Fairchild Model 14

Fairchild Model 14

Positive and Negative Bias relay Model 14


Designed for applications that require an output pressure that is the sum of a controlled input signal plus or minus a fixed bias, Fairchild's Model 14 Biasing Pneumatic Relay provides versatility in its ability to provide either positive or negative biasing in a single unit. The output of the Model 14 relay is the sum of the spring bias, set with the Range Screw, plus a pneumatic input signal. (Po = Ps ± K); where Po is output pressure, Ps is signal pressure, and K is the combined spring constant.


  • Control sensitivity of 1/2" water column.
  • Balanced Supply Valve.
  • Aspirator Tube design.
  • Separate Control Chamber.
  • Mounting Bracket available
  • CRN certification.

  • Allows use in precision applications.
  • Minimizes the effects of supply pressure variation.
  • Minimizes downstream pressure droop under flow conditions.
  • Isolates the diaphragm from the main flow to eliminate hunting and buzzing.
  • Easy to install in the field
  • Certification for use in all Canadian territories and provinces

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