Data Sheet
The FE Petro 400988931 is a standard check valve replacement that holds and maintains pipeline pressure when the STP is off. It allows product flow when the STP is on. Integral to each check valve is a pressure relief valve. When the line pressure exceeds the pressure relief threshold it opens and bleeds pressure into the tank.
Key Features
Opens at about 40 PSI (2.8 bar)
Resets above 35 PSI (2.4 bar)
Typically used for Mechanical Line Leak Detectors (MLD) and some electronic line leak detectors (i.e., Incon, Emco Wheaton, and RJ ST)
Identified with Silver ID Nut