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Model 25 Reversing Relay

Brand: Fairchild Industrial Products
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
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1 - 17 of 17 Part Numbers
2533AE
2533AE
FAIRCHILD Model 2500A Biasing Reversing Relay, 0.5-30 psig, 3-200 kPa, 3/8" NPT, Tapped Exhaust

Overview

  • Set Point Range: 0.5-30 psig, 0.03-2 bar, 3-200 kPa
  • Supply Pressure (Maximum): 250 psig, 17 bar, 1700 kPa
  • Pipe Size: 3/8" NPT
  • Options:
    • Tapped Exhaust  
  • Materials of Construction:
    • Body & Housing: Aluminum
    • Trim: Zinc Plated Steel, Brass
    • Diaphragms: Nitrile on Dacron 
25432
25432
FAIRCHILD Model 25 Reversing Relay, 0.5-30 psig, 3-200 kPa, 1/4" NPT

Overview

  • Set Point Range: 0.5-30 psig, 0.03-2 bar, 3-200 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/4" NPT
  • Pipe Thread: NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N & Dacron
25432E
25432E
FAIRCHILD Model 25 Reversing Relay, 0.5-30 psig, 3-200 kPa, 1/4" NPT, Tapped Exhaust

Overview

  • Set Point Range: 0.5-30 psig, 0.03-2 bar, 3-200 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/4" NPT
  • Pipe Thread: NPT
  • Options:
    • Tapped Exhaust   

  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N & Dacron

25433
25433
FAIRCHILD Model 25 Reversing Relay, 0.5-30 psig, 3-200 kPa, 3/8" NPT

Overview

  • Set Point Range: 0.5-30 psig, 0.03-2 bar, 3-200 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 3/8" NPT
  • Pipe Thread: NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N & Dacron
25433E
25433E
FAIRCHILD Model 25 Reversing Relay, 0.5-30 psig, 3-200 kPa, 3/8" NPT, Tapped Exhaust

Overview

  • Set Point Range: 0.5-30 psig, 0.03-2 bar, 3-200 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Pipe Size: 3/8" NPT
  • Options: Tapped Exhaust
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Aluminum, Stainless Steel, Brass
    • Diaphragms: Buna N and Dacron
2543A
2543A
FAIRCHILD Model 2500A Biasing Reversing Relay, 1-60 psig, 10-400 kPa, 3/8" NPT

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17 bar, 1700 kPa
  • Pipe Size: 3/8" NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Zinc Plated Steel, Brass
    • Diaphragms: Nitrile on Dacron
2543AE
2543AE
FAIRCHILD Model 2500A Biasing Reversing Relay, 1-60 psig, 10-400 kPa, 3/8" NPT, Tapped Exhaust

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17 bar, 1700 kPa
  • Pipe Size: 3/8" NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Zinc Plated Steel, Brass
    • Diaphragms: Nitrile on Dacron
25442
25442
FAIRCHILD Model 25 Reversing Relay, 1-60 psig, 10-400 kPa, 1/4" NPT

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/4" NPT
  • Pipe Thread: NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N & Dacron
25442E
25442E
FAIRCHILD Model 25 Reversing Relay, 1-60 psig, 10-400 kPa, 1/4" NPT, Tapped Exhaust

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/4" NPT
  • Pipe Thread: NPT
  • Options
    • Tapped Exhaust

  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron

25442H
25442H
FAIRCHILD Model 25 Reversing Relay, 1-60 psig, 10-400 kPa, 1/4" BSPP (Parallel)

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/4" NPT
  • Pipe Thread: NPT
  • Options
    • BSPP (H)

  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron

25443
25443
FAIRCHILD Model 25 Reversing Relay, 1-60 psig, 10-400 kPa, 3/8" NPT

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 3/8" NPT
  • Pipe Thread: NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N & Dacron
25443E
25443E
FAIRCHILD Model 25 Reversing Relay, 1-60 psig, 10-400 kPa, 3/8" NPT, Tapped Exhaust

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 3/8" NPT
  • Pipe Thread: NPT
  • Options:
    • Tapped Exhaust
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron
25444E
25444E
FAIRCHILD Model 25 Reversing Relay, 1-60 psig, 10-400 kPa, 1/2" NPT, Tapped Exhaust

Overview

  • Set Point Range: 1-60 psig, 0.1-4 bar, 10-400 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/2" NPT 
  • Pipe Thread: NPT
  • Options:
    • Tapped Exhaust
    • 1/2" NPT In/Out Connection

  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron

25462
25462
FAIRCHILD Model 25 Reversing Relay, 2-150 psig, 15-1000 kPa, 1/4" NPT

Overview

  • Set Point Range: 2-150 psig, 0.15-10 bar, 15-1000 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/4" NPT
  • Pipe Thread: NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron

25463
25463
FAIRCHILD Model 25 Reversing Relay, 2-150 psig, 15-1000 kPa, 3/8" NPT

Overview

  • Set Point Range: 2-150 psig, 0.15-10 bar, 15-1000 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 3/8" NPT
  • Pipe Thread: NPT
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron

25463E
25463E
FAIRCHILD Model 25 Reversing Relay, 2-150 psig, 15-1000 kPa, 3/8" NPT, Tapped Exhaust

Overview

  • Set Point Range: 2-150 psig, 0.15-10 bar, 15-1000 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 3/8" NPT
  • Pipe Thread: NPT
  • Options:
    • Tapped Exhaust
  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragm: Buna N and Dacron
25464U
25464U
FAIRCHILD Model 25 Reversing Relay, 2-150 psig, 15-1000 kPa, 1/2" BSPT (Tapered)

Overview

  • Set Point Range: 2-150 psig, 0.15-10 bar, 15-1000 kPa
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Pipe Size: 1/2" NPT
  • Pipe Thread: NPT
  • Options: "U"
    • BSPT (Tapered)

  • Materials of Construction:
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragm: Buna N and Dacron

1 - 17 of 17 Part Numbers

Model 25

Base Model

Port Size

Port Thread

Exhaust Port

Elastomers

Specifications

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
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