Pneumatic control valve leakage detection

test medium test medium shall be ℃ ℃ ~ clean gas ( Air or nitrogen) Or water.
test medium pressure
a test program, should be. MPa, when the pneumatic valve differential pressure is less than the allowed. MPa in design rules to allow the differential;
b test procedure, shall be the maximum working pressure difference of pneumatic valve.

test signal pressure pneumatic actuators should be adjusted to conform to the provisions of the working state, when the test procedure, and open adjust pressure pneumatic valve actuator signal should be zero; Gas closed type adjustment pressure pneumatic valve actuator signal should be add % input signal threshold value; Cut type regulating pneumatic valve actuator signal pressure should be design specified value. In the test procedure, the signal pressure shall be the design of the actuator specified value.
without a pneumatic actuator, pneumatic valve test shall attach a test with the thrust device, the force applied by the biggest pneumatic seat sealing force does not exceed the factory regulations. The flow direction of medium
test
the test medium shall be in accordance with the relevant provisions to join in the pneumatic valve, pneumatic valve can be connected through the atmosphere or export atmospheric low head loss measurement device, when confirm the connection on the lower reaches of pneumatic valve and pipe full medium leakage and steady in the rear measurable leakage.

leakage quantity measurement and pressure measurement errors of measurement error shall not exceed + % of reading values.