Wafer check valve

A wafer check valve is a short-body non-return valve installed between pipeline flanges. Forward differential pressure moves its disc away from the seat; when flow slows or reverses, the disc returns to prevent backflow. Its compact face-to-face length and lower installed weight distinguish it from full-bodied check valves where space and piping support matter. Disc arrangement, spring option, mounting orientation, pressure loss, and exposure to pulsating flow must be checked for the actual service rather than assumed from the wafer body style alone.