direct-operated relief valve

Fisher 98 series backpressure or relief valves are versatile and provide stable regulation. The regulators come in a compact design and can handle varied degrees of pressure. Equipped with capabilities to service sour gas and possessing top-class fluid compatibility, Fisher 98 series can be used in liquid, gas, air, and steam service. 98L, 98H and 98HH, are available in stainless steel and cast iron bodies, are direct-operated and spring-loaded.

Types 98LD and 98HD utilize extra pressure loading for maintenance of pressures. In order to operate, Fisher 98 series requires no external power and in order to externally sense pressure, the regulator has a sensing line connection.