Fairchild 70B Pneumatic Subminiature Regulator
The Fairchild 70B controls a pressure signal for pneumatic instrumentation. This regulator is ideally suited for applications with limited space.
Features
- Vibration damper provides low noise operation.
- Repeatability within 0.06 psig dead ended allows accurate setpoint control.
- Small size allows installation in restrictive spaces.
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 Vents in the unit until it reaches the setpoint. The Vibration Damper dampens the throttling action of the Valve.
Specifications
Supply Pressure
250 psig, [17.0 BAR], (1700 kPa) Maximum
50 psig, [3.5 BAR], (350 kPa) Minimum
Flow Capacity
2.5 SCFM (4.25 m3/HR) @ 100 psig, [7.0 BAR], (700 kPa) supply and 30 psig, [2.0 BAR], (200 kPa) setpoint
Exhaust Capacity
0.28 SCFM (.48 m3/HR) where downstream pressure is 5 psig, [.35 BAR], (35 kPa) above 20 psig, [1.5 BAR], (150 kPa) setpoint
Supply Pressure Effect
Less than 0.05 psig, [.0035 BAR], (.35 kPa) for 5 psig [.35 BAR], (35 kPa) change in supply pressure
Ambient Temperature
-40°F to + 160°F, (-40°C to + 71°C)
Materials of Construction
Body: Brass
Diaphragms: Fluorocarbon
Trim: Zinc Plated Steel
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