english 
Here are the common methods to test the
sealing performance of a stainless - steel pneumatic actuator:
Air Pressure Test
Positive Pressure Test: Connect the
actuator to a compressed air source and gradually increase the pressure to the
rated working pressure. Then, keep the pressure stable for a certain period,
usually 10 - 15 minutes. Use soapy water or a leak - detection agent to smear
on the joints, seals, and other parts of the actuator. If there are no bubbles,
it indicates that there is no air leakage and the sealing performance is good.
Negative Pressure Test: After the positive
pressure test, the pressure in the actuator can be reduced to a certain
negative pressure value. Seal the air inlet and outlet of the actuator and
observe whether the pressure gauge shows a pressure rise within a certain time.
If the pressure remains stable, it means that the actuator has good sealing
performance in a negative pressure environment.
Oil - Immersion Test
Immerse the actuator in an oil tank, and
apply a certain pressure to the inside of the actuator through an air -
pressure pipe. Observe whether there is oil seepage on the surface of the
actuator. If there is no oil seepage, it means that the sealing performance of
the actuator is reliable. This method is more suitable for detecting micro -
leaks that are difficult to find by the air - pressure test.
Dye - Penetrant Test
Apply a dye - penetrant liquid to the
surface of the actuator, and let it stand for a period of time to allow the
liquid to penetrate into possible cracks or gaps. Then, wipe off the surface
liquid and apply a developer. If there are any leakage points, the dye -
penetrant will be adsorbed by the developer, showing a colored mark, which can
help to accurately locate the leakage position.
If you want to learn more about low-priced products, please visit the following website: www.xm-valveactuator.com
