A safety valve and PV valve test device

Abstract

The present invention provides a safety valve and a PV valve test device, comprising: a pressure supply component and a first test component; the pressure supply component includes a pressure buffer tank, an air ejector, a high-pressure air pipeline, a liquid nitrogen pipeline, a first pipeline, a second pipeline and a third pipeline; the pressure buffer tank is respectively provided with a first input port, a second input port, a first output port and a second output port, and a pressure gauge is installed on the pressure buffer tank; the first test component includes a first gas transmission pipeline, at least one first test pipeline and at least one first valve seat. Compared with the prior art, the safety valve and the PV valve test device of the present invention ingeniously integrates the equipment required for the maintenance of the safety valve and the PV valve into one body. By only opening the valves of different pipelines, the tests can be respectively carried out on ordinary safety valves, LNG safety valves and PV valves. Its operation is simple, the equipment cost is low, and the maintenance efficiency is high. By setting the pressure buffer tank, the accuracy during the test can be higher and it is safer.

Description

Technical Field

[0001] The present invention relates to the field of pressure testing of safety valves and PV valves, and particularly to a test device for safety valves and PV valves. Background Art

[0002] Common safety valves include ordinary safety valves and LNG valves. Among them, ordinary safety valves can be pressure-tested with compressed air to check whether they can be used normally; LNG valves are usually pressure-tested with liquid nitrogen to check whether they can be used normally. And PV (Pressure Vacuum) valves are usually pressure-tested with vacuum pressure to check whether they can be used normally.

[0003] Currently, for the pressure testing and maintenance of these valves, usually each uses its own equipment to carry out, and it is impossible to complete the pressure testing and maintenance of safety valves and PV valves through one device, resulting in troublesome operation, high equipment cost, low maintenance efficiency, high equipment loss, and easy equipment damage. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device for safety valves and PV valves to solve the disadvantages and deficiencies in the prior art.

[0005] A test device for safety valves and PV valves of the present invention includes: a pressure providing assembly and a first test assembly;

[0006] The pressure providing assembly includes a pressure buffer tank, an air ejector, a high-pressure air pipeline, a liquid nitrogen pipeline, a first pipeline, a second pipeline, and a third pipeline;

[0007] The pressure buffer tank is respectively provided with a first input port, a second input port, a first output port, and a second output port, and a pressure gauge is installed on the pressure buffer tank; the air ejector has a compressed air inlet, an entrained air inlet, and a mixed gas outlet;

[0008] Two ends of the first pipeline are respectively connected to the high-pressure air pipeline and the first input port; two ends of the second pipeline are respectively connected to the high-pressure air pipeline and the compressed air inlet of the air ejector; two ends of the third pipeline are respectively connected to the first output port and the entrained air inlet of the air ejector; the liquid nitrogen pipeline is connected to the second input port;

[0009] The first test assembly includes a first gas transmission pipeline, at least one first test pipeline, and at least one first valve seat; one end of the first gas transmission pipeline is connected to the second output port, and the other end is in a closed state; one end of the first test pipeline is connected to the first gas transmission pipeline, and the other end is connected to the first valve seat; the first valve seat is used for installing a safety valve or a PV valve;

[0010] Valves are provided on the liquid nitrogen pipeline, the first pipeline, the second pipeline, the third pipeline, the first gas transmission pipeline, and the first test pipeline.

[0011] Compared with the prior art, the safety valve and PV valve test device of the present invention ingeniously integrates the equipment required for the maintenance of safety valves and PV valves into one. By simply opening the valves of different pipelines, tests can be respectively carried out on ordinary safety valves, LNG safety valves, and PV valves. Its operation is simple, the equipment cost is low, the maintenance efficiency is high, and by setting up a pressure buffer tank, the accuracy during the test can be higher and it is safer.

[0012] In a preferred or alternative embodiment, the pressure providing component further includes an air dryer; the air dryer is arranged on the high-pressure air pipeline for drying the air in the high-pressure air pipeline.

[0013] In a preferred or alternative embodiment, the first test component further includes a first operation table, which is arranged close to the first valve seat for convenient operation.

[0014] In a preferred or alternative embodiment, the first test component further includes a first sealing cover plate, which is detachably connected to the first valve seat to prevent the valve seat from being contaminated by impurities.

[0015] In a preferred or alternative embodiment, the first experimental device further includes a first sealing gasket, which is arranged between the first sealing cover plate and the first valve seat to enhance the sealing.

[0016] In a preferred or alternative embodiment, a second test component is further included, and a third output port is further provided on the pressure buffer tank;

[0017] The second test component includes a second gas transmission pipeline, at least one second test pipeline, and at least one second valve seat; one end of the second gas transmission pipeline is connected to the third output port, and the other end is in a closed state; one end of the second test pipeline is connected to the second gas transmission pipeline, and the other end is connected to the second valve seat; the second valve seat is used for installing a safety valve or a PV valve, and valves are provided on both the second gas transmission pipeline and the second test pipeline.

[0018] In a preferred or alternative embodiment, the second test component further includes a second operation table, which is arranged close to the second valve seat.

[0019] In a preferred or alternative embodiment, the second experimental device further includes a second sealing cover plate, which is matched with the second valve seat.

[0020] In a preferred or alternative embodiment, the second experimental device further includes a second sealing gasket disposed between the second sealing cover plate and the second valve seat. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the safety valve and PV valve test device of the present invention. Detailed Embodiments

[0022] Please refer to Figure 1 , this embodiment provides a safety valve and PV valve test device, which includes a pressure providing component and a first test component. The pressure providing component can provide high-pressure air, low-temperature liquid nitrogen or vacuum pressure for the first test component, so that the first test component can repair the safety valve or PV valve to be tested.

[0023] Specifically, the pressure providing component includes a pressure buffer tank 11, an air ejector 12, a high-pressure air pipeline 13, a liquid nitrogen pipeline 14, a first pipeline 15, a second pipeline 16 and a third pipeline 17.

[0024] The pressure buffer tank 11 is provided to buffer the pressure fluctuation of the high-pressure gas, making the pressure provided by the pressure providing component more stable. The high-pressure air pipeline 13 can provide compressed air, and the liquid nitrogen pipeline 14 can provide low-temperature nitrogen. An insulating layer can be installed on the outer wall of the liquid nitrogen pipeline 14 to reduce losses.

[0025] In this embodiment, the pressure buffer tank 11 is respectively provided with a first input port, a second input port, a first output port and a second output port, and a pressure gauge 111 is installed on the pressure buffer tank 11.

[0026] The air ejector 12 has a compressed air inlet, an entrained air inlet and a mixed gas outlet; the air ejector 12 is a commonly used device in the prior art to obtain a vacuum. The compressed air pipeline can be connected to the compressed air inlet, and the chamber to be aspirated can be connected to the entrained air inlet. After the compressed air enters the air ejector 12, the air in the chamber to be aspirated can be sucked in from the entrained air inlet, and the two are discharged from the mixed gas outlet, so that the chamber to be extracted presents a vacuum state.

[0027] In this embodiment, the two ends of the first pipeline 15 are respectively connected to the high-pressure air pipeline 13 and the first input port; the two ends of the second pipeline 16 are respectively connected to the high-pressure air pipeline 13 and the compressed air inlet of the air ejector 12; the two ends of the third pipeline 17 are respectively connected to the first output port and the entrained air inlet of the air ejector 12; the liquid nitrogen pipeline 14 is connected to the second input port.

[0028] The first test assembly includes a first gas transmission pipeline 21, at least one first test pipeline 22, and at least one first valve seat 23; one end of the first gas transmission pipeline 21 is connected to the second output port, and the other end is in a closed state; one end of the first test pipeline 22 is connected to the first gas transmission pipeline 21, and the other end is connected to the first valve seat 23; the first valve seat 23 is used to install a safety valve or a PV valve; the number and size of the first test pipeline 22 and the first valve seat 23 can be designed according to requirements. For example, in this embodiment, the number of the first test pipeline 22 and the first valve seat 23 is 6 each, one first test pipeline 22 corresponds to one first valve seat 23, and each first valve seat 23 is designed with different sizes for maintaining safety valves or PV valves of different sizes.

[0029] Valves 30 are provided on the liquid nitrogen pipeline 14, the first pipeline 15, the second pipeline 16, the third pipeline 17, the first gas transmission pipeline 21, and the first test pipeline 22. In this embodiment, the valves on the liquid nitrogen pipeline 14, the first pipeline 15, the second pipeline 16, the third pipeline 17, the first gas transmission pipeline 21, and the first test pipeline 22 are all ball valves. In some other embodiments, the valve can also be other valves for controlling the pipeline switch.

[0030] The usage method of the safety valve and PV valve test device in this embodiment is as follows:

[0031] (1) When conducting a general safety valve test:

[0032] Select the first valve seat 23 to be installed according to the size of the safety valve to be tested, and then install the safety valve to be tested on the first valve seat 23;

[0033] Open the valve of the first pipeline 15, the valve of the first gas transmission pipeline 21, and the valve of the first test pipeline 22 corresponding to the first valve seat 23 on which the safety valve to be tested is installed;

[0034] Open the air supply switch of the high-pressure air pipeline 13, and the compressed air sequentially passes through the first pipeline 15, the pressure buffer tank 11, the first gas transmission pipeline 21, and the first test pipeline 22 and enters the safety valve to be tested, and the pressure buffer tank 11 makes the pressure at the safety valve to be tested rise stably and slowly;

[0035] Observe the pressure gauge 111 of the pressure buffer tank 11. When approaching the test pressure, close the valve of the first test pipeline 22 corresponding to the first valve seat 23 on which the safety valve to be tested is installed to make the pressure rise more slowly. When the pressure reaches the test pressure, observe whether the safety valve to be tested pops up.

[0036] (2) When conducting an LNG safety valve test:

[0037] Select the first valve seat 23 to be installed according to the size of the safety valve to be tested, and then install the safety valve to be tested on the first valve seat 23;

[0038] Open the valve of the liquid nitrogen pipeline 14, the valve of the first gas transmission pipeline 21, and the valve of the first test pipeline 22 corresponding to the first valve seat 23 on which the safety valve to be tested is installed;

[0039] The low-temperature nitrogen gas passes through the pressure buffer tank 11, the first gas transmission pipeline 21, and the first test pipeline 22 in sequence and enters the safety valve to be tested, and the pressure buffer tank 11 makes the pressure at the safety valve to be tested rise stably and slowly;

[0040] Observe the pressure gauge 111 of the pressure buffer tank 11. When approaching the test pressure, close the valve of the first test pipeline 22 corresponding to the first valve seat 23 on which the safety valve to be tested is installed to make the pressure rise more slowly. When the pressure reaches the test pressure, observe whether the safety valve to be tested pops up.

[0041] (3) When conducting the PV valve vacuum test:

[0042] Select the first valve seat 23 to be installed according to the size of the PV valve to be tested, and then install the PV valve to be tested on the first valve seat 23;

[0043] Open the valve of the second pipeline 16, the valve of the third pipeline 17, the valve of the first gas transmission pipeline 21, and the valve of the first test pipeline 22 corresponding to the first valve seat 23 on which the PV valve to be tested is installed;

[0044] Open the air supply switch of the high-pressure air pipeline 13. The compressed air passes through the second pipeline 16 and is ejected from the air ejector 12 to take away the air in the pressure buffer tank 11, creating a vacuum in the pressure buffer tank 11, thereby creating a vacuum in the PV valve to be tested;

[0045] Observe the pressure gauge 111 of the pressure buffer tank 11. When approaching the test pressure, close the valve of the first test pipeline 22 corresponding to the first valve seat 23 on which the PV valve to be tested is installed to make the pressure drop more slowly. When the pressure reaches the test pressure, observe whether the PV valve to be tested pops up.

[0046] It can be seen that the safety valve and PV valve test device of the present invention ingeniously integrates the equipment required for the maintenance of the safety valve and the PV valve into one. Only by opening the valves of different pipelines, the tests can be respectively carried out on ordinary safety valves, LNG safety valves and PV valves. Its operation is simple, the equipment cost is low, the maintenance efficiency is high, and by setting the pressure buffer tank 11, the accuracy during the test can be higher and it is safer.

[0047] Further, the pressure providing component in this embodiment may further include an air dryer 18; the air dryer 18 is disposed on the high-pressure air pipeline 13 for drying the air in the high-pressure air pipeline 13, ensuring the dryness of the compressed air and preventing the pipeline from rusting.

[0048] For the convenience of operation, preferably, the first test component further includes a first operation table 24, which is disposed close to the first valve seat 23. The first operation table 24 can be used to place and install the safety valve or PV valve to be tested, as well as tools for disassembly and assembly.

[0049] In order to avoid the contamination of the chamber of the first valve seat 23 by impurities when the test is not required, preferably, the first test component further includes a first sealing cover plate 25, which is detachably connected to the first valve seat 23 to ensure the cleanliness of the first valve seat 23 when it is not in use. The first experimental device may further include a first sealing gasket, which is disposed between the first sealing cover plate 25 and the first valve seat 23 to further enhance the sealing performance between the first valve seat 23 and the first sealing cover plate 25. In this embodiment, the first sealing gasket is a rubber gasket.

[0050] As a preferred embodiment, the safety valve and PV valve test device of the present invention may further include a second test component, and a third output port is further provided on the pressure buffer tank 11;

[0051] The second test component includes a second gas transmission pipeline 41, at least one second test pipeline 42 and at least one second valve seat 43; one end of the second gas transmission pipeline 41 is connected to the third output port, and the other end is in a closed state; one end of the second test pipeline 42 is connected to the second gas transmission pipeline 41, and the other end is connected to the second valve seat 43; the second valve seat 43 is used for installing a safety valve or a PV valve. Valves 30 are provided on both the second gas transmission pipeline 41 and the second test pipeline 42. The number and size of the second test pipeline 42 and the second valve seat 43 can be designed according to requirements.

[0052] It can be understood from the above description that the first test component and the second test component are basically the same. The purpose of setting the second experimental device is mainly to separate the test of the LNG safety valve from the tests of ordinary safety valves and PV valves. Since condensate is likely to appear during the pressure test using liquid nitrogen, which can easily contaminate the valve body, cause the pipeline to become brittle, and result in metal oxide contamination of the valve body, the test of the LNG valve can be carried out on the first test component, and the tests of ordinary safety valves and PV valves can be carried out on the second test component to reduce the failure rate of the device.

[0053] Furthermore, the second test component further includes a second operating table 44, which is disposed close to the second valve seat 43. The second operating table 44 can also be used to place and install the safety valve or PV valve to be tested, as well as tools for disassembly and assembly.

[0054] Similarly, the second experimental device may further include a second sealing cover plate 45, which is matched with the second valve seat 43 to prevent the chamber of the second valve seat 43 from being contaminated by impurities. The second experimental device may also include a second sealing gasket, which is disposed between the second sealing cover plate 45 and the second valve seat 43 to further enhance the sealing performance between the second valve seat 43 and the second sealing cover plate 45.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0056] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A safety valve and PV valve test device, characterized in that, Comprising: A pressure providing component and a first test component; The pressure providing component includes a pressure buffer tank, an air ejector, a high-pressure air pipeline, a liquid nitrogen pipeline, a first pipeline, a second pipeline, and a third pipeline; The pressure buffer tank is respectively provided with a first input port, a second input port, a first output port, and a second output port, and a pressure gauge is installed on the pressure buffer tank; The air ejector has a compressed air inlet, an entrained air inlet, and a mixed gas outlet; Both ends of the first pipeline are respectively connected to the high-pressure air pipeline and the first input port; Both ends of the second pipeline are respectively connected to the high-pressure air pipeline and the compressed air inlet of the air ejector; Both ends of the third pipeline are respectively connected to the first output port and the entrained air inlet of the air ejector; The liquid nitrogen pipeline is connected to the second input port; The first test component includes a first gas transmission pipeline, at least one first test pipeline, and at least one first valve seat; One end of the first gas transmission pipeline is connected to the second output port, and the other end is in a closed state; One end of the first test pipeline is connected to the first gas transmission pipeline, and the other end is connected to the first valve seat; The first valve seat is used to install a safety valve or a PV valve; The first test component further includes a first sealing cover plate, and the first sealing cover plate is detachably connected to the first valve seat; The first test component further includes a first sealing gasket, and the first sealing gasket is arranged between the first sealing cover plate and the first valve seat; The first test component further includes a first operating platform, and the first operating platform is arranged close to the first valve seat; Valves are provided on the liquid nitrogen pipeline, the first pipeline, the second pipeline, the third pipeline, the first gas transmission pipeline, and the first test pipeline.

2. The safety valve and PV valve test device according to claim 1, characterized in that: The pressure providing component further includes an air dryer; The air dryer is arranged on the high-pressure air pipeline and is used to dry the air in the high-pressure air pipeline.

3. The safety valve and PV valve test device according to claim 1, characterized in that, It further includes a second test component, and the pressure buffer tank is further provided with a third output port; The second test component includes a second gas transmission pipeline, at least one second test pipeline, and at least one second valve seat; One end of the second gas transmission pipeline is connected to the third output port, and the other end is in a closed state; One end of the second test pipeline is connected to the second gas transmission pipeline, and the other end is connected to the second valve seat; The second valve seat is used to install a safety valve or a PV valve, and valves are provided on the second gas transmission pipeline and the second test pipeline.

4. The safety valve and PV valve test device according to claim 3, characterized in that: The second test component further includes a second operating platform, and the second operating platform is arranged close to the second valve seat.

5. The safety valve and PV valve test device according to claim 3, characterized in that: The second test component further includes a second sealing cover plate, and the second sealing cover plate matches the second valve seat.

6. The safety valve and PV valve test device according to claim 4, characterized in that: The second test component further includes a second sealing gasket, and the second sealing gasket is arranged between the second sealing cover plate and the second valve seat.

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