Model M11 Low Pressure Pneumatic Regulator from Rotork Fairchild

Model M11 Low Pressure Pneumatic RegulatorRotork Fairchild Model 11 is a Low-Pressure Precision Pressure Regulator designed for applications that require high performance and accurate process control at very low pressures down to 3 inches water column.

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, and output pressure exhausts through the Vent on the side of the unit until it reaches the setpoint.

Features

Model M11 Low Pressure Pneumatic Regulator Features

  • Control sensitivity of less than 0.05" water column - precision control in very low pressure applications
  • High flow capacity to deliver consistent and reliable precision accuracy to maintain your desired set point regardless of supply pressure changes or conditions
  • Flow capacity of 27 SCFM, 40.7 m3/hr
  • Five output pressure ranges from 0-0.5 psi, 0-0.034 BAR, 0-3.4 kPa up to 0-12 psi, 0-0.83 BAR, 0-83 kPa
  • Aspirator tube compensates for any pressure build up under flow conditions

Specifications

Model M11 Low Pressure Pneumatic Regulator Specifications

SpecificationDetails
Flow Capacity20 SCFM (34 m3/hr) @ 100 psig [7 BAR] (700 kPa) supply and 1.0 psig setpoint
Exhaust Capacity0.5 SCFM (0.85 m3/hr) when downstream pressure is 0.1 psig [0.007 BAR] (0.7 kPa) above 1.0 psig setpoint
Maximum Supply Pressure150 psig [10 BAR] (1000 kPa)
Supply Pressure Effect< 0.01 psig for 100 psig change in supply
Sensitivity0.05″ Water Column
Ambient Temperature Range-40°F to +200°F (-40°C to 93.3°C)
Materials of Construction
  • Body & Housing: Aluminum
  • Diaphragm: Nitrile or Fluorocarbon
  • Trim: Zinc-plated Steel, Stainless Steel

Q & A

Q&A Section with Expand/Collapse Icons

Model M11 Low Pressure Pneumatic Regulator Q & A:

+ What is the primary application of the Model 11?
The Model 11 is designed for very low pressure, high-precision pneumatic regulation—ideal where control sensitivity and minimal offset are critical (down to inches of water column).
+ What is the set-point (output) pressure range available?
The Model 11 supports output ranges from as low as 0–0.5 psig up to 0–12 psig (≈0–0.034 BAR to 0–0.83 BAR) per the specification.
+ What is the maximum supply (inlet) pressure for the Model 11?
The Model 11 offers a control sensitivity of less than 0.05″ water column, making it extremely stable in very low-pressure applications.
+ What is the flow capacity of the Model 11?
It has a flow capacity rated around 24–27 SCFM (≈40.7 m3/hr) under appropriate conditions.
+ What are the typical materials of construction and elastomer options?
The body is aluminum; diaphragm materials include nitrile or optional fluorocarbon (Viton) elastomers; trim may include brass or zinc-plated steel.

 

Downloads

Download Model M11 Low Pressure Pneumatic Regulator Datasheet

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