Pressure bearing and anti-loosening device of high-pressure regulating valve

Abstract

The application belongs to the field of high-pressure regulating valve, and discloses a pressure-bearing and anti-loosening device of high-pressure regulating valve. The pressure nut and the valve body are engaged through threads, and the engagement force generated between the threads can balance the outward pressure generated by the impact of high-pressure medium. The application only needs to place the valve rod and the pressure nut in the valve body to limit the gap between the upper valve plate and the lower valve plate. The original processing of several bolt holes is changed into the processing of only one threaded hole, so that the structure is simple, the processing difficulty of the valve body is reduced, the processing efficiency is improved, the original assembly of several bolts is changed into the assembly of only one pressure nut, the assembly difficulty of the valve is reduced, the assembly efficiency is improved, the conventional valve cover is removed, and the profit rate of the product is improved. The application has reasonable structure, is easy to produce, process and assemble, and can fully exert the advantages of the high-pressure regulating valve.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure regulating valves, and specifically relates to a pressure-bearing and anti-loosening device for a high-pressure regulating valve. Background Technology

[0002] In oil extraction, especially in the later stages, high-pressure water injection systems are used to inject water underground to obtain crude oil. The high-pressure regulating valve is a crucial component of these systems; its operation controls the on / off state and flow rate of the underground water injection.

[0003] In existing technology, several bolt holes are first drilled on the upper surface of the valve body, and several bolt through holes are drilled on the valve cover. The valve body and valve cover are then connected using bolts. Secondly, when pressure is generated inside the valve body, it exerts an outward thrust on the valve cover, causing it to shift from the high-pressure side to the low-pressure side. The tightening force generated by the bolts installed on the valve cover counteracts this thrust, thus maintaining the stability of the high-pressure regulating valve. Under high-pressure conditions, a relatively large number of bolts are generally required. The method of using bolts to compress the valve cover to bear pressure has the following drawbacks:

[0004] 1) The valve body and valve cover are machined with multiple through holes and bolt holes, which requires high processing technology and processing level, and is also time-consuming and labor-intensive.

[0005] (2) When assembling multiple bolts, the assembly process and assembly proficiency are required. The order of bolt assembly and the magnitude of preload must be considered, making the assembly time-consuming and labor-intensive.

[0006] (3) The pressure inside the valve body is unstable and fluctuates, which makes the bolts easy to loosen and there is a risk of leakage of the medium. Summary of the Invention

[0007] The purpose of this invention is to overcome the time-consuming and labor-intensive processing and assembly of high-pressure regulating valves, as well as the problem of loose bolts, and to provide a pressure-bearing and anti-loosening device for high-pressure regulating valves.

[0008] To achieve the above objectives, the present invention includes:

[0009] The valve body is equipped with an inlet pipe and an outlet pipe, and the inner surface of the valve body is provided with internal threads.

[0010] The valve stem has a stepped structure at the bottom, and a clamping nut is fitted on the upper part of the stepped structure. The clamping nut has an external thread that meshes with the internal thread of the valve body. The clamping nut is placed inside the valve body, and the lower part of the stepped structure is placed inside the valve body. An upper valve plate is connected to the bottom of the valve stem, and a lower valve plate is connected to the bottom of the upper valve plate. A water passage hole is opened on the lower valve plate.

[0011] The valve body is provided with a threaded through hole, and a set screw is installed in the threaded through hole, which can contact the clamping nut.

[0012] A bushing is provided between the clamping nut and the stepped structure of the valve stem.

[0013] The valve body has a stepped surface, and the lower valve plate is placed on the stepped surface.

[0014] The water passage holes of the upper and lower valve plates are connected through the gap between the upper and lower valve plates.

[0015] The inlet pipe guides the medium between the valve stem and the upper valve plate.

[0016] The outer diameter of the stepped structure at the bottom of the valve stem is the same as the outer diameter of the clamping nut.

[0017] The upper valve plate is fixed to the bottom surface of the valve stem by bolts.

[0018] The lower valve plate is fixed to the inner wall of the valve body.

[0019] A sealing ring is provided between the clamping nut and the valve body.

[0020] Compared with existing technologies, the clamping nut of this invention engages with the valve body via threads. The interlocking force generated by these threads balances the outward pressure caused by the impact of high-pressure media. This invention only requires placing the valve stem and clamping nut within the valve body to limit the gap between the upper and lower valve plates. The number of bolt holes required is reduced to a single threaded hole, simplifying the structure, reducing the difficulty of valve body manufacturing, and improving manufacturing efficiency. Furthermore, the assembly of valves is reduced from requiring several bolts to just one clamping nut, simplifying valve assembly, improving assembly efficiency, and eliminating the need for a conventional valve cover, thus increasing product profit margins. The structure of this invention is reasonable, easy to manufacture and assemble, and fully leverages the advantages of high-pressure regulating valves.

[0021] Furthermore, the present invention is equipped with a set screw, which can prevent the clamping nut from loosening and increase the safety of the product under high pressure conditions. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the present invention;

[0023] The components are: 1. Inlet pipe; 2. Valve body; 3. Set screw; 4. Compression nut; 5. Valve stem; 6. Bushing; 7. Upper valve plate; 8. Lower valve plate; 9. Outlet pipe. Detailed Implementation

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] See Figure 1This invention includes a valve body 2 and a valve stem 5. The valve body 2 is provided with an inlet pipe 1 and an outlet pipe 9. The inner surface of the valve body 2 has an internal thread. The bottom of the valve stem 5 has a stepped structure, with a clamping nut 4 fitted onto the upper part of the stepped structure. The clamping nut 4 has an external thread that engages with the internal thread of the valve body 2. The clamping nut 4 is placed inside the valve body 2. The lower part of the stepped structure is also placed inside the valve body 2. An upper valve plate 7 is connected to the bottom of the valve stem 5, and a lower valve plate 8 is connected to the bottom of the upper valve plate 7. The lower valve plate 8 has a water passage hole. The valve body 2 has a threaded through hole, and a set screw 3 is installed in the threaded through hole, which can contact the clamping nut 4. A bushing 6 is provided between the clamping nut 4 and the stepped structure of the valve stem 5. The valve body 2 has a stepped surface, and the lower valve plate 8 is placed on the stepped surface. The water passage holes of the upper valve plate 7 and the lower valve plate 8 are connected through the gap between the upper valve plate 7 and the lower valve plate 8. The inlet pipe 1 guides the medium between the valve stem 5 and the upper valve plate 7. The outer diameter of the stepped structure at the bottom of the valve stem 5 is the same as the outer diameter of the clamping nut 4. The upper valve plate 7 is fixed to the bottom surface of the valve stem 5 by bolts. The lower valve plate 8 is fixed to the inner wall of the valve body 2. A sealing ring is provided between the clamping nut 4 and the valve body 2.

[0026] High-pressure medium enters the cavity of valve body 2 through inlet pipe 1, forming high pressure in the cavity of valve body 2. The pressure generated by the high pressure will cause the clamping nut 4, valve stem 5 and bushing 6 to tend to move towards the low-pressure side. Since the valve body 2 and clamping nut 4 are connected by threads, the biting force generated between the threads will balance this outward pressure, so that clamping nut 4, valve stem 5 and bushing 6 avoid this tendency to move.

[0027] If the pressure inside the valve body 2 cavity fluctuates, the threads engaging between the valve body 2 and the clamping nut 4 may loosen. However, the set screw 3 on the valve body 2 will tightly hold the clamping nut 4 in place, preventing it from loosening. The high-pressure medium flows through the gap between the upper valve plate 7 and the lower valve plate 8, finally passing through the water passage hole on the lower valve plate 8 to the bottom of the cavity, and finally flowing out from the outlet pipe 9.

[0028] The present invention controls the flow rate of high-pressure medium by adjusting the gap between the upper valve plate 7 and the lower valve plate 8 by rotating the clamping nut 4.

Claims

1. A pressure-bearing and anti-loosening device for a high-pressure regulating valve, characterized in that, include: The valve body (2) is provided with an inlet pipe (1) and an outlet pipe (9). The inner surface of the valve body (2) is provided with an internal thread. The valve stem (5) has a stepped structure at the bottom. A clamping nut (4) is fitted on the upper part of the stepped structure. An external thread is provided on the clamping nut (4). The external thread of the clamping nut (4) meshes with the internal thread of the valve body (2). The clamping nut (4) is placed inside the valve body (2). The lower part of the stepped structure is placed inside the valve body (2). An upper valve plate (7) is connected to the bottom of the valve stem (5). A lower valve plate (8) is connected to the bottom of the upper valve plate (7). A water passage hole is provided on the lower valve plate (8). A bushing (6) is provided between the stepped structure of the clamping nut (4) and the valve stem (5); The valve body (2) has a stepped surface inside, and the lower valve plate (8) is placed on the stepped surface; The water passage holes of the upper valve plate (7) and the lower valve plate (8) are connected through the gap between the upper valve plate (7) and the lower valve plate (8); The inlet pipe (1) guides the medium between the valve stem (5) and the upper valve plate (7); The flow rate of the high-pressure medium can be controlled by adjusting the gap between the upper valve plate (7) and the lower valve plate (8) by rotating the clamping nut (4).

2. The pressure-bearing and anti-loosening device for a high-pressure regulating valve according to claim 1, characterized in that, The valve body (2) is provided with a threaded through hole, and a set screw (3) is provided in the threaded through hole. The set screw (3) can contact the clamping nut (4).

3. The pressure-bearing and anti-loosening device for a high-pressure regulating valve according to claim 1, characterized in that, The outer diameter of the bottom stepped structure of the valve stem (5) is the same as the outer diameter of the clamping nut (4).

4. The pressure-bearing and anti-loosening device for a high-pressure regulating valve according to claim 1, characterized in that, The upper valve plate (7) is fixed to the bottom surface of the valve stem (5) by bolts.

5. The pressure-bearing and anti-loosening device for a high-pressure regulating valve according to claim 1, characterized in that, The lower valve plate (8) is fixed on the inner wall of the valve body (2).

6. The pressure-bearing and anti-loosening device for a high-pressure regulating valve according to claim 1, characterized in that, A sealing ring is provided between the clamping nut (4) and the valve body (2).

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