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Gate, Globe & Check Valves • Cast Iron

Figure 681 - Cast Iron Wafer Style Silent Check

Figure 681
Catalog Spec Sheet Spec Sheet for Figure 681
Drawings for Figure 681 — Wafer Style Silent Check
PDF drawing DWG drawing -- AutoCAD required to open  *AutoCAD required to open DWG (free download)
RFA drawing  *Autodesk's Revit or comparable software required to open RFA files

Always verify that you have the most recent product specifications
or other documentation prior to the installation of these products.
The FNW figure 681 silent check prevents flow reversal in pipelines, allowing flow in only the indicated direction. The spring backed disc closes the valve when flow ceases prior to pressure reversal, therefore reducing slam or water hammer.


  • 200 PSI Non-Shock
  • Temperature Range -4°F to 176°F (-20°C to 80°C)
  • Wafer Style
  • Non-Slam (Spring Actuated) Check for Water or Clean Fluids
  • Cast Iron Body, Aluminum Bronze & Stainless Steel Internal Components
  • Vertical or Horizontal Installation*
  • Replaceable Drip Tight Resilient Seat
  • Renewable Disc
  • Epoxy Coated Body
* Use Flat-Faced Metal Flanges and Full-Face gaskets only.

Not for Steam Service


  • Face to Face: MSS SP-125
  • Inspection & Test: API 598
  • Flange Drilling: ANSI B16.1 Class 125
  • Flange Face Finish: MSS SP-6
  • Markings: MSS SP-25

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