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Instantly add the Model 25 Reversing Relay and 50,000+ more product series to your store or catalog  
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Fairchild Pneumatic Reversing Relay, 25

Model 25 Reversing Relay

Brand: Fairchild Industrial Products
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Fairchild Pneumatic Reversing Relay, 25 Fairchild Pneumatic Reversing Relay, 25 Fairchild Pneumatic Reversing Relay, 25 Fairchild Pneumatic Reversing Relay, 25 Fairchild Pneumatic Reversing Relay, 25
The Rotork Fairchild 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.
Features
  • Control Sensitivity of 1/8" water column
  • 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

1 - 2 of 2 Part Numbers
25433E
25433E
FAIRCHILD Model 25 Reversing Relay, 3/8" NPT, 0.5-30 psi
25462
25462
FAIRCHILD Model 25 Reversing Relay,1/4" NPT, 2-150 psi
1 - 2 of 2 Part Numbers

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Specifications

Brand

Actuator Type

  • Knob Adjust

Ambient Temperature Range

  • -40° to 93° C (-40° to 200° F)

BSP Connection

  • BSPP Female (Parallel)
  • BSPT Female (Tapered)

Elastomers

  • Buna-N on Dacron
  • Fluorocarbon (Viton)

Enclosure, Body Material

  • Aluminum

Exhaust Capacity - Relieving Units Only

  • 11 scfm (18.7 m³/hour)

Flow Capacity

  • 40 scfm (68 m³/hour)

Mounting

  • Panel Mount
  • Pipe

NPT Connection

  • 1/2” NPT Female
  • 1/4” NPT Female
  • 3/8” NPT Female

Pressure Range

  • bar: 0 to 0.7
  • bar: 0.03 to 2
  • bar: 0.1 to 4
  • bar: 0.15 to 10
  • kPa: 0 to 70
  • kPa: 10 to 400
  • kPa: 15 to 1,000
  • kPa: 3 to 200
  • psi: 0.5 to 30
  • psig: 1 to 60
  • psig: 2 to 150

Relief

  • Relieving

Sensitivity

  • < 1/8” WC (0.32 cm)

Signal or Output Pressure - Maximum

  • bar: 10
  • kPa: 1,000
  • psig: 150

Supply Pressure - Maximum

  • bar: 17
  • kPa: 1,700
  • psig: 250

Supply Pressure Effect

  • psig: 0.1 (bar: 0.007, kPa: 0.7) for a psig: 100 (bar: 7, kPa: 700) Change in Supply Pressure

Vent

  • Straight
  • Tapped Exhaust

Documentation

Data Sheets

Installation Instructions

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