Airtightness test: Pressurize with compressed air at 1.5 times the working pressure and hold for 5 minutes - no leakage is considered qualified;
Pressure resistance test: pressurize with nitrogen gas at twice the working pressure and hold for 1 minute - the shell has no deformation or cracks;
Explosion proof label inspection: Confirm that the explosion-proof label (such as Ex d IIB T4 Gb), model, and manufacturer on the solenoid valve are clearly identifiable for subsequent maintenance
Functional testing: Power on to test the action of the solenoid valve and check for any jamming or abnormal noise - ensuring that the explosion-proof structure does not affect the control performance.