For oil-injected, oil-lubricated screw compressors and other rotary compressors: toregulate the minimum oil pressure required for cooling and lubrication during start-up, off-load and when user ports are filly open.
The valve opens when the increasing pressure in the valve exceeds the adjusted opening pressure. Start opening pressure is already marked in the product label.
The minimum pressure valve begins to close, when the pressure at either valve inlet or valve outlet decreases to less than the opening pressure plus 1 to 1.5 bar.
• If the compressor is loading, the oil separator will be higher than the opening pressure
• If the compressor is idling, the oil separator will be maintained at approx the opening pressure
• It is shut tight, if the pressure at the valve inlet is lower than the pressure at the valve outlet by more than 0.5 to 1 bar.
• The non-return valve will close automatically if there is no air demand or the compressor is stopped.