High-stability inner sealing structure of stop valve

Abstract

The utility model discloses a high-stability inner sealing structure of a stop valve. The high-stability inner sealing structure is characterized in that a limiting surface and a sealing surface which is connected with a valve rod, limits the moving stroke of the valve rod and has sealing performance are arranged at the bottom of a reverse sealing thread bushing; the sealing surface is arranged on the back sealing thread bushing, when the stop valve is opened, the sealing angle on the valve rod is matched with the sealing surface, the moving stroke of the valve rod is limited, meanwhile, when the sealing angle on the valve rod makes contact with the sealing surface, the back sealing thread bushing can be extruded, the back sealing thread bushing is made to be extruded outwards, and the stop valve is sealed. The sealing performance and the stability of connection between the back sealing thread bushing and the valve body are improved; through the arrangement of the high-strength sealing ring and the high-strength sealing groove, friction between the lower valve element and the interior of the valve body when the stop valve is opened and closed is avoided, the situation that the sealing performance is affected due to abrasion of the lower valve element caused by long-time friction is avoided, the sealing performance and stability of the stop valve are improved, and therefore the service life of the stop valve is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a highly stable internal sealing structure for a gate valve. Background Technology

[0002] Gate valves are commonly used fluid control devices, widely applied in industries such as petroleum, chemical, and power. During their use, sealing performance is a key factor determining their effectiveness. Traditional gate valve sealing structures typically employ a single sealing ring. As the valve stem moves up and down, wear easily occurs between the valve core and body, and wear and aging also easily occur between the valve stem and the sealing ring, leading to decreased sealing performance and even leakage. Therefore, a highly stable internal sealing structure for gate valves is proposed. Utility Model Content

[0003] The main purpose of this utility model is to provide a solution that can effectively address the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-stability internal sealing structure for a gate valve, comprising a valve body, a bracket connected to the valve body by bolts, a valve stem disposed within the valve body and also within the bracket, a spherical lower valve core disposed at one end of the valve stem, an upper valve core connected to the lower valve core, and a reverse sealing threaded sleeve disposed on the valve stem. The reverse sealing threaded sleeve is characterized by having a limiting surface at its bottom and a sealing surface connected to the valve stem, limiting the valve stem's travel and providing sealing performance; a limiting angle adapted to the limiting surface is disposed within the valve body; a sealing angle adapted to the sealing surface is disposed on the valve stem; a high-strength sealing ring is welded to the bottom of the lower valve core; and a high-strength sealing groove adapted to the sealing ring is welded within the valve body.

[0005] Preferably, the inverted sealing threaded sleeve is provided with packing, packing gland and pressure plate from bottom to top, and the pressure plate is fixed to the valve body by screws.

[0006] Preferably, the packing material is provided with sealing gaskets at both the upper and lower ends.

[0007] Preferably, a split ring is provided between the lower valve core and the upper valve core.

[0008] Preferably, a copper wire rod sleeve is installed at the other end of the valve stem; the copper wire rod sleeve is installed on the bracket and connected to needle roller bearings at both ends, and a valve body handwheel is connected to the other end of the copper wire rod sleeve.

[0009] This utility model has the following beneficial effects: By setting the limiting surface and limiting angle, the position of the reverse sealing threaded sleeve in the valve body is limited; by setting a sealing surface on the reverse sealing threaded sleeve, when the gate valve is open, the sealing angle on the valve stem matches the sealing surface, limiting the movement stroke of the valve stem. At the same time, when the sealing angle on the valve stem contacts the sealing surface, it will squeeze the reverse sealing threaded sleeve, causing the reverse sealing threaded sleeve to be squeezed outward, improving the sealing performance and stability of the connection between the reverse sealing threaded sleeve and the valve body; by setting a high-strength sealing ring and a high-strength sealing groove, friction between the lower valve core and the valve body is avoided when the gate valve is opened and closed. Long-term friction will cause wear of the lower valve core, which will affect the sealing performance. This improves the sealing performance and stability of the gate valve, thereby increasing the service life of the gate valve. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a partial enlarged view of A of this utility model;

[0012] Figure 3 This is a partial enlarged view of B of this utility model.

[0013] Legend: 1. Valve body; 101. Limiting angle; 102. High-strength sealing groove; 2. Bracket; 3. Valve stem; 31. Sealing angle; 4. Lower valve core; 41. High-strength sealing ring; 5. Upper valve core; 6. Inverted sealing threaded sleeve; 61. Limiting surface; 62. Sealing surface; 7. Packing; 8. Packing gland; 9. Pressure plate; 10. Sealing gasket; 11. Split ring; 12. Copper wire rod sleeve; 13. Needle roller bearing; 14. Valve body handwheel; 15. Bearing cover. Detailed Implementation

[0014] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0015] like Figure 1-3As shown, a high-stability internal sealing structure for a gate valve includes a valve body 1, a bracket 2 bolted to the valve body 1, a valve stem 3 disposed within the valve body 1 and also within the bracket 2, a spherical lower valve core 4 disposed at one end of the valve stem 3, an upper valve core 5 connected to the lower valve core 4, and a reverse sealing threaded sleeve 6 disposed on the valve stem 3. The reverse sealing threaded sleeve 6 is characterized by having a limiting surface 61 at its bottom and a sealing surface 62 connected to the valve stem 3, limiting the movement of the valve stem 3, and also providing sealing performance. The valve body 1 has a limiting angle 101 adapted to the limiting surface 61. The valve stem 3 has a sealing angle 31 adapted to the sealing surface 62. The lower valve core 4 has a high-strength sealing ring 41 welded to its bottom. The valve body 1 has a high-strength sealing groove 10 adapted to the high-strength sealing ring 41 welded to its interior. 2. By setting the limiting surface 61 and the limiting angle 101, the position of the reverse sealing threaded sleeve 6 within the valve body 1 is limited. By setting the sealing surface 62 on the reverse sealing threaded sleeve 6, when the gate valve is open, the sealing angle 31 on the valve stem 3 matches the sealing surface 62, limiting the travel of the valve stem 3. At the same time, when the sealing angle 31 on the valve stem 3 contacts the sealing surface 62, it will squeeze the reverse sealing threaded sleeve 6, causing the reverse sealing threaded sleeve 6 to be squeezed outward, improving the sealing performance and stability of the connection between the reverse sealing threaded sleeve 6 and the valve body 1. By setting the high-strength sealing ring 41 and the high-strength sealing groove 102, friction between the lower valve core 4 and the valve body 1 is avoided when the gate valve is opened and closed. Long-term friction will cause wear of the lower valve core 4, which will affect the sealing performance. This improves the sealing performance and stability of the gate valve, thereby increasing the service life of the gate valve.

[0016] In one embodiment, the inverted sealing threaded sleeve 6 is provided with packing 7, packing gland 8, and pressure plate 9 from bottom to top, and the pressure plate 9 is fixed to the valve body 1 by screws.

[0017] In one embodiment, sealing gaskets 10 are provided at both the upper and lower ends of the packing 7; a split ring 11 is provided between the lower valve core 4 and the upper valve core 5; the sealing performance of the shut-off valve is increased by the setting of the sealing gaskets 10 and the split ring 11.

[0018] In one embodiment, a copper wire rod sleeve 12 is installed at the other end of the valve stem 3; the copper wire rod sleeve 12 is mounted on the bracket 2 and connected to needle roller bearings 13 at both ends, and the other end of the copper wire rod sleeve 12 is connected to the valve body handwheel 14; a bearing cover 15 for fixing the copper wire rod sleeve 12 is installed on the bracket 2.

[0019] In the process of using this utility model, firstly, the lower valve core 4, the split ring 11, and the upper valve core 5 are installed on one end of the valve stem 3, and the valve stem 3 is installed into the valve body 1. Then, the reverse sealing threaded sleeve 6 is installed into the valve body 1, and the limiting surface 61 on the reverse sealing threaded sleeve 6 is connected to the limiting angle 101 in the valve body 1. Then, the sealing gasket 10 and the seasoning 7 are installed into the valve body 1. Then, the bracket 2 is installed on the valve body 1 with bolts, and the seasoning pressure cap 8 is fixed on the valve body 1 with screws. Then, the pressure plate 9 is fixed on the bracket 2. Then, the needle roller bearing 13 is sleeved on both sides of the copper wire rod sleeve 12 and installed into the groove at the top of the bracket 2. Then, the copper wire rod sleeve 12 is machined and sleeved onto the valve stem 3 and the bracket 2, and the bearing cap 15 is fixed on the bracket 2 with screws. Finally, the valve body handwheel 14 is sleeved onto the copper wire rod sleeve 12 and fixed with nuts.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-stability internal sealing structure for a gate valve, comprising a valve body (1), a bracket (2) bolted to the valve body (1), a valve stem (3) disposed within the valve body (1) and also within the bracket (2), a spherical lower valve core (4) disposed at one end of the valve stem (3), an upper valve core (5) connected to the lower valve core (4), and a reverse sealing threaded sleeve (6) disposed on the valve stem (3), characterized in that: The bottom of the inverted sealing threaded sleeve (6) is provided with a limiting surface (61) and a sealing surface (62) that is connected to the valve stem (3) and limits the movement of the valve stem (3) and also has sealing performance. The valve body (1) is provided with a limiting angle (101) that matches the limiting surface (61). The valve stem (3) is provided with a sealing angle (31) that matches the sealing surface (62). The bottom of the lower valve core (4) is welded with a high-strength sealing ring (41). The valve body (1) is welded with a high-strength sealing groove (102) that matches the sealing ring (41).

2. The high-stability internal sealing structure of a gate valve according to claim 1, characterized in that: The inverted sealing threaded sleeve (6) is provided with packing (7), packing gland (8) and pressure plate (9) from bottom to top. The pressure plate (9) is fixed to the valve body (1) by screws.

3. The high-stability internal sealing structure of a gate valve according to claim 2, characterized in that: The packing material (7) is provided with sealing gaskets (10) at both the upper and lower ends.

4. The high-stability internal sealing structure of a gate valve according to claim 1, characterized in that: A split ring (11) is provided between the lower valve core (4) and the upper valve core (5).

5. The high-stability internal sealing structure of a gate valve according to claim 1, characterized in that: The valve stem (3) is equipped with a copper wire rod sleeve (12) at the other end; the copper wire rod sleeve (12) is mounted on the bracket (2) and connected to needle roller bearings (13) at both ends, and the valve body handwheel (14) is connected to the other end of the copper wire rod sleeve (12).

6. The high-stability internal sealing structure of a gate valve according to claim 1, characterized in that: The bracket (2) is equipped with a bearing cap (15) for fixing the copper wire rod sleeve (12).

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