The Wafer Insert check valve is designed to fit between two mating ANSI Class 150 through 1500 flanges and fits inside the bolt circle for simple installation and reliable service.
.125 PSI springs are not recommended for installations with flow vertical down.
Seat materials other than “metal-to-metal” have a maximum pressure rating of 1500 PSI. “Metal-to-Metal” and PTFE seats are not resilient. See allowable leakage (New window will open).