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Description
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
Inventory
Configure
Model 4900A
Ratio

Port Size

Port Thread

Elastomers

Feedback Option

Trim

Specifications
Specifications
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
- 0.042361111111
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
Documentation
Documentation
Installation Instructions
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