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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 operating type and the same size as the entering pipe.
  • Globe style thru 24 inches shall be rated 250PSI WOG, have a Ductile Iron body (ASTM A-536 65-45-12),
  • 125# ANSI Flat Face Flanges, ASTM Type 316 Stainless Steel helical or conical spring for sizes 2" - 16",
  • ASTM Type 304 Stainless Steel spring for 18" - 24", 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.
  • Check valve to have a minimum open area in the body of 110% of the area of the entering or corresponding
  • pipe.
  • Valve is to operate silently in either vertical or horizontal positions, flow up or down.
  • Globe Style Check Valve shall be Pratt Series 821G as manufactured by the Henry Pratt Company.