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Model 4900A Pneumatic Volume Booster

Brand: Fairchild Industrial Products
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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

Ambient Temperature Range

  • -40° to 93.3° C (-40° to 200° F)

Approvals & Certifications

  • CRN

BSP Connection

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

Diaphragm Material

  • Nitrile on Dacron

Elastomers

  • Fluorocarbon
  • Nitrile

Enclosure, Body Material

  • Aluminum

Environmental Protection

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

Exhaust Capacity - Relieving Units Only

  • 100 scfm (170 m³/hour)

Flow Capacity

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

Flow Rate

  • 9.0 Cv

NPT Connection

  • 1” NPT Female
  • 3/4” NPT Female

Ratio

  • 1:1

Ratio Accuracy

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

Signal or Output Pressure - Maximum

  • psig: 150 (kPa: 1,000, bar: 10)

Supply Pressure - Maximum

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

Supply Pressure Effect

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

Trim Material

  • Stainless Steel
  • Zinc-Plated Steel
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