Controllable check valve

Abstract

The utility model discloses a controllable check valve, which relates to the technical field of check valves, and comprises a valve body, a valve seat main body, a valve clack, a valve cover, an ejector rod, a cylinder body, a spring and a pressing rod, the valve seat main body is arranged in the valve body, and the valve clack is arranged above the valve seat main body. According to the controllable check valve, auxiliary limiting can be conducted on the valve clack through the fixing sleeve and the fluid balance hole, so that circumferential shaking of the valve clack is eliminated, meanwhile, the fluid impact buffering groove additionally formed in the valve body can reduce noise, and during working, fluid enters an inner cavity of a metal sealing ring of the pressure self-tightening valve seat through the through groove; the hemispherical sealing surface on the pressure self-tightening valve seat metal sealing ring is tightly attached to the surfaces of the valve body and the valve seat main body, so that sealing is achieved, at the moment, the higher the pressure of fluid is, the tighter the hemispherical sealing surface is tightly attached to the surfaces of the valve body and the valve seat main body, and sealing is more reliable. The sealing performance of the check valve can be improved through a pressure self-tightening valve seat metal sealing ring.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a controllable check valve. Background Art

[0002] Oil drilling is an important part of oil exploration and development. Drilling machinery and equipment are used to drill holes on the surface to find oil and natural gas. Check valves are used in the process of oil extraction. The main function of the check valve is to control the flow direction of the liquid in the pipeline, prevent the liquid from flowing back, and ensure that the liquid can flow when needed. The existing check valves still have certain defects when used.

[0003] In the prior art, the check valve plays an important role in ensuring the normal circulation of drilling fluid, preventing bottom hole pressure imbalance and protecting drilling equipment. During the use of the traditional check valve, the pressure of the internal spring is relatively fixed, making the shaking of the valve disc difficult to control, and the sealing between the valve body and the valve seat is poor. Utility Model Content

[0004] The utility model aims to provide a controllable one-flow valve to solve the problem that the internal valve flap of the one-flow valve on the current market is easy to shake, as mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a controllable one-flow valve, comprising: a valve body, a valve seat body, a valve disc, a valve cover, a push rod, a cylinder body, a spring and a pressure rod, the valve seat body is installed inside the valve body, a valve disc is arranged above the valve seat body, a valve cover is connected to the top of the valve body, a push rod is installed inside the valve cover, a cylinder body is installed on the top of the valve cover, a spring is installed inside the cylinder body, a pressure rod is arranged on the top of the spring, a fixing sleeve is installed on the outside of the valve disc, a fluid balancing hole is opened through the fixing sleeve, a fluid impact buffer groove is opened on the inner wall of the valve body near the fluid balancing hole, and a pressure self-tightening valve seat metal sealing ring is arranged between the valve seat body and the valve body.

[0006] Preferably, the outer side and inner wall of the pressure-tightening valve seat metal sealing ring are designed as hemispherical sealing surfaces, and a through groove is formed at the end of the valve body close to the valve seat body.

[0007] Preferably, the pressure self-tightening valve seat metal sealing ring is made of stainless steel, and a sliding structure is formed between the valve flap and the fixed sleeve.

[0008] Preferably, the fixing sleeve is located between the valve body and the valve disc, and the bottom of the fixing sleeve is located on the top surface of the valve seat body.

[0009] Compared with the prior art, the beneficial effects of the utility model are: the controllable one-way valve, the function of the one-way valve is to realize the one-way flow of fluid in the pipeline, but the valve disc is easy to shake during the use of the one-way valve, and the fluid balance hole on the fixed sleeve is interconnected with the fluid impact buffer groove. The valve disc can be auxiliary limited by the fixed sleeve and the fluid balance hole, and the shaking generated by the valve disc can be controlled, thereby eliminating the circumferential shaking of the valve disc. At the same time, the fluid impact buffer groove added inside the valve body can reduce the generation of noise. During operation, the fluid enters the inner cavity of the metal sealing ring of the pressure self-tightening valve seat through the through groove, so that the hemispherical sealing surface on the metal sealing ring of the pressure self-tightening valve seat is tightly fitted with the surface of the valve body and the valve seat body, thereby realizing sealing. At this time, the higher the pressure of the fluid, the tighter the hemispherical sealing surface fits with the surface of the valve body and the valve seat body, and the more reliable the sealing is. The sealing performance of the one-way valve can be improved by the metal sealing ring of the pressure self-tightening valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0011] Figure 2 For this utility model Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0012] Figure 3 This is a schematic diagram of the main structure of the metal sealing ring of the pressure self-tightening valve seat of the utility model;

[0013] Figure 4 For this utility model Figure 3 Schematic diagram of the enlarged structure of B.

[0014] In the figure: 1. valve body; 2. valve seat body; 3. valve disc; 4. valve cover; 5. push rod; 6. cylinder body; 7. spring; 8. pressure rod; 9. fixing sleeve; 10. fluid balance hole; 11. fluid impact buffer groove; 12. pressure self-tightening valve seat metal sealing ring; 13. hemispherical sealing surface; 14. through groove. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1 , Figure 2 , Figure 3 and Figure 4It can be seen that the utility model provides a technical solution: a controllable check valve, comprising: a valve body 1, a valve seat body 2, a valve disc 3, a valve cover 4, a push rod 5, a cylinder body 6, a spring 7 and a pressure rod 8, the valve body 1 is equipped with a valve seat body 2, the valve seat body 2 is provided with a valve disc 3 above the valve seat body 2, the top of the valve body 1 is connected to the valve cover 4, the valve cover 4 is equipped with a push rod 5, the top of the valve cover 4 is equipped with a cylinder body 6, the cylinder body 6 is equipped with a spring 7, the top of the spring 7 is equipped with a pressure rod 8, a fixing sleeve 9 is installed on the outside of the valve disc 3, a fluid balance hole 10 is opened through the fixing sleeve 9, and the valve body 1 is close to the fluid balance A fluid impact buffer groove 11 is provided on the inner wall of the hole 10, and a pressure self-tightening valve seat metal sealing ring 12 is arranged between the valve seat body 2 and the valve body 1. The outer side and the inner wall of the pressure self-tightening valve seat metal sealing ring 12 are designed as a hemispherical sealing surface 13. A through groove 14 is provided at the end of the valve body 1 close to the valve seat body 2. The pressure self-tightening valve seat metal sealing ring 12 is made of stainless steel. A sliding structure is formed between the valve disc 3 and the fixed sleeve 9. The fixed sleeve 9 is located between the valve body 1 and the valve disc 3. The bottom of the fixed sleeve 9 is located on the top surface of the valve seat body 2. The pressure self-tightening valve seat metal sealing ring 12 and the hemispherical sealing surface 13 are an integrally formed structure.

[0017] In specific implementation, the function of the one-way valve is to realize one-way flow of fluid in the pipeline, prevent backflow and mixed flow, and ensure the normal operation of the pipeline and equipment. However, during the use of the one-way valve, the valve disc 3 is easy to shake, and the sealing between the valve body 1 and the valve seat body 2 is poor. For this reason, a fixed sleeve 9 can be installed inside the valve body 1, and the fluid balance hole 10 on the fixed sleeve 9 is interconnected with the fluid impact buffer groove 11. The valve disc 3 can be auxiliary limited by the fixed sleeve 9 and the fluid balance hole 10, and the shaking of the valve disc 3 can be controlled, thereby eliminating the circumferential shaking of the valve disc 3, so that the one-way valve is used in the process of use. During the operation, the valve disc 3 is not easy to shake. At the same time, the fluid impact buffer groove 11 added inside the valve body 1 can reduce the generation of noise. The pressure self-tightening valve seat metal sealing ring 12 between the valve body 1 and the valve seat body 2 is in an interference state during installation. During operation, the fluid enters the inner cavity of the pressure self-tightening valve seat metal sealing ring 12 through the through groove 14, so that the hemispherical sealing surface 13 on the pressure self-tightening valve seat metal sealing ring 12 fits tightly with the surface of the valve body 1 and the valve seat body 2, thereby achieving sealing. At this time, the higher the pressure of the fluid, the tighter the hemispherical sealing surface 13 fits tightly with the surface of the valve body 1 and the valve seat body 2, and the more reliable the seal.

[0018] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 It can be seen that the sealing performance of the check valve can be improved by using the pressure-tightening valve seat metal sealing ring 12 .

[0019] To sum up, when using the controllable one-way valve, when the fluid enters the valve body 1, the fluid pressure will lift the valve disc 3, so that the fluid can pass through the valve body 1 smoothly. When the fluid tries to flow in the opposite direction, the valve disc 3 will be tightly closed on the valve seat body 2 by the action of the fluid pressure and its own gravity, thereby effectively preventing the backflow of the fluid. The one-way valve is a prior art and will not be described in detail here. When working, the fluid enters the inner cavity of the pressure self-tightening valve seat metal sealing ring 12 through the through groove 14, so that the hemispherical sealing surface 13 on the pressure self-tightening valve seat metal sealing ring 12 is tightly fitted with the surface of the valve body 1 and the valve seat body 2, thereby achieving sealing. At this time, the higher the pressure of the fluid, the tighter the hemispherical sealing surface 13 is tightly fitted with the surface of the valve body 1 and the valve seat body 2, and the more reliable the seal is. The sealing performance of the one-way valve can be improved by the pressure self-tightening valve seat metal sealing ring 12. The content not described in detail in this description belongs to the prior art known to professional and technical personnel in this field.

[0020] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A controllable check valve, comprising: A valve body (1), a valve seat body (2), a valve disc (3), a valve cover (4), a push rod (5), a cylinder body (6), a spring (7) and a pressure rod (8), characterized in that: A valve seat body (2) is installed inside the valve body (1), a valve flap (3) is arranged above the valve seat body (2), a valve cover (4) is connected to the top of the valve body (1), a push rod (5) is installed inside the valve cover (4), a cylinder body (6) is installed on the top of the valve cover (4), a spring (7) is installed inside the cylinder body (6), and a pressure rod (8) is arranged on the top of the spring (7); A fixed sleeve (9) is installed on the outer side of the valve disc (3); a fluid balance hole (10) is provided inside the fixed sleeve (9); a fluid impact buffer groove (11) is provided on the inner wall of the valve body (1) near the fluid balance hole (10); and a pressure-tightening valve seat metal sealing ring (12) is provided between the valve seat body (2) and the valve body (1).

2. A controllable check valve according to claim 1, characterized in that: The outer side and inner wall of the pressure-tightening valve seat metal sealing ring (12) are designed as hemispherical sealing surfaces (13), and a through groove (14) is provided at the end of the valve body (1) close to the valve seat body (2).

3. A controllable check valve according to claim 2, characterized in that: The material of the pressure self-tightening valve seat metal sealing ring (12) is stainless steel, and a sliding structure is formed between the valve flap (3) and the fixing sleeve (9).

4. A controllable check valve according to claim 3, characterized in that: The fixing sleeve (9) is located between the valve body (1) and the valve disc (3), and the bottom of the fixing sleeve (9) is located on the top surface of the valve seat body (2).

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