Circulation (Casing) Relief Valve UL Listed and FM Approved

The *Circulation Relief Valve (CRV)* is essential for electric motor-driven fire pumps because

it prevents overpressure, protects equipment, ensures system efficiency, and complies with

NFPA 20 standards. It relieves excess pressure during low-demand periods, preventing damage

to system components and reducing energy consumption. Overall, the CRV maintains the safety,

efficiency, and longevity of fire pump systems

UL Listed / ULC Listed  Pressure Relief Valve

Factory Mutual Approved

Fast Opening to Maintain Steady Line Pressure

Accommodates Wide Range of Flow Rates

Closes Gradually for surge-Free Operation

Adjustable Pressure Settings, Not Affected by 

Pressure at Valve Discharge

Specifications:

Globe: 2"-10" flanged     Angle: 2" -10" flanged

150 and 300 ANSI B16.42

Class 150-250 psi Max.     Class 300-300 psi Max

Water, to  180°F Max.

Main valve body & cover

Ductile Iron ASTM A536 Grade 65-45-12

Standard  Main Valve Trim: Bronze Seat, Teflon Coated Stainless Steel Stem, Dura-Kleen Stem

Standard Pilot Control System: Cast Bronze with Stainless Steel trim

Aailable in the following relief

Pressure ranges:

20~200 psi (150 Class)  100~300psi (300 Class)

Protective epoxy resin coating of wetted surfaces of main valve cast iron components 

(UL Listed HNFX EX2855)