1, the relief valve pressure test and gas tightness test should be done before installation, to test the strength of the relief valve and seal performance. After qualified for correction and adjustment. 2, on the gas test bench, by adjusting the applied load on the disc to adjust the relief valve opening pressure. Lever type relief valve to adjust heavy hammer position, adjust the volume of the spring compression spring safety valve. Open the pressure relief valve in accordance with the rules of the boiler and pressure vessel safety technology of the relevant provisions. 3, on the container, by adjusting the clearance between the disc and safety valve adjusting ring, to adjust the relief valve discharge pressure and back pressure. If relief valve in the open only leakage under the pressure jump or jump but pressure drop after the violent vibration and 'buzz' sound, is a big gap, should be adjusted too. If the back pressure is too low, is the adjusting ring gap is too small, should be the appropriate. Steam in the discharge pressure of the relief valve should be less than or equal to the opening pressure of 1. 3 times, opening and closing pressure difference should be not more than 10% of the opening pressure. Air or other gas in the discharge pressure of the relief Industrial Valves should be less than or equal to 1 opening pressure. 10 times, opening and closing pressure difference is not more than 15% of the opening pressure. 4, check valve and pressure adjustment, must have a unit using supervisor boiler pressure vessels safety and technical personnel, the precision of the adjustment and calibration device with a pressure gauge shall be not less than 1 level, online adjustment, safety protection measures. 5, calibration process, check personnel shall be recorded in a timely manner. Safety valve, and calibrated after installed the attachment device should be seal, in order to prevent the change has adjust good state.
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