Safety pressure relief device of grease injection check valve

Abstract

The utility model discloses a safety pressure relief device of a grease injection check valve, which comprises a stop valve, a pipe joint, a propelling assembly and a body, and the pipe joint connected with a pressure relief pipeline is connected with the side surface of the body through the stop valve; the lower end of the body is rotationally connected with a movable nut through a connector body and connected with a grease injection check valve through the movable nut. The propelling assembly penetrates through the body, the connector body and the movable nut and is used for ejecting a grease injection check valve steel ball of the grease injection check valve open, so that fluid in the grease injection check valve is subjected to pressure relief through the pressure relief device. The device can be connected with a well head device and a grease injection check valve of a gate valve, and the connection direction can be adjusted at will through movable nut connection; leaked fluid can be safely and effectively collected through control of the stop valve, and the grease injection check valve and the gate valve can be subjected to oil injection cleaning, lubricating, repairing and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of maintenance and repair of wellhead devices and gate valves in the oil and gas industry, in particular to a safety pressure relief device for a grease-injected check valve. Background Art

[0002] During on-site maintenance and repair of wellhead devices and gate valves, it is often necessary to disassemble the grease injection check valve. At this time, if the wellhead device and the gate valve cavity are under pressure, there is a certain risk in disassembling the grease injection check valve under pressure. Therefore, a safe and reliable pressure relief device is required.

[0003] Current pressure relief devices on the market cannot be controlled after the grease injection check valve fails, which still poses certain risks. Furthermore, because the main body of these pressure relief devices is directly threaded onto the grease injection check valve, the fixed direction of the pressure relief port makes it difficult to connect to the pressure relief pipeline, resulting in poor pressure relief effectiveness. Furthermore, the threaded connection direction is not adjustable. Utility Model Content

[0004] The purpose of the utility model is to provide a safety pressure relief device for a grease injection check valve, which is used to solve the technical problems in the prior art that the connection direction between the pressure relief device and the grease injection check valve cannot be adjusted, and the pressure relief device cannot be controlled after the grease injection check valve fails.

[0005] The utility model solves the above problems through the following technical solutions:

[0006] A safety pressure relief device for a grease injection check valve comprises: a stop valve, a pipe joint, a propulsion assembly and a body, wherein the pipe joint connected to a pressure relief pipeline is connected to the side of the body through the stop valve; the lower end of the body is rotatably connected to a live nut through a joint body, and is connected to the grease injection check valve through the live nut; the propulsion assembly is arranged through the body, the joint body and the live nut, and is used to push open the grease injection check valve steel ball of the grease injection check valve, so that the fluid in the grease injection check valve is relieved through the pressure relief device.

[0007] As a further improvement, the propulsion assembly includes: a connected propulsion screw and a push rod, the lower end of the propulsion screw is arranged in the through hole of the main body and is sealed with the main body thread, and the lower end of the push rod passes through the main body, the joint body and the live nut in sequence, so that the push rod is driven to move downward by rotating the propulsion screw, thereby causing the push rod to push open the grease injection one-flow valve steel ball of the grease injection one-flow valve.

[0008] As a further improvement, the body is threadedly connected to the propulsion screw so that the propulsion screw can be moved up and down in the body by rotating the propulsion screw.

[0009] As a further improvement, a sealing structure is provided at the upper end of the body to achieve sealed installation between the upper end of the body and the advancing screw through the sealing structure.

[0010] As a further improvement, the sealing structure includes: a pressure cap, a pressure ring and a sealing packing sleeved outside the advancing screw, and the pressure ring presses the sealing packing by tightening the pressure cap connected to the external thread of the upper end of the body.

[0011] As a further improvement, the propulsion assembly further includes a handle connected to the propulsion screw.

[0012] As a further improvement, the joint body is threadedly connected to the main body.

[0013] As a further improvement, the movable nut is threadedly connected to the grease injection check valve.

[0014] As a further improvement, copper pads and sealing pads are respectively provided at the upper and lower ends of the joint body.

[0015] As a further improvement, a pressure relief port is provided on the side of the main body, one end of the stop valve is connected to the pressure relief port, and the other end is connected to a pipe joint via a conversion joint.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] The pressure relief device of the utility model can be connected with the grease injection check valve of the wellhead device and the gate valve; the live nut connection can adjust the connection direction at will; the leaked fluid can be safely and effectively collected through the control of the stop valve, and the grease injection check valve and the gate valve can also be cleaned, lubricated and repaired with oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a safety pressure relief device for a grease injection check valve according to the present invention.

[0019] Reference numerals:

[0020] 1. Handle; 2. Push screw; 3. Pressing cap; 4. Pressing ring; 5. Sealing packing; 6. Washer; 7. Main body; 8. Copper washer; 9. Connector body; 10. Live nut; 11. Sealing gasket; 12. Push rod; 13. Stop valve; 14. Adapter; 15. Pipe joint; 16. Threaded interface of grease injection check valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example

[0023] Combined with attachment Figure 1 As shown, a safety pressure relief device for a grease injection check valve comprises: a stop valve 13, a pipe joint 15, a propulsion assembly and a body. The pipe joint 15 connected to the pressure relief line is connected to the side of the body 7 through the stop valve 13; the lower end of the body is rotatably connected to a live nut through a joint body 9, and is connected to the grease injection check valve through the live nut; the propulsion assembly is arranged through the body, the joint body 9 and the live nut, and is used to push open the grease injection check valve steel ball of the grease injection check valve, so that the fluid in the grease injection check valve is relieved through the pressure relief device.

[0024] In a specific embodiment, a safety pressure relief device for a grease injection check valve includes: a stop valve 13, a pipe joint 15, a propulsion assembly, and a body 7, a joint body 9 and a live nut 10 connected in sequence. The propulsion assembly has a connected propulsion screw 2 and a push rod 12. The lower end of the propulsion screw 2 is arranged in a through hole of the body and is threadedly sealed with the body 7. The lower end of the push rod 12 is arranged through the body 7, the joint body 9 and the live nut 10 in sequence, so that the push screw 2 drives the push rod 12 to move downward, thereby causing the push rod 12 to move downward. 2 pushes open the grease injection check valve steel ball, so that the fluid in the grease injection check valve flows into the pressure relief chamber between the main body and the push rod 12 through the joint body 9; the side of the main body 7 is connected to the pipe joint 15 through the stop valve 13, and the pipe joint 15 is connected to the pressure relief pipeline to drain the fluid in the pressure relief chamber through the pressure relief pipeline to achieve safe and controllable pressure relief; and the grease injection check valve is threadedly connected through the live nut 10, and the direction of the stop valve 13 and one end of the pipe joint 15, that is, the direction of the pressure relief port, can be adjusted to ensure the connection with the pressure relief pipeline.

[0025] Furthermore, an internal thread is provided in the middle of the through hole of the body 7, and an external thread is provided in the middle of the advancement screw 2 to cooperate with the internal thread of the through hole, so as to realize a threaded connection. Preferably, a handle 1 is fixed to the upper end of the advancement screw 2 by a nut, so that the advancement screw 2 can be moved up and down relative to the body 7 within the body by rotating the handle.

[0026] The upper end of the body 7 is provided with a sealing structure including a pressure cap 3, a pressure ring 4, and a sealing packing 5. This sealing structure allows for a sealed installation between the upper end of the body 7 and the advancing screw 2. Specifically, the outer wall of the upper end of the body 7 is provided with an external thread that is threadedly connected to the pressure cap 3. The pressure ring 4 and the sealing packing 5 are sleeved around the outside of the advancing screw 2. Tightening the pressure cap 3 allows the pressure ring 4 to compress the sealing packing 5. Optionally, a gasket 6 is further provided at the lower portion of the sealing packing 5. The gasket 6 is also sleeved around the outside of the advancing screw 2. The gasket 6 and the pressure ring 4 are used to limit the upward and downward installation of the sealing packing 5.

[0027] The upper and lower ends of the connector body 9 are respectively provided with external threads connected to the main body 7 and the movable nut 10. The main body 7 is provided with a copper washer 8 in contact with the upper end surface of the connector body 9, and the copper washer 8 is sleeved on the outside of the push rod 12. The movable nut 10 is limited at the lower end of the connector body 9, and a grease injection check valve threaded interface portion 16 is formed in the movable nut 10 and is threadedly connected to the grease injection check valve. Preferably, in order to enhance the sealing performance, a sealing gasket 11 is also limited in the grease injection check valve threaded interface portion 16, and the sealing gasket 11 is sleeved on the outside of the push rod 12. The sealing gasket 11 can be limited by a step, and of course, the sealing gasket can also be limited by a diameter change, which is not limited by this application.

[0028] In an optional embodiment, a pressure relief port is provided at one end of the side of the main body 7, and an internal thread is formed in the connecting block that is threadedly connected to the stop valve 13. The pressure relief port can be opened and closed, and the flow rate can be controlled by the stop valve. A conversion joint 14 is threadedly connected to the end of the stop valve 13 away from the pressure relief port, and a pipe joint 15 is connected to the other end of the conversion joint 14. The end of the stop valve 13 away from the pressure relief port and the pipe joint 15 are connected through the conversion joint 14, so that the pipe joint 15 with a smaller end is connected to the stop valve 13. Preferably, in this embodiment, the stop valve 13 is a Y-type stop valve. The structure of the Y-type stop valve is a conventional structure, so it will not be described in detail. The Y-type stop valve can completely block the fluid flowing out of the pressure relief port or control the flow rate.

[0029] The working principle of the present utility model is as follows: when using the pressure relief device, the grease injection check valve is connected through the threaded interface portion 16 of the grease injection check valve formed in the live nut 10, and one end of the pressure relief port of the pressure relief device is rotated to connect the pipe joint 15 to the pressure relief pipeline, and the minimum pipeline connection can be guaranteed; the handle 1 is rotated to make the push rod 12 push open the grease injection check valve steel ball of the grease injection check valve, and the fluid in the valve cavity of the grease injection check valve flows to the pressure relief port through the pressure relief cavity, and flows to the pressure relief pipeline of the pipe joint through the stop valve 13, so that the pressure can be relieved safely and controllably.

[0030] During use, if the valve cavity pressure cannot be completely released due to factors such as internal leakage of the gate valve of the grease injection check valve, the push rod 12 can be retracted. If the grease injection check valve fails at this time, the stop valve 13 can be closed, and the pressure relief line can be connected to the hydraulic pump. Hydraulic oil can be injected into the grease injection check valve and the valve cavity through the pressure relief line to clean and lubricate the steel ball of the grease injection check valve to restore the seal.

[0031] The pressure relief device of the utility model can be connected with the grease injection check valve of the wellhead device and the gate valve; the live nut connection can adjust the connection direction at will; the leaked fluid can be safely and effectively collected through the control of the stop valve; the grease injection check valve and the gate valve can also be cleaned, lubricated and repaired by oil injection.

[0032] Although the present invention is described herein with reference to the illustrative embodiments of the present invention, the above embodiments are merely preferred embodiments of the present invention, and the embodiments of the present invention are not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A safety pressure relief device for a grease injection check valve, characterized in that: include: The stop valve, pipe joint, propulsion assembly and body, the pipe joint connected to the pressure relief pipeline is connected to the side of the body through the stop valve; the lower end of the body is rotatably connected to a live nut through the joint body, and is connected to the grease injection check valve through the live nut; the propulsion assembly is set through the body, joint body and live nut, and is used to push open the grease injection check valve steel ball of the grease injection check valve, so that the fluid in the grease injection check valve is relieved through the pressure relief device.

2. A safety pressure relief device for a grease injection check valve according to claim 1, characterized in that: The propulsion assembly includes: a connected propulsion screw and a push rod, the lower end of the propulsion screw is arranged in the through hole of the main body and is sealed with the main body thread, and the lower end of the push rod passes through the main body, the joint body and the live nut in sequence, so that the push rod is driven to move downward by rotating the propulsion screw, so that the push rod pushes open the grease injection check valve steel ball of the grease injection check valve.

3. A safety pressure relief device for a grease injection check valve according to claim 2, characterized in that: The body is threadedly connected to the advancement screw so that the advancement screw can be moved up and down in the body by rotating the advancement screw.

4. A safety pressure relief device for a grease injection check valve according to claim 3, characterized in that: The upper end of the body is provided with a sealing structure to achieve sealed installation between the upper end of the body and the advancing screw through the sealing structure.

5. A safety pressure relief device for a grease injection check valve according to claim 4, characterized in that: The sealing structure includes: a pressure cap, a pressure ring and a sealing packing sleeved on the outside of the advancing screw. The pressure cap connected to the external thread of the upper end of the body is tightened so that the pressure ring presses the sealing packing.

6. A safety pressure relief device for a grease injection check valve according to claim 2, characterized in that: The propulsion assembly further includes a handle connected to the propulsion screw.

7. A safety pressure relief device for a grease injection check valve according to claim 1, characterized in that: The joint body is threadedly connected to the main body.

8. The safety pressure relief device of a grease injection check valve according to claim 1, characterized in that: The movable nut is threadedly connected to the grease injection check valve.

9. The safety pressure relief device of a grease injection check valve according to claim 1, characterized in that: Copper pads and sealing pads are respectively provided at the upper and lower ends of the joint body.

10. A safety pressure relief device for a grease injection check valve according to any one of claims 1 to 9, characterized in that: A pressure relief port is provided on the side of the body, one end of the stop valve is connected to the pressure relief port, and the other end is connected to a pipe joint through a conversion joint.

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