Val-Matic Check ValvesVal-Matic Valve & Mfg. Corp. has added more check valves to its list of valves certified to NSF/ANSI 61 for Drinking Water System Components. Dual Disc Check Valves in sizes 14 inches and larger and Silent Check Valves with lead-free bronze and stainless steel trim are now certified to NSF/ANSI 61. The Dual Disc Check Valve has a compact design and features non-slam spring-assisted closure. The Silent Check Valve features a short linear stroke and spring-return action to close the valve before flow reversal can occur, effectively eliminating surges and water hammer. –