Model 30 Midget Precision Regulator from Rotork Fairchild

Model 30 Midget Precision RegulatorRotork Fairchild Model 30 is a compact precision pressure regulator designed for applications that require high performance and accurate process control where space may be limited, or you wish to reduce the overall size of your panel or equipment.

Operating Principles
The Model 30 Regulator uses the force balance principal to control the movement of the valve assembly which in turn controls the output pressure. When the regulator is adjusted for a specific set point, the downward force of the Range Spring causes the Diaphragm Assembly to move downward. The Supply Valve opens and allows air to pass to the Outlet Port. As the set point is reached, the downward force exerted by the Range spring is balanced by the upward force of the downstream pressure acting on the bottom of the Diaphragm Assembly. The resultant force moves the supply Valve upward to reduce the flow of air to the Outlet Port. 

Outlet pressure is maintained as a result of balance between forces acting on the top and bottom of the Diaphragm Assembly.

Features

Model 30 Midget Precision Regulator Features

  • Five output pressure ranges from 0-2 psi, 0-0.15 BAR, 0-15 kPa up to 2-100 psi, 0.1-7 BAR, 15-700 kPa
  • Compact size - excellent for applications where space is tight
  • Control sensitivity of 1/4" water column - high accuracy for use in precision applications
  • Pressure balanced supply valve allows the regulator to remain unaffected by supply pressure changes
  • Flow of up to 40 SCFM with 100 psig - for use in applications with high flow requirements
  • Aspirator tube design compensates downstream pressure drop under flow conditions
  • Separate control chamber isolates the diaphragm from the main flow to eliminate hunting and buzzing
  • Unit construction permits you service the Model 30 regulator without removing it from the line
  • 30222, 30232, 30242, 30252, 30223, 30233, 30243, 30253

Specifications

Model 30 Midget Precision Specifications

SpecificationDescription
Supply Pressure250?psig [17.0?BAR] (1700?kPa) Maximum
Flow Capacity40?SCFM (68?m3/hr) @ 100?psig [7.0?BAR] (700?kPa) supply and 20?psig [1.5?BAR] (150?kPa) setpoint
Exhaust Capacity2.0?SCFM (3.4?m3/hr) where downstream pressure is 5?psig [.35?BAR] (35?kPa) above 20?psig [1.5?BAR] (150?kPa) setpoint
Supply Pressure EffectLess than 0.2?psig [.014?BAR] (.14?kPa) for 100?psig [7.0?BAR] (700?kPa) change in supply pressure
Sensitivity1/4″ (0.63?cm) Water Column
Ambient Temperature-40?°F to +200?°F (-40?°C to 93.3?°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: Brass

Q & A

Q&A Section with Expand/Collapse Icons

Model 30 Midget Precision Regulator Q & A:

+ What is the Model 30 and what is it used for?
The Fairchild Model 30 is a compact precision pressure regulator designed for applications requiring high performance and accurate process control in tight-space installations (such as panels or equipment enclosures).
+What output pressure ranges are available?
The Model 30 is available in five standard output pressure ranges: 0 to 2 psi, 0 to 5 psi, 0 to 10 psi, 0 to 30 psi, and 2 to 100 psi. Each range corresponds roughly to 0 to 0.15 bar up to 0.1 to 7 bar (or 15 to 700 kPa). The proper range should be selected based on the downstream pressure requirements of your system.
+ What is the maximum supply pressure it can handle?
The Model 30 can handle a maximum supply pressure of approximately 250 psi (17 bar or 1700 kPa). It is important to ensure the inlet pressure in your system does not exceed this value.
+What is the flow capacity and sensitivity of the Model 30?
This regulator has a flow capacity of up to 40 SCFM (68 m3/hr) when supplied with 100 psi and set at 20 psi output. Sensitivity is extremely high, with performance as fine as one-quarter inch of water column (about 0.015 psi), making it suitable for precision pneumatic control applications.
+What design features ensure precision and stability?
The Model 30 features a pressure-balanced supply valve that minimizes the effect of inlet pressure changes, an aspirator tube that compensates for downstream pressure drop during flow, and a separate control chamber that isolates the diaphragm from the main flow stream to reduce hunting or oscillation. Its modular design allows servicing without removing the unit from the line.

 

Downloads

Download Rotork Fairchild Model 30 Midget Precision Regulator Datasheet

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