Security pneumatic valve discharge pressure and back pressure how to adjust

the first thing to know what is the safety of the pneumatic valve discharge pressure, what is the safety of the pneumatic valve seat back pressure. Security pneumatic valve discharge pressure is pneumatic disc reach regulation when opening suction side pressure. Back pressure pneumatic valve is safe after discharge, back pressure pneumatic pneumatic valve seat valve, inlet pressure of medium to stop discharging. By its security under the pneumatic valve technical personnel for the safety and security to interpret pneumatic valve discharge pressure and back pressure how to adjust and relevant points for attention.
security pneumatic valve discharge pressure and back pressure how to adjust?
and safe pneumatic valve pressure test and gas tightness test should be done before installation, to test the strength and security of pneumatic valve sealing performance, after qualified for correction and adjustment.
and on the gas test bench, by adjusting the applied load on pneumatic valve pneumatic control valve disc to adjust security pneumatic valve opening pressure. Leveraged security pneumatic valve to adjust heavy hammer position, adjust the volume of the spring compression spring loaded safety pneumatic valve. Safety of the pneumatic valve opening pressure should comply with the rules of the boiler and pressure vessel safety technology of the relevant provisions.
, on the container, by adjusting the pneumatic valve adjusting ring and pneumatic valve clearance, to adjust the security of the pneumatic valve discharge pressure and back pressure. If the security of pneumatic valve in the open under pressure leakage not only 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 with the security, the discharge pressure of the pneumatic valve should be less than or equal to the opening pressure. Times, opening and closing pressure difference should not be greater than the opening pressure of %. Air or other gases with the security, the discharge pressure of the pneumatic valve should be less than or equal to the opening pressure. Times, opening and closing % of differential pressure is not greater than the opening pressure.
, security check pneumatic valve and pressure adjustment, must have a competent unit using the boiler pressure vessels safety and technical personnel is present, the precision of adjustment and calibration device with a pressure gauge shall be not less than level, online adjustment, safety protection measures.
spring type pneumatic valve lever type safety and emissions must be noticed when the adjustment of the pressure and back pressure, the disc holder and pneumatic seat adjust the structure of ring, is the use of pneumatic seat adjustment circle for adjustment. Unscrewed the adjusting ring fixed screw, from revealing the screw hole and a thin iron tools, such as can a dial to adjust the ring gear, make adjustment circle turn right or left. When the adjusting ring has a counterclockwise to the left, the higher position, discharge pressure and back pressure will be reduced.