Flange Insert (F1, F6, FP) check valves are the ultimate check valve to install in flanged piping systems. Often referred to as wafer check valves, they provide the simplest most economical way to install check valves in a piping system. The valve body helps position itself while bolts are being installed and tightened. Two gaskets are required instead of the one normally used in a flanged joint. See additional installation guidelines or consult the factory for more information.
These spring loaded check valves are designed to fit between two mating ANSI flanges. The “Spring Housing” designated by the “A” dimension (See: Size & Dimension table below) is designed to be inserted into the upstream pipe, thereby helping to center it in the pipe. Therefore, there must be clearance between the spring housing and the pipe or flange. Generally speaking, the Flange Insert check valve (F1) is designed for standard schedule pipe with Class 150 or 300 flanges; whereas, the (F6) valves are designed for schedule 80 pipe with Class 150, 300 or 600 flanges.
The Flange Insert check valve can also be used as a low-pressure relief valve or vacuum breaker by using the desired spring settings. Many valves in this series can be supplied with B16.34 certification.