The calibrated valves are used where it is necessary to require a differential pressure between the oil reservoir and the compressor crankcase. This differential pressure allows the level oil regulator to be met.
Accessories for use with the following ASHRAE 34:2019 refrigerants, Class A1, A2L, or A3:
Maximum allowable pressure PS = 45 bar and 80 bar.
Allowable temperatures TS = -40 / +150 °C