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