Testing device and method for aircraft fuel system equipment

Abstract

The invention provides a test device and method for aircraft fuel system equipment, and belongs to the field of aircraft fuel systems, in the test equipment, a test box body is a double-layer box body, and a box cover area is provided with a plurality of interfaces used for installing a heater, a pressure gauge, a sealing cover, a pressure relief valve and the like; and a plurality of interfaces are also formed in the box bottom area and used for mounting a sediment discharging valve, a thermometer, an oil gauge and the like. The device is suitable for installation of various devices of the aircraft fuel system and development of multiple sealing tests, oil drainage flow tests and pressure-flow (gas) tests, and has high practicability and universality; the system is simple in structure, easy to operate, convenient to develop and use, high in economic benefit, high in function integration, capable of being used in an aircraft fuel system and extremely high in popularization value.

Description

Technical Field

[0001] The invention belongs to the field of aircraft fuel systems, and relates to a test device and method for aircraft fuel system equipment. Background Art

[0002] There are many kinds of equipment in the aviation fuel system, such as sedimentation valves and pressure relief valves. Such equipment needs to complete sealing tests, flow discharge tests, pressure-flow (gas) tests, etc. before finalization to ensure that they meet the technical requirements. Each test requires the use of different test devices, which are numerous and complex. Summary of the invention

[0003] To solve the above problems, the present invention provides a test device and method for aircraft fuel system equipment, which can complete multiple tests of multiple equipment in the fuel system, has a simple structure, simple operation, strong practicality, wide application range and good versatility.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A test device for aircraft fuel system equipment, the test device comprising a test box 1, a bracket 2, a heater 3, a fuel gauge 4, a temperature gauge 5, a pressure gauge 6, a sealing cover 7, a hose assembly 8, an adapter 9, a flow meter 10, a plug cap 11, and a sealing member 14.

[0006] The test box 1 is a double-layer box, the inner box is used to add aviation fuel, and the outer box is formed between the inner and outer boxes for adding water; the top box cover area of ​​the test box 1 is provided with a pressurization interface 15, a test medium addition interface 16, a pressure relief valve installation interface 17, a pressure gauge installation interface 18, a heating interface 22 and an exhaust hole 23, wherein the test medium addition interface 16 is used to add aviation fuel to the inner box, the pressure gauge installation interface 18 is used to install the pressure gauge 6, the heating interface 22 is used to install the heater 3, and also serves as the water injection port of the outer box, and the pressure relief valve installation interface 17 is an annular installation The platform is provided with two circles of bolt mounting holes, the outer circle is used for sealing connection with the sealing cover 7 through bolts 12 and nuts 13, and the inner circle is used for installing the pressure relief valve to be tested; the bottom area of ​​the test box 1 is provided with a sedimentation valve mounting interface 19, a temperature gauge mounting interface 20 and an oil meter connecting interface 21, wherein the sedimentation valve mounting interface 19 is used for installing the sedimentation valve to be tested, the temperature gauge mounting interface 20 is used for installing the temperature gauge 5, and the oil meter connecting interface 21 is used for installing the oil meter 4, so that the oil meter 4 is connected with the inner box, and the oil meter 4 is installed on the outer wall of the test box 1, and is used to measure the amount of fuel in the inner box.

[0007] The heater 3 is plug-in type, the heating temperature can be adjusted, and the root has an internal thread, which is screwed to the heating interface 22 to maintain stable installation.

[0008] The pressure gauge 6 is connected to the inner box body to measure the pressure inside the inner box body, and is a universal electronic display pressure gauge for water, gas and oil.

[0009] The lower part of the sealing cover 7 is an annular mounting platform that matches the pressure relief valve mounting interface 17. The two are fixedly connected by bolts 12 and nuts 13. The bottom of the sealing cover 7 is provided with a sealing ring mounting groove for arranging the sealing ring 14 to achieve a sealed connection. The top of the sealing cover 7 is provided with an external threaded interface, which is connected to the hose assembly 8.

[0010] The hose assembly 8 is a hose with outer sleeve threads at both ends. One or two hose assemblies 8 are used according to the test needs. When one is used, one end is connected to the sealing cover 7, and the other end is connected to the upstream interface of the flow meter 10. When two are used, on the basis of connecting the sealing cover 7 and the flow meter 10 at both ends, the two hoses are connected to the air filter to be tested through an adapter joint 9.

[0011] The plugging cap 11 is a screw-in plugging cap with an external thread on the top, and a sealing ring installation groove at its root. A corresponding sealing ring 14 is arranged in the groove, which is used to seal the interface as needed during the test or non-test process to ensure the sealing of the test system. The interfaces include: a test medium addition interface 16, a sedimentation valve installation interface 19 and a downstream interface of the flow meter 10.

[0012] The bracket 2 is a circular bracket with a notch, and the test box 1 is installed on the bracket 2 .

[0013] A test method for aircraft fuel system equipment is implemented based on the above test device, and the test method includes a sedimentation valve, a pressure relief valve and an air filter test method. Specifically:

[0014] The operation methods of the various tests of the sedimentation valve are as follows:

[0015] Step 1: Install a plugging cap 11 downstream of the flow meter 10 to seal the pressure relief valve all the way to maintain the sealing of the test device.

[0016] Step 2, place the test device on a flat area, remove the plug cap 11 at the installation interface 19 of the sedimentation valve, and install the sedimentation valve to be tested on the installation interface 19 of the sedimentation valve using a specified torque;

[0017] Step 3, adding aviation fuel to the inner box of the test device through the test medium adding interface 16. The amount of aviation fuel added should meet the test requirements, and the amount of fuel added should be recorded;

[0018] Step 4, for the room temperature sealing test of the sedimentation valve, use a pressurizing device to pressurize the test device through the pressurizing interface 15. When the pressure gauge 6 shows the expected pressure value, operate the pressurizing device to ensure the internal pressure of the test device is stable. After maintaining the pressure for the time required by the test, observe whether there is fuel leakage at the installation place of the sedimentation valve and the valve body itself.

[0019] For the high-temperature sealing test of the settling valve, water is added to the outer container of the test device to a suitable height through the heating interface 22, and then the heater 3 with adjustable heating temperature is installed on the heating interface 22. After the heating is powered on, the fuel temperature is observed to be stable at 85°C through the thermometer 5 and maintained for a time that meets the test requirements. The test device is pressurized through the pressurizing interface 15 using a pressurizing device. When the pressure gauge 6 shows the expected pressure value, the pressurizing device is operated to ensure that the internal pressure of the test device is stable. After maintaining the pressure for the time required by the test, observe whether there is fuel leakage at the installation of the settling valve and the valve body itself.

[0020] For the oil discharge flow test of the sedimentation valve, open the sedimentation valve to the open position and record the amount of fuel reduced within the specified time.

[0021] The operating methods of the various tests of the pressure relief valve are as follows:

[0022] Step 1: Install the plugging cap 11 on the installation interface 19 of the sedimentation valve to achieve sealing and maintain the sealing of the test device.

[0023] Step 2: remove the sealing cover 7 and install the pressure relief valve to be tested on the pressure relief valve installation interface 17.

[0024] Step 3, for the pressure relief valve sealing test, apply foam around the pressure relief valve to be tested, use a pressurizing device to pressurize the test device through the pressurizing interface 15, pressurize to the required test pressure value and maintain it, observe whether there are bubbles in the foam around the device, if there are no bubbles, it proves that the sealing of the device meets the requirements under this pressure.

[0025] For the pressure relief valve opening pressure test, apply foam around the pressure relief valve to be tested, use a pressurizing device to slowly pressurize the test device through the pressurizing interface 15 until bubbles are observed around the pressure relief valve, and observe the indication on the pressure gauge 6, which is the opening pressure of the pressure relief valve.

[0026] For the pressure-flow test of the pressure relief valve, the sealing cover 7 is sealed and connected with the pressure relief valve installation interface 17, and the plugging cap 11 of the downstream interface of the flow meter 10 is removed; the test device is slowly pressurized through the pressurizing interface 15, and after pressurizing to the opening pressure of the pressure relief valve, the test pressure value is increased step by step according to the test requirements, and the corresponding flow data of the flow meter 10 is recorded, and finally the pressure-flow curve is drawn.

[0027] The operating methods of the air filter tests are as follows:

[0028] Step 1: Install the plugging cap 11 on the installation interface 19 of the sedimentation valve to achieve sealing and maintain the sealing of the test device.

[0029] Step 2, remove the hose assembly 8 and the flow meter 10 from the sealing cover 7, use another hose assembly 8 to connect one end of the air filter to be tested through the adapter 9, and connect the other end to the sealing cover 7, and then connect the air filter to be tested to the hose assembly 8 removed from the sealing cover 7 through the adapter 9, and use thread sealing tape at the threaded connection to ensure the sealing of the test device.

[0030] Step 3, for the air filter sealing test, keep the downstream interface of the flow meter 10 still blocked by the plugging cap 11, place the hose assembly 8 connected to the sealing cover 7 and the air filter to be tested in a sink filled with water, and pressurize the test device to the pressure value required by the test through the pressurizing equipment, and observe whether there are bubbles in the air filter to be tested and the connection with the hose assembly 8. If no bubbles are generated, it proves that the equipment is well sealed.

[0031] For the air filter pressure-flow test, remove the plugging cap 11 of the downstream interface of the flow meter 10, pressurize the test device step by step through the pressurizing equipment according to the test requirements, record the value of the flow meter at each pressure level, and finally draw the pressure-flow curve to complete the test.

[0032] The beneficial effects of the present invention are:

[0033] 1. The invention has a simple structure, is easy to operate, is easy to use, and has high economic benefits;

[0034] 2. The present invention is applicable to the installation of various equipment in the aircraft fuel system and the implementation of multiple sealing tests, oil discharge flow tests, and pressure-flow (gas) tests, and has high practicality and versatility;

[0035] 3. The present invention has a high degree of functional integration and can be used in aircraft fuel systems, thus having extremely high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the whole and bottom of the test device, where (a) is the whole schematic diagram and (b) is the bottom schematic diagram;

[0037] Figure 2 The disassembly diagram of the test box, where (a) is a schematic diagram of the interface of the top box cover area, (b) is a schematic diagram of the structure of the bottom box area, and (c) is a schematic diagram of the double-layer cylinder of the box;

[0038] Figure 3is a schematic diagram of the bracket;

[0039] Figure 4 A schematic diagram of a heater with adjustable heating temperature;

[0040] Figure 5 Schematic diagram of a sealing cover, wherein (a) is an overall schematic diagram, and (b) is a bottom view;

[0041] Figure 6 This is a schematic diagram of the adapter;

[0042] Figure 7 It is a schematic diagram of a plugging cap with a sealing ring;

[0043] In the figure: 1 test box; 2 bracket; 3 heater; 4 oil meter; 5 temperature gauge; 6 pressure gauge; 7 sealing cover; 8 hose assembly; 9 adapter joint; 10 flow meter; 11 plugging cap; 12 bolts; 13 nuts; 14 sealing member; 15 pressurizing interface; 16 test medium adding interface; 17 pressure relief valve installation interface; 18 pressure gauge installation interface; 19 sedimentation valve installation interface; 20 temperature gauge installation interface; 21 oil meter connecting interface; 22 heating interface; 23 exhaust hole. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments improved or adjusted by ordinary technicians in this field based on the embodiments of the present invention belong to the protection scope of the present invention.

[0045] A test device for aircraft fuel system equipment, the test device comprising a test box 1, a bracket 2, a heater 3, a fuel gauge 4, a temperature gauge 5, a pressure gauge 6, a sealing cover 7, a hose assembly 8, an adapter 9, a flow meter 10, a plug cap 11, and a sealing member 14.

[0046] like Figure 1 and Figure 2As shown, the test box 1 is a double-layer box, the inner box is used to add aviation fuel, and the outer box is formed between the inner and outer boxes for adding water; the top box cover area of ​​the test box 1 is provided with a pressurizing interface 15, a test medium adding interface 16, a pressure relief valve installation interface 17, a pressure gauge installation interface 18, a heating interface 22 and an exhaust hole 23, wherein the test medium adding interface 16 is used to add aviation fuel to the inner box, the pressure gauge installation interface 18 is used to install the pressure gauge 6, the heating interface 22 is used to install the heater 3, and also serves as a water injection port for the outer box, and the pressure relief valve installation interface 17 is an annular installation The mounting platform is provided with two circles of bolt mounting holes, the outer circle is used for sealing connection with the sealing cover 7 through bolts 12 and nuts 13, and the inner circle is used for installing the pressure relief valve to be tested; the bottom area of ​​the test box 1 is provided with a sedimentation valve mounting interface 19, a temperature gauge mounting interface 20 and an oil meter connecting interface 21, wherein the sedimentation valve mounting interface 19 is used for installing the sedimentation valve to be tested, the temperature gauge mounting interface 20 is used for installing the temperature gauge 5, and the oil meter connecting interface 21 is used for installing the oil meter 4, so that the oil meter 4 is connected with the inner box, and the oil meter 4 is installed on the outer wall of the test box 1, and is used to measure the amount of fuel in the inner box.

[0047] like Figure 4 As shown, the heater 3 is plug-in type, the heating temperature can be adjusted, and the root has an internal thread, which is screwed to the heating interface 22 to maintain stable installation.

[0048] The pressure gauge 6 is connected to the inner box body to measure the pressure inside the inner box body, and is a universal electronic display pressure gauge for water, gas and oil.

[0049] like Figure 5 As shown, the lower part of the sealing cover 7 is an annular mounting platform that matches the pressure relief valve mounting interface 17, and the two are fixedly connected by bolts 12 and nuts 13. The bottom of the sealing cover 7 is provided with a sealing ring mounting groove for arranging the sealing ring 14 to achieve a sealed connection. The top of the sealing cover 7 is provided with an external threaded interface, which is connected to the hose assembly 8.

[0050] The hose assembly 8 is a hose with outer sleeve threads at both ends. One or two hose assemblies 8 are used according to the test needs. When one hose is used, one end is connected to the sealing cover 7 and the other end is connected to the upstream interface of the flow meter 10. When two hoses are used, on the basis of connecting the sealing cover 7 and the flow meter 10 at both ends, the two hoses are connected by an adapter joint 9 (such as Figure 6 Connect the air filter to be tested.

[0051] like Figure 7As shown, the plug cap 11 is a screw-in plug cap with an external thread on the top, and a sealing ring installation groove at its root. A corresponding sealing ring 14 is arranged in the groove, which is used to seal the interface as needed during the test or non-test process to ensure the sealing of the test system. The interface includes: a test medium addition interface 16, a sedimentation valve installation interface 19 and a downstream interface of the flow meter 10.

[0052] like Figure 3 As shown, the bracket 2 is a circular bracket with a notch, and the test box 1 is installed on the bracket 2.

[0053] A test method for aircraft fuel system equipment is implemented based on the above test device, and the test method includes a sedimentation valve, a pressure relief valve and an air filter test method. Specifically:

[0054] The operation methods of the various tests of the sedimentation valve are as follows:

[0055] Step 1: Install a plugging cap 11 downstream of the flow meter 10 to seal the pressure relief valve all the way to maintain the sealing of the test device.

[0056] Step 2, place the test device on a flat area, remove the plug cap 11 at the installation interface 19 of the sedimentation valve, and install the sedimentation valve to be tested on the installation interface 19 of the sedimentation valve using a specified torque;

[0057] Step 3, adding aviation fuel to the inner box of the test device through the test medium adding interface 16. The amount of aviation fuel added should meet the test requirements, and the amount of fuel added should be recorded;

[0058] Step 4, for the room temperature sealing test of the sedimentation valve, use a pressurizing device to pressurize the test device through the pressurizing interface 15. When the pressure gauge 6 shows the expected pressure value, operate the pressurizing device to ensure the internal pressure of the test device is stable. After maintaining the pressure for the time required by the test, observe whether there is fuel leakage at the installation place of the sedimentation valve and the valve body itself. After the test, exhaust through the exhaust hole 23.

[0059] For the high-temperature sealing test of the sedimentation valve, water is added to the outer container of the test device to a suitable height through the heating interface 22, and then the heater 3 with adjustable heating temperature is installed on the heating interface 22. After the heating is powered on, the fuel temperature is observed to be stable at 85°C through the thermometer 5 and maintained for a time that meets the test requirements; the test device is pressurized through the pressurizing interface 15 using a pressurizing device. When the pressure gauge 6 shows the expected pressure value, the pressurizing device is operated to ensure that the internal pressure of the test device is stable. After the pressure is maintained for the time required by the test, observe whether there is fuel leakage at the installation place of the sedimentation valve and the valve body itself. After the test, exhaust is exhausted through the exhaust hole 23.

[0060] For the oil discharge flow test of the sedimentation valve, open the sedimentation valve to the open position and record the amount of fuel reduced within the specified time.

[0061] The operating methods of the various tests of the pressure relief valve are as follows:

[0062] Step 1: Install the plugging cap 11 on the installation interface 19 of the sedimentation valve to achieve sealing and maintain the sealing of the test device.

[0063] Step 2: remove the sealing cover 7 and install the pressure relief valve to be tested on the pressure relief valve installation interface 17.

[0064] Step 3, for the pressure relief valve sealing test, apply foam around the pressure relief valve to be tested, use a pressurizing device to pressurize the test device through the pressurizing interface 15, pressurize to the required test pressure value and maintain it, observe whether there are bubbles in the foam around the device, if there are no bubbles, it proves that the sealing of the device meets the requirements under this pressure, and exhaust through the exhaust hole 23 after the test.

[0065] For the pressure relief valve opening pressure test, apply foam around the pressure relief valve to be tested, use a pressurizing device to slowly pressurize the test device through the pressurizing interface 15 until bubbles are observed around the pressure relief valve, observe the reading on the pressure gauge 6, which is the opening pressure of the pressure relief valve, and exhaust through the exhaust hole 23 after the test.

[0066] For the pressure-flow test of the pressure relief valve, the sealing cover 7 is sealed and connected with the pressure relief valve installation interface 17, and the plugging cap 11 of the downstream interface of the flow meter 10 is removed; the test device is slowly pressurized through the pressurizing interface 15, and after pressurizing to the opening pressure of the pressure relief valve, the test pressure value is increased step by step according to the test requirements, and the corresponding flow data of the flow meter 10 is recorded, and finally a pressure-flow curve is drawn. After the test, the air is exhausted through the exhaust hole 23.

[0067] The operating methods of the air filter tests are as follows:

[0068] Step 1: Install the plugging cap 11 on the installation interface 19 of the sedimentation valve to achieve sealing and maintain the sealing of the test device.

[0069] Step 2, remove the hose assembly 8 and the flow meter 10 from the sealing cover 7, use another hose assembly 8 to connect one end of the air filter to be tested through the adapter 9, and connect the other end to the sealing cover 7, and then connect the air filter to be tested to the hose assembly 8 removed from the sealing cover 7 through the adapter 9, and use thread sealing tape at the threaded connection to ensure the sealing of the test device.

[0070] Step 3, for the air filter sealing test, keep the downstream interface of the flow meter 10 still blocked by the plugging cap 11, place the hose assembly 8 connected to the sealing cover 7 and the air filter to be tested in a sink filled with water, and pressurize the test device to the pressure value required by the test through a pressurizing device, and observe whether there are bubbles in the air filter to be tested and the connection with the hose assembly 8. If no bubbles are generated, it proves that the equipment is well sealed. After the test, exhaust is discharged through the exhaust hole 23.

[0071] For the air filter pressure-flow test, the plugging cap 11 of the downstream interface of the flow meter 10 is removed, and the test device is pressurized step by step through the pressurizing equipment according to the test requirements, and the value of the flow meter at each pressure level is recorded. Finally, the pressure-flow curve is drawn to complete the test. After the test, the air is exhausted through the exhaust hole 23.

[0072] The above-described embodiments merely express the implementation methods of the present invention, but they should not be understood as limiting the scope of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A test device for aircraft fuel system equipment, characterized in that: The test device comprises a test box (1), a bracket (2), a heater (3), an oil gauge (4), a temperature gauge (5), a pressure gauge (6), a sealing cover (7), a hose assembly (8), a connecting joint (9), and a flow meter (10); The test box (1) is a double-layer box, wherein the inner box is used to add aviation fuel, and the outer box is formed between the inner and outer boxes and is used to add water; the top box cover area of ​​the test box (1) is provided with a pressurizing interface (15), a test medium adding interface (16), a pressure relief valve installation interface (17), a pressure gauge installation interface (18), a heating interface (22) and an exhaust hole (23), wherein the test medium adding interface (16) is used to add aviation fuel to the inner box, the pressure gauge installation interface (18) is used to install a pressure gauge (6), and the heating interface (22) is used to install a heater (3), and at the same time serves as a water injection interface for the outer box. The pressure relief valve installation interface (17) is an annular installation platform, which is provided with two circles of bolt installation holes, the outer circle is used for sealing connection with the sealing cover (7), and the inner circle is used for installing the pressure relief valve to be tested; the bottom area of ​​the test box (1) is provided with a settling valve installation interface (19), a temperature gauge installation interface (20) and an oil meter communication interface (21), wherein the settling valve installation interface (19) is used for installing the settling valve to be tested, the temperature gauge installation interface (20) is used for installing the temperature gauge (5), and the oil meter communication interface (21) is used for installing the oil meter (4), and the oil meter (4) is installed on the outer wall of the test box (1); The lower part of the sealing cover (7) is an annular mounting platform matching the pressure relief valve mounting interface (17), the two are fixedly connected, and the bottom of the sealing cover (7) is provided with a sealing ring mounting groove for arranging the sealing ring (14) to achieve a sealed connection, and the top of the sealing cover (7) is provided with an external threaded interface connected to the hose assembly (8); The hose assembly (8) is a hose with outer sleeve threads at both ends. One or two hose assemblies (8) are used according to test requirements. When one hose is used, one end is connected to the sealing cover (7) and the other end is connected to the upstream interface of the flow meter (10). When two hose assemblies are used, on the basis of connecting the sealing cover (7) and the flow meter (10) at both ends, the two hose assemblies are connected to the air filter to be tested through an adapter joint (9).

2. A test device for aircraft fuel system equipment according to claim 1, characterized in that: The heater (3) is plug-in type, the heating temperature can be adjusted, and the root portion has an internal thread which is threadedly connected to the heating interface (22).

3. A test device for aircraft fuel system equipment according to claim 1, characterized in that: The test medium addition interface (16), the sedimentation valve installation interface (19) and the downstream interface of the flow meter (10) are blocked by a plugging cap (11) as needed. The plugging cap (11) is a screw-in plugging cap with an external thread on the top, and a sealing ring installation groove at its root, in which a corresponding sealing ring (14) is arranged.

4. A test device for aircraft fuel system equipment according to claim 1, characterized in that: The test device also includes a bracket (2), which is a circular bracket with a notch, and the test box (1) is installed on the bracket (2).

5. A test method for aircraft fuel system equipment, implemented based on a test device for aircraft fuel system equipment according to any one of claims 1 to 4, characterized in that: The experimental methods include sedimentation valve, pressure relief valve and air filter test methods; specifically: The operation methods of the various tests of the sedimentation valve are as follows: Step 1, block the pressure relief valve all the way to maintain the sealing of the test device; Step 2, placing the test device on a flat area, and installing the sedimentation valve to be tested on the sedimentation valve installation interface (19) using a specified torque; Step 3, adding aviation fuel to the inner box of the test device through the test medium adding interface (16), the amount of aviation fuel added should meet the test requirements, and the amount of fuel added is recorded; Step 4, for the normal temperature sealing test of the sedimentation valve, use a pressurizing device to pressurize the test device through the pressurizing interface (15). When the pressure gauge (6) reaches the expected pressure value, operate the pressurizing device to ensure that the pressure inside the test device is stable. After maintaining the pressure for the time required by the test, observe whether there is fuel leakage at the installation of the sedimentation valve and the valve body itself; For the high temperature sealing test of the sedimentation valve, water is added to the outer container of the test device to a suitable height through the heating interface (22), and then the heater (3) with adjustable heating temperature is installed on the heating interface (22), and the heating is powered on. After the fuel temperature is stabilized at 85°C and maintained for a time that meets the test requirements, the test device is pressurized using a pressurizing device through the pressurizing interface (15). When the pressure gauge (6) reaches the expected pressure value, the pressurizing device is operated to ensure that the pressure inside the test device is stable. After the pressure is maintained for the time required by the test, the installation of the sedimentation valve and the valve body itself are observed to see if there is any fuel leakage. For the oil discharge flow test of the sedimentation valve, open the sedimentation valve to the open position and record the amount of fuel reduced within the specified time; The operating methods of the various tests of the pressure relief valve are as follows: Step 1, plugging the sedimentation valve installation interface (19) to maintain the sealing of the test device; Step 2, remove the sealing cover (7), and install the pressure relief valve to be tested on the pressure relief valve installation interface (17); Step 3, for the pressure relief valve sealing test, apply foam around the pressure relief valve to be tested, use a pressurizing device to pressurize the test device through the pressurizing interface (15), pressurize to the required pressure value of the test and maintain it, observe whether there are bubbles in the foam around the device, if there are no bubbles, it proves that the sealing of the device meets the requirements under this pressure; For the pressure relief valve opening pressure test, apply foam around the pressure relief valve to be tested, use a pressurizing device to slowly pressurize the test device through the pressurizing interface (15) until bubbles are observed around the pressure relief valve, and observe the reading on the pressure gauge (6), which is the opening pressure of the pressure relief valve; For the pressure-flow test of the pressure relief valve, the sealing cover 7 is sealed and connected to the pressure relief valve mounting interface (17), and the downstream interface of the flow meter (10) is unblocked; Use a pressurizing device to slowly pressurize the test device through a pressurizing interface (15) until the pressure reaches the opening pressure of the pressure relief valve, then gradually increase the test pressure value according to the test requirements, and record the corresponding flow data of the flow meter (10), and finally draw a pressure-flow curve; The operating methods of the air filter tests are as follows: Step 1, plugging the sedimentation valve installation interface (19) to maintain the sealing of the test device; Step 2, remove the hose assembly (8) and the flow meter (10) from the sealing cover (7), use another hose assembly (8) to connect one end of the air filter to be tested through the adapter (9), and connect the other end to the sealing cover (7), and then connect the air filter to be tested to the hose assembly (8) removed from the sealing cover (7) through the adapter (9), and use thread sealing tape at the threaded connection to ensure the sealing of the test device; Step 3, for the air filter sealing test, keep the downstream interface of the flow meter (10) blocked, place the hose assembly (8) connected to the sealing cover (7) and the air filter to be tested in a water tank filled with water, pressurize the test device to the pressure value required by the test through a pressurizing device, and observe whether there are bubbles in the air filter to be tested and the connection with the hose assembly (8). If no bubbles are generated, it proves that the equipment is in good sealing condition; For the air filter pressure-flow test, the downstream interface of the flow meter (10) is unblocked, and the test device is pressurized step by step through the pressurizing equipment according to the test requirements, and the value of the flow meter at each pressure level is recorded. Finally, a pressure-flow curve is drawn to complete the test.

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