasing valve cover material costs and consequently multiplying mold opening and material management costs; ② The valve cover needs additional guide rail ribs, increasing valve cover costs and reducing processing efficiency (guide rail rib processing is quite cumbersome); ③ This leads to reduced production efficiency. Because the guide plate and pin structure requires drilling, the operation is cumbersome, and the taper pin hole is difficult to machine, requiring specialized tooling. Furthermore, the production process cannot proceed until one part arrives at the factory, resulting in low production efficiency. Additionally, because drilling is required, the guide plate and pin lack interchangeability, requiring more space and increasing space costs.

[0004] In summary, the existing structure of guide plates and pins leads to increased cost per valve cover, doubled mold opening costs, increased material management and site costs, and low production efficiency. Therefore, a new structure is urgently needed to solve these problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a high-pressure shut-off valve with a valve stem anti-rotation structure, which solves the problems that the existing guide plate and pin structure leads to increased cost of a single valve cover, doubled mold opening costs, increased material management and site costs, and low production efficiency.

[0006] This utility model provides the following technical solution: a high-pressure shut-off valve with a valve stem anti-rotation structure, including a valve body, a valve cover provided at the top of the valve body, a sealing gasket provided between the valve body and the valve cover, and the valve cover and the valve body being connected by four sets of first bolts evenly inserted.

[0007] Both ends of the first bolt are fitted with first nuts. A valve stem is provided in the middle of the valve body. A valve disc body is provided at the bottom end of the valve stem. A seat ring is provided between the valve disc body and the valve body. A valve disc cover is provided at the top end of the valve disc body. The valve disc cover is fitted onto the bottom end of the valve stem. A pressure plate is provided at the top of the valve cover. A pressure sleeve is provided between the pressure plate and the valve cover. An upper sealing seat is provided in the middle of the top end of the valve cover. Packing is provided between the top end of the upper sealing seat and the valve cover. The top end of the valve stem passes through the valve cover, the upper sealing seat, the pressure sleeve, and the pressure plate in sequence.

[0008] Preferred technical solution 1: Two hinge bolts are symmetrically inserted at both ends of the pressure plate. The bottom end of the hinge bolt is connected to the valve cover by a pin. The top end of each hinge bolt is fitted with a fixing nut. A valve cylinder is provided at the top end of the pressure plate.

[0009] Preferred technical solution 2: A gearbox is provided at the top of the valve cylinder, and the gearbox is connected to the valve cylinder by an inserted second bolt, with a second nut sleeved at the bottom of the second bolt.

[0010] Preferred technical solution 3: The valve stem has a hole in the middle, and a cylindrical pin is inserted into the hole.

[0011] Preferred technical solution four: The pressure plate has a groove in the middle, and the cylindrical pin is inserted into the groove.

[0012] This solution enables the pressure plate to better limit the rotation of the valve stem.

[0013] Preferred technical solution five: Two through holes are symmetrically opened on both sides of the pressure plate.

[0014] This design allows the hinge bolts to better penetrate the pressure plate for installation.

[0015] Compared with the prior art, this utility model provides a high-pressure shut-off valve with a valve stem anti-rotation structure, which has the following beneficial effects:

[0016] This invention features a centrally located insertion hole in the valve stem, into which a cylindrical pin is inserted. The pin is then inserted into a groove in the center of the pressure plate to restrict the valve stem's rotation. Through the cooperation of other components, the versatility of the valve cover is improved, eliminating the need for a separate valve cover mold and reducing the valve cover height, which is beneficial from a cost perspective. The original structure required drilling conical pin holes for the guide plate and pin, which was extremely complex and difficult to achieve. The new structure only requires machining a through hole at a designated location on the valve stem to accommodate the cylindrical pin, which is also highly beneficial from a manufacturing process perspective. Furthermore, it increases the commonality of valve covers and the interchangeability of parts, saves costs, and improves production efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 2 For the present utility model Figure 1 Schematic diagram of the intermediate pressure plate;

[0019] Figure 3 For the present utility model Figure 1 Top view of the intermediate pressure plate structure.

[0020] In the diagram: 1. Valve body; 2. Valve cover; 3. Sealing gasket; 4. First bolt; 5. First nut; 6. Valve stem; 7. Valve disc body; 8. Seat ring; 9. Valve disc cover; 10. Pressure plate; 11. Pressure sleeve; 12. Upper sealing seat; 13. Packing; 14. Hinge bolt; 15. Pin; 16. Fixing nut; 17. Valve cylinder; 18. Gearbox; 19. Second bolt; 20. Second nut. Detailed Implementation

[0021] Please see Figure 1-3 ,

[0022] Example 1: A high-pressure shut-off valve with a stem anti-rotation structure includes a valve body 1, a valve cover 2 at the top of the valve body 1, a sealing gasket 3 between the valve body 1 and the valve cover 2, and the valve cover 2 and the valve body 1 are connected by four sets of first bolts 4 evenly inserted.

[0023] Both ends of the first bolt 4 are fitted with first nuts 5. A valve stem 6 is provided in the middle of the valve body 1. A valve disc body 7 is provided at the bottom of the valve stem 6. A seat ring 8 is provided between the valve disc body 7 and the valve body 1. A valve disc cover 9 is provided at the top of the valve disc body 7. The valve disc cover 9 is fitted on the bottom of the valve stem 6. A pressure plate 10 is provided at the top of the valve cover 2. A pressure sleeve 11 is provided between the pressure plate 10 and the valve cover 2. An upper sealing seat 12 is provided in the middle of the top of the valve cover 2. A packing 13 is provided between the top of the upper sealing seat 12 and the valve cover 2.

[0024] The top of the valve stem 6 passes through the valve cover 2, the upper sealing seat 12, the pressure sleeve 11, and the pressure plate 10 in sequence. Two hinge bolts 14 are symmetrically inserted at both ends of the pressure plate 10. The bottom end of the hinge bolt 14 is connected to the valve cover 2 by a pin 15. The top of each hinge bolt 14 is fitted with a fixing nut 16. The top of the pressure plate 10 is provided with a valve cylinder 17. The top of the valve cylinder 17 is provided with a gearbox 18. The gearbox 18 is connected to the valve cylinder 17 by a second bolt 19. The bottom end of the second bolt 19 is fitted with a second nut 20.

[0025] Example 2: The difference between this example and Example 1 is that the valve stem 6 has a hole in the middle, and a cylindrical pin is inserted into the hole.

[0026] Example 3: The difference between this example and Example 1 is that the pressure plate 10 has a groove in the middle, and the cylindrical pin is inserted into the groove.

[0027] This allows the pressure plate 10 to better limit the rotation of the valve stem 6.

[0028] Example 4: The difference between this example and Example 1 is that two through holes are symmetrically opened on both sides of the pressure plate 10.

[0029] This allows the hinge bolt 14 to better penetrate the pressure plate 10 for installation.

[0030] In this embodiment, the existing structure of the guide plate and pin leads to increased cost per valve cover, doubled mold opening costs, increased material management and site costs, and low production efficiency.

[0031] In summary, in specific implementation, a valve cover 2 is provided at the top of the valve body 1, and the valve cover 2 is fastened to the valve body 1 by a first bolt 4 and a first nut 5. A valve stem 6 is inserted in the middle of the valve body 1, and the top of the valve stem 6 passes through the top middle of the valve cover 2. A pressure plate 10 is provided at the top of the valve cover 2, and the pressure plate 10 is connected to the valve cover 2 by a pressure sleeve 11.

[0032] The valve stem 6 passes through the middle outer side of the top of the valve cover 2 and is provided with an upper sealing seat 12 and packing 13, which can limit and seal the valve stem 6. The pressure plate 10 has symmetrical grooves on both sides of the middle part and an insertion hole in the middle of the valve stem 6. A cylindrical pin is inserted into the inner side of the insertion hole. The cylindrical pin passes through the valve stem 6 and falls into the groove in the pressure plate 10, thereby restricting the rotation of the valve stem 6 and achieving the purpose of preventing the valve stem 6 from rotating.

[0033] This structure is more suitable for high-pressure structures because the pressure plate of high-pressure structures is thicker, and the stroke of the shut-off valve is relatively small. Therefore, the pressure cap does not need to be thickened. It is only necessary to process a groove on the original basis.

[0034] Through the cooperation of the above components and the limiting of the valve stem 6 by the pressure plate 10, the versatility of the valve cover can be improved, eliminating the need for a separate valve cover mold. The height of the valve cover is also reduced to a certain extent, which is beneficial from a cost perspective. In contrast, the original structure required the guide plate and pin to be drilled with tapered pin holes, which was extremely complex and difficult to achieve in terms of processing. With the new structure, it is only necessary to process a through hole at a designated position on the valve stem to accommodate the cylindrical pin, which is also very beneficial from a processing technology perspective.

Claims

1. A high-pressure globe valve having a valve stem anti-rotation structure, comprising a valve body (1), characterized in that: The valve body (1) is provided with a valve cover (2) at the top, and a sealing gasket (3) is provided between the valve body (1) and the valve cover (2). The valve cover (2) and the valve body (1) are connected by four sets of first bolts (4) that are evenly inserted. The first bolt (4) is fitted with a first nut (5) at both ends. A valve stem (6) is provided in the middle of the valve body (1). A valve disc body (7) is provided at the bottom end of the valve stem (6). A seat ring (8) is provided between the valve disc body (7) and the valve body (1). A valve disc cover (9) is provided at the top end of the valve disc body (7). The valve disc cover (9) is fitted at the bottom end of the valve stem (6). A pressure plate (10) is provided at the top of the valve cover (2). A pressure sleeve (11) is provided between the pressure plate (10) and the valve cover (2). An upper sealing seat (12) is provided in the middle of the top end of the valve cover (2). A packing (13) is provided between the top end of the upper sealing seat (12) and the valve cover (2). The top end of the valve stem (6) passes through the valve cover (2), the upper sealing seat (12), the pressure sleeve (11) and the pressure plate (10) in sequence. Two hinge bolts (14) are symmetrically inserted at both ends of the pressure plate (10). The bottom end of the hinge bolt (14) is connected to the valve cover (2) by a pin (15). The top end of each hinge bolt (14) is fitted with a fixing nut (16). The top end of the pressure plate (10) is provided with a valve cylinder (17). The top end of the valve cylinder (17) is provided with a gearbox (18). The gearbox (18) is connected to the valve cylinder (17) by a second bolt (19). The bottom end of the second bolt (19) is fitted with a second nut (20). The valve stem (6) has a hole in the middle. A cylindrical pin is inserted in the hole. The pressure plate (10) has a groove in the middle. The cylindrical pin is inserted in the groove. Two through holes are symmetrically opened on both sides of the pressure plate (10).

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