Rotork Fairchild Model 70 precision pressure regulator controls a pressure signal for pneumatic instrumentation applications. This miniature regulator is ideally suited for applications with limited space. In addition, its brass bonnet and valve body makes the M70 an excellent choice for use in sensitive applications.
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.
Features
Model 70 Pneumatic Subminiature Regulator Features
- Control sensitivity of 2.5" water column and a supply pressure effect of less than 1% to deliver consistent and reliable precision accuracy to maintain your desired set point regardless of supply pressure changes or conditions
- Five set point pressure ranges from 0-5 psi, 0-3.5 BAR, 0-35 kPa up to 2-100 psi, 0.1-7 BAR, 15-700 kPa
- Compact size allows installation in restrictive spaces
- Brass and zinc plated steel construction permits use in corrosive or difficult environments
- Vibration damper provides low noise operation
- Repeatability within 0.06 psig dead ended - facilitates highly accurate setpoint control
- 70220, 70230, 70240, 70250
Specifications
Model 70 Pneumatic Subminiature Regulator Specifications
| Specification | Description |
|---|---|
| Supply Pressure (Maximum) | 250 psig [17.0 BAR] (1700 kPa) |
| Supply Pressure (Minimum) | 50 psig [3.5 BAR] (350 kPa) |
| 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 (0.48 m3/hr) where downstream pressure is 5 psig [0.35 BAR] (35 kPa) above 20 psig [1.5 BAR] (150 kPa) setpoint |
| Supply Pressure Effect | Less than 0.05 psig [0.0035 BAR] (0.35 kPa) for 5 psig [0.35 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 |
Q & A
Model 70 Pneumatic Subminiature Regulator Q & A
The sensitivity is approximately 2.5″ water column (~0.009 BAR) for set point control.
Downloads
Download Rotork Fairchild Model 70 Pneumatic Subminiature Regulator Datasheet
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