Fisher 1805 Series relief valves are designed for use in farm tap applications where a relief valve is needed between the first-stage and second-stage regulators.

Fisher Type 1808 and 1808A are economical, compact devices used in gas or liquid service to maintain pressure on oil and gas separators, and in pressure relief applications in gas distribution systems.

Fisher Type 630R is frequently used at compressor stations, refineries and similar plants requiring a backpressure gas regulator for relief pressure settings up to 250 psig / 17,2 bar and is available in both high-pressure and low pressure constructions.

Fisher Type 63EG-98HM pilot operated relief valve or backpressure regulator is used for gas or liquid applications.

Fisher 98 Series is used for backpressure or relief applications in liquid, gas, air, and steam service.

Type MR108 backpressure regulators are direct-operated, high-capacity, multi-purpose regulators. They are designed to handle pressures up to 400 psig / 27,6 bar and temperatures up to 250°F / 121°C.