Safety valve on-line verification device

Abstract

The utility model discloses a safety valve on-line verification device which comprises an inlet pipe, one end of the inlet pipe is connected with a connecting pipe, the end portion, far away from the inlet pipe, of the connecting pipe is connected with a verification unit, the end portion, far away from the connecting pipe, of the verification unit is provided with a safety valve, and the safety valve is connected with an outlet pipe. The safety valve checking device can check the safety valve on line, avoids dismounting and mounting of the safety valve, reduces labor intensity and high-altitude operation risks, does not need a crane, and saves production cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of safety valve calibration equipment, and in particular relates to an online calibration device for a safety valve. Background Art

[0002] During the natural gas extraction process, the ground gathering and transportation pipeline network, separator pre-dehydration unit, three-phase separator oil-water separation unit, desulfurization unit, and external transmission metering unit in the ground supporting process are equipped with safety valves for emergency venting when the equipment or pipeline network is overpressured. The safety valves need to be calibrated every year. Due to the operation requirements of the natural gas gathering and transportation station, the safety valves need to be manually disassembled from the equipment and pipeline network during calibration, transported to the calibration site, and installed after the calibration is completed. However, large safety valves are large in size and weight, and are very difficult to disassemble and assemble. They require operations such as high-altitude operations and pipeline opening, and require the cooperation of cranes. The calibration is labor-intensive and may cause personal injury. Gaskets may be damaged during manual disassembly and assembly, resulting in natural gas leakage. Utility Model Content

[0003] The utility model aims to provide an online calibration device for a safety valve, which solves the problem of difficulty in disassembly and assembly during calibration of the safety valve in the prior art.

[0004] The technical solution adopted by the utility model is: an online calibration device for a safety valve, comprising an inlet pipe, one end of the inlet pipe is connected to a connecting pipe, the end of the connecting pipe away from the inlet pipe is connected to a calibration unit, the end of the calibration unit away from the connecting pipe is a safety valve, and the safety valve is connected to an outlet pipe.

[0005] The utility model is also characterized in that:

[0006] The inlet pipe and the connecting pipe are connected via an inlet flange, and a control valve is connected to the pipe body of the connecting pipe.

[0007] The connecting pipe is connected to the verification unit via a first connecting flange, and the verification unit is connected with a quick connection mechanism.

[0008] The verification unit includes a verification tube, one end of which is connected to the first connecting flange, the other end of which is connected to the safety valve, the middle of the verification tube is connected to a safety tube, the inner wall of the safety tube is connected to a one-way air blocking unit, and the end of the safety tube away from the verification tube is connected to a quick connection mechanism.

[0009] The one-way air-blocking unit comprises a spring, one end of which is connected to the inner wall of the safety tube, and the other end of the spring is clamped with a one-way air-blocking steel ball.

[0010] The quick connection mechanism comprises an external thread opened on the outer wall of the safety tube, the external thread is arranged close to the end of the safety tube away from the calibration tube, and a safety cap is connected to the external thread.

[0011] The calibration pipe is connected to the safety valve through the second connecting flange.

[0012] The safety valve is connected to the outlet pipe through the outlet flange.

[0013] The beneficial effects of the utility model are as follows: the safety valve online calibration device of the utility model can calibrate the safety valve online, avoid the disassembly and installation of the safety valve, reduce the labor intensity and the risk of high-altitude operations, do not need to use a crane, and save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model safety valve online calibration device;

[0015] Figure 2 It is a structural schematic diagram of a verification unit in an online verification device for a safety valve of the utility model.

[0016] In the figure, 1. second connecting flange, 2. safety cap, 3. calibration unit, 31. calibration tube, 32. safety tube, 33. spring, 34. one-way air-blocking steel ball, 35. external thread, 4. control valve, 5. inlet pipe, 6. outlet pipe, 7. safety valve, 8. outlet flange, 9. inlet flange, 10. first connecting flange, 11. connecting pipe. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0018] The utility model provides an online safety valve calibration device, such as Figure 1 As shown, it includes an inlet pipe 5, one end of the inlet pipe 5 is connected to a connecting pipe 11, the end of the connecting pipe 11 away from the inlet pipe 5 is connected to a verification unit 3, the end of the verification unit 3 away from the connecting pipe 11 is a safety valve 7, and the safety valve 7 is connected to an outlet pipe 6. The end of the inlet pipe 5 is connected to the air intake pipeline, and the end of the outlet pipe 6 is connected to the venting system of the gas gathering and dehydration station. The medium enters the inlet pipe 5 from the air intake pipeline, passes through the connecting pipe 11 and the verification unit 3, and is in the system. The safety valve 7 is in a closed state under normal conditions. If the working pressure of the safety valve 7 exceeds the rated pressure of the safety valve 7, the safety valve 7 will start to relieve pressure. When the pressure is lower than the rated pressure, the safety valve returns to the seat and the pressure relief is completed.

[0019] When the safety valve 7 is calibrated, the air intake in the system is stopped, and the calibration medium is introduced from the calibration unit 3 to increase the pressure in the system to exceed the rated pressure of the safety valve 7. If the safety valve 7 trips, the calibration is completed.

[0020] Example 1

[0021] The safety valve online calibration device comprises an inlet pipe 5, one end of which is connected to a connecting pipe 11, an end of the connecting pipe 11 away from the inlet pipe 5 is connected to a calibration unit 3, an end of the calibration unit 3 away from the connecting pipe 11 is connected to a safety valve 7, and the safety valve 7 is connected to an outlet pipe 6.

[0022] The inlet pipe 5 and the connecting pipe 11 are connected via the inlet flange 9, and the connecting pipe 11 is connected to the control valve 4. Under normal conditions, the control valve 4 is in an open state, and when the safety valve 7 needs to be calibrated, the control valve 4 is closed.

[0023] The connecting pipe 11 is connected to the verification unit via a first connecting flange 10, and the verification unit is connected with a quick connection mechanism. When the safety valve 7 needs to be verified, the control valve 4 is closed, the quick connection mechanism is opened, and the verification medium is introduced from the verification unit.

[0024] Example 2

[0025] The safety valve online calibration device comprises an inlet pipe 5, one end of which is connected to a connecting pipe 11, an end of the connecting pipe 11 away from the inlet pipe 5 is connected to a calibration unit 3, an end of the calibration unit 3 away from the connecting pipe 11 is connected to a safety valve 7, and the safety valve 7 is connected to an outlet pipe 6.

[0026] The inlet pipe 5 and the connecting pipe 11 are connected via an inlet flange 9 , and the pipe body of the connecting pipe 11 is connected to the control valve 4 .

[0027] The connecting pipe 11 is connected to the verification unit via a first connecting flange 10, and the verification unit is connected with a quick connection mechanism.

[0028] like Figure 2 As shown, the verification unit 3 includes a verification tube 31, one end of which is connected to the first connecting flange 10, the other end of which is connected to the safety valve 7, a safety tube 32 is connected to the middle of the verification tube 31, a one-way air blocking unit is connected to the inner wall of the safety tube 32, and the end of the safety tube 32 away from the verification tube 31 is connected to the quick connection mechanism. Under normal conditions, the one-way air blocking unit blocks the end of the safety tube 32 under the pressure in the system, and cooperates with the quick connection mechanism to block the safety tube. When the safety valve 7 is calibrated, after closing the control valve 4, the quick connection mechanism is opened, and the verification medium is introduced into the safety tube 32. The verification medium pushes the one-way air blocking unit to move to the left, and the verification medium can enter the verification tube 31.

[0029] The one-way air blocking unit includes a spring 33, one end of which is connected to the inner wall of the safety tube 32, and the other end of the spring 33 is clamped with a one-way air blocking steel ball 34. The connection point between the spring 33 and the safety tube 32 is arranged near the connection between the safety tube 32 and the verification tube 31. The verification medium is introduced into the safety tube 32, and the verification medium uses its own pressure to push the one-way air blocking steel ball 34 to compress the spring 33, so that the verification medium can enter the verification tube 31.

[0030] Example 3

[0031] The safety valve online calibration device comprises an inlet pipe 5, one end of which is connected to a connecting pipe 11, an end of the connecting pipe 11 away from the inlet pipe 5 is connected to a calibration unit 3, an end of the calibration unit 3 away from the connecting pipe 11 is connected to a safety valve 7, and the safety valve 7 is connected to an outlet pipe 6.

[0032] The inlet pipe 5 and the connecting pipe 11 are connected via an inlet flange 9 , and the pipe body of the connecting pipe 11 is connected to the control valve 4 .

[0033] The connecting pipe 11 is connected to the verification unit via a first connecting flange 10, and the verification unit is connected with a quick connection mechanism.

[0034] like Figure 2 As shown, the verification unit 3 includes a verification tube 31, one end of the verification tube 31 is connected to the first connecting flange 10, the other end of the verification tube 31 is connected to the safety valve 7, the middle of the verification tube 31 is connected to a safety tube 32, the inner wall of the safety tube 32 is connected to a one-way air blocking unit, and the end of the safety tube 32 away from the verification tube 31 is connected to a quick connection mechanism.

[0035] The one-way air blocking unit comprises a spring 33 , one end of which is connected to the inner wall of the safety tube 32 , and the other end of the spring 33 is clamped with a one-way air blocking steel ball 34 .

[0036] The quick connection mechanism includes an external thread 35 opened on the outer wall of the safety tube 32, the external thread 35 is arranged near the end of the safety tube 32 away from the calibration tube 31, and the safety cap 2 is connected to the external thread 35. The safety cap 2 is threadedly connected through the external thread 35, and cooperates with the one-way air blocking steel ball 34 to block the safety tube 32.

[0037] The calibration pipe 31 is connected to the safety valve 7 via the second connecting flange 1 .

[0038] The safety valve 7 is connected to the outlet pipe 6 via an outlet flange 8 .

[0039] The working principle of the utility model safety valve online calibration device is as follows:

[0040] Under normal conditions, the safety valve 7 is in a closed state, the control valve 4 is in an open state, and the safety cap 2 closes the safety tube 32. When calibration is required, close the control valve 4, unscrew the safety cap 2, and introduce the calibration medium into the safety tube 32. The calibration medium uses its own pressure to push the one-way air blocking steel ball 34 to compress the spring 33, and the calibration medium can enter the calibration tube 31, increasing the pressure in the system to exceed the rated pressure of the safety valve 7. If the safety valve 7 jumps, it proves that the safety valve 7 is in a normal state and the calibration is completed.

[0041] The utility model discloses an online safety valve calibration device, which solves the problems of high labor intensity for workers during traditional safety valve calibration, possible personal injury, high risk of disassembly and assembly, need for crane cooperation and high cost.

Claims

1. Safety valve online calibration device, characterized in that: It comprises an inlet pipe (5), one end of the inlet pipe (5) is connected to a connecting pipe (11), an end of the connecting pipe (11) away from the inlet pipe (5) is connected to a verification unit (3), an end of the verification unit (3) away from the connecting pipe (11) is connected to a safety valve (7), and the safety valve (7) is connected to an outlet pipe (6); The connecting pipe (11) is connected to the verification unit via a first connecting flange (10), and the verification unit is connected with a quick connection mechanism; The verification unit (3) comprises a verification tube (31), one end of the verification tube (31) being connected to a first connection flange (10), the other end of the verification tube (31) being connected to a safety valve (7), a safety tube (32) being connected to the middle of the verification tube (31), a one-way air blocking unit being connected to the inner wall of the safety tube (32), and an end of the safety tube (32) away from the verification tube (31) being connected to a quick connection mechanism.

2. The safety valve online verification device according to claim 1, characterized in that: The inlet pipe (5) and the connecting pipe (11) are connected via an inlet flange (9), and the pipe body of the connecting pipe (11) is connected to a control valve (4).

3. The safety valve online verification device according to claim 1, characterized in that: The one-way air blocking unit comprises a spring (33), one end of the spring (33) is connected to the inner wall of the safety tube (32), and the other end of the spring (33) is internally clamped with a one-way air blocking steel ball (34).

4. The safety valve online verification device according to claim 1, characterized in that: The quick connection mechanism comprises an external thread (35) formed on the outer wall of the safety tube (32), the external thread (35) being arranged close to the end of the safety tube (32) away from the calibration tube (31), and a safety cap (2) being connected to the external thread (35).

5. The safety valve online verification device according to claim 1, characterized in that: The calibration pipe (31) is connected to the safety valve (7) via a second connecting flange (1).

6. The safety valve online verification device according to claim 1, characterized in that: The safety valve (7) is connected to the outlet pipe (6) via an outlet flange (8).

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