水压试验, 或液压试验, is done to test the strength of your fire extinguisher and detect any leaks or defects of the unit. 在水压试验中, the extinguishing agent is discharged from the unit so the cylinder shell can be tested.
一旦出院, the shell is filled with water or oil and then pressurized to detect any drops in pressure that could indicate a leak in the cylinder.
气缸测试完毕后, the unit is put back together and refilled with the proper extinguishing agent.