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The silent type check valve is built with stainless trim to give years of trouble free operation.
The silent type check valve can be installed in either horizontal or vertical pipelines that carry clean water or air. This valve is not intended to carry fluids containing solids such as raw sewage or wastewater. This valve is not suited for fluids that contain hazardous gases. The silent type check valve is designed to provide flow in the direction of the arrow marked on the outside nameplate, and instantaneously close upon sensing flow reversal. The nameplate will also indicate valve size, model number, working pressure and materials of construction.


  • Check valve shall be of the silent wafer type and the same size as the entering pipe.
  • Valves shall be the compact wafer style and have a pressure and temperature rating equal to or greater than
  • the pipeline in which they are installed. Compact wafer-silent style check valves thru 12 inches shall be rated
  • for 250PSI WOG for installation between ANSI Class 125 or Class 250 flanges, have a Ductile Iron body
  • (ASTM A-536 65-45-12), ASTM Type 316 Stainless Steel helical or conical spring, ASTM 304 Stainless Steel
  • valve seat with integral EPDM seat seal, ASTM Type 304 Stainless Steel dual guided disc (top and bottom),
  • Bronze (ASTM B584) guide bushing and type 304 Stainless Steel stem.
  • Valves are to operate silently in either vertical or horizontal positions, flow up or down.
  • Compact wafer-silent check valve shall be Pratt Series 720G as manufactured by the Henry Pratt Company.