A dual filtration system consists of a coarse filter of felt on steel gauze followed by a fine ceramic filter with a pore diameter of 15 to 20 mm ensures that minimal fatigue debris reaches the contact area. The temperature of the oil leaving the test washer contact zone is measured by means of thermocouples situated in the oil throwout path. The oil condition-viscosity, acidity, moisture content, specific gravity, and particle content-is monitored regularly and maintained within strict limits.
Dual Flow Vacuum Valve is limited by a small orifice. These are used only in non-porous parts or for slightly porous lightweight parts. It uses a blow-off pulse of compressed air to break the vacuum and release the part more quickly. The non-sealing cups will leak and cause the associated dual-flow valves to close to orifice flow only.