Drain valve performance testing device

Abstract

The utility model provides a drain valve performance testing device, which comprises a testing pipeline with a high-pressure end used for introducing high-pressure gas and a low-pressure end used for discharging gas; the liquid storage part is provided with a liquid inlet, an air inlet and a liquid outlet, and the air inlet is communicated with the high-pressure end of the test pipeline; the inlet end pressure sensor is arranged at the high-pressure end; the outlet end pressure sensor is arranged at the low-pressure end; the drain valve is arranged between the liquid storage part and the outlet end pressure sensor, an inlet of the drain valve is communicated with a liquid outlet of the liquid storage part, and an outlet of the drain valve is communicated with the low-pressure end so as to drain liquid through the low-pressure end; the data acquisition unit is used for acquiring the pressure data of the inlet end pressure sensor, the pressure data of the outlet end pressure sensor, the time data when the drain valve is in the open state and the displacement of the liquid storage part when the drain valve is in the open state. According to the scheme, the drainage rate of the drainage valve under different pressure differences can be tested.

Description

Technical Field

[0001] The utility model relates to the technical field of drain valve performance testing, in particular to a drain valve performance testing device. Background Art

[0002] In the fuel cell engine system, the effectiveness of anode drainage is crucial to maintaining the performance of the fuel cell stack and extending its service life. During the anode drainage process, the control of the drain valve is particularly critical, which directly affects the water removal efficiency inside the fuel cell stack.

[0003] Different drain valves have different drainage rates under different operating pressure difference conditions. In the prior art, empirical formulas are usually relied on to estimate the drainage rate of the drain valve to control the working state of the drain valve inside the battery stack. However, the accuracy of estimating the drainage rate of the drain valve by empirical formula is low. During the actual operation of the battery stack, controlling the working state of the drain valve by the estimated drainage rate will affect the water removal effect inside the battery stack. The battery stack may be flooded or emptied, affecting the consistency of the battery stack operation and may accelerate the attenuation of the battery stack. Utility Model Content

[0004] The utility model provides a drain valve performance testing device to solve the problem in the prior art that the working state of the drain valve is controlled by estimating the rate of the drain valve, thereby affecting the water discharge effect inside the battery stack.

[0005] The utility model provides a drain valve performance testing device, which comprises: a test pipeline, having a high-pressure end and a low-pressure end arranged relatively, the high-pressure end is used to pass high-pressure gas, and the low-pressure end is used to discharge gas; a liquid storage part, having a liquid inlet, an air inlet and a liquid discharge port, the air inlet is connected with the high-pressure end of the test pipeline; an inlet pressure sensor, which is arranged at the high-pressure end of the test pipeline to detect the pressure of the high-pressure end; an outlet pressure sensor, which is arranged at the low-pressure end of the test pipeline to detect the pressure of the low-pressure end; wherein the drain valve to be tested is arranged between the liquid storage part and the outlet pressure sensor, the inlet of the drain valve is connected with the liquid discharge port of the liquid storage part, and the outlet of the drain valve is connected with the low-pressure end to discharge liquid through the low-pressure end; a data acquisition unit, which is used to acquire pressure data of the inlet pressure sensor, pressure data of the outlet pressure sensor, time data when the drain valve is in an open state, and the drainage volume of the liquid storage part when the drain valve is in an open state.

[0006] Furthermore, the drain valve performance testing device also includes: a pressure regulating part, which is arranged at the high-pressure end of the test pipeline to adjust the pressure at the high-pressure end.

[0007] Furthermore, the pressure regulating part includes: a primary pressure regulating valve, which is arranged on the test pipeline and located upstream of the liquid storage part.

[0008] Furthermore, the pressure regulating unit also includes: an exhaust pipe, one end of which is connected to the test pipeline, and the connection position between the exhaust pipe and the test pipeline is between the first-level pressure regulating valve and the liquid storage unit; a second-level pressure regulating valve, which is arranged on the exhaust pipe.

[0009] Furthermore, the drain valve performance testing device also includes: a control system, which is electrically connected to the primary pressure regulating valve and the secondary pressure regulating valve respectively; and / or, is electrically connected to the drain valve.

[0010] Furthermore, the drain valve performance testing device also includes: a muffler, which is arranged on the exhaust pipe and located downstream of the secondary pressure regulating valve.

[0011] Furthermore, the drain valve performance testing device also includes: a liquid storage tank, the liquid outlet end of the liquid storage tank is used to communicate with the liquid inlet of the liquid storage part, and the pressure in the liquid storage tank is the same as the pressure in the liquid storage part; a liquid replenishing valve is arranged at the liquid outlet end of the liquid storage tank.

[0012] Furthermore, the testing device also includes: a pressure balance tube, one end of which is connected to the high-pressure end of the testing pipeline, and the other end of which is connected to the liquid storage tank.

[0013] Further, the liquid storage tank is located above the liquid storage portion.

[0014] Furthermore, the liquid storage part includes a measuring cylinder, which is made of a transparent material. A scale is arranged on the side wall of the measuring cylinder. The measuring cylinder has a liquid inlet, an air inlet and a liquid discharge port. The liquid inlet is arranged at the top of the measuring cylinder to inject water into the measuring cylinder; the air inlet is arranged at the top of the measuring cylinder to allow high-pressure gas to be introduced into the measuring cylinder; the liquid discharge port is arranged at the bottom of the measuring cylinder to discharge the water inside the measuring cylinder.

[0015] By applying the technical solution of the utility model, it is possible to test the drainage rate of the drain valve under different operating pressure difference conditions. Specifically, when it is necessary to test the drainage rate of the drain valve under different operating pressure conditions, the pressure data at the high-pressure end is maintained at the first preset pressure P1, and the pressure data at the low-pressure end is maintained at the second preset pressure P2, wherein the first preset pressure P1 is greater than the second preset pressure P2. The data acquisition unit collects the pressure data P1 of the inlet pressure sensor, the pressure data P2 of the outlet pressure sensor, the time data T when the drain valve is in the open state, and the drainage volume V of the liquid storage part when the drain valve is in the open state. When the pressure difference is P1-P2, the drainage rate of the drain valve is By adjusting different P1 and P2 and repeating the above steps, the drainage rate of the drain valve under different pressure differences can be obtained.

[0016] The setting of this scheme simulates the gas pressure at the water inlet and the gas pressure at the water outlet of the drain valve after the drain valve is assembled on the fuel cell stack through pressure data P1 and P2, respectively, to determine the drainage rate of the drain valve under different pressure difference conditions. After the drain valve is assembled on the fuel cell stack, it is possible to achieve precise control of the water content inside the fuel cell stack, avoid flooding or emptying, thereby improving the consistency of the fuel cell stack and extending the service life of the fuel cell stack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A schematic structural diagram of a drain valve performance testing device provided in an embodiment of the utility model is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Test pipeline; 101. High pressure end; 102. Low pressure end;

[0021] 20. Liquid storage part; 201. Liquid inlet; 202. Air inlet; 203. Liquid discharge port;

[0022] 30. Inlet pressure sensor;

[0023] 40. Outlet pressure sensor;

[0024] 50. Pressure regulating unit; 51. Primary pressure regulating valve; 52. Exhaust pipe; 53. Secondary pressure regulating valve;

[0025] 60. Control system;

[0026] 70. Silencer;

[0027] 81. Liquid storage tank; 82. Liquid replenishing valve; 83. Pressure balance pipe;

[0028] 01. Drain valve. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1 As shown, the embodiment of the utility model provides a drain valve performance test device, which includes: a test pipeline 10, having a high-pressure end 101 and a low-pressure end 102 arranged relatively, the high-pressure end 101 is used to pass high-pressure gas, and the low-pressure end is used to discharge gas; a liquid storage part 20, having a liquid inlet 201, an air inlet 202 and a liquid discharge port 203, the air inlet 202 is connected to the high-pressure end 101 of the test pipeline 10; an inlet pressure sensor 30, which is arranged at the high-pressure end 101 of the test pipeline 10 to detect the pressure of the high-pressure end 101; an outlet pressure sensor 40, which is arranged at the test pipeline The low-pressure end 102 of the circuit 10 is used to detect the pressure of the low-pressure end 102; wherein the drain valve 01 to be tested is arranged between the liquid storage part 20 and the outlet pressure sensor 40, the inlet of the drain valve 01 is connected with the discharge port 203 of the liquid storage part 20, and the outlet of the drain valve 01 is connected with the low-pressure end 102 to discharge liquid through the low-pressure end 102; a data acquisition unit is used to collect pressure data of the inlet pressure sensor 30, pressure data of the outlet pressure sensor 40, time data when the drain valve 01 is in the open state, and the drainage volume of the liquid storage part 20 when the drain valve 01 is in the open state. Figure 1 The direction of the arrow in the middle is the flow direction of the gas.

[0031] By applying the technical solution of the utility model, it is possible to test the drainage rate of the drain valve 01 under different operating pressure difference conditions. Specifically, when it is necessary to test the drainage rate of the drain valve 01 under different operating pressure conditions, the pressure data of the high-pressure end 101 is maintained at the first preset pressure P1, and the pressure data of the low-pressure end 102 is maintained at the second preset pressure P2, wherein the first preset pressure P1 is greater than the second preset pressure P2. The data acquisition unit collects the pressure data P1 of the inlet pressure sensor 30, the pressure data P2 of the outlet pressure sensor 40, the time data T when the drain valve 01 is in the open state, and the drainage volume V of the liquid storage part 20 when the drain valve 01 is in the open state. When the pressure difference is P1-P2, the drainage rate of the drain valve 01 is By adjusting different P1 and P2 and repeating the above steps, the drainage rate of the drain valve 01 under different pressure differences can be obtained.

[0032] In the fuel cell stack, water is prone to accumulate at the outlet of the hydrogen channel. There is a water accumulation chamber connected to the outlet of the hydrogen channel downstream. After the tested drain valve 01 is installed on the fuel cell stack, the drain valve 01 controls the discharge of the accumulated water in the water accumulation chamber, that is, the pressure at the water inlet end and the pressure at the water outlet end of the drain valve 01 are different.

[0033] In this solution, the gas introduced into the high-pressure end 101 simulates the hydrogen introduction into the battery stack, and the liquid storage part 20 simulates the water accumulation chamber of the battery stack. In addition, this solution simulates the hydrogen pressure of the hydrogen channel and the gas pressure at the water outlet of the drain valve 01 after the drain valve 01 is assembled on the battery stack through pressure data P1 and P2, respectively, to determine the drainage rate of the drain valve 01 under different pressure differences. After the above-mentioned drain valve 01 is assembled on the battery stack, it is possible to achieve precise control of the water content inside the battery stack, avoid flooding or emptying, thereby improving the consistency of the battery stack and extending the service life of the battery stack.

[0034] Specifically, when the stack is working normally at 0 altitude, the anode pressure is usually between 110kPa and 280kPa, and the pressure at the outlet of the drain valve in the stack is determined according to the design of the corresponding stack. Specifically, the pressure P1 can be set between 110kPa and 280kPa, and the drainage rate of the drain valve 01 under different pressure differences can be set in sequence with 110kPa as the reference and 2kPa as the incremental value.

[0035] Furthermore, the drain valve performance test device also includes a pressure regulating unit 50, which is arranged at the high-pressure end 101 of the test pipeline 10 to adjust the pressure of the high-pressure end 101. Such an arrangement can facilitate the precise control and automatic control of the pressure at the high-pressure end 101, thereby simulating various pressure difference situations that the battery stack may encounter during actual operation under different test conditions. That is, through the adjustment of the pressure regulating unit 50, it is possible to ensure that the drain valve 01 is tested for performance under different operating pressure differences to obtain more accurate drainage rate data.

[0036] In the embodiment of the present scheme, the pressure regulating unit 50 includes a first-stage pressure regulating valve 51, which is arranged on the test pipeline 10 and is located upstream of the liquid storage unit 20. The first-stage pressure regulating valve 51 is arranged upstream of the liquid storage unit 20. Such an arrangement facilitates pressure regulation and ensures that the liquid has been adjusted to the required pressure before flowing into the drain valve 01, thereby reducing pressure fluctuations in the system and ensuring the stability and repeatability of the test. In addition, the first-stage pressure regulating valve 51 is arranged upstream of the liquid storage unit 20 to more realistically simulate the working pressure state inside the fuel cell stack.

[0037] Furthermore, the pressure regulating unit 50 also includes an exhaust pipe 52 and a secondary pressure regulating valve 53. One end of the exhaust pipe 52 is connected to the test pipeline 10. The connection position between the exhaust pipe 52 and the test pipeline 10 is between the primary pressure regulating valve 51 and the liquid storage unit 20. The secondary pressure regulating valve 53 is arranged on the exhaust pipe 52. The primary pressure regulating valve 51 is responsible for setting the main pressure, while the secondary pressure regulating valve 53 can fine-tune the pressure to meet more sophisticated pressure control requirements, and the secondary pressure regulating valve 53 can alleviate the pressure shock that may be caused by the rapid adjustment of the primary pressure regulating valve 51, ensuring a smooth pressure change. In addition, the presence of the exhaust pipe 52 and the secondary pressure regulating valve 53 allows the system to release excess gas when adjusting the pressure, preventing gas from accumulating in the system and affecting the stability of the pressure and the accuracy of the test.

[0038] In the embodiment of the present solution, the drain valve performance test device further includes a control system 60, which is electrically connected to the primary pressure regulating valve 51 and the secondary pressure regulating valve 53. Through the control system 60, the opening of the primary pressure regulating valve 51 and the secondary pressure regulating valve 53 can be accurately adjusted to achieve accurate control of the test pressure.

[0039] Furthermore, the control system 60 is also electrically connected to the drain valve 01. With such an arrangement, the control system 60 can control the opening and closing of the drain valve 01, further improving the automation level of the device.

[0040] Furthermore, the drain valve performance test device further includes a muffler 70, which is disposed on the exhaust pipe 52 and is located downstream of the secondary pressure regulating valve 53. Vibrations may be generated during the exhaust process, and the muffler 70 can reduce these vibrations and improve the stability of the entire test system.

[0041] In an embodiment of the present scheme, the drain valve performance test device further includes a liquid storage tank 81 and a liquid replenishing valve 82. The liquid outlet end of the liquid storage tank 81 is used to communicate with the liquid inlet 201 of the liquid storage part 20. The pressure in the liquid storage tank 81 is the same as the pressure in the liquid storage part 20. The liquid replenishing valve 82 is arranged at the liquid outlet end of the liquid storage tank 81. The liquid storage tank 81 provides an additional source of liquid for the liquid storage part 20, so that the liquid can be continuously replenished during the test process, thereby realizing long-term continuous testing without frequent interruptions for refilling. The liquid replenishing valve 82 can be opened and closed quickly, allowing the liquid storage part 20 to be quickly replenished with liquid when needed, thereby reducing the waiting time during the test process. The pressure in the liquid storage tank 81 is the same as the pressure in the liquid storage part 20, which helps to maintain the consistency of the liquid pressure throughout the test process and ensure the stability of the test conditions.

[0042] Specifically, the test device further includes a pressure balance tube 83, one end of which is connected to the high-pressure end 101 of the test pipeline 10, and the other end of which is connected to the liquid storage tank 81. The pressure balance tube 83 ensures that the pressure between the high-pressure end 101 of the test pipeline 10 and the liquid storage tank 81 remains consistent, which helps to maintain the required pressure level during the entire test process. When the liquid storage part 20 needs to be replenished with liquid, the pressure balance tube 83 can quickly transport the liquid in the liquid storage tank 81 to the test pipeline, thereby improving the replenishment efficiency.

[0043] In the embodiment of this solution, the liquid replenishing valve 82 is a manual valve.

[0044] In other embodiments of the present solution, the liquid replenishing valve 82 is a solenoid valve, and the control system 60 is electrically connected to the solenoid valve to achieve automatic control of the solenoid valve.

[0045] In the embodiment of the present scheme, the pressure balance pipe 83 is connected to the exhaust pipe 52 , and the pressure balance pipe 83 is connected to the test pipeline 10 through the exhaust pipe 52 . The connection position between the pressure balance pipe 83 and the exhaust pipe 52 is located upstream of the secondary pressure regulating valve 53 .

[0046] Furthermore, the liquid storage tank 81 is located above the liquid storage part 20. The liquid storage tank 81 is located above to help the liquid flow naturally into the liquid storage part 20 by gravity, thereby reducing or eliminating the reliance on power equipment such as pumps.

[0047] In the embodiment of the present scheme, the liquid storage part 20 includes a measuring cylinder, which is made of a transparent material, and has a scale on the side wall of the measuring cylinder. The measuring cylinder has a liquid inlet 201, an air inlet 202 and a liquid discharge port 203. The liquid inlet 201 is arranged at the top of the measuring cylinder to inject water into the measuring cylinder; the air inlet 202 is arranged at the top of the measuring cylinder to allow high-pressure gas to enter the measuring cylinder; the liquid discharge port 203 is arranged at the bottom of the measuring cylinder to discharge the water inside the measuring cylinder. The measuring cylinder has a scale, which can accurately measure the volume of the liquid, allowing the operator to directly observe the liquid level changes, facilitating real-time monitoring and adjustment, simplifying the reading and recording process of the liquid amount, and reducing the complexity of operation.

[0048] Specifically, during the test, the pressure data P1 of the inlet pressure sensor and the pressure data P2 of the outlet pressure sensor are kept at preset values ​​and in a stable state;

[0049] The highest liquid level in the measuring cylinder reaches 80% of the measuring cylinder scale, and the liquid replenishing valve 82 and the drain valve 01 are both in the closed state;

[0050] Open the drain valve 01 until the liquid level in the measuring cylinder reaches 20% of the scale of the measuring cylinder, and then close the drain valve 01;

[0051] In the above process, the data acquisition unit collects the pressure data P1 of the inlet pressure sensor, the pressure data P2 of the outlet pressure sensor, the time data T when the drain valve is in the open state, and the drainage volume V of the liquid storage part when the drain valve is in the open state, and finally calculates the drainage rate of the drain valve when the pressure difference is P1-P2;

[0052] When it is necessary to test the drainage rate of the drain valve 01 under different pressures of the high-pressure end 101 and the low-pressure end 102, adjust the pressure of the high-pressure end 101 and the pressure of the low-pressure end 102 according to the test requirements and repeat the above steps.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A drain valve performance testing device, characterized in that: The drain valve performance testing device comprises: The test pipeline (10) has a high-pressure end (101) and a low-pressure end (102) arranged opposite to each other, wherein the high-pressure end (101) is used to introduce high-pressure gas, and the low-pressure end (102) is used to discharge gas; A liquid storage portion (20) having a liquid inlet (201), an air inlet (202) and a liquid discharge port (203), wherein the air inlet (202) is in communication with the high-pressure end (101) of the test pipeline (10); An inlet pressure sensor (30) is arranged at the high-pressure end (101) of the test pipeline (10) to detect the pressure of the high-pressure end (101); an outlet pressure sensor (40) disposed at the low-pressure end (102) of the test pipeline (10) to detect the pressure of the low-pressure end (102); wherein the drain valve (01) to be tested is disposed between the liquid storage portion (20) and the outlet pressure sensor (40), the inlet of the drain valve (01) being connected to the liquid discharge port (203) of the liquid storage portion (20), and the outlet of the drain valve (01) being connected to the low-pressure end (102) to discharge liquid through the low-pressure end (102); A data acquisition unit is used to collect pressure data of the inlet pressure sensor (30), pressure data of the outlet pressure sensor (40), time data when the drain valve (01) is in the open state, and the amount of water discharged from the liquid storage part (20) when the drain valve (01) is in the open state.

2. The drain valve performance testing device according to claim 1, characterized in that: The drain valve performance testing device also includes: A pressure regulating unit (50) is provided at the high-pressure end (101) of the test pipeline (10) to regulate the pressure of the high-pressure end (101).

3. The drain valve performance testing device according to claim 2, characterized in that: The pressure regulating unit (50) comprises: A primary pressure regulating valve (51) is arranged on the test pipeline (10) and is located upstream of the liquid storage portion (20).

4. The drain valve performance testing device according to claim 3, characterized in that: The pressure regulating unit (50) further comprises: an exhaust pipe (52), one end of the exhaust pipe (52) being in communication with the test pipeline (10), and a connection position between the exhaust pipe (52) and the test pipeline (10) being between the primary pressure regulating valve (51) and the liquid storage portion (20); A secondary pressure regulating valve (53) is arranged on the exhaust pipe (52).

5. The drain valve performance testing device according to claim 4, characterized in that: The drain valve performance testing device also includes: The control system (60) is electrically connected to the primary pressure regulating valve (51) and the secondary pressure regulating valve (53), respectively; and / or is electrically connected to the drain valve (01).

6. The drain valve performance testing device according to claim 4, characterized in that: The drain valve performance testing device also includes: The silencer (70) is arranged on the exhaust pipe (52) and is located downstream of the secondary pressure regulating valve (53).

7. The drain valve performance testing device according to any one of claims 1 to 6, characterized in that: The drain valve performance testing device also includes: A liquid storage tank (81), wherein a liquid outlet end of the liquid storage tank (81) is used to communicate with a liquid inlet (201) of the liquid storage portion (20), and the pressure in the liquid storage tank (81) is the same as the pressure in the liquid storage portion (20); The liquid replenishing valve (82) is arranged at the liquid outlet end of the liquid storage tank (81).

8. The drain valve performance testing device according to claim 7, characterized in that: The testing device also includes: A pressure balance tube (83), one end of which is in communication with the high-pressure end (101) of the test pipeline (10), and the other end of which is in communication with the liquid storage tank (81).

9. The drain valve performance testing device according to claim 7, characterized in that: The liquid storage tank (81) is located above the liquid storage portion (20).

10. The drain valve performance testing device according to any one of claims 1 to 6, characterized in that: The liquid storage part (20) comprises a measuring cylinder, which is made of a transparent material. A scale is arranged on the side wall of the measuring cylinder. The measuring cylinder has the liquid inlet (201), the air inlet (202) and the liquid discharge port (203). The liquid inlet (201) is arranged at the top of the measuring cylinder to inject water into the measuring cylinder; the air inlet (202) is arranged at the top of the measuring cylinder to allow high-pressure gas to be introduced into the measuring cylinder; and the liquid discharge port (203) is arranged at the bottom of the measuring cylinder to discharge water inside the measuring cylinder.

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