How to detect the pneumatic actuator air tightness

pneumatic actuator air tightness test is mainly check the connection parts whether there is a leak phenomenon, so how to detect the pneumatic actuator's air tightness? The pneumatic actuator air tightness detection method has two kinds: the test pressure of the pneumatic actuators, reach the test pressure, then the air supply cut off, with a stop valve test membranes observed header pressure change, within the prescribed period of time, pressure drop values shall not exceed the specified value. , will test the pneumatic actuator air chamber pressure to test, then daub on the seal, with soap and water can't leak air bubbles. In the process of air tightness test of, need to check the following seal:, the joint of membrane cover up and down and thin film; Connection tray, spacing pieces, and film seal; , O ring seal; And each air chamber wall, the welding points. Above is the detection method of pneumatic actuator air tightness and needs the seal.