Valve pressure testing device and testing method thereof

Abstract

The present application provides a valve pressure testing device and a testing method thereof, which relate to the field of valve testing. It comprises an air source output device and a testing fixture, wherein the air source output device is connected to the front end of the testing fixture via an air intake pipe, and the rear end of the testing fixture is provided with an exhaust pipe connected to the outside world; both the air intake pipe and the exhaust pipe are provided with a thermocouple for temperature measurement and a pressure gauge for pressure measurement, the air intake pipe is provided with a safety valve, and the exhaust pipe is provided with a manual valve; the testing fixture is used to clamp the valve to be tested. The present application has the effect of improving the testing efficiency of the valve to be tested.

Description

Technical Field

[0001] The present application relates to the field of valve testing, and in particular to a valve pressure testing device, and further to a valve pressure testing method. Background Art

[0002] Valves are pipe accessories used to open and close pipes, control flow direction, and adjust and control the parameters (temperature, pressure, and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. As important components of fluid control, valves are widely used in many fields such as petroleum, chemical industry, and water treatment.

[0003] During the production and use of valves, pressure tests are required to ensure their sealing and working stability. Existing valve pressure testing devices mostly use a single pressure testing mode. For different types of valves and different testing requirements, the testing efficiency and accuracy need to be improved. Summary of the invention

[0004] In order to improve the problem of low testing efficiency of existing valve testing devices, the present application provides a valve pressure testing device and a testing method thereof.

[0005] In a first aspect, the present application provides a valve pressure testing device and a testing method thereof, which adopt the following technical solutions:

[0006] A valve pressure testing device comprises an air source output device and a testing tool, wherein the air source output device is connected to the front end of the testing tool via an air intake pipe, and the rear end of the testing tool is provided with an exhaust pipe connected to the outside world; both the air intake pipe and the exhaust pipe are provided with thermocouples for measuring temperature and pressure gauges for measuring pressure, the air intake pipe is provided with a safety valve, and the exhaust pipe is provided with a manual valve; the testing tool is used to clamp the valve to be tested.

[0007] By adopting the above technical solution, after the valve to be tested is clamped on the test fixture, the gas source output device, the air inlet pipe, the test fixture, the valve to be tested and the exhaust pipe are in a state of interconnection, and then the manual valve is closed and the gas source output device delivers the test gas to the valve to be tested. At this time, the valve to be tested is operated again to achieve the simulated use scenario, and then the temperature reading of the thermocouple and the pressure reading of the pressure gauge are observed to determine whether the valve to be tested is in a normal working state and whether there is any leakage, thereby directly, quickly and reliably judging the test result of the valve to be tested, effectively improving the diversity and efficiency of the test.

[0008] Optionally, the test tooling includes a support platform and a pair of shells disposed on the support platform, the pair of shells are both bowl-shaped and arranged opposite to each other, one of the shells is connected to the intake pipe, and the other of the shells is connected to the exhaust pipe; sealing rings are provided between one side of the valve to be tested and one shell, and between the other side of the valve to be tested and the other shell, and are both connected by bolts.

[0009] By adopting the above technical solution, the bowl-shaped shell is easy to connect with the valve to be tested. Under the locking action of the bolts and the sealing action of the sealing ring, the test gas output by the gas source output device will not leak from between the shell and the valve to be tested, thereby improving the accuracy of the test results.

[0010] Optionally, a hydraulic cylinder is provided on the support platform, and the hydraulic cylinder drives any one of the shells to move in a horizontal direction; a support mechanism is provided in each of the pair of shells, and the support mechanism is used to support the valve to be tested, and the support mechanism includes a support tube and a support head, and the support head is sleeved on the outside of the support tube, and the support head and the support tube are connected by a thread, and the support head is passed through the inner side of the valve to be tested, and the two support tubes are connected to the inner side of the valve to be tested.

[0011] By adopting the above technical solution, the hydraulic cylinder is used to adjust the distance between the two shells, so as to facilitate placing the valve to be tested between a pair of shells; by adjusting the support tube and the support head in the horizontal direction, the initial fixation of the valve to be tested can be achieved. After the shell and the valve to be tested are locked, the valve to be tested is reliably fixed between a pair of support heads, thereby further improving the reliability of the test.

[0012] Optionally, the support head is in a truncated cone shape, the maximum outer diameter of the support head is larger than the inner diameter of the valve to be tested, the minimum outer diameter of the support head is smaller than the inner diameter of the valve to be tested, a threaded hole is provided on the support head, and the support tube is adaptively screwed into the threaded hole.

[0013] By adopting the above technical solution, the support head can be rotated to adjust the relative position of the support head on the support tube, so that after the support tube is moved into place, the distance between the two support heads can be adjusted, so that the truncated cone-shaped support head can support valves of different sizes to be tested.

[0014] Optionally, one end of one of the support tubes is connected to one of the support heads, and the other end is inserted into the intake pipe; one end of another of the support tubes is connected to another of the support heads, and the other end is inserted into the exhaust pipe; the intake pipe, one of the support tubes, the valve to be tested, the other of the support tubes and the exhaust pipe are in a state of interconnection.

[0015] By adopting the above technical solution, it is ensured that the test gas output by the gas source output device can reliably increase the gas pressure in the test device, thereby ensuring that the test can be carried out reliably and accurate test data can be obtained.

[0016] Optionally, a containing box is provided at the bottom of the air intake duct and the exhaust duct, a slider is provided at the bottom of the support tube, the slider is inserted into the containing box, a magnet is movably provided on the outer side of the containing box, the magnet is attracted to the slider and drives the slider to slide in the containing box.

[0017] By adopting the above technical solution, after sliding the magnet on the outside of the accommodating box, the slider inside the accommodating box will move synchronously with the magnet, thereby realizing the driving effect on the support tube, thereby realizing the support and preliminary fixing effect of the support head on the valve to be tested on the outside of the shell.

[0018] Optionally, the accommodating box extends along the length direction of the air intake duct or the exhaust duct, and the accommodating box is made of non-magnetic material.

[0019] By adopting the above technical solution, the accommodating box will not be adsorbed by the magnet, and will not affect the adsorption and driving effect of the magnet on the slider. The extension direction of the accommodating box is limited, ensuring that the support tube and the support head can move in the horizontal direction.

[0020] Optionally, the test tooling also includes a conveyor chain and a placement table, the conveyor chain conveys the placement table to move in a horizontal direction, and the valve to be tested is arranged on the placement table; an air blowing mechanism is provided at the front end of the conveyor chain, and the air blowing mechanism includes a base and an inverted U-shaped gantry, the conveyor chain is laid on the top of the base and the support table, and both ends of the gantry are arranged on the base, and the gantry is provided with a plurality of air blowing heads for purging the valve to be tested, and the air blowing heads are connected to the exhaust pipe through an air pipe.

[0021] By adopting the above technical solution, the valve to be tested is placed on the placement table. Under the conveyor chain, the valve to be tested will first pass through the gantry and then move between a pair of shells. In the process of the valve to be tested passing through the gantry, the air blowing head on the gantry will form a purge effect on the valve to be tested, thereby blowing away the dust adhering to the surface of the valve to be tested, preventing the dust from affecting the air tightness between the test fixture and the valve to be tested. The air blowing head is connected to the exhaust pipe. When the exhaust pipe is exhausted, part of the test gas will enter the air blowing head through the air pipe, thereby realizing the reuse of exhaust gas and reducing the loss of test gas during the test process.

[0022] Optionally, a through hole is provided at both ends of the gantry, and an external gear and an internal gear are provided in each of the two through holes, the outer wall of the internal gear is connected to the inner wall of the through hole, and the external gear is arranged on the inner side of the internal gear and meshes with the internal gear; a pair of bearing seats are provided at both ends of the gantry, a rotating shaft is passed through the pair of bearing seats, the external gear is sleeved on the outer side of the rotating shaft and fixedly connected to the rotating shaft; an electric motor is also provided on the base, and the motor drives any of the rotating shafts to rotate between a pair of bearing seats.

[0023] By adopting the above technical solution, the gantry is rotatably connected to the base through the bearing seat and the rotating shaft. When the motor drives any rotating shaft to rotate, the gantry will swing on the base, thereby effectively increasing the purging time of the gantry on the valve to be tested, thereby improving the purging effect of the valve to be tested.

[0024] In a second aspect, the present application provides a valve pressure testing method, which adopts the following technical solution:

[0025] The valve pressure testing method, based on the valve pressure testing device, comprises the following steps:

[0026] S1. Clamp the valve to be tested on the test fixture and lock it;

[0027] S2. Close the manual valve, and the gas source output device delivers the test gas into the air inlet pipeline;

[0028] S3. Observe the temperature readings of the two thermocouples and the pressure readings of the two pressure gauges;

[0029] S4. Determine whether the valve to be tested is leaking based on the temperature reading and the pressure reading;

[0030] S5. Stop the gas supply from the gas source output device, open the manual valve to release the test gas in the air intake and exhaust pipes, open the test tooling and install the next valve to be tested.

[0031] By adopting the above technical solution, batch testing of valves to be tested can be achieved, effectively improving the testing efficiency.

[0032] In summary, this application has the following beneficial effects:

[0033] 1. By setting thermocouples for temperature measurement and pressure gauges for pressure measurement on both sides of the test fixture, and performing simulated operation on the valve to be tested during the test, the test is as close to the actual use scenario as possible, thereby improving the accuracy of the test.

[0034] 2. The valve to be tested is transported by the conveyor chain, and the valve to be tested is initially fixed by the support pipe and the support head, which facilitates the quick connection between the shell and the valve to be tested, ensures high air tightness between the shell and the valve to be tested, and improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic stereogram of the present application;

[0036] Figure 2 is a schematic stereogram of the test fixture;

[0037] Figure 3 It is a reference diagram of the explosion state of the supporting mechanism;

[0038] Figure 4 It is a reference diagram of the explosion state of the air intake duct and the containing box;

[0039] Figure 5 is a schematic stereogram of the air blowing mechanism;

[0040] Figure 6 It is a schematic stereogram of the gantry;

[0041] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0042] In the figure: 1. air source output device; 11. air compressor station; 12. air storage tank; 13. dryer; 14. heater; 2. test tooling; 21. support platform; 22. shell; 23. sealing ring; 24. bolt; 25. hydraulic cylinder; 26. support mechanism; 261. support pipe; 2610. slider; 262. support head; 2620. threaded hole; 27. conveyor chain; 28. placement table; 3. air intake pipe; 31. thermocouple; 32. pressure gauge; 33. safety valve; 34. storage box; 340. magnet; 4. exhaust pipe; 41. manual valve; 42. air pipe; 5. valve to be tested; 6. air blowing mechanism; 61. base; 62. gantry; 621. perforation; 622. external gear; 623. internal gear; 63. air blowing head; 64. bearing seat; 65. rotating shaft; 66. motor. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-7 This application is described in further detail.

[0044] Figure 1 is a schematic three-dimensional diagram of the present application. Figure 1, valve pressure testing device, gas source output device 1 and test fixture 2, the gas source output device 1 and the test fixture 2 are connected through an air intake pipe 3, the valve 5 to be tested is clamped on the test fixture 2, and the test fixture 2 is connected to the outside through an exhaust pipe 4. The gas source output device 1 includes a primary connected air compressor station 11, a gas storage tank 12, a dryer 13 and a heater 14. After the external test gas is pressurized, dried and heated by the gas source output device 1, the gas source output device 1 can deliver high-pressure and high-temperature test gas with a pressure of less than 10MPa and a temperature of 400°C to the valve 5 to be tested. A thermocouple 31 for temperature measurement and a pressure gauge 32 for pressure measurement are provided on the air intake pipe 3 and the exhaust pipe 4. A safety valve 33 is also provided on the air intake pipe 3. When the pressure in the air intake pipe 3 reaches a preset value, the safety valve 33 will automatically open and release the pressure. A manual valve 41 is also provided on the exhaust pipe 4. When testing, the manual valve 41 is in a closed state. After the test is completed, the manual valve 41 opens and discharges the test gas in the test fixture 2 and the air intake pipe 3 and the exhaust pipe 4.

[0045] Figure 2 It is a schematic three-dimensional diagram of the test tooling. Figure 3 This is a reference diagram of the exploded state of the support mechanism. Figure 2 and Figure 3 The test fixture 2 includes a support platform 21, a conveyor chain 27, a placement platform 28 and a pair of shells 22. The conveyor chain 27 is erected on the top of the support platform 21. The placement platform 28 with the valve 5 to be tested is arranged on the conveyor chain 27. The pair of shells 22 are located at the end of the conveyor chain 27 and are respectively located at both ends of the conveyor chain 27. A hydraulic cylinder 25 is provided on the support platform 21. The hydraulic cylinder 25 is used to drive one of the shells 22 to move, thereby increasing the distance between the two shells 22. In this way, the valve 5 to be tested is directly moved between the pair of shells 22 under the conveyance of the conveyor chain 27. A pair of shells 22 are both bowl-shaped and arranged opposite to each other, one shell 22 is connected to the intake pipe 3, and the other shell 22 is connected to the exhaust pipe 4. A supporting mechanism 26 is provided on the inner side of the pair of shells 22. Under the support of the supporting mechanism 26, the valve 5 to be tested can be separated from the placement table 28, and then the hydraulic cylinder 25 acts in the opposite direction to make the two shells 22 approach each other, and a sealing ring 23 is provided between one shell 22 and one side of the valve 5 to be tested and between the other shell 22 and the other side of the valve 5 to be tested. In this way, the valve 5 to be tested can be reliably connected between the pair of shells 22 after the bolt 24 is screwed in.

[0046] See also Figure 3The support mechanism 26 includes a support tube 261 and a support head 262. The support head 262 is sleeved on the outside of the support tube 261. The support head 262 and the support tube 261 are connected by threads. The support head 262 is inserted into the inner side of the valve 5 to be tested. The support head 262 is in a truncated cone shape. The outer diameter of the side of the support head 262 close to the valve 5 to be tested is smaller than the outer diameter of the side of the support head 262 away from the valve 5 to be tested. Moreover, the maximum outer diameter of the support head 262 is larger than the inner diameter of the valve 5 to be tested, and the minimum outer diameter of the support head 262 is smaller than the inner diameter of the valve 5 to be tested. When the support tube 261 moves in the horizontal direction, the support head 262 can be reliably inserted into the inner side of the valve 5 to be tested. One end of a support tube 261 is inserted into the intake pipe 3, and the other end is adaptively screwed into a threaded hole 2620 of a support head 262. One end of another support tube 261 is inserted into the exhaust pipe 4, and the other end is adaptively screwed into the threaded hole 2620 of another support head 262. Both support tubes 261 are connected to the inner side of the valve 5 to be tested.

[0047] Figure 4 This is a reference diagram of the explosion state of the air intake duct and the container. Figure 4 Combined with Figure 2 and Figure 3 A containing box 34 is provided at the bottom of the intake duct 3 and the exhaust duct 4. The top of the containing box 34 has an opening. The containing box 34 is in a long strip shape and extends along the length direction of the intake duct 3 or the exhaust duct 4. The containing box 34 and the intake duct 3 and the exhaust duct 4 can be an integrally formed structure or a welded structure, as long as the containing box 34 is connected to the intake duct 3 and the exhaust duct 4 and the connection is airtight. A slider 2610 is provided at the bottom of the support tube 261, and the slider 2610 is inserted into the receiving box 34. The outer wall of the slider 2610 is in contact with the inner wall of the receiving box 34, and a magnet 340 is provided on the outer side of the receiving box 34. The receiving box 34 is made of non-magnetic materials such as plastic or aluminum alloy. That is to say, the magnet 340 will only produce a magnetic attraction with the slider 2610, but not with the receiving box 34. In this way, when the magnet 340 slides on the outer side of the receiving box 34, the slider 2610 attracted by the magnet 340 can adaptively slide in the receiving box 34, thereby realizing the sliding of the support tube 261 in the intake duct 3 or the exhaust duct 4.

[0048] When the conveyor chain 27 drives the placement platform 28 and the valve to be tested 5 to move between a pair of shells 22, the valve to be tested 5 and the shell 22 are coaxial or nearly coaxial at this time, and then the sliding magnet 340 moves the support tube 261 toward the direction close to the valve to be tested 5. Since the outer diameter of the support head 262 facing the side of the valve to be tested 5 is smaller, the support head 262 can be smoothly inserted into the inner side of the valve to be tested 5 and the same support head 262 can adapt to multiple valves to be tested 5 with different inner diameters. Furthermore, the support head 262 and the support tube 261 are connected by threads, so that the relative position between the support head 262 and the support tube 261 can be adjusted, thereby realizing the adjustment of the length of the support mechanism 26, thereby improving the adaptability of the support mechanism 26 to valves to be tested 5 of different sizes.

[0049] After the two support heads 262 clamp the valve 5 to be tested, the hydraulic cylinder 25 moves in the opposite direction, so that the distance between the two housings 22 is reduced until the housing 22 and the valve 5 to be tested are docked (the sealing ring 23 is assembled during the docking process). In this way, after the bolt 24 is tightened, the air intake pipe 3, one support pipe 261, the valve 5 to be tested, the other support pipe 261 and the exhaust pipe 4 are in a state of interconnection, and the test gas can be delivered. When the test gas is delivered to the air intake pipe 3, the test fixture 2 and the exhaust pipe 4, the valve 5 to be tested can be operated to simulate the actual use scenario, and then the temperature reading of the thermocouple 31 and the pressure reading of the pressure gauge 32 are observed. If both remain unchanged, it means that the valve 5 to be tested does not have a gas leakage defect and the test meets the standard. If any one of the two changes, it means that the valve 5 to be tested has a defect and the test does not meet the standard. The test result is accurate and the test speed is fast, which effectively improves the test efficiency.

[0050] Figure 5 It is a schematic stereogram of the air blowing mechanism. Figure 6 is a schematic three-dimensional diagram of the gantry. Figure 5 and Figure 6 Combined with Figure 1 The test tooling 2 is arranged at the rear end of the conveyor chain 27, and an air blowing mechanism 6 is arranged at the front end of the conveyor chain 27. The air blowing mechanism 6 includes a base 61 and an inverted U-shaped gantry 62. The base 61 and the support platform 21 together form a support for the conveyor chain 27 (that is, the conveyor chain 27 is laid on the top of the base 61 and the support platform 21).

[0051] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at A in the middle. Figure 7In combination with the figure, a through hole 621 is provided at both ends of the gantry 62, and an inner gear 623 and an outer gear 622 are provided in the through hole 621. The inner gear 623 is annular, and the teeth of the inner gear 623 are provided on the inner wall of the inner gear 623. The outer wall of the inner gear 623 is fixedly connected to the inner wall of the through hole 621. The teeth of the outer gear 622 are provided on the outer wall of the outer gear 622. The outer gear 622 is provided on the inner side of the inner gear 623 and is in a state of mutual meshing with the inner gear 623. A pair of bearing seats 64 are provided at both ends of the gantry 62, and a rotating shaft 65 is provided between the pair of bearing seats 64. The outer gear 622 is sleeved on the outer side of the rotating shaft 65 and is fixedly connected to the rotating shaft 65. A motor 66 is also provided on the base 61, and the motor 66 drives any rotating shaft 65 to rotate between the pair of bearing seats 64.

[0052] See also Figure 5 and Figure 6 A plurality of air blowing heads 63 for blowing the valves 5 to be tested are arranged on the gantry 62, and the air blowing heads 63 are connected to the exhaust pipe 4 through the air pipe 42. When a valve 5 to be tested is tested in the test fixture 2, another valve 5 to be tested is placed on the placement table 28. When the test of a valve 5 to be tested is completed and the manual valve 41 is ready to be opened, the conveyor chain 27 starts to move, so that the placement table 28 with the other valve 5 to be tested and the empty placement table 28 are moved forward. The empty placement table 28 is used to receive the valve in the test fixture 2 that has been tested. When the conveyor chain 27 is transporting the placement table 28, the manual valve 41 is opened to release the test gas in the test tooling 2. Part of the test gas will be directly discharged through the exhaust pipe 4, and another part will be transported to the air blowing head 63 on the gantry 62 through the air pipe 42. In this way, when the placement table 28 equipped with another valve 5 to be tested passes through the gantry 62, the air blowing head 63 on the gantry 62 will purge the valve 5 to be tested, thereby removing dust and other debris on the valve 5 to be tested, thereby improving the air tightness between the valve 5 to be tested and the shell 22, and then improving the accuracy of the test results.

[0053] The valve pressure testing method, based on the valve pressure testing device, comprises the following steps:

[0054] S1, clamp the valve 5 to be tested on the test fixture 2 and lock it;

[0055] S2, close the manual valve 41, and the gas source output device 1 delivers the test gas into the gas inlet pipe 3;

[0056] S3, observe the temperature readings of the two thermocouples 31 and the pressure readings of the two pressure gauges 32;

[0057] S4, judging whether the valve 5 to be tested is leaking according to the temperature reading and the pressure reading;

[0058] S5, the gas source output device 1 stops supplying gas, opens the manual valve 41 to release the test gas in the air inlet pipe 3 and the exhaust pipe 4, opens the test tool 2 and installs the next valve 5 to be tested, and the process is completed.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. Valve pressure testing device, characterized in that: It comprises an air source output device (1) and a test fixture (2), wherein the air source output device (1) is connected to the front end of the test fixture (2) via an air intake pipe (3), and the rear end of the test fixture (2) is provided with an exhaust pipe (4) connected to the outside; The air intake pipe (3) and the air exhaust pipe (4) are both provided with a thermocouple (31) for measuring temperature and a pressure gauge (32) for measuring pressure, the air intake pipe (3) is provided with a safety valve (33), and the air exhaust pipe (4) is provided with a manual valve (41); The testing tool (2) is used to clamp the valve to be tested (5); The test fixture (2) comprises a support platform (21) and a pair of shells (22) arranged on the support platform (21); the pair of shells (22) are both bowl-shaped and arranged opposite to each other; one of the shells (22) is connected to the air intake pipe (3), and the other of the shells (22) is connected to the air exhaust pipe (4); A sealing ring (23) is provided between one side of the valve to be tested (5) and one housing (22), and between the other side of the valve to be tested (5) and another housing (22), and both are connected by bolts (24); A hydraulic cylinder (25) is provided on the support platform (21), and the hydraulic cylinder (25) drives any one of the housings (22) to move in a horizontal direction; A support mechanism (26) is provided in each of the pair of shells (22). The support mechanism (26) is used to support the valve to be tested (5). The support mechanism (26) comprises a support tube (261) and a support head (262). The support head (262) is sleeved on the outside of the support tube (261). The support head (262) and the support tube (261) are connected via threads. The support head (262) is inserted into the inside of the valve to be tested (5). Both support tubes (261) are connected to the inside of the valve to be tested (5).

2. The valve pressure testing device according to claim 1, characterized in that: The support head (262) is in the shape of a truncated cone, the maximum outer diameter of the support head (262) is larger than the inner diameter of the valve (5) to be tested, and the minimum outer diameter of the support head (262) is smaller than the inner diameter of the valve (5) to be tested. The support head (262) is provided with a threaded hole (2620), and the support tube (261) is adaptively screwed into the threaded hole (2620).

3. The valve pressure testing device according to claim 1, characterized in that: One end of one of the support tubes (261) is connected to one of the support heads (262), and the other end is inserted into the air intake pipe (3); one end of another of the support tubes (261) is connected to another of the support heads (262), and the other end is inserted into the air exhaust pipe (4); The air intake pipe (3), one of the support pipes (261), the valve to be tested (5), another of the support pipes (261), and the exhaust pipe (4) are in a state of interconnection.

4. The valve pressure testing device according to claim 3, characterized in that: The bottom of the air intake duct (3) and the exhaust duct (4) are both provided with a receiving box (34); the bottom of the support tube (261) is provided with a slider (2610); the slider (2610) is inserted into the receiving box (34); a magnet (340) is movably provided on the outer side of the receiving box (34); the magnet (340) is attracted to the slider (2610) and drives the slider (2610) to slide in the receiving box (34).

5. The valve pressure testing device according to claim 4, characterized in that: The accommodating box (34) extends along the length direction of the air intake duct (3) or the air exhaust duct (4), and the accommodating box (34) is made of non-magnetic material.

6. The valve pressure testing device according to claim 1, characterized in that: The testing tool (2) further comprises a conveying chain (27) and a placing table (28), wherein the conveying chain (27) conveys the placing table (28) to move in a horizontal direction, and the valve to be tested (5) is arranged on the placing table (28); An air blowing mechanism (6) is provided at the front end of the conveying chain (27), and the air blowing mechanism (6) comprises a base (61) and an inverted U-shaped gantry (62). The conveying chain (27) is laid on the top of the base (61) and the support platform (21), and both ends of the gantry (62) are arranged on the base (61). The gantry (62) is provided with a plurality of air blowing heads (63) for blowing the valve to be tested (5), and the air blowing heads (63) are connected to the exhaust pipe (4) through the air pipe (42).

7. The valve pressure testing device according to claim 6, characterized in that: A through hole (621) is provided at both ends of the gantry (62), an external gear (622) and an internal gear (623) are provided in each of the two through holes (621), the outer wall of the internal gear (623) is connected to the inner wall of the through hole (621), and the external gear (622) is provided on the inner side of the internal gear (623) and meshes with the internal gear (623); A pair of bearing seats (64) are provided at both ends of the gantry (62), a rotating shaft (65) is passed through the pair of bearing seats (64), and the external gear (622) is sleeved on the outer side of the rotating shaft (65) and fixedly connected to the rotating shaft (65); The base (61) is also provided with a motor (66), and the motor (66) drives any one of the rotating shafts (65) to rotate between a pair of bearing seats (64).

8. A valve pressure testing method, based on the valve pressure testing device according to claim 1, characterized in that: The steps include: S1. Clamp the valve to be tested (5) onto the test fixture (2) and lock it; S2, closing the manual valve (41), and the gas source output device (1) delivers the test gas into the gas inlet pipe (3); S3, observing the temperature readings of the two thermocouples (31) and the pressure readings of the two pressure gauges (32); S4, judging whether the valve to be tested (5) is leaking according to the temperature reading and the pressure reading; S5. The gas source output device (1) stops supplying gas, the manual valve (41) is opened to release the test gas in the air inlet pipe (3) and the exhaust pipe (4), the test tool (2) is opened and the next valve to be tested (5) is installed, and the process is completed.

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