The pneumatic - valve action is not stable

Air pressure is not stable. (1) compressor capacity is too small; (2) the pressure reducing valve failure. Pressure signal is not stable. (1) the control system of time constant ( T＝RC） Not appropriate; (2) the controller output is not stable. Stable air pressure, pressure is stable signal, but the action of pneumatic control valve is still unstable. (1) the locator produets amplifier of ball valve and the dirt of lax, special gas consumption increase would produce output volatility; (2) locator nozzle baffle amplifier of parallel, shutter not nozzle; (3) the output pipe, line leak; (4) actuators rigidity is too small; (5) motion of the valve stem friction resistance is big, with the contact parts are blocking phenomenon. The choice of the form of the choice of pneumatic - valve structure: steam flow control should choose single seat; Large diameter, large flow, low pressure difference occasions should choose butterfly valve, but at the moment, leakage is larger; When the medium to high pressure, should choose high pressure pneumatic control valve; To facilitate drainage, prevent the valve plug, optional Angle of pneumatic control valve; Heat exchanger of the water or water temperature regulation optional tee pneumatic control valve.