Seal Test Of Valve Test Equipment

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1. Valve sealing test of valve excitation test device

①Clamp the tested valve, and its "sealing pressure" value is calculated according to the "pressure comparison table" based on different valve diameters and pressure calculation formulas.

②Open the pressure relief valve and turn on the switch of the low-pressure water pump until water flows out from the pressure relief port, close the opening and closing parts of the valve under test, until the pointer of the pressure gauge pointer

start to act and turn off the low-pressure water pump.

③Press the "Boost" switch, and then turn the "Pressure Adjustment" knob clockwise to make the reading of the test pressure gauge reach the value to be measured, turn on the "holding pressure timer" switch. After the set time, the "buzzer" starts to warn of damage.

④We judge whether the tested valve is qualified by the pressure drop during the test.

⑤After the test is over, turn on the "pressure relief switch" to reset the test pressure gauge to zero. Then turn the counterclockwise "pressure adjustment" knob to make the system pressure less than 0.5MPa.

⑥Press the "Release" button, turn the "Pressure Adjustment" knob clockwise to loosen the valve under test, then turn the "pressure adjustment" knob counterclockwise to make the system pressure less than 0.5MPa.

⑦. Take away the valve being tested. So far, the inspection of the valve has been completed.

2. The valve excitation testing machine is used to test the strength of the valve housing and the sealing performance of the upper seal

①Select the corresponding sealing disc according to the measured valve diameter and connection form.

②Place the tested valve on the lower sealing plate and align it. Then press the "Clamp" button to clamp the measured object

valve. Calculate the clamping force according to the comparison table and formula.

③Unscrew the valve opening and closing parts; open the left pressure and pour water into the tested valve door until the water flows out from the pressure relief port. Then close the pressure relief valve.

④The test procedure is the same as the "valve sealing test".

3. Airtightness test of valve excitation testing machine

①Open the back door of the box, open the water-gas switching valve and connect the gas path. Note:

During the water pressure test, the water and gas on-off valve must be closed.

②Turn off the "pressure relief" switch.

③Connect medium gas source (nitrogen) and power gas source(Compressed air) to the gas booster pump respectively.

④Turn on the "Medium Gas Switch" first, and then turn on the "power gas Switch" after the pressure rises to conduct a stress test. If it is lower than the pressure of the nitrogen cylinder, just open the "medium gas switch" slowly " to perform a pressure test. We judge whether the test valve is qualified by the pressure drop during the test duration. (If there are high and low-pressure test pressure gauges installed on the operation panel, the use of high and low-pressure gauges helps to improve the measurement accuracy at low pressure. But it must be

noted: When the test pressure is greater than 2/3 of the range, the switch of the low-voltage meter must be turned off to prevent damage to the low-voltage meter. )

⑤After the test is completed, open the pressure relief switch to complete the pressure relief.

⑥Press the "release" button and turn the "Pressure Adjustment" knob clockwise to loosen the tested valve.

Then turn the "pressure adjustment" knob counterclockwise to make the system pressure less than 0.5MPa, remove it

valve.