POLYHEDRA

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:
HCFC (R22)
HFC (R134A, R32, R404A, R407C, R410A, R507)
HFO (R1234YF, R1234ZE)
HFO + HFC (R448A, R449A, R450A, R452A, R452B, R454A, R454B, R454C, R455A, R513A, R515A, R515B)
HC (R290, R600, R600A, R1270)