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Model 22 Pneumatic Computing Relay
Brand: Fairchild Industrial ProductsThe Rotork Fairchild Model 22 Pneumatic Computing Relay is a highly versatile control valve designed to perform a number of specialized functions, including averaging, differential, inverting, and totalizing.
This high quality unit, which offers up to four inputs as well as positive and negative biasing over a broad range, is available in several configurations to meet most application requirements.
The combination of multiple configuration options and accurate response characteristics make the Model 22 the ideal choice in a variety of applications with specific input/output requirements such as override or multi-element control, or as an ON-OFF valve.
When used as an ON-OFF valve, the Model 22 may open or close a pneumatic circuit, moving rapidly to a full open or a full closed position when signal pressures deviate from set point.
In the full open position, the valve passes full supply pressure without modulation or regulation.
The function is achieved by connecting output pressure to the signal chamber. This connection forms a feedback loop so that, once flow is started, the valve is driven wide open.
The relay always goes full open or full closed when conditions are as shown in the diagrams on the Fairchild specification sheets and catalog.
Features- Small bleed across relief seat
- Multiple inputs available
- Adjustable Bias Range from -18 to 15 psig
- Two gauge ports located 90° from supply and outlet ports
- Line or Panel Mounting
Specifications
Function
- Amplifying
- Amplifying Differential
- Averaging
- Differential
- Differential On-Off
- Direct On-Off
- Inverting
- Reducing
- Reverse On-Off
- Totalizing
- Totalizing Differential
- 1:1 Ratio
Pipe/Port Size
- 1/4"
- 3/8"
Pipe/Port Thread Type
- NPT
Normal Supply Pressure
- 20 psig : 1.5 bar : 150 kPa
Input & Output Pressure
- 3-15 psig : 0.2-1.0 bar : 20-100 kPa
Ambient Temperature Limits
- -40° F to +200° F (-40° C to 93.3° C)
Bonnet Material
- Aluminum
Diaphragm Material
- Buna-A
Range Screws & Fasteners Material
- Zin-Plated Steel
Mounting Style
- Line/Pipe Mount
- Panel Mount
Supply Pressure Effect
- A Supply Pressure Change of psig: 5 (bar: 0.35, kPa: 35) Will Not Change Output Pressure
Actuator Type
- Knob Adjust
Ambient Temperature Range
- -40° to 93° C (-40° to 200° F)
Relief
- Relieving
Enclosure, Body Material
- Aluminum
Mounting
- None
Air Consumption
- Maximum
Sensitivity
- Multiple Configurations Allowing up to 4-inputs Plus Positive & Negative Biasing over A Board Range, Designed for Multiple Functions Such as Averaging, Differential, Inverting, Totalizing & ON/OFF
Trim Material
- Zinc-Plated Steel
Flow Capacity
- 2 scfm
- 3.4 m³/hour (30)
Supply Pressure - Maximum
- bar: 7
- kPa: 700
- psig: 150
Pressure Range
- bar: 0.2 to 10
- kPa: 20 to 1,000
- psig: 3 to 150
Elastomers
- Buna-A
Exhaust Capacity - Relieving Units Only
- Multiple Configurations Allowing up to 4-inputs Plus Positive & Negative Biasing over A Broad Range, Designed for Multiple Functions Such as Averaging, Differential, Inverting, Totalizing & ON/OFF.
Vent
- Straight
Signal or Output Pressure - Maximum
- bar: 3.5
- kPa: 350
- psig: 50
NPT Connection
- 1/4" NPT Female
- 3/8" NPT Female
