ORVA regulating valves maintain a constant oil differential pressure.
AWP oil pressure control valves are mechanically operated regulating devices for maintaining constant differential pressure. Extreme conditions, such as the starting phase of the compressor unit, are also considered. The valves are of angle-type design and have flanges or welding ends. They consist mainly of a welded or forge body, a tight piston, a stem, a cover, a spring and a cap. The oil pressure control valve is located in a bypass between oil pump outlet and oil separator. The amount of oil fed to the compressor varies depending on operational conditions but is always less than the amount delivered by the oil pump. The excess oil is recirculated through the bypass (oil pressure control valve) to the oil separator. The oil pressure control valve keeps the differential pressure between oil pump outlet and oil separator nearly at a constant level. If the oil flow rate to the compressor drops the differential pressure will increase further opening the oil pressure control valve. If the oil flow rate to the compressor increases, the oil pressure control valve will close to the point where the differential pressure setting of the valve is reached again. Regulating the differential oil pressure between oil pump outlet and oil separator ensures a simple and constant oil supply to the screw compressor throughout its operating range. The valve seat is sealed by an O-ring seal. The flat or O-ring seal allows a defined depth of impression backed by a metal support.AWP oil pressure control valves are suitable for controlling the oil pressure in the oil circuit of screw-type refrigerant compressors. They comply with the technical regulations of the German Technical Control Board (TÜV).
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