97220 Back Pressure Check Valve

The S&J 97220 Back Pressure Check Valve uses a free swinging “pendulum” pallet design to provide maximum flow rates with a minimum pressure drop in low pressure gas control lines.

Installing the 97220 downstream of meters, regulators, or other gas control devices protects these devices from possible damage due to accidental reversal of the gas flow. A removable cover provides easy access to the pallet and seat which are both entirely removable from the body. The 97220 is made from lightweight aluminum components providing for easy installation.

The 97220 matches most common manufactures’ flange-to-flange dimensions which simplifies replacement of existing valves.

Its aluminum and stainless steel components withstand the severest of process environments. The S&J 97220 is especially designed for hydrogen sulfide and hot, wet methane which are the main components of digester gas streams in municipal waste water treatment facilities.


  • Eliminates Reverse Flow
  • Replaceable Pallet/Seat
  • Minimum Pressure Drop
  • Sizes 2″ Through 12″
  • Flanged or Threaded Connections

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