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Model 25 Reversing Relay

Brand: Fairchild
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
show more
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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Displaying prices & availability for Illinois, United States 60608 in USD. Change location or currency.

Models matching criteria: 3
25433E
FAIRCHILD Model 25 Reversing Relay, 3/8" NPT, 0.5-30 psi view more
  • 254: Model 25 Reversing Relay
  • 3: Pressure Range: 0.5-30 psig, 0.03-2 Bar, 3-200 kPa
  • 3: Pipe Size 3/8" NPT
  • E: Tapped Exhaust
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Materials of Construction
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N & Dacron
1 In Stock
$1,046.31 USD
25463
FAIRCHILD Model 25 Reversing Relay, 3/8" NPT, 2-150 psi view more
  • 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
6 - 8 weeks
$830.60 USD
25462
FAIRCHILD Model 25 Reversing Relay,1/4" NPT, 2-150 psi view more
  • 254: Model 25 Reversing Relay
  • 6: Pressure Range: 2-150 psig, 0.15-10 bar, 15-1000 kPa
  • 2: 1/4" NPT Pipe Size
  • Supply Pressure (Maximum): 250 psig, 17.5 bar, 1750 kPa
  • Ambient Temperature: -40°F to +200°F (-40°C to 93.3°C)
  • Materials of Construction
    • Body: Aluminum
    • Trim: Stainless Steel, Brass, Aluminum
    • Diaphragms: Buna N and Dacron
Out of Stock
$830.60 USD
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Specifications

Brand

Pressure Range

  • 0-10 psig : 0-0.7 bar : 0-70 kPa
  • 0.5-30 psig : 0.03-2 bar : 3-200 kPa
  • 1-60 psig : 0.1-4 bar : 10-400 kPa
  • 2-150 psig : 0.1-10 bar : 15-1000 kPa

Pipe/Port Size

  • 1/4"
  • 3/8"
  • 1/2"

Pipe/Port Thread Type

  • NPT
  • BSPP
  • BSPT

Max. Supply Pressure

  • 250 psig : 17.0 bar : 1700 kPa

Flow Capacity

  • 40 scfm (68 m³/hr) @ 100 psig, 7.0 bar, 700 kPa supply & 20 psig, 1.5 bar, (150 kPa) setpoint.

Supply Pressure Effect

  • Less than 0.1 psig : 0.007 bar : 0.7 kPa for a 100 psig : 7.0 bar : 700 kPa change in supply pressure.

Exhaust Capacity

  • 11 scfm (18.7 m³/hr) where downstream pressure is 5 psig : 0.35 bar : 35 kPa above setpoint.

Max. Signal or Output Pressure

  • 150 psig : 10 bar : 1000 kPa

Sensitivity

  • 1/8" W.C. : 0.31 mbar : 0.031 kPa

Ambient Temperature Limits

  • -40° F to +200° F (-40° C to 93.3° C)

Tapped Exhaust Vent

  • Tapped

Body & Housing Material

  • Aluminum

Elastomers Material

  • Viton (Fluorocarbon)

Diaphragm Material

  • Buna-N on Dacron

Trim Material

  • Aluminum, Brass, Stainless Steel

Mounting Style

  • Line/Pipe Mount
  • Panel Mount

Actuator Type

  • Knob Adjust

BSP Connection

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

Supply Pressure Effect

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

Exhaust Capacity - Relieving Units Only

  • 11 scfm (18.7 m³/hour)

Relief

  • Relieving

NPT Connection

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

Sensitivity

  • < 1/8 inH₂O (0.32 cm)

Enclosure, Body Material

  • Aluminum

Elastomers

  • Buna-N on Dacron
  • Fluorocarbon (Viton)

Supply Pressure - Maximum

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

Ambient Temperature Range

  • -40° to 93° C (-40° to 200° F)

Mounting

  • Panel Mount
  • Pipe

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

Vent

  • Straight
  • Tapped Exhaust

Flow Capacity

  • 40 scfm (68 m³/hour)

Signal or Output Pressure - Maximum

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