A valve test system and a valve test method

Abstract

The present invention provides a valve test system and test method, including a test section, a first test loop and a second test loop, the tested valve is connected to the test section, the first test loop and the second test loop are respectively connected in parallel with the test section, and the flow direction of the medium in the first test loop and the second test loop is opposite; the first test loop includes a first main pump valve V1 and a valve V7, and a valve V12 is connected in parallel at both ends of the first main pump; the second test loop includes a second main pump valve V10 and a valve V13, and a valve V11 is connected in parallel at both ends of the second main pump, and valves V1 and V7 are interlocked with valves V10 and V13; and also includes a pressure regulating loop connected in parallel with the test section, and a valve V8 is connected in series in the pressure regulating loop. The present invention can effectively improve the service life of the pump, realize the opening and closing of the main pump instead of the opening and closing of the accompanying test valve, and realize the linear control of the closing pressure difference of the tested valve, can simulate the transient pressure difference of closing the valve, and the experimental results are relatively accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of valve testing, and in particular to a valve testing system and a testing method. Background Art

[0002] When conducting full-flow opening and closing tests on large-diameter valves, due to the capacity limitations of the main pump, the test valve is usually installed on the main circuit, and the main pump on the main circuit is started and stopped to simulate the opening / closing of the check valve. This type of method has the following problems: 1) It cannot simulate the transient pressure difference when closing the valve, resulting in a certain deviation in the test results; 2) The test cost and cycle have great uncertainty. The check valve test is generally more than 2000 times, which makes the accompanying main pump more susceptible to damage.

[0003] Therefore, there is an urgent need for a valve testing system and a testing method that can produce more accurate test results and prevent the main pump from being damaged. Summary of the invention

[0004] The main purpose of the present invention is to provide a valve testing system and a testing method with more accurate test results and less prone to damage to the main pump under test.

[0005] To achieve the above object, the technical solution of the present invention is implemented as follows: a valve test system, comprising a test section, a first test loop and a second test loop, a test valve to be tested is connected to the test section, the first test loop and the second test loop are respectively connected in parallel with the test section, and are respectively used to provide a test medium to the test section, and the flow directions of the medium in the first test loop and the second test loop through the test section are opposite;

[0006] The first test circuit includes a first main pump, and two ends of the first main pump connected in parallel with the test section are respectively provided with valves V1 and valve V7, and also includes a valve V12 connected in parallel with two ends of the first main pump;

[0007] The second test circuit includes a second main pump, and the two ends of the second main pump connected in parallel with the test section are respectively provided with valves V10 and valve V13, and also includes a valve V11 connected in parallel with the two ends of the second main pump, and the valves V1 and V7 are interlocked with the valves V10 and V13. When the valves V1 and V7 are opened, the valves V10 and V13 are closed, and when the valves V10 and V13 are opened, the valves V1 and V7 are closed;

[0008] It also includes a pressure regulating circuit connected in parallel with the test section, in which a valve V8 is connected in series.

[0009] Furthermore, the calibers of the valves V1, V7, V10 and V13 are greater than or equal to the caliber of the tested valve.

[0010] Furthermore, the flow direction of the medium in the first test loop is defined as the forward direction, and the flow direction of the medium in the second test loop is defined as the reverse direction. With reverse flow The density of the medium is affected by the following function:

[0011]

[0012] in: is the density of the fluid in the first test circuit; is the density of the fluid in the second test loop; the forward flow rate It is the flow rate of the test section when the first test circuit is connected to the test section; the reverse flow rate It is the flow rate of the test section when the second test circuit is connected to the test section.

[0013] Furthermore, the flow direction of the medium in the first test loop is defined as the forward direction, and the flow direction of the medium in the second test loop is defined as the reverse direction. , Positive pressure difference The lift between the first main pump must meet the following requirements:

[0014]

[0015] Reverse flow rate , Reverse pressure difference The lift between the main pump and the second main pump must meet the following requirements:

[0016]

[0017] in: are the fully open flow resistance coefficients of valve V7, valve V1, valve V10 and valve V13 respectively; is the head of the first main pump; is the head of the second main pump; positive pressure difference It is the pressure difference at both ends of the test section when the first test circuit is connected to the test section; reverse pressure difference is the pressure difference at both ends of the test section when the second test circuit is connected to the test section; forward flow rate It is the flow rate of the test section when the first test circuit is connected to the test section; the reverse flow rate is the flow rate of the test section when the second test circuit is connected to the test section; is the density of the fluid in the first test circuit; is the density of the fluid in the second test loop.

[0018] Furthermore, a first pressure gauge and a first flow meter are provided on the branch where the first main pump is located, a second pressure gauge and a second flow meter are provided on the branch where the second main pump is located, and a third pressure gauge and a third flow meter are provided on the test section; a fourth pressure gauge and a fourth flow meter are provided on the branch where the valve V1 is located; a fifth pressure gauge and a fifth flow meter are provided on the branch where the valve V8 is located; and a sixth pressure gauge and a sixth flow meter are provided on the branch where the valve V13 is located.

[0019] Furthermore, a valve V4 is provided at one end of the second test circuit connected to the test section. When the second test circuit is working, the medium flowing through the valve V8 and the test section flows back to the second main pump through the valve V4.

[0020] Furthermore, when debugging the second test loop after adjusting the first test loop, the opening of the valve V8 remains unchanged, and the openings of the valves V4 and V11 are adjusted in opposite directions.

[0021] Furthermore, the opening of the valve V4 Use the following formula for quick calculation:

[0022]

[0023]

[0024]

[0025] Where: is the resistance opening curve of valve V4; is the resistance opening curve of valve V8; is the valve V8 opening; is the head of the second main pump; is the medium density of the second test circuit; is the indication of the sixth flow meter; , is the fully open flow resistance coefficient of valve V6, valve V10 and valve V8, Reverse flow rate.

[0026] Furthermore, in the first test loop, a first heater is connected in parallel at both ends of the first main pump, and a valve V2 is connected in series on the branch where the first heater is located; in the second test loop, a second heater is connected in parallel at both ends of the second main pump, and a valve V6 is connected in series on the branch where the second heater is located.

[0027] Furthermore, in the first test loop, a first cooler is connected in parallel at both ends of the first main pump, and a valve V5 is connected in series on the branch where the first heater is located; in the second test loop, a second cooler is connected in parallel at both ends of the second main pump, and a valve V3 is connected in series on the branch where the second heater is located.

[0028] A valve testing method, using the above valve testing system, the valve testing method includes an opening and closing test of the valve, the steps of which are as follows:

[0029] S1. Debug the first test circuit, fully open valves V7 and V1, open valves V8 and V12, close the other valves, adjust the opening of valve V8 so that the pressure at both ends of valve V8 is the test pressure of the tested valve, and adjust the opening of valve V12 so that the first main pump is in rated working condition;

[0030] S2. Debug the second test circuit, fully open valves V10 and V13, keep the opening of valve V8 unchanged, open valves V4 and V11, and close the other valves. Adjust the opening of valve V4 so that the pressure at both ends of valve V8 is the test pressure of the tested valve, and adjust the opening of valve V11 so that the second main pump is in rated working condition;

[0031] S3. Open and close valve V1 and valve V7 at the same time, or open and close valve V10 and valve V13 at the same time, to realize the opening and closing test of the valve.

[0032] Furthermore, a high and low temperature test is also included, and the high and low temperature test includes a temperature adjustment step arranged before step S3:

[0033] Open valves V2 and V6, or valves V5 and V3, and adjust the openings of valves V12 and V11 to keep the first main pump and the second main pump at rated operating conditions. Adjust the temperature of the medium in the first test loop and the second test loop through the corresponding cooler or heater.

[0034] Furthermore, a high and low temperature cycle test is also included, and the high and low temperature cycle test includes a temperature rise and fall step arranged before step S3:

[0035] Open valve V2 or valve V5 in the first test loop to increase or decrease the temperature of the first test loop;

[0036] Open valve V3 or valve V6 in the second test circuit to cool down or heat up the second test circuit; wherein, one of the first test circuit and the second test circuit is required to have a higher temperature and the other one to have a lower temperature;

[0037] Adjust the opening of valve V12 and valve V11 to make the first main pump and the second main pump in rated working condition.

[0038] The beneficial effects of the present invention are embodied in:

[0039] In the present invention, the arrangement of valves V12 and V11 can prevent the pump from being damaged when the tested valve is closed, thereby effectively improving the service life of the pump. Meanwhile, the arrangement of valve V8 can adjust the test pressure of the test section, and can adapt to various valves for testing. By making the first test loop and the second test loop flow in opposite directions through the test section, the present application can perform an opening and closing test on the check valve. Meanwhile, the dual-loop design can replace the opening and closing of the main pump with the opening and closing of the companion test valve, and realize linear control of the closing pressure difference of the tested valve, thereby simulating the transient pressure difference when the valve is closed, and the experimental results are relatively accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In the attached picture:

[0041] Figure 1 The schematic diagram of the valve test system described in the present invention (excluding the cooler and heater);

[0042] Figure 2 The schematic diagram of the valve test system described in the present invention (including a cooler and a heater).

[0043] Description of reference numerals:

[0044] 1. First test circuit; 2. Second test circuit. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the invention.

[0046] See also Figure 1 , Figure 2 .

[0047] The present invention discloses a valve test system, comprising a test section, a first test loop 1 and a second test loop, wherein a test valve to be tested is connected to the test section, the first test loop 1 and the second test loop are respectively connected in parallel with the test section and are respectively used to provide a test medium to the test section, and the flow directions of the medium in the first test loop 1 and the second test loop through the test section are opposite;

[0048] The first test circuit 1 includes a first main pump, and two ends of the first main pump connected in parallel with the test section are respectively provided with valves V1 and valve V7, and also includes a valve V12 connected in parallel with the two ends of the first main pump;

[0049] The second test circuit includes a second main pump, and the two ends of the second main pump connected in parallel with the test section are respectively provided with valves V10 and valve V13, and also includes a valve V11 connected in parallel with the two ends of the second main pump, and the valve V1 and valve V7 are interlocked with the valve V10 and valve V13. When the valve V1 and valve V7 are opened, the valve V10 and valve V13 are closed, and when the valve V10 and valve V13 are opened, the valve V1 and valve V7 are closed;

[0050] It also includes a pressure regulating circuit connected in parallel with the test section, in which a valve V8 is connected in series.

[0051] In specific implementation, the test valves mentioned in this application include various valves, such as active valves (referring to a type of valve that can be controlled by other means, such as valves that can be opened and closed manually, electrically, pneumatically, etc.), check valves, stop valves, etc. During operation, taking the check valve (which only allows the fluid to flow in a specified direction, and the valve is closed for reverse flow) as an example, valves V1 and V7 are opened, valves V10 and V13 are closed, and the first main pump and the second main pump are turned on. Since the pressure regulating circuit is connected in parallel with the test section, the pressure at both ends of the test section is equal to the pressure at both ends of the pressure regulating circuit. Therefore, the pressure at both ends of the test section can be adjusted by adjusting the opening of valve V8; by adjusting the opening of valve V8, the pressure at both ends of the test section is made to be the experimental pressure of the valve under test, and then valve V8 remains unchanged, and then valve V12 is adjusted to connect the first test circuit 1 During the test section, the first main pump is in rated working condition; then adjust valve V11 so that the second main pump is in rated working condition when the second test loop is connected to the test section, and then connect the tested valve to the test section to start the experiment. During the experiment, it is only necessary to open and close valves V1 and V7 at the same time, and open and close valves V10 and V13 at the same time to realize the opening and closing test of the tested valve, and during the experiment, the two pumps will not be blocked, and the service life of the two pumps will be longer (since the first test loop 1 and the second test loop flow through the test section in opposite directions, opening and closing valves V1 and V7 can change the opening and closing state of the check valve);

[0052] If the valve under test is an active valve, any one of the first test circuit 1 and the second test circuit can be connected to the test section, and then the valve under test can be controlled to open and close, thereby realizing the opening and closing test of the valve under test.

[0053] In the present invention, the arrangement of valves V12 and V11 can prevent the pump from being damaged when the tested valve is closed, thereby effectively improving the service life of the pump. Meanwhile, the arrangement of valve V8 can adjust the test pressure of the test section, and can adapt to various valves for testing, and can perform high-pressure full-flow tests on various valves. By making the first test loop 1 and the second test loop flow in opposite directions through the test section, the present application can perform an opening and closing test on the check valve. Meanwhile, the design of the dual loops can replace the opening and closing of the main pump with the opening and closing of the companion test valve, and realize linear control of the closing pressure difference of the tested valve, so that the experimental results are more accurate.

[0054] In one embodiment, the diameters of the valves V1, V7, V10 and V13 are greater than or equal to the diameter of the valve to be tested. With this design, the full flow test of the valve to be tested can be performed.

[0055] In one embodiment, the flow direction of the medium in the first test loop 1 is defined as the forward direction, and the flow direction of the medium in the second test loop is defined as the reverse direction. The forward flow rate and the reverse flow rate are affected by the medium density and obey the following function:

[0056]

[0057] in: is the density of the fluid in the first test circuit;

[0058] is the density of the fluid in the second test circuit;

[0059] Forward flow rate is the flow rate of the test section when the first test circuit is connected to the test section;

[0060] Reverse flow rate It is the flow rate of the test section when the second test circuit is connected to the test section.

[0061] In specific implementation, since the technical solution of the present application is applied in nuclear power, its operating conditions are relatively complex. The different temperatures and media in the two circuits will cause changes in the density of the medium, resulting in deviations in the experiment. Therefore, the above function can improve the accuracy of the test results and reduce the occurrence of errors.

[0062] In one embodiment, the flow direction of the first test loop 1 is defined as the forward direction, and the flow direction of the second test loop is defined as the reverse direction. , Positive pressure difference The lift between the first main pump must meet the following requirements:

[0063]

[0064] Reverse flow rate , Reverse pressure difference The lift between the main pump and the second main pump must meet the following requirements:

[0065]

[0066] in: are the fully open flow resistance coefficients of valve V7, valve V1, valve V10 and valve V13 respectively;

[0067] is the head of the first main pump;

[0068] is the head of the second main pump;

[0069] Positive pressure difference It is the pressure difference at both ends of the test section when the first test circuit is connected to the test section;

[0070] Reverse pressure difference It is the pressure difference at both ends of the test section when the second test circuit is connected to the test section;

[0071] is the density of the fluid in the first test circuit;

[0072] is the density of the fluid in the second test loop.

[0073] With this design, only the pump that meets the above requirements can be used to test the full flow rate of the valve under test, thus providing conditions for the full flow rate test of the valve under test.

[0074] In one embodiment, a first pressure gauge and a first flow meter are provided on the branch where the first main pump is located, a second pressure gauge and a second flow meter are provided on the branch where the second main pump is located, and a third pressure gauge and a third flow meter are provided on the test section; a fourth pressure gauge and a fourth flow meter are provided on the branch where the valve V1 is located; a fifth pressure gauge and a fifth flow meter are provided on the branch where the valve V8 is located; and a sixth pressure gauge and a sixth flow meter are provided on the branch where the valve V13 is located.

[0075] In the specific implementation, the pressure and flow at each position are monitored by various pressure gauges and flow meters, and then the experimental system is regulated. The positive pressure difference can be obtained through the fifth flow meter. It can be obtained by observing the fifth pressure gauge and the third pressure gauge, and it can be known by observing the first pressure gauge and the first flow meter, the second pressure gauge and the second flow meter whether the first main pump and the second main pump are in rated working conditions.

[0076] In one embodiment, a valve V4 is provided at one end of the second test circuit connected to the test section. When the second test circuit is working, the medium flowing through the valve V8 and the test section flows back to the second main pump through the valve V4. With this design, since the first main pump and the second main pump cannot be completely guaranteed to be consistent, and since valve V8 cannot be adjusted (the opening of valve V8 should remain unchanged after the first test loop 1 is debugged), the pressure at both ends of valve V8 in the second test loop can be changed by adjusting the opening of valve V4. It should be pointed out that although this can be achieved only by valve V11, since the valve itself has a hysteresis, if valve V11 is relied on alone, valve V11 needs to have a high precision, which undoubtedly increases the experimental cost. By setting valve V4, the direction of adjusting the opening of valve V4 and valve V11 when adjusting the opening can be opposite (that is, the opening of valve V4 is adjusted from small to large, and the opening of valve V11 is adjusted from large to small, or the opening of valve V4 is adjusted from large to small, and the opening of valve V11 is adjusted from small to large), the error caused by the hysteresis of the valve itself can be reduced, thereby improving the experimental accuracy.

[0077] It should be pointed out that there is no need to set up a valve similar to valve V4 in the first test loop. This is because the opening of valve V8 in the first test loop is adjustable, and the openings of valve V8 and valve V12 can be directly adjusted in opposite directions during adjustment, thereby reducing the error caused by the valve's own hysteresis and improving the experimental accuracy.

[0078] It should be noted that when valve V4 is set, the reverse flow rate , Reverse pressure difference The lift between the main pump and the second main pump must meet the following requirements:

[0079]

[0080] in: are the fully open flow resistance coefficients of valve V4 respectively.

[0081] In one embodiment, the opening of valve V4 Use the following formula for quick calculation:

[0082]

[0083]

[0084]

[0085] Where: is the opening of valve V4; is the resistance opening curve of valve V4; is the resistance opening curve of valve V8; is the valve V8 opening; is the head of the second main pump; is the medium density of the second test circuit; is the indication of the sixth flow meter; , is the fully open flow resistance coefficient of valve V6, valve V10 and valve V8, Reverse flow rate.

[0086] This design, through the quick calculation formula, can greatly improve the experimental efficiency and help the experimenter find the opening debugging point of valve V4 as soon as possible.

[0087] In one embodiment, in the first test loop 1, the first heater is connected in parallel at both ends of the first main pump, and the valve V2 is connected in series on the branch where the first heater is located; in the second test loop, the second heater is connected in parallel at both ends of the second main pump, and the valve V6 is connected in series on the branch where the second heater is located. In this design, the medium in the first test loop 1 and the second test loop can be heated by the first heater and the second heater, so that the system can perform high temperature experiments on the tested valves.

[0088] In one embodiment, in the first test loop 1, the first cooler is connected in parallel at both ends of the first main pump, and the valve V5 is connected in series on the branch where the first heater is located; in the second test loop, the second cooler is connected in parallel at both ends of the second main pump, and the valve V3 is connected in series on the branch where the second heater is located. In this design, the medium in the first test loop 1 and the second test loop can be cooled by the first cooler and the second cooler, so that the system can perform low-temperature experiments on the tested valve. At the same time, the setting of the cooler and the corresponding heater allows the tested valve to perform high and low temperature cycle tests, that is, the tested valve first operates at a temperature of T1, and then the tested valve is cut off and quickly reduced to operate at a temperature of T2, and then returns to T1 temperature, so as to simulate the operating conditions of the boundary cut-off valve under accident conditions, so as to verify whether the tested valve can work normally under rapid temperature alternation. In addition, this solution does not discharge the medium, and has the characteristics of long cycle and low cost.

[0089] The present invention also discloses a valve testing method, which adopts the above-mentioned valve testing system. The valve testing method includes an opening and closing test of the valve, and the opening and closing test of the valve includes the following steps:

[0090] S1. Debug the first test loop 1, fully open valves V7 and V1, open valves V8 and V12, close the other valves, adjust the opening of valve V8 so that the pressure at both ends of valve V8 is the test pressure of the tested valve, and adjust the opening of valve V12 so that the first main pump is in rated working condition;

[0091] S2. Debug the second test circuit, fully open valves V10 and V13, keep the opening of valve V8 unchanged, open valves V4 and V11, and close the other valves. Adjust the opening of valve V4 so that the pressure at both ends of valve V8 is the test pressure of the tested valve, and adjust the opening of valve V11 so that the second main pump is in rated working condition;

[0092] S3. Open and close valve V1 and valve V7 at the same time, or open and close valve V10 and valve V13 at the same time, to realize the opening and closing test of the valve.

[0093] It should be pointed out that the test valve in the opening and closing test of the valve is a valve that automatically closes when the medium flows in the reverse direction, such as a check valve or a stop valve; if the test valve is an active valve, any one of the first test circuit 1 and the second test circuit can be connected to the test section, and then the test valve can be directly controlled to perform opening and closing actions to realize the opening and closing test of the valve.

[0094] In one embodiment, the valve testing method further includes a high and low temperature test, and the high and low temperature test includes a temperature adjustment step arranged before step S3:

[0095] Open valves V2 and V6, or valves V5 and V3, and adjust the openings of valves V12 and V11 to keep the first main pump and the second main pump at rated operating conditions. Adjust the temperature of the medium in the first test loop 1 and the second test loop through the corresponding cooler or heater.

[0096] In a specific implementation, the temperature of the medium in the corresponding first test loop 1 and the second test loop is adjusted to a preset temperature through a corresponding cooler or heater, and then a high and low temperature test of the test valve can be performed through step S3 to check whether the test valve can work normally under the corresponding temperature conditions.

[0097] In one embodiment, the valve testing method further includes a high-low temperature cycle test, and the high-low temperature cycle test includes a temperature rise and fall step provided before step S3:

[0098] Open valve V2 or valve V5 in the first test loop 1 to increase or decrease the temperature of the first test loop 1;

[0099] Open valve V3 or valve V6 in the second test loop to cool down or heat up the second test loop; wherein, it is required that one of the first test loop 1 and the second test loop has a higher temperature and the other has a lower temperature;

[0100] Adjust the opening of valve V12 and valve V11 to make the first main pump and the second main pump in rated working condition.

[0101] In a specific implementation, the temperature of the medium in the corresponding first test loop 1 and the second test loop is adjusted to a preset temperature through a corresponding cooler or heater, and then a high and low temperature cycle test of the test valve can be performed through step S3 to verify whether the test valve can work normally under rapid temperature alternation.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0103] It should be noted that if the embodiments of the invention involve directional indications (such as up and down), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0104] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, "multiple" means more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the invention.

Claims

1. A valve testing system, characterized in that: It comprises a test section, a first test circuit (1) and a second test circuit, wherein a test valve to be tested is connected to the test section, the first test circuit (1) and the second test circuit are respectively connected in parallel with the test section and are respectively used to provide a test medium to the test section, and the flow directions of the medium in the first test circuit (1) and the second test circuit through the test section are opposite; The first test circuit (1) comprises a first main pump, two ends of the first main pump connected in parallel with the test section are provided with valves V1 and V7 respectively, and also comprises a valve V12 connected in parallel with the two ends of the first main pump; The second test circuit includes a second main pump, and the two ends of the second main pump connected in parallel with the test section are respectively provided with valves V10 and valve V13, and also includes a valve V11 connected in parallel with the two ends of the second main pump, and the valves V1 and V7 are interlocked with the valves V10 and V13. When the valves V1 and V7 are opened, the valves V10 and V13 are closed, and when the valves V10 and V13 are opened, the valves V1 and V7 are closed; It also includes a pressure regulating circuit connected in parallel with the test section, in which a valve V8 is connected in series.

2. The valve testing system according to claim 1, characterized in that: The calibers of the valves V1, V7, V10 and V13 are greater than or equal to the caliber of the tested valve.

3. The valve testing system according to claim 1 or 2, characterized in that: The flow direction of the medium in the first test loop (1) is defined as the forward direction, and the flow direction of the medium in the second test loop is defined as the reverse direction. The forward flow rate With reverse flow The density of the medium is affected by the following function: in: is the density of the fluid in the first test circuit; is the density of the fluid in the second test loop; the forward flow rate It is the flow rate of the test section when the first test circuit is connected to the test section; the reverse flow rate It is the flow rate of the test section when the second test circuit is connected to the test section.

4. The valve testing system according to claim 1 or 2, characterized in that: The flow direction of the medium in the first test loop (1) is defined as the forward direction, and the flow direction of the medium in the second test loop is defined as the reverse direction. The forward flow rate , Positive pressure difference The lift between the first main pump must meet the following requirements: Reverse flow rate , Reverse pressure difference The lift between the main pump and the second main pump must meet the following requirements: in: are the fully open flow resistance coefficients of valve V7, valve V1, valve V10 and valve V13 respectively; is the head of the first main pump; is the head of the second main pump; positive pressure difference It is the pressure difference at both ends of the test section when the first test circuit is connected to the test section; reverse pressure difference is the pressure difference at both ends of the test section when the second test circuit is connected to the test section; forward flow rate It is the flow rate of the test section when the first test circuit is connected to the test section; the reverse flow rate is the flow rate of the test section when the second test circuit is connected to the test section; is the density of the fluid in the first test circuit; is the density of the fluid in the second test loop.

5. The valve testing system according to claim 1 or 2, characterized in that: A first pressure gauge and a first flow meter are provided on the branch where the first main pump is located, a second pressure gauge and a second flow meter are provided on the branch where the second main pump is located, and a third pressure gauge and a third flow meter are provided on the test section; a fourth pressure gauge and a fourth flow meter are provided on the branch where the valve V1 is located; a fifth pressure gauge and a fifth flow meter are provided on the branch where the valve V8 is located; and a sixth pressure gauge and a sixth flow meter are provided on the branch where the valve V13 is located.

6. The valve testing system according to claim 1 or 2, characterized in that: A valve V4 is provided at one end of the second test loop connected to the test section. When the second test loop is working, the medium flowing through the valve V8 and the test section flows back to the second main pump through the valve V4.

7. The valve testing system according to claim 6, characterized in that: When debugging the second test circuit after adjusting the first test circuit (1), the opening of valve V8 remains unchanged, and the opening directions of valve V4 and valve V11 are adjusted in opposite directions.

8. The valve testing system according to claim 6, characterized in that: The opening of the valve V4 is quickly calculated using the following formula: Where: is the resistance opening curve of valve V4; is the resistance opening curve of valve V8; is the valve V8 opening; is the head of the second main pump; is the medium density of the second test circuit; is the indication of the sixth flow meter; , is the fully open flow resistance coefficient of valve V6, valve V10 and valve V8, Reverse flow rate.

9. The valve testing system according to claim 1 or 2, characterized in that: In the first test loop (1), a first heater is connected in parallel at both ends of the first main pump, and a valve V2 is connected in series on the branch where the first heater is located; in the second test loop, a second heater is connected in parallel at both ends of the second main pump, and a valve V6 is connected in series on the branch where the second heater is located.

10. The valve testing system according to claim 9, characterized in that: In the first test loop (1), a first cooler is connected in parallel at both ends of the first main pump, and a valve V5 is connected in series on the branch where the first heater is located; in the second test loop, a second cooler is connected in parallel at both ends of the second main pump, and a valve V3 is connected in series on the branch where the second heater is located.

11. A valve testing method, characterized in that: The valve testing system according to any one of claims 1 to 10 is adopted, wherein the valve testing method comprises an opening and closing test of the valve, and the steps are as follows: S1. Debug the first test circuit (1), fully open valves V7 and valve V1, open valves V8 and valve V12, and close the remaining valves. Adjust the opening of valve V8 so that the pressure at both ends of valve V8 is the test pressure of the tested valve, and adjust the opening of valve V12 so that the first main pump is in the rated working condition; S2. Debug the second test circuit, fully open valves V10 and V13, keep the opening of valve V8 unchanged, open valves V4 and V11, and close the other valves. Adjust the opening of valve V4 so that the pressure at both ends of valve V8 is the test pressure of the tested valve, and adjust the opening of valve V11 so that the second main pump is in rated working condition; S3. Open and close valve V1 and valve V7 at the same time, or open and close valve V10 and valve V13 at the same time, to realize the opening and closing test of the valve.

12. The valve testing method according to claim 11, characterized in that: It also includes a high and low temperature test, which includes a temperature adjustment step arranged before step S3: Open valves V2 and V6, or valves V5 and V3, and adjust the openings of valves V12 and V11 to place the first main pump and the second main pump at rated operating conditions. Adjust the temperature of the medium in the first test loop (1) and the second test loop through the corresponding cooler or heater.

13. The valve testing method according to claim 11, characterized in that: The test also includes a high and low temperature cycle test, wherein the high and low temperature cycle test includes a temperature rise and fall step before step S3: Opening the valve V2 or the valve V5 in the first test circuit (1) to increase or decrease the temperature of the first test circuit (1); Open the valve V3 or the valve V6 in the second test circuit to cool down or heat up the second test circuit; wherein, it is required that one of the first test circuit (1) and the second test circuit has a higher temperature and the other has a lower temperature; Adjust the opening of valve V12 and valve V11 to make the first main pump and the second main pump in rated working condition.

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