This device is a universal water heating valve detection device. The FM-B valve testing equipment is a specialized testing device used in conjunction with pipe testing equipment, which has the advantages of small size, simple and reasonable structure, and easy operation.
2. Purpose and Scope of Application
FM-B valve testing equipment is suitable for flange type valves and internally threaded valves
Testing of the following content:
a. Shell test;
b. Sealing test;
c. Upper sealing test: This equipment is suitable for testing medium: water.
3. Model Description
a. Model: FM-B

4Structure:

The detection equipment is mainly composed of

1. Console; 2. Leakage testing cabinet; 3. Flange fixtures; Components such as testing aids.

This equipment is used in conjunction with pressure resistant equipment for pipes.
a. Console:
According to national standards, valves should not be subjected to external forces that may affect the test results during the testing process. Therefore, this test bench adopts a vertical installation of the test piece. The two ports of the test piece are sealed separately, without external forces affecting the test results, making installation convenient and easy to operate.
b. Test cabinet:
The testing cabinet is mainly used for displaying leakage volume. The reading is clear and intuitive.
5. Configuration and parameter table

2、 Experimental project description
1Test pressure: The calculated pressure that the inner cavity of the specimen should withstand during the test.
The specific pressure value should be determined based on the nominal pressure index of the specimen and the corresponding national standards.
2. Shell test:
For valves, it refers to the pressure test conducted on the entire valve shell formed by the connection of the valve body and valve cover. The purpose is to test the tightness of the valve body and valve cover, as well as the pressure resistance of the entire shell including the connection between the valve body and valve cover.
3. Sealing test:
Test for inspecting the sealing performance of opening and closing components and valve sealing pairs (see relevant standards for test pressure).
4. Upper sealing test: a test to verify the sealing performance of the valve stem and valve cover sealing pair.
3、 Operating procedures
Valves with a diameter of DN10-100mm (1/2 "-4") can be installed and tested on the control panel. a. Installation of flange type valves
Fix the flange type testing aid (bottom) and valve flange on the operating table with bolts (seal the flange between them with O-ring seals)
The upper part of the valve flange is tightened with testing aids (upper) through bolts (sealed between flanges with O-rings). There is a quick change connector fixed in the middle of the upper auxiliary equipment.
b. Installation of internal threaded valves
Secure the internal thread type valve testing fixture onto the operating table using threads. Screw the valve directly onto the threads of the fixture. (Seal the threads with sealing tape). Simply screw the auxiliary tool (upper) into the upper end of the valve. There is a quick change connector fixed in the middle of the upper auxiliary equipment.
After the tested valve is installed, insert the high-pressure hose into the quick change connector at the leakage detection inlet.

Connect the water pressure source to the main pressure inlet of the equipment through a high-pressure hose, and open the pressure switch manual valve.
Experimental methods and steps
Generally, the upper sealing test and shell test are conducted first, followed by the sealing test
1Upper sealing test
With the above pipelines and test specimens connected, the leakage detection switch is turned on. The leakage drainage switch is closed, and all other valves are in the open state.
At this point, loosen the packing gland of the test valve (if the valve is equipped with an upper seal inspection device and the performance of the upper seal can be reliably checked without loosening the packing gland, there is no need to loosen the packing gland). The test valve is fully open, causing the upper seal to close.
Turn on the pressure test pump, and at this time, the pressure water passes through the main pressure inlet, the inlet pressure switch manual valve, the test piece, the high-pressure hose, the leakage detection inlet, the leakage detection switch manual valve, the leakage measuring tube, and the gas in the system is first discharged. When water is discharged from the leakage detection tube, turn off the leakage detection switch, gradually increase the pressure to the specified test pressure, and continue for a period of time (according to the standard time), and then check the sealing performance.
2Shell test
After the above experiment, release a portion of the pressure and tighten the packing gland to maintain the test pressure. The valve opening and closing components are partially open, gradually pressurized to the test pressure, and then the shell (including the packing box and the connection between the valve body and the valve cover) is inspected.
4.3 Sealing Test
Firstly, place the pressure test pump in a low-pressure operating state.
a. Open the leakage detection switch manual valve to raise the liquid level of the leakage measuring tube to a certain height
b. Close the valve opening and closing components of the test subject tightly (with normal force)
c. Turn on the leakage drainage switch to keep the liquid level of the leakage measuring tube at a lower position. After the liquid level stabilizes, record the initial scale value of the liquid level.
d. Pressurize to the specified pressure and continue for a certain period of time (according to standard regulations) to close the leakage drainage switch. Record the scale value of the leakage measuring tube at the end.
evaluating index
1The shell test, upper sealing test, and sealing test are all conducted in accordance with the GB/T13927 standard.
2. Calculation of liquid leakage:
The leakage indication value of this detection equipment is 0.1ml per small grid. If the liquid level rises to n grids, the total leakage amount is V=0.1xn (ml).
Equipment maintenance and upkeep
This equipment is a non powered device, and the pressure water used for the equipment is provided by the pressure pump of the pipe testing equipment, so maintenance is relatively simple.
a. Regularly check whether the valves and their connections of the equipment are leaking, and if there is any leakage, replace the sealing gasket in a timely manner.
b. Regularly keep the equipment clean and wipe off any surface water (leaked during testing).
c. The accumulated water in the water tank should be drained regularly, especially in winter, to prevent the water tank from freezing and cracking.
d. After the experiment is completed, the water in the leakage glass tube should be drained in a timely manner for the next test.