Exchange the complete unit when maintenance is required. MTTR < 10 minutes.
ABB’s PCV consist of two diaphragms. Between these diaphragms there is a port used for leakage control. If the 'fluid-diaphragm' is defect, the leakage will be observed in the hose connected to this port, before the 'air-diaphragm' may break - causing fluid to contaminate the air system.
The PCV is all stainless steel construction, with TeflonTM membranes, suitable for all water borne and solvent based materials on the market.