The Fairchild 81 is a precision two-stage regulator that combines a pilot control system with a basic force balance system to provide accurate output pressure regulation. It is recommended for use in both highly sensitive instrumentation and control circuits and in equipment requiring high flow with precise control.

Features

• Outstanding sensitivity
• Droop or boost virtually eliminated
• Fast response
• Minimal effect for supply pressure change
• High forward flow capacity
• High exhaust capacity
• Small physical size, saves space
• Sapphire orifice
• Permits use in instrumentation and control applications
• Provides constant output pressure over large flow range
• Eliminates output pressure excursions
• Reduces time to exhaust
• Reduces abrasive effects of air

Specifications

Flow Capacity (nominal)
50 SCFM (85 m3/HR) (100 psig, [7.0 BAR], (700 kPa) supply; 20 psig, [1.5 BAR], (150 kPa) setpoint)
Exhaust Capacity
5.5 SCFM (9.4 m3/HR) Downstream pressure 5 psig [.35 BAR] (35 kPa) above setpoint
Maximum Supply Pressure
2, 5 psig, [.15, .35 BAR], (14, 35 kPa) ranges: 100 psig, [7.0 BAR], (700 kPa)
20, 60, 100 psig, [1.5, 4.0, 7.0 BAR], (140, 400, 700 kPa) ranges: 150 psig, [10.0 BAR], (1000 kPa)
Minimum Supply Pressure
20 psig, [1.5 BAR], (150 kPa)
Maximum Output Pressure
100 psig, [7.0 BAR], (150 kPa)
Pressure Change (due to supply pressure variation)
Less than .2 psig, [.13 BAR], (150 kPa) for 100 psig, [7.0 BAR], (700 kPa) change
Air Consumption
Less than 0.1 SCFM (1.7 m3/HR)
Sensitivity
Less than 0.1” (.254 cm) Water Column
Ambient Temperature Limit
-40°F to +200°F, (-40°C to 93°C)
Materials of Construction
Body: Die Case Aluminum
Trim: Stainless Steel, Brass, Aluminum, and Plated Steel
Diaphragms: Nitrile on Dacron
Orifice: Sapphire

Catalogue Pages including ordering details

Installation, Operation and Maintenance Instructions