Model 4000A Pneumatic Pressure Regulator from Rotork Fairchild

Model 4000A Pneumatic Pressure Regulator from Rotork FairchildRotork Fairchild Model 4000A is a no bleed high flow precision pressure regulator designed for applications that require high performance, very low consumption and accurate process control.

Operating Principles 
When you adjust the Range Screw to a specific setpoint, the Range Spring exerts a downward force against the top of the Control Diaphragm. This downward force opens the Supply Valve. Output pressure flows through the Outlet Port and the Aspirator Tube to the Control Chamber where it creates an upward force on the bottom of the Control Diaphragm. 

When the setpoint is reached, the force of the Range Spring that acts on the top of the Control Diaphragm balances with the force of output pressure that acts on the bottom of the Control Diaphragm and closes the Supply Valve. 

When the output pressure increases above the setpoint, the Diaphragm Assembly moves upward to close the Supply Valve and open the Exhaust Valve. Because the Poppet Valve is closed, pressure flows down the Connecting Tube to the bottom of the Motor Diaphragm. This pressure keeps the Supply Valve tightly closed while in the exhaust mode. The Poppet Valve opens and output pressure exhausts through the Vent on the side of the unit until it reaches the setpoint. 

Features

Model 4000A Pneumatic Pressure Regulator Features

  • Five output pressure ranges from 0.5-10 psi, 0.03-0.7 BAR, 3-70 kPa up to 5-250 psi, 0.35-17 BAR, 35-1700 kPa
  • Flow Capacity up to 150 SCFM, 255 m3 / hr - excellent choice for high flow precision applications
  • Control sensitivity of 1/2" water column allows for use in high accuracy applications
  • Large supply and exhaust valves provide high forward and exhaust flows
  • Soft supply and exhaust valve minimizes air consumption
  • Balanced supply valve minimizes the effect of any supply pressure variation
  • Aspirator tube compensates for downstream pressure droop under flow conditions
  • Separate control chamber isolates the diaphragm from the main flow and eliminates hunting and buzzing
  • Unit construction allows you service the Model 4000A without removing it from the line

Specifications

Model 4000A Pneumatic Pressure Regulator Specifications

SpecificationDescription
Supply Pressure250 psig, [17.0 BAR], (1700 kPa) Maximum
Flow Capacity150 SCFM (255 m3/HR) @ 100 psig [7.0 BAR] (700 kPa) supply and 20 psig [1.5 BAR] (150 kPa) setpoint
Exhaust Capacity40 SCFM (65 m3/HR) where downstream pressure is 5 psig [0.35 BAR] (35 kPa) above 20 psig [1.5 BAR] (150 kPa) setpoint
Supply Pressure EffectLess than 0.1 psig (0.007 BAR) (0.7 kPa) for 100 psig (7.0 BAR) (700 kPa) change in supply pressure
Sensitivity1/2" (1.27 cm) Water Column
Ambient Temperature Range-40°F to +200°F (-40°C to +93°C)
Hazardous LocationsAcceptable for use in Zones 1 and 2 for gas atmospheres (Groups IIA and IIB), and Zones 21 and 22 for dust atmospheres
Materials of Construction
  • Body and Housing: Aluminum
  • Diaphragms: Nitrile on Dacron
  • Trim: Zinc Plated Steel, Brass

Q & A

Q&A Section with Expand/Collapse Icons

Model 4000A Pneumatic Pressure Regulator Q & A

+What is the Model 4000A and what is it used for?
The Model 4000A is a high-flow, no-bleed precision pressure regulator designed to deliver an accurate set downstream pressure from a higher upstream supply. According to the specification it is intended for “high performance, very low consumption and accurate process control.” It’s commonly used in pneumatic and instrument-air systems, particularly where large flow rates and precise control matter.
+What’s the maximum flow capacity and why does that matter?
The Model 4000A offers flow capacity up to 150 SCFM (≈255 m3/hr) when supply is ~100 psig (≈7 bar). This high flow capacity means it can support large volume pneumatic systems without starving downstream components when demand increases.
+What does “no-bleed” mean in this context?
“No-bleed” means that the regulator does not continuously vent (bleed) air to maintain setpoint. Instead it uses internal balancing and large valves to regulate without significant wasted flow. This improves efficiency and reduces consumption.
+What fluids (gases) and conditions is it rated for?
The Model 4000A is designed for instrument or shop air (clean, dry compressed air) as indicated in the specification. It is also acceptable for hazardous locations: Zones 1 & 2 for gas atmospheres (Groups IIA & IIB) and Zones 21 & 22 for dust atmospheres. Ambient temperature rating is –40 °F to +200 °F (–40 °C to +93 °C) in the data sheet.
+ What are the installation and mounting requirements?
The inlet and outlet ports are clearly marked, and the regulator can be mounted in any position without affecting performance. For best results, use clean, dry air, ensure the supply line is free of contaminants, and avoid undersized fittings that could restrict flow. Apply only a minimal amount of thread compound to fittings and avoid using Teflon tape.

Downloads

Download Rotork Fairchild Model 4000A Pneumatic Pressure Regulator Datasheet

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