Riser check valve is a compact and rugged swing-type unit that allows water flow in one direction and prevents flow in the opposite direction. This valve is designed to minimize water hammer caused by flow reversal. It is mainly designed for use in the risers of wet type fire protection systems. The single clapper design features dual springs for non-slamming operation and the streamlined body and wide-open clapper design provide for low friction loss. This valve can be installed in the vertical or horizontal position and the EPDM rubber faced clapper provides a non-stick leak-tight seal.