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Model 4900A Pneumatic Volume Booster

Brand: Fairchild Industrial Products
Rotork Fairchild’s M4900A is a High Flow Pneumatic Volume Booster designed for high precision applications.

With its Cv of 9 in both forward and exhaust modes, this pilot operated booster provides fast response, very low deadband and high precision control. 

In its pilot operated regulator design, the M4900A handles up 250 psig, [17.0 BAR], (1,700 kPa) supply pressure and delivers an output pressure up to 150 psig [10.0 BAR] (1,000 kPa).

The Fairchild Model 4900A Booster provides a flow capacity of 500 SCFM (850 m3/Hr), which equates to a Cv factor of approximately 9 in both forward and exhaust modes.
Features
  • Cv = 9; Flow capacity of 500 SCFM (850 m3/Hr)
  • Ratio Accuracy of 0.5%
  • Very low deadband between the operation of the supply valve and exhaust valve
  • High capacity exhaust valve
  • Large area diaphragms
  • Soft seat supply and exhaust valves
  • Pressure balanced supply valve
  • Damped diaphragm control chamber
  • Two accessory ports connected to the outlet chamber
  • Tapped exhaust port
Rotork Fairchild’s M4900A is a High Flow Pneumatic Volume Booster designed for high precision applications.

With its Cv of 9 in both forward and exhaust modes, this pilot operated booster provides fast response, very low deadband and high precision control. 

In its pilot operated regulator design, the M4900A handles up 250 psig, [17.0 BAR], (1,700 kPa) supply pressure and delivers an output pressure up to 150 psig [10.0 BAR] (1,000 kPa).

The Fairchild Model 4900A Booster provides a flow capacity of 500 SCFM (850 m3/Hr), which equates to a Cv factor of approximately 9 in both forward and exhaust modes.
Features
  • Cv = 9; Flow capacity of 500 SCFM (850 m3/Hr)
  • Ratio Accuracy of 0.5%
  • Very low deadband between the operation of the supply valve and exhaust valve
  • High capacity exhaust valve
  • Large area diaphragms
  • Soft seat supply and exhaust valves
  • Pressure balanced supply valve
  • Damped diaphragm control chamber
  • Two accessory ports connected to the outlet chamber
  • Tapped exhaust port
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Specifications

Brand

NPT Connection

  • 1" NPT Female
  • 3/4" NPT Female

Ambient Temperature Range

  • -40° to 93.3° C (-40° to 200° F)

Supply Pressure Effect

  • psi: 0.10 (kPa: 0.7, bar: 00.7) for psi: 100 (kPa: 700, bar: 7) Change in Supply Pressure

Diaphragm Material

  • Nitrile on Dacron

Flow Rate

  • 9.0 Cv

Approvals & Certifications

  • CRN - Canadian Registration Number

Flow Capacity

  • 500 scfm (850 m³/hour) at psig: 100 (kPa: 700, bar: 7)

Ratio

  • 1:1

BSP Connection

  • 1" BSPP Female
  • 1" BSPT Female
  • 3/4" BSPP Female
  • 3/4" BSPT Female

Enclosure, Body Material

  • Aluminum

Trim Material

  • Stainless Steel
  • Zinc-Plated Steel

Environmental Protection

  • Acceptable for use in Zones 1 & 2 for Gas Atmosphere, Groups IIA & IIB & Zones 21 & 22 for Dust Atmospheres

Supply Pressure - Maximum

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

Signal or Output Pressure - Maximum

  • psig: 150 (kPa: 1,000, bar: 10)

Exhaust Capacity - Relieving Units Only

  • 100 scfm (170 m³/hour)

Elastomers

  • Fluorocarbon
  • Nitrile

Ratio Accuracy

  • 0.5 % of psi: 100 (kPa: 700, bar: 7) Output Span
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