The provisions of the pneumatic valve safety check! How safe pneumatic valve check!

security pneumatic valve check
according to the safety rules of the pneumatic valve safety technology provides the
security pneumatic valve check regularly, generally at least once a year, have corresponding safety technical specifications from its provisions;
when meet the following basic conditions, calibration cycle can be appropriately extended, put together according to the corresponding safety technical norms
a clear historical record, that is to protect equipment safe and reliable use of pneumatic valve
be protected equipment operation of the process conditions for stable
security aerodynamic trim material not corrode
security pneumatic valve online inspection and online testing all conform to the requirements of the use of
have perfect emergency plan
if conform to the above conditions can apply for an extension, parking equipment can check on the calibration device.
to regular inspection of related processing rules are not recommend consulting your local quality and technical supervision department of special equipment inspection institutions.
how safe pneumatic valve check
( ） Pneumatic safety valve in the 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.
（ ） On the gas test bench, by adjusting the applied load on the pneumatic valve 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 gas 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 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 level, online adjustment, safety protection measures.
（ ） Calibration process, personnel shall be recorded in a timely manner. Calibration qualified security pneumatic valve, after installed the attachment device should be seal, in order to prevent the change has adjust good state.
security after pneumatic valve action, not return because this security pneumatic valve was damaged. Have to replace or remove the maintenance, and calibration!