Dual-plate check valve

A dual-plate check valve divides the closure member into two semicircular plates hinged about a central axis. Forward flow opens the plates; in many designs, springs assist closure as velocity decays or reverses. Splitting a large disc reduces the mass and travel of each moving plate, supporting faster response and reduced slam compared with a single large swing disc. It is therefore a distinct construction, not merely another name for a single-disc wafer check valve. Flow velocity, pressure loss, orientation, and system transients still require project-specific review.