1, a specifications of the valve batch manufacturing, should entrust the official institutions to carry out the following performance test: (1) the opening and closing moment of the valve under the working pressure condition; ② The flow resistance coefficient of the valve under the condition of pipeline water delivery is tested.
2, the valve before leaving the factory should be tested: (1) the valve in the open condition, the valve body should bear the valve pressure value of two times the internal pressure detection; (2) The valve in the closed condition, both sides are subjected to 11 times the valve pressure value, no leakage; But the metal seal butterfly valve, leakage value is not greater than the relevant requirements.
2, the valve before leaving the factory should be tested: (1) the valve in the open condition, the valve body should bear the valve pressure value of two times the internal pressure detection; (2) The valve in the closed condition, both sides are subjected to 11 times the valve pressure value, no leakage; But the metal seal butterfly valve, leakage value is not greater than the relevant requirements.