Pilot-operated safety valve testing device and automatic testing system

Abstract

This utility model discloses a pilot-operated safety valve testing device and automatic testing system, configured for online testing of the pilot-operated safety valve body. It includes a medium source, a main pipeline, a pressure stabilizing unit, a third verification switch, and a testing unit. The medium source is connected to one end of the pressure stabilizing unit via the main pipeline, and the other end of the pressure stabilizing unit is connected to one or more branch pipelines. A third verification switch is installed on each branch pipeline. The advantages of this utility model are: by connecting the branch pipelines to different locations on the pilot-operated safety valve body, the sensitivity of the pilot valve body can be tested individually; alternatively, the linkage performance of the entire pilot-operated safety valve body can be tested.

Description

Technical Field

[0001] This utility model relates to the field of pilot-operated safety valve testing technology, and in particular to a pilot-operated safety valve testing device and automatic testing system. Background Technology

[0002] A pilot-operated safety valve is a safety protection valve. Its opening and closing elements are normally closed under external force. When the pressure of the medium in the equipment or pipeline rises and exceeds a specified value, it automatically opens, releasing the medium to the outside of the system to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value. A pilot-operated safety valve consists of a pilot valve and a main valve. The working principle of a pilot-operated safety valve is as follows: Under the action of a spring force, the upper sealing surface of the pilot valve is in a closed state. The inlet of the main valve is connected to the upper air chamber of the piston through the pilot valve. The medium enters the upper air chamber of the main valve piston through the pilot valve. Because the upper acting area of ​​the piston is larger than the sealing area of ​​the main valve disc, the piston is subjected to a downward net force, thus keeping the main valve in a sealed state. When the pressure at the main valve inlet rises to the set pressure, the pilot valve opens first. The medium in the main valve air chamber is released outward through the upper sealing surface of the pilot valve. A pressure difference is formed above and below the floating plug valve. The plug valve moves upward, closing the passage from the main valve inlet to the air chamber, and the air chamber pressure drops rapidly. When the pressure in the gas chamber drops to a certain level, the upward force on the main valve piston is greater than the sum of the downward force and the frictional force, causing the piston to move upward and open for discharge.

[0003] To prevent the pressure of the medium in pipelines or equipment from exceeding the specified value, pilot-operated safety valves need to be periodically tested for their set pressure value and the airtightness of each component. Only when the pilot-operated safety valve is functioning properly can it protect the equipment or pipeline. Currently, the commonly used testing method for pilot-operated safety valves is as follows: First, disconnect the pressure-conducting pipe connecting the main valve and the pilot valve. Connect a pressure test air source to the inlet of the pilot valve, pressurize the pilot valve, and then test the set pressure of the safety valve. After the test, the pressure-conducting pipe needs to be reconnected between the main valve and the pilot valve. The current testing method for pilot-operated safety valves has the following disadvantages: 1. The disassembly and installation of the pressure-conducting pipe is inconvenient, increasing the difficulty and cost of the testing process; 2. Repeated disassembly and installation of the pressure-conducting pipe can affect the airtightness between the pilot valve and the main valve; 3. The test results of the existing method are unstable. When there is air leakage in the air inlet line below the main valve, the detected set pressure value will have a large error.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is: to solve the problem of the difficulty in on-site testing of pilot-operated safety valves.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] This utility model claims protection for a pilot-operated safety valve detection device, configured for online detection of the pilot-operated safety valve body. The pilot-operated safety valve detection device includes a medium source, a main pipeline, a pressure stabilizing unit, a third verification switch, and a detection unit. The medium source is connected to one end of the pressure stabilizing unit through the main pipeline, and the other end of the pressure stabilizing unit is connected to one or more branch pipelines. A third verification switch and a first detection unit are installed on the branch pipelines.

[0008] By connecting branch pipes to different locations on the pilot-operated safety valve body, the sensitivity of the pilot valve body can be tested individually, or the linkage performance of the entire pilot-operated safety valve body can be tested.

[0009] Preferably, the voltage stabilizing unit is an airbag.

[0010] The airbag is used for pressure stabilization, so that the air source input by the medium source can flow and operate stably.

[0011] Preferably, the medium source is a gas source machine.

[0012] An air source unit is a device that generates, processes, and stores compressed air to provide an air supply.

[0013] Preferably, a joint is installed at the end of the branch pipe that is far from the pressure stabilizing unit.

[0014] The connector is used to connect the body of the pilot-operated safety valve to the branch pipe.

[0015] Preferably, a digital display of gas source pressure is installed on the main pipeline.

[0016] Used to detect the air pressure output from the main pipeline.

[0017] Preferably, the first detection unit is a pressure sensor.

[0018] Preferably, when there are multiple branch pipes, the main pipe and the branch pipes are connected by a multi-port vent connector.

[0019] This utility model also claims protection for an automatic detection system for a pilot-operated safety valve that employs a pilot-operated safety valve detection device, comprising a second detection unit, a processor, a display, and a pilot-operated safety valve detection device. The second detection unit is in close contact with the pilot-operated safety valve body and is electrically connected to the processor. The processor is network-connected to the display.

[0020] The second detection unit senses the sound from the valve body and outputs a signal to the processor. The processor receives the signal, processes it, and sends it to the display, enabling personnel to remotely verify the online inspection status of the pilot-operated safety valve body.

[0021] Preferably, the second detection unit is an audio sensor.

[0022] Preferably, the processor is an acoustic emission leak detector. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the pilot-operated safety valve body in Embodiment 1 of this utility model;

[0024] Figure 2 This is a schematic diagram of the connection between the pilot-operated safety valve body and the pilot-operated safety valve detection device in Embodiment 1 of this utility model;

[0025] Figure 3 This is a schematic diagram of the connection between the pilot-operated safety valve body and the pilot-operated safety valve detection device in Embodiment 2 of this utility model;

[0026] 1. Audio sensor; 2. Acoustic emission leak detector; 3. Computer;

[0027] 401. Valve body; 402. Medium inlet; 403. First port; 404. Main valve core; 405. Medium outlet; 406. Second port; 407. First connecting pipe; 408. Second connecting pipe;

[0028] 41. Pilot valve body; 410. Third port; 411. Fourth port;

[0029] 50. Gas source unit; 51. Main pipeline; 52. Digital display of gas source pressure; 53. Airbag; 54. First branch pipeline; 55. Second branch pipeline; 56. Pilot valve calibration switch; 57. First pilot valve pressure sensor; 58. Pilot valve connector; 59. Main valve calibration switch; 60. Main valve pressure sensor; 61. Main valve connector;

[0030] 70. Fourth branch pipe; 71. Third verification switch; 72. Transition joint; 73. Second pilot valve pressure sensor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Example 1

[0033] See Figures 1-2This embodiment requires a pilot-operated safety valve detection device for online verification of the pilot-operated safety valve body; the pilot-operated safety valve body is a type of non-direct load safety valve, including a main valve body and a pilot valve body 41; the main valve body is the core component in the system that directly controls the flow on / off or direction of fluid.

[0034] The main valve body includes a valve body 401, a medium inlet 402, a first interface 403, a main valve core 404, a medium outlet 405, a second interface 406, a first connecting pipe 407, and a second connecting pipe 408. A valve cavity is provided within the valve body 401, and the main valve core 404 is located in the middle of the valve cavity. The main valve core 404 divides the valve cavity into an upper valve cavity and a lower valve cavity. A medium inlet 402 and a medium outlet 405 are respectively provided at the bottom and side of the valve body 401. Both the medium inlet 402 and the medium outlet 405 communicate with the valve cavity. The lower side of the valve body 401... A first interface 403 is provided on the valve body 401, which is connected to the lower valve chamber. A second interface 406 is provided on the top of the valve body 401, which is connected to the upper valve chamber. The first interface 403 is connected to the third interface 410 of the pilot valve body 41 through the first connecting pipe 407. The fourth interface 411 of the pilot valve body 41 is connected to the second interface 406 through the second connecting pipe 408. The medium inlet 402 is connected to the special equipment through the input pipe (not shown in the figure). A shut-off valve (not shown in the figure) is provided near the input pipe port of the special equipment.

[0035] The pilot-operated safety valve is used for safety protection as follows: when the medium pressure reaches the opening pressure of the pilot valve body 41, the pilot valve body 41 opens first. The medium discharged from the boiler enters the lower valve chamber, the first connecting pipe 407 and the pilot valve body 41 in sequence from the input pipe. Based on the medium pressure, the pilot valve body 41 outputs the medium to the upper valve chamber through the second connecting pipe 408, and controls the main valve body to discharge the medium to the medium outlet 405. This is existing technology and will not be described in detail.

[0036] The pilot-operated safety valve testing device includes a gas source unit 50, a main pipeline 51, a digital display of gas source pressure 52, an air bladder 53, a first branch pipeline 54, a second branch pipeline 55, a pilot valve calibration switch 56, a first pilot valve pressure sensor 57, a pilot valve connector 58, a main valve calibration switch 59, a main valve pressure sensor 60, and a main valve connector 61.

[0037] The gas source unit 50 is used to provide the gas source required for testing. The gas source unit 50 is connected to one end of the air bag 53 through the main pipe 51. A digital display gauge 52 for gas source pressure is installed on the main pipe 51. The digital display gauge 52 for gas source pressure is an electronic measuring instrument specifically used for monitoring and displaying gas source pressure. It is existing technology and will not be described in detail. The other end of the air bag 53 is connected to the first branch pipe 54 and the second branch pipe 55 through the air pipe connector. A pilot valve calibration switch 56 and a first pilot valve pressure sensor 57 are installed sequentially on the first branch pipe 54. A pilot valve connector 58 is installed at the other end of the first branch pipe 54.

[0038] The air pipe connector can be a three-way air pipe connector, which is a fitting used to connect three-way pneumatic pipes. It can realize the splitting or merging of gas in multiple directions. As it is existing technology, it will not be described in detail.

[0039] The other end of the second branch pipe 55 is provided with a main valve connector 61, and the second branch pipe 55 is provided with a main valve verification switch 59 and a main valve pressure sensor 60 in sequence.

[0040] The process of using this pilot-operated safety valve testing device for online verification of the pilot-operated safety valve body is as follows:

[0041] First, close the shut-off valve;

[0042] Secondly, slowly loosen the first connector 407 and listen to the exhaust sound at the loosened point of the first connector 407;

[0043] Then, if there is an exhaust sound and it does not change, tighten the first connecting pipe 407. It is initially determined that the shut-off valve seal is damaged and the shut-off valve needs to be repaired before the online calibration of the pilot-operated safety valve testing device is performed.

[0044] If you can clearly hear the exhaust sound decrease, continue to loosen the first connecting pipe 407 until there is no exhaust sound at all, then remove the inlet pipe;

[0045] Then, the pilot valve connector 58 is connected to the third interface 410, and the main valve connector 61 is connected to the third interface 410;

[0046] Finally, the online testing of the pilot-operated safety valve detection device includes: 1. Turning on the air source unit 50 and only turning on the pilot-operated safety valve detection device. The air source is regulated by the air bag 53, enters the first branch pipe 54 and then enters the pilot valve body 41. The display of the first pilot valve pressure sensor 57 is observed to test the sensitivity of the pilot valve body 41; 2. Turning on the air source unit 50 and simultaneously turning on the main valve calibration switch 59 and the pilot valve calibration switch 56. The air source is regulated by the air bag, and enters the pilot valve body 41 through the first branch pipe 54 and the main valve body through the second branch pipe 55. The output pressure of the pilot valve body 41 is simulated to open the main valve body, thus testing the linkage performance of the entire pilot-operated safety valve body.

[0047] Example 2

[0048] See Figure 3 The difference between this embodiment and the previous embodiment is that the other end of the airbag 53, which is far from the air source pressure digital display 52, is connected to one end of the fourth branch pipe 70. The other end of the fourth branch pipe 70 is sequentially provided with a third verification switch 71 and a transition joint 72. A second pilot valve pressure sensor 73 is provided on the fourth branch pipe 70.

[0049] The process of using this pilot-operated safety valve testing device for online verification of the pilot-operated safety valve body is as follows:

[0050] First, close the shut-off valve;

[0051] Secondly, slowly loosen the first connector 407 and listen to the exhaust sound at the loosened point of the first connector 407;

[0052] Then, if there is an exhaust sound and it does not change, tighten the first connecting pipe 407. It is initially determined that the shut-off valve seal is damaged and the shut-off valve needs to be repaired before the online calibration of the pilot-operated safety valve testing device is performed.

[0053] If you can clearly hear the exhaust sound decrease, continue to loosen the first connector 407 until there is no exhaust sound at all, then tighten the first connector 407.

[0054] Then, the transition connector 72 is connected to the input pipe;

[0055] Finally, turn on the air source unit 50 and the third verification switch 71. The air source is stabilized by the air bag 53 and enters the fourth branch pipe 70, the main valve body, the first connecting pipe 407 and the pilot valve body 41. Simulate the output pressure of the pilot valve body 41 to open the main valve body. Observe the second pilot valve pressure sensor 73 and the display to verify the linkage performance of the entire pilot-operated safety valve body.

[0056] Based on Embodiments 1 and 2, this embodiment also provides a pilot-operated safety valve automatic detection system, including an audio sensor 1, an acoustic emission leak detector 2, and a computer 3. The sensing end of the audio sensor 1 is in close contact with the valve body 401, the audio sensor 1 is electrically connected to the acoustic emission leak detector 2, and the acoustic emission leak detector 2 is network connected to the computer 3.

[0057] The automatic online monitoring process of the pilot-operated safety valve detection system is as follows: the audio sensor 1 senses the exhaust sound of the valve body 401 and outputs a signal to the acoustic emission leak detector 2. The acoustic emission leak detector 2 receives the signal, processes it, and sends it to the computer 3, enabling personnel to remotely verify the online inspection status of the pilot-operated safety valve body.

[0058] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pilot-operated safety valve detection device, configured for online detection of the pilot-operated safety valve body, characterized in that, The pilot-operated safety valve testing device includes a medium source, a main pipeline (51), a pressure stabilizing unit, a verification switch, and a testing unit. The medium source is connected to one end of the pressure stabilizing unit through the main pipeline (51), and the other end of the pressure stabilizing unit is connected to one or more branch pipelines. A third verification switch and a first testing unit are installed on the branch pipelines.

2. The pilot operated safety valve testing device of claim 1, wherein, The pressure stabilizing unit is an airbag (53).

3. The pilot operated safety valve testing device of claim 1, wherein, The medium source is a gas source machine (50).

4. The pilot operated safety valve testing device of claim 1, wherein, A joint is installed at the end of the branch pipe that is far from the pressure stabilizing unit.

5. The pilot operated safety valve testing device of claim 1, wherein, A digital display of gas source pressure (52) is installed on the main pipeline (51).

6. The pilot operated safety valve testing device of claim 1, wherein, The first detection unit is a pressure sensor.

7. The pilot operated safety valve testing device of claim 1, wherein, When there are multiple branch pipes, the main pipe (51) and the branch pipes are connected by a multi-port vent joint.

8. A pilot operated safety valve automatic testing system employing the pilot operated safety valve testing device of any one of claims 1 to 7, characterized in that, It includes a second detection unit, a processor, a display, and a pilot-operated safety valve detection device. The second detection unit is in close contact with the pilot-operated safety valve body and is electrically connected to the processor. The processor is network-connected to the display.

9. The pilot operated safety valve automated testing system of claim 8, wherein, The second detection unit is an audio sensor (1).

10. The pilot operated safety valve automated testing system of claim 8, wherein, The processor is an acoustic emission leak detector (2).

Images