Fairchild Model 25

Fairchild Model 25

Reversing Relay Model 25

The Model 25 Reversing Relay is designed for applications requiring an output that equals a manually preset spring load minus a variable signal pressure. This high quality unit combines excellent sensitivity with unusually high flow capacity. The Model 25 is ideally suited for a variety of precision control applications, including converting direct acting valves to reverse action, controlling opposite acting valves from a single transmitter, and cushioning cylinder loads. The basic mathematical expression for the Model 25 is PO = K - PS where PO is output pressure, PS is signal pressure and K is the spring constant.


  • Control Sensitivity of 5 mbar.
  • Balanced supply valve.
  • Aspirator tube design.
  • Separate control chamber isolates.
  • Unit construction.

  • Allows for use in high precision applications.
  • Minimizes the effects of supply pressure variation.
  • Compensates for output pressure droop under flow conditions.
  • Isolates the diaphragm from the main flow to eliminate hunting and buzzing.
  • Allows servicing without removal from air line.

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