Rotork Fairchild Model 81 is a high flow two stage precision pressure regulator designed for applications that require high performance, low droop and accurate process control. The Model 81 combines a pilot control system with a basic force balance system to provide accurate output pressure regulation for both highly sensitive instrumentation and control circuits and in equipment requiring high flow with precise control.
Operating Principles
This Model 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
Model 81 Multi-Stage Pressure Regulator Features
- Five output pressure ranges from 0-20 psi, 0-1.5 BAR, 0-150 kPa up to 1-100 psi, 0.05-7 BAR, 7-700 kPa
- Flow capacity of 50 SCFM, 136 m3/hr
- Sensitivity of less than 0.1" water column - well suited for high accuracy applications
- Force balance and 2 stage pilot control minimizes any droop from downstream flow
- High flow capacity - responsive operation with less exhaust time
- Sapphire orifice provides precise control of pilot control air flow
- Low air consumption - efficient operation with no losses of air or gas media
- Available in 1/4" NPT port size
Specifications
Model 81 Multi-Stage Pressure Regulator Specifications
| Specification | Details |
|---|---|
| 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) with downstream pressure 5 psig [0.35 BAR, 35 kPa] above setpoint |
| Maximum Supply Pressure | 2, 5 psig [0.15, 0.35 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 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 variation) | < 0.2 psig [0.013 BAR, 150 kPa] for 100 psig [7.0 BAR, 700 kPa] change in supply pressure |
| Air Consumption | < 0.1 SCFM [1.7 m³/hr] |
| Sensitivity | < 0.1″ [0.254 cm] Water Column |
| Ambient Temperature Limit | -40°F to +200°F (-40°C to 93°C) |
| Materials of Construction |
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Q & A
Model 81 Multi-Stage Pressure Regulator Q & A
Downloads
Download Rotork Fairchild Model 81 Multi-Stage Pressure Regulator Datasheet
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