Model 55 Miniature Precision Regulator from Rotork Fairchild

Model 55 Miniature Precision Regulator from Rotork FairchildRotork Fairchild Model 55 is a compact precision polymer pressure regulator for high performance applications where space or weight may be limited or material compatibility concerns dictate use of a polymer construction regulator.

Operating Principles
When the setpoint is reached, the upward force of the output pressure that acts on the bottom of the Diaphragm balances with the downward force that acts on the top of the Diaphragm. If the output pressure rises above the setpoint, the force that acts on the bottom of the Diaphragm moves the Diaphragm Assembly upward to close the Supply Valve and open the Relief Valve. Excess output pressure exhausts through the Vent in the unit until it reaches the setpoint.

Features

Model 55 Miniature Precision Regulator Features

  • Compact size
  • Lightweight unit
  • Handles high supply pressure
  • High accuracy for precision control
  • Polymer construction for corrosive resistance
  • Venturi design compensates downstream pressure droop under flowing conditions
  • Non-rising adjustment knob
  • Manifold mount capability
  • Separate control chamber isolates the Diaphragm from the main flow to eliminate hunting and buzzing

Specifications

Model 55 Miniature Precision Regulator Specifications

SpecificationDescription
Flow Capacity9 SCFM (17.0 m3/hr) @ 120 psig [8 BAR] (800 kPa) supply
Exhaust Capacity2 SCFM (3.4 m3/hr) where downstream pressure is 15 psig [1.0 BAR] (100 kPa) above set point
Maximum Supply Pressure150 psig [10 BAR] (1000 kPa)
Supply Pressure Effect0.1 psig for 10 psig change in supply
Ambient Temperature-40°F to +150°F (-40°C to 65.5°C)
Materials of Construction
Body and HousingValox 508
ValveStainless Steel
DiaphragmPolymer Reinforced Nitrile
Mounting BracketValox 508

Q & A

Q&A Section with Expand/Collapse Icons

Model 55 Miniature Precision Regulator Q & A

+ What is the Model 55 pressure range and how many options are available?
The Model 55 offers four selectable set-point output pressure ranges: 0-10 psi (≈0-0.7 bar), 0.5-30 psi, 1-60 psi, and 2-100 psi (≈0.1-7 bar).
+ What is the maximum supply pressure for the Model 55?
The maximum supply (inlet) pressure allowed is 150 psi (10 bar, 1000 kPa).
+ What is the flow capacity of the Model 55?
The forward flow capacity is 9 SCFM (≈17.0 m3/hr) at a 120 psi supply. Exhaust (bleed) capacity is 2 SCFM (≈3.4 m3/hr) when the downstream pressure is 15 psi above the set point.
+ What is the “supply pressure effect” (SPE) or how much does output vary with supply changes?
The regulator exhibits a supply pressure effect of about 0.1 psi change in output for every 10 psi change in supply pressure.
+ What is the ambient temperature range for safe operation?
The Model 55 is rated for ambient temperatures from ?40 °F to +150 °F (?40 °C to 65.5 °C).
 


 

Downloads

Download Rotork Fairchild Model 55 Miniature Precision Regulator Datasheet

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