Test device and test method for multiple pressure test loops

Abstract

The invention discloses a test device and test method for multiple pressure test loops, the test device comprises a conversion piece, the conversion piece is provided with two first interfaces, a plurality of second interfaces and a plurality of third interfaces, and the conversion piece is internally provided with channels which are communicated with one another among the first interfaces, the second interfaces and the third interfaces; the first interface is used for introducing test liquid, the second interface is used for communicating with the input ends of the pressure test loops, and the input ends of the plurality of pressure test loops are connected to the second interface, so that the plurality of pressure test loops can be tested at the same time through the intercommunication of the internal channels of the conversion piece under the condition of ensuring the pressure test effect and the pressure test safety; two driving parts are arranged to fill the pressure test loop with the test liquid, one driving part is used for filling the liquid, the other driving part is used for carrying out the pressure test, and the centrifugal pump is started, so that the filling period is shortened, the test efficiency is greatly improved, the field installation requirement is met under the condition that the construction safety is guaranteed, the construction efficiency is improved, the construction period is shortened, and the cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of pipeline pressure testing, and particularly to a test device and test method for multiple pressure test circuits. Background Art

[0002] Polyolefin products are important basic chemical raw materials, and the output of polyolefins is also one of the important indicators to measure the development level of a country's petrochemical industry. Currently, a large number of polyolefin plants are under construction or about to start construction. As one of the main plants, the process package, detailed design, equipment and components of the core ultra-high pressure part of the LDPE / EVA plant all adopt foreign technologies and products. The construction of the entire ultra-high pressure system is the key line of the entire plant, and the speed of its progress directly determines whether the plant can start up in advance and create efficiency in advance.

[0003] The ultra-high pressure pipeline system of the LDPE / EVA plant includes four pressure grade systems of PN4000, PN3600, PN1600, and PN500. Among them, the PN3600 and PN1600 systems are flange-connected, and high-pressure lens gaskets are used as gaskets. After installation, tightness tests are carried out, and the maximum test pressure is 330 MPa; the PN500 system adopts two connection methods of flange pairs and welding. After the system is installed, strength tests need to be carried out, and the maximum test pressure is 75 MPa. The relevant design specifications and construction specifications are limited to a design pressure range of 42 MPa and below, and their test pressures far exceed the scope of the relevant technical specifications. At the same time, there are multiple ultra-high pressure devices connected to the pipeline system, and there are many control valves in the ultra-high pressure system, which cannot participate in the tightness and strength tests of the pipeline during the test. Therefore, the entire ultra-high pressure system needs to be decomposed into many circuits for separate tests. Each pressure test package requires at least 6 hours from the filling of the test liquid, starting to boost the pressure, ending the pressure test to recovering the test liquid. It takes about 2 months to complete the test of the entire ultra-high pressure system, and the test cycle is relatively long. Summary of the Invention

[0004] Aiming at the defects existing in the prior art, this application provides a test device and test method for multiple pressure test circuits to solve the problem of cumbersome and difficult detection of multiple pressure test circuits in the prior art.

[0005] The above object of this application is mainly achieved through the following technical solutions:

[0006] A test device for multiple pressure test circuits, the test device includes:

[0007] A conversion piece, on which there are two first interfaces, multiple second interfaces and multiple third interfaces. There are channels inside the conversion piece that are interconnected among the first interface, the second interface and the third interface. The first interface is used to introduce a test liquid, and the second interface is used to connect to the input end of a pressure test circuit;

[0008] Control pieces, there are multiple control pieces, which are respectively and communicatively arranged on the first interface, the second interface and the third interface to be used for switching the conduction states at the first interface, the second interface and the third interface;

[0009] Drive pieces, there are two drive pieces, which are respectively and communicatively arranged on the two first interfaces to be used for driving the test liquid into the channel;

[0010] A first pressure part, which is communicatively arranged on one of the third interfaces to be used for obtaining the pressure value in the channel;

[0011] Sealing pieces, there are multiple sealing pieces, which are detachably blocked on the first interface, the second interface or the third interface.

[0012] In an alternative embodiment, there are two second interfaces. The control pieces include a first valve body, a second valve body, a third valve body and a fourth valve body. The first valve body and the second valve body are respectively connected to the two first interfaces, the third valve body and the fourth valve body are respectively connected to the two second interfaces, and there is a fifth valve body between the first pressure part and the third interface.

[0013] In an alternative embodiment, the drive pieces include a first pump body and a second pump body. The first pump body is communicatively connected to one end of the first valve body away from the conversion piece, and the second pump body is communicatively connected to one end of the second valve body away from the conversion piece.

[0014] In an alternative embodiment, there is a pressure relief interface on one conversion piece to be used for discharging the test liquid, and there is a sixth valve body on the pressure relief interface.

[0015] In an alternative embodiment, the test device for the multiple pressure test circuits further includes a second pressure part for connecting to the output end of the pressure test circuit.

[0016] In an alternative embodiment, there is also a seventh valve body between the output end of the pressure test circuit and the second pressure part.

[0017] In an alternative embodiment, there is also a return branch between the output end of the pressure test circuit and the second pressure part.

[0018] Based on the same inventive concept, the present application also provides a test method for a multi-pressure test circuit. The test method is carried out by using the test device as described above, and the test method includes:

[0019] Connect the input ends of the pressure test circuits to the second interface respectively;

[0020] Close the first valve body and the sixth valve body, open the third valve body and the fourth valve body, start the second pump body, and fill the pressure test circuit with the test liquid;

[0021] Close the second valve body, stop the second pump body, open the first valve body, start the first pump body to boost the pressure of the pressure test circuit, then stop the first pump body, close the first valve body. After detecting the leakage point of the pressure test circuit, open the sixth valve body and deal with the leakage point;

[0022] Start the first pump body to boost the pressure of the pressure test circuit in multiple stages. After each stage of pressure boost, compare the pressure value at the second pressure part. When the pressure value at the second pressure part drops, check and deal with the leakage point of the pressure test circuit;

[0023] When the pressure value at the second pressure part is stable, the pressure test is qualified, and open the sixth valve body to release the pressure multiple times until the pressure drops to 0;

[0024] Purge, clean and recover the test liquid.

[0025] In an optional embodiment, when starting the first pump body to boost the pressure of the pressure test circuit, repeat the operation at least twice. And each time when boosting the pressure of the pressure test circuit by the first pump body, when the pressure at the first pressure part reaches 10 MPa, stop boosting the pressure.

[0026] In an optional embodiment, when carrying out multi-stage pressure boost, boost the pressure by 50 MPa in each stage and keep the pressure for 30 minutes.

[0027] Compared with the prior art, the advantages of the present application are:

[0028] The test device in this application is provided with a conversion component. The conversion component is provided with two first interfaces, multiple second interfaces, and multiple third interfaces. Inside the conversion component, there are channels that communicate with each other among the first interface, the second interface, and the third interface. The first interface is used to introduce the test liquid. The second interface is used to connect to the input end of the pressure test circuit. Multiple control components are respectively connected and provided on the first interface, the second interface, and the third interface to switch the conduction states at the first interface, the second interface, and the third interface. Two driving components are respectively connected and provided on the two first interfaces to drive the test liquid into the channels of the conversion component. A first pressure part is connected and provided on one of the third interfaces to obtain the pressure value inside the channel. Multiple plugging components are detachably plugged on the first interface, the second interface, or the third interface to keep the conversion component in a relatively sealed test state when facing different pressure test circuits. When detecting the pressure test circuit, connect the input ends of multiple pressure test circuits to the second interface. Under the condition of ensuring the pressure test effect and pressure test safety, through the interconnection of the internal channels of the conversion component, multiple pressure test circuits can be tested simultaneously. Two driving components are set to fill the test liquid for the pressure test circuit. One driving component is used for liquid filling, and one driving component is used for the pressure experiment. Start the centrifugal pump to shorten the filling cycle, greatly improve the test efficiency, meet the on-site installation requirements under the condition of ensuring construction safety, improve the construction efficiency, shorten the construction cycle, and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is the schematic diagram of the operation of the test device provided by the embodiment of this application;

[0031] In the figure: 100, conversion component; 101, first interface; 102, second interface; 103, third interface; 104, channel; 105, pressure relief interface; 201, first valve body; 202, second valve body; 203, third valve body; 204, fourth valve body; 205, fifth valve body; 206, sixth valve body; 207, seventh valve body; 301, first pump body; 302, second pump body; 401, first pressure part; 402, second pressure part; 501, plugging component; 502, pressure test circuit; 503, return branch. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not limit the present invention. The specific structural and functional details disclosed herein are only used to describe the exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms and should not be construed as limited to the embodiments set forth herein.

[0033] Figure 1 This is a schematic diagram of the operation of the test device provided by the embodiments of this application.

[0034] As Figure 1 shown, a test device with multiple pressure test circuits 502, the test device includes a conversion member 100, a control member, a driving member, a first pressure part 401, and a plugging member 501, wherein:

[0035] The conversion member 100 is provided with two first interfaces 101, multiple second interfaces 102, and multiple third interfaces 103. A channel 104 is provided inside the conversion member 100 and is interconnected between the first interface 101, the second interface 102, and the third interface 103. The first interface 101 is used to introduce the test liquid, and the second interface 102 is used to connect to the input end of the pressure test circuit 502. It should be noted that according to the number of pressure test circuits 502 to be tested simultaneously, the corresponding number of second interfaces 102 are connected. When some of the second interfaces 102 are not connected to the pressure test circuit 502, they can be selectively plugged by the plugging member 501 to maintain the reliability of the conversion member 100.

[0036] As Figure 1 shown, multiple control members are provided and are respectively and communicatively provided on the first interface 101, the second interface 102, and the third interface 103 to be used for switching the conduction states at the first interface 101, the second interface 102, and the third interface 103. The control member can adopt a cut-off valve. Through control operations, the conduction state at this place is switched through this control member, and then the test liquid in the channel 104 is controlled.

[0037] As Figure 1 shown, two driving members are provided and are respectively and communicatively provided on the two first interfaces 101 to be used for driving the test liquid into the channel 104.

[0038] The first pressure part 401 is communicatively provided on one of the third interfaces 103 to be used for obtaining the pressure value in the channel 104. The first pressure part 401 can be configured with a pressure gauge and can indicate the current pressure value in real time.

[0039] As Figure 1As shown in the figure, a plurality of plugging members 501 are provided and are detachably plugged on the first interface 101, the second interface 102 or the third interface 103. The plugging members 501 perform plugging operations flexibly. When facing different systems to be tested, they can more flexibly match the pressure test circuit 502, improving applicability and reliability.

[0040] In an alternative embodiment, the working principle of the test device in the present application is as follows: By providing a conversion member 100, the conversion member 100 is provided with two first interfaces 101, a plurality of second interfaces 102 and a plurality of third interfaces 103. A channel 104 is provided inside the conversion member 100 and is interconnected between the first interface 101, the second interface 102 and the third interface 103. The first interface 101 is used to introduce the test liquid. The second interface 102 is used to connect to the input end of the pressure test circuit 502. A plurality of control members are respectively connected and provided on the first interface 101, the second interface 102 and the third interface 103 to switch the conduction states at the first interface 101, the second interface 102 and the third interface 103. Two driving members are respectively connected and provided on the two first interfaces 101 to drive the test liquid into the channel 104 of the conversion member 100. A first pressure part 401 is connected and provided on one of the third interfaces 103 to obtain the pressure value in the channel 104. A plurality of plugging members 501 are detachably plugged on the first interface 101, the second interface 102 or the third interface 103 to keep the conversion member 100 in a relatively sealed test state when facing different pressure test circuits 502. When detecting the pressure test circuit 502, the input ends of a plurality of pressure test circuits 502 are connected to the second interface 102. Under the condition of ensuring the pressure test effect and pressure test safety, through the intercommunication of the internal channel 104 of the conversion member 100, a plurality of pressure test circuits 502 can perform tests simultaneously. Two driving members are provided to fill the pressure test circuit 502 with the test liquid. One driving member is for liquid filling and one driving member is for pressure experiment. Start the centrifugal pump to shorten the filling cycle, greatly improve the test efficiency, meet the on-site installation requirements under the condition of ensuring construction safety, improve the construction efficiency, shorten the construction cycle and reduce the cost.

[0041] As Figure 1 shown, in an alternative embodiment, two second interfaces 102 are provided. The control members include a first valve body 201, a second valve body 202, a third valve body 203 and a fourth valve body 204. The first valve body 201 and the second valve body 202 are respectively connected to the two first interfaces 101. The third valve body 203 and the fourth valve body 204 are respectively connected to the two second interfaces 102. A fifth valve body 205 is provided between the first pressure part 401 and the third interface 103.

[0042] By controlling the first valve body 201 and the second valve body 202, the conduction state at the first interface 101 can be switched. By controlling the third valve body 203 and the fourth valve body 204, the conduction state at the second interface 102 can be switched. By controlling the fifth valve body 205, the conduction state between the third interface 103 and the first pressure part 401 can be switched.

[0043] As Figure 1 shown, it should be noted that, for the convenience of description, two second interfaces 102 are provided here to be applicable to one or two pressure test circuits 502 for testing, and it is also possible to handle the setting of multiple second interfaces 102, and correspondingly, multiple pressure test circuits 502 can be detected.

[0044] As Figure 1 shown, in an alternative embodiment, the driving member includes a first pump body 301 and a second pump body 302. The first pump body 301 is connected and communicated at one end of the first valve body 201 away from the conversion member 100, and the second pump body 302 is connected and communicated at one end of the second valve body 202 away from the conversion member 100. The first pump body 301 and the second pump body 302 are respectively used to drive the test liquid into the channel 104 of the conversion member 100.

[0045] As Figure 1 shown, in an alternative embodiment, a pressure relief interface 105 is provided on one conversion member 100 for discharging the test liquid, and a sixth valve body 206 is provided on the pressure relief interface 105 to facilitate emergency pressure relief and cleaning and discharging of the test liquid.

[0046] As Figure 1 shown, in an alternative embodiment, the test device for the multiple pressure test circuits 502 further includes a second pressure part 402 for connecting and communicating the output ends of the pressure test circuits 502, and the pressure value is obtained at the output ends of the pressure test circuits 502.

[0047] As Figure 1 shown, in an alternative embodiment, a seventh valve body 207 is further provided between the output end of the pressure test circuit 502 and the second pressure part 402 to facilitate more precise control of the test liquid.

[0048] In an alternative embodiment, a return branch 503 is further provided between the output end of the pressure test circuit 502 and the second pressure part 402, and the test liquid at the output end of the pressure test circuit 502 can directly pass through the return branch 503 and be collected.

[0049] As Figure 1 shown, based on the same inventive concept, the present application further provides a test method for multiple pressure test circuits 502. The test method is carried out by using the test device as described above, and the test method includes:

[0050] Connect the input ends of the pressure test circuit 502 to the second interface 102 respectively;

[0051] Close the first valve body 201 and the sixth valve body 206, open the third valve body 203 and the fourth valve body 204, start the second pump body 302, and fill the pressure test circuit 502 with the test liquid;

[0052] Close the second valve body 202, stop the second pump body 302, open the first valve body 201, start the first pump body 301 to boost the pressure of the pressure test circuit 502, then stop the first pump body 301, close the first valve body 201, after detecting the leakage point of the pressure test circuit 502, open the sixth valve body 206, and deal with the leakage point;

[0053] Start the first pump body 301 to boost the pressure of the pressure test circuit 502 in multiple stages. After boosting the pressure in each stage, compare the pressure value at the second pressure part 402. When the pressure value at the second pressure part 402 drops, check and deal with the leakage point of the pressure test circuit 502;

[0054] When the pressure value at the second pressure part 402 is stable, the pressure test is qualified, and open the sixth valve body 206 to release the pressure multiple times until the pressure drops to 0;

[0055] Purge, clean and recover the test liquid.

[0056] In an alternative embodiment, when starting the first pump body 301 to boost the pressure of the pressure test circuit 502, repeat the operation at least twice, and each time when boosting the pressure of the pressure test circuit 502 by the first pump body 301, stop boosting when the pressure at the first pressure part 401 reaches 10 MPa.

[0057] In an alternative embodiment, when performing multi-stage pressure boosting, boost the pressure by 50 MPa in each stage and hold the pressure for 30 minutes.

[0058] When actually operating using the above test method, perform the following steps:

[0059] Connect the input ends of the pressure test circuit 502 to the second interface 102 respectively;

[0060] Close the first valve body 201 and the sixth valve body 206, open the third valve body 203 and the fourth valve body 204, start the second pump body 302, and fill the pressure test circuit 502 with the test liquid;

[0061] Close the second valve body 202, stop the second pump body 302, open the first valve body 201, start the first pump body 301 to boost the pressure of the pressure test circuit 502. When the pressure at the first pressure part 401 reaches 10 MPa, stop the first pump body 301, stop boosting the pressure, close the first valve body 201. After detecting the leakage point of the pressure test circuit 502, open the sixth valve body 206 and deal with the leakage point;

[0062] Perform the operation again: close the second valve body 202, stop the second pump body 302, open the first valve body 201, start the first pump body 301 to boost the pressure of the pressure test circuit 502. When the pressure at the first pressure part 401 reaches 10 MPa, stop the first pump body 301, stop boosting the pressure, close the first valve body 201 until no leakage point is detected on the pressure test circuit 502;

[0063] Start the first pump body 301 to perform multi-stage pressure boosting on the pressure test circuit 502, with a pressure boost of 50 MPa for each stage and a pressure holding time of 30 minutes. Compare the pressure values at the second pressure part 402. When the pressure value at the second pressure part 402 drops, check and deal with the leakage point of the pressure test circuit 502, and then continue to start the first pump body 301 to perform multi-stage pressure boosting on the pressure test circuit 502, with a pressure boost of 50 MPa for each stage and a pressure holding time of 30 minutes. Compare the pressure values at the second pressure part 402. If the pressure value at the second pressure part 402 drops, check and deal with the leakage point of the pressure test circuit 502 again;

[0064] If the pressure value at the second pressure part 402 does not drop during the stage pressure boosting process, the pressure test is qualified, and open the sixth valve body 206 to perform multiple pressure relieves until the pressure drops to 0;

[0065] Purge, clean and recover the test liquid.

[0066] It should be understood that the terms first, second, etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. Although the terms first, second, etc. may be used in this article to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit can be called the second unit, and similarly, the second unit can be called the first unit, without departing from the scope of the exemplary embodiments of the present invention.

[0067] It should be understood that the term "and / or" in this text is merely a description of the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, B exists alone, or both A and B exist simultaneously. The term " / and" in this text describes another relationship between associated objects, indicating that there can be two relationships. For example, A / and B can represent two situations: A exists alone, or both A and B exist. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0068] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "upper", "vertical", "inner", "outer", etc. is the orientation or positional relationship in which the disclosed product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is 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 therefore should not be construed as a limitation on the present invention.

[0069] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0070] The terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise", "comprises", "include", and / or "includes" when used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, and do not preclude the presence or addition of one or more other features, quantities, steps, operations, units, components, and / or their combinations.

[0071] Specific details are provided in the following description to facilitate a complete understanding of the exemplary embodiments. However, those of ordinary skill in the art should understand that the exemplary embodiments can be implemented without these specific details. In other embodiments, well-known processes, structures, and technologies may not be shown in unnecessary detail to avoid obscuring the exemplary embodiments.

[0072] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features claimed herein.

[0073] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art.

Claims

1. A test device with multiple pressure test circuits, characterized in that The test device includes: a conversion member, on which there are two first interfaces, multiple second interfaces, and multiple third interfaces. There are channels inside the conversion member that are interconnected among the first interface, the second interface, and the third interface. The first interface is used to introduce the test liquid, and the second interface is used to connect to the input end of the pressure test circuit; control members, there are multiple control members, which are respectively and communicatively arranged on the first interface, the second interface, and the third interface to be used for switching the conduction states at the first interface, the second interface, and the third interface; driving members, there are two driving members, which are respectively and communicatively arranged on the two first interfaces to be used for driving the test liquid into the channels; a first pressure part, which is communicatively arranged on one of the third interfaces to be used for obtaining the pressure value in the channel; sealing members, there are multiple sealing members, which are detachably blocked on the first interface, the second interface, or the third interface.

2. The test device for multiple pressure test circuits according to claim 1, characterized in that: There are two second interfaces. The control members include a first valve body, a second valve body, a third valve body, and a fourth valve body. The first valve body and the second valve body are respectively connected to the two first interfaces, the third valve body and the fourth valve body are respectively connected to the two second interfaces, and there is a fifth valve body between the first pressure part and the third interface.

3. The test device for multiple pressure test circuits according to claim 2, characterized in that: The driving members include a first pump body and a second pump body. The first pump body is communicatively arranged at one end of the first valve body away from the conversion member, and the second pump body is communicatively arranged at one end of the second valve body away from the conversion member.

4. The test device for a multi-pressure test circuit according to claim 3, characterized in that: There is a pressure relief interface on one of the conversion members to be used for discharging the test liquid, and there is a sixth valve body on the pressure relief interface.

5. The test device for a multi-pressure test circuit according to claim 4, characterized in that: The test device for the multi-pressure test circuit further includes a second pressure part for connecting to the output end of the pressure test circuit.

6. The test device for a multi-pressure test circuit according to claim 5, characterized in that: There is also a seventh valve body between the output end of the pressure test circuit and the second pressure part.

7. The test device for a multi-pressure test circuit according to claim 6, characterized in that: There is also a return branch between the output end of the pressure test circuit and the second pressure part.

8. A test method for a multi-pressure test circuit, characterized in that: The test method is carried out by using the test device according to any one of claims 5-7. The test method includes: respectively connecting the input ends of the pressure test circuit to the second interfaces; closing the first valve body and the sixth valve body, opening the third valve body and the fourth valve body, and starting the second pump body to fill the pressure test circuit with the test liquid; closing the second valve body, stopping the second pump body, opening the first valve body, starting the first pump body to boost the pressure of the pressure test circuit, then stopping the first pump body, closing the first valve body, after detecting the leakage point of the pressure test circuit, opening the sixth valve body, and dealing with the leakage point; starting the first pump body to boost the pressure of the pressure test circuit in multiple stages. After each stage of pressure boost, compare the pressure value at the second pressure part. When the pressure value at the second pressure part drops, check and deal with the leakage point of the pressure test circuit; when the pressure value at the second pressure part is stable, the pressure test is qualified, and open the sixth valve body to carry out multiple pressure reliefs until the pressure drops to 0; purge, clean, and recover the test liquid.

9. The test method for the multi-pressure test circuit according to claim 8, characterized in that: When starting the first pump body to boost the pressure of the pressure test circuit, repeat the operation at least twice. And each time when boosting the pressure of the pressure test circuit through the first pump body, when the pressure at the first pressure part reaches 10 MPa, stop boosting the pressure.

10. The test method for the multi-pressure test circuit according to claim 8, characterized in that: When performing multi-stage pressure boosting, boost the pressure by 50 MPa for each stage and hold the pressure for 30 minutes.

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