SFV 20 - 25 are standard, back pressure dependent safety relief valves in angle-way execution, specially designed for protection of vessels and other components against excessive pressure.The valve is designed to meet the strict quality demands and safety requirements for refrigeration installations, specified by the international classification societies.The valve is recommended as an external and internal safety relief valve in refrigeration plants. The spring housing is closed tightly to avoid refrigerant leakage. The inlet flow diameters of the valves are:• 18 mm (3⁄4 in.) for SFV 20• 23 mm (1 in.) for SFV 25The valves can be delivered with set pressures between 10 and 25 bar (145 and 363 psig).Standard pressure setting valves having "TÜV Pressure Setting Certificate" with each valve, are also available.