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Model 81 Multi-Stage Precision Pressure Regulator

Brand: Fairchild Industrial Products
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The Rotork Fairchild Model 81 is a high flow two-stage precision pressure regulator designed for applications that require high performance, low droop and accurate process control.

The Model 81 combines a pilot control system with a basic force balance system to provide accurate output pressure regulation for both highly sensitive instrumentation and control circuits and in equipment requiring high flow with precise control.

The Fairchild Model 81 features control sensitivity of less than 0.1" water column, very low consumption and high accuracy to deliver consistent and reliable precision accuracy to maintain your desired set point regardless of supply pressure changes or conditions.

The Fairchild Model 81 pneumatic regulator will handle a 250 psi,17 BAR maximum supply pressure and offers five (5) output pressure ranges from 0-20 psi, 0-1.5 BAR, 0-150 kPa up to 1-100 psi, 0.05-7 BAR, 7-700 kPa.

The Model 81 precision regulator has a flow capacity of 50 SCFM,136 m3/hr.
Features
  • Sensitivity of less than 0.1" water column
  • Force balance and 2 stage pilot control
  • High flow capacity
  • Sapphire Orifice
  • Low air consumption
  • Available in 1/4" NPT port size
The Rotork Fairchild Model 81 is a high flow two-stage precision pressure regulator designed for applications that require high performance, low droop and accurate process control.

The Model 81 combines a pilot control system with a basic force balance system to provide accurate output pressure regulation for both highly sensitive instrumentation and control circuits and in equipment requiring high flow with precise control.

The Fairchild Model 81 features control sensitivity of less than 0.1" water column, very low consumption and high accuracy to deliver consistent and reliable precision accuracy to maintain your desired set point regardless of supply pressure changes or conditions.

The Fairchild Model 81 pneumatic regulator will handle a 250 psi,17 BAR maximum supply pressure and offers five (5) output pressure ranges from 0-20 psi, 0-1.5 BAR, 0-150 kPa up to 1-100 psi, 0.05-7 BAR, 7-700 kPa.

The Model 81 precision regulator has a flow capacity of 50 SCFM,136 m3/hr.
Features
  • Sensitivity of less than 0.1" water column
  • Force balance and 2 stage pilot control
  • High flow capacity
  • Sapphire Orifice
  • Low air consumption
  • Available in 1/4" NPT port size
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Specifications

Brand

Actuator Type

  • Tamper-Proof

Air Consumption

  • Maximum

Ambient Temperature Range

  • -40° to 93° C (-40° to 200° F)

BSP Connection

  • 1/4” BSPT Female

Diaphragm Material

  • Nitrile on Dacron

Enclosure, Body Material

  • Die Cast Aluminum

Exhaust Capacity - Relieving Units Only

  • 5.5 scfm (9.4 m³/hour)

Exhaust Port

  • Tapped Exhaust

Media

  • Compressed Air
  • Gas

Mounting

  • Bonnet Mounting

NPT Connection

  • 1/4” NPT Female

Orifice Material

  • Sapphire

Output Pressure - Maximum

  • bar: 7
  • kPa: 150
  • psig: 100

Pressure Range

  • bar: 0 to 0.15
  • bar: 0 to 0.35
  • bar: 0 to 1.5
  • bar: 0.035 to 4
  • bar: 0.035 to 7
  • kPa: 0 to 15
  • kPa: 0 to 150
  • kPa: 0 to 35
  • kPa: 3.5 to 400
  • kPa: 3.5 to 700
  • psig: 0 to 2
  • psig: 0 to 20
  • psig: 0 to 5
  • psig: 0.5 to 100
  • psig: 0.5 to 60

Sensitivity

  • > 0.1” WC (0.254 cm)

Supply Pressure - Maximum

  • bar: 7
  • kPa: 700
  • psig: 100

Supply Pressure Effect

  • > 0.2 psig (0.13 bar, 150 kPa) for 100 psig (7 bar, 700 kPa) Change

Trim Material

  • Aluminum
  • Plated Steel
  • Stainless Steel

Vent

  • Straight
  • Tapped Exhaust
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