Pneumatic valve performance testing 1 valve batch manufacturing a certain specification, the authority should be entrusted to perform the following performance testing: â‘ valve under pressure in the opening and closing torque conditions; â‘¡ under pressure conditions, to ensure that the valve is closed tight Continuous opening and closing times; â‘¢ valve in the pipeline water flow resistance coefficient of detection. 2 valve in the factory should be the following test: â‘ valve in the open condition, the valve body should withstand pressure twice the internal pressure detection; â‘¡ the valve is closed, both sides are subject to 1.1 times the valve pressure , No leakage; but the metal seal butterfly valve, the leakage value is not greater than the relevant requirements.