What is the test medium when the valves on the ventilation system act as "system valves (fittings) before installation, visual inspection / pressure test records"?
Medium refers to the test when the water, air or oil to complete the various project testing.
Valve test medium is 5-40 clean gas (air or nitrogen) or liquid (water or gas).
When the valve leaves the factory, must carry on the essential inspection, in the test according to the normal procedure and the standard, guaranteed that the valve in transportation, the storage, the installment, the use, in the maintenance process will not be damaged, safeguards the equipment security.Valve test medium is 5-40 clean gas (air or nitrogen) or liquid (water or gas).Valve test pressure A program: when the allowable pressure of valve is greater than 350kPa, the test pressure is done by 350kPa, less than 350kPa, according to the allowable pressure difference. B program: according to the maximum working pressure of the valve to do. The test signal pressure shall ensure that the valve is closed.In the A program, the air lift valve actuator pressure is zero; the gas off valve actuator signal pressure for the input signal, the ceiling increased by 20KPa; two bit actuator actuator signal pressure should be the design specified value. In the B program, the actuator signal pressure is designed according to the specified value. The test medium should be required to join the flow valve, low pressure valve loss measurement device can be directly exported through the atmosphere or connect the export through the atmosphere, when the check valve before and downstream of the connecting pipe completely filled with medium before measuring the leakage.The number of bubbles per minute is measured with the outer diameter 6mm and the tube thickness 1mm. The pipe is submerged at 5-10mm depth. The surface of the pipe end shall be smooth, without chamfering and burr.
