97150 Single Port Regulator

The S&J 97150 Single Port Back Pressure Regulator is a back pressure regulator with solenoid or thermally operated shut-off capabilities. The back pressure regulator function maintains a preset upstream pressure in low pressure (typically 2” – 8” w.c.) biogas lines such as those leading to flares and waste gas burners. Its normal operating position is closed until the set point is exceeded.

A large spring-loaded diameter diaphragm reduces line bounce for smoother gas flow. Field adjustment of set point is easily done by changing position of the spring with visual pointer indicator. The components are easy to access providing for simplified cleaning and maintenance. When external sense line is used, the 1/2” NPT connection on the lower diaphragm housing should be connected a minimum of 10 feet upstream from the regulator. The diaphragm-direct regulator can be ordered in two setting ranges: standard and high, which are defined for a given line size. The back pressure regulator’s second function is to positively shutoff gas flow in emergency flame conditions when combined with a solenoid controlled sense line or fusible element.

This unit can be used alone or combined with a Flame Trap Assembly. If installed indoors, the vent connection should be piped outdoors. A 97200 Flame Check should be installed by the end of the vent line for flashback protection.

Standard materials of construction include an aluminum body with an aluminum pallet and stainless steel internals. The diaphragm is Nylon Reinforce Buna-N.

Its aluminum and stainless steel components withstand the severest of process environments. The S&J 97150 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.


  • External Sense or Internal Sense
  • Large Diaphragm Operated/Spring Loaded for Sensitivity
  • Maintain Upstream Pressure
  • Simplified Cleaning and Maintenance
  • Sizes 2” Through 12”
  • 3-Way Solenoid Option Available
  • 3-Way Solenoid with Manual Bypass Option Available
  • Horizontal Configuration Only

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