mixing station compressor failures are

mixing station compressor failures are:
Check valve is damaged, badly worn piston rings, the intake valve is damaged and air filter blockage.
To determine whether the non-return valve damage, just ten seconds after the compressor automatically shut down, turn off the power, the hand plate moving large belt wheel, if can more easily turn a week, then the check valve is not damaged ; Stationary conacrete plant, non-return valve is damaged; Further, the pressure switch from automatic exhaust vent below the case to be judged, in general, after the air compressor should be shut down automatically after about ten seconds to stop the exhaust, If you have been in the exhaust until the compressor starts again when to stop, then the check valve is damaged, must be replaced.
When the pressure of the air compressor oil rises slowly and ready mix concrete plant string phenomenon that has been severely worn piston ring compressor, should be replaced.
When the intake valve is damaged or clogged air filter, but also make the air compressor pressure rises slowly (but no strings oil phenomenon). Checking, can be put to the palm of the air inlet filter, if the heated air out the top, then place the intake valve is damaged, must be replaced; if suction is small, usually caused by dirty air filters, Filters should be cleaned or replaced.