The internal pressure is 1.0 times of the working pressure. After the pressure is stable, hold the pressure for 10 minutes, the pressure drop is no more than 0.2MPa, and there is no leakage.
The internal pressure is 1.0 times of the working pressure, the pressure is kept for 10 minutes after the pressure is stable, and the pressure drop is less than 0.2Mpa, and no leakage is considered as qualified.