Higher Pressure Selector Relay (M90)

Lower Pressure Selector Relay (M90)

The Model 90 Low Pressure Selector Relay is designed to select the lower of two signal pressures to provide a continuous output pressure to a control device. The Model 90 is recommended for dead end or low flow service in critical applications such as control loops requiring precise, automatic monitoring of signal pressures.


  • Small, rugged design
  • Soft seat construction
  • Low selection differential
  • Fast response
  • Automatic switching


  • Suitable for installation where space is limited
  • Assures positive shutoff
  • Allow precise control of switching function
  • Well suited for control in critical loops
  • Eliminates manual monitoring of signal pressure

See PUB103-072 for further information.

Lower Pressure Selector Relay (M90)