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Type 20 Precision Air Relay
Brand: Marsh Bellofram Group of CompaniesThe Type 20 Air Relay is a compact, two-stage, pilot operated 1:1 relay with positive and negative bias adjustment capability. It accepts a signal pressure and combined with the bias adjustment, maintains a resulting output pressure with an accuracy and reliability unmatched by any other pressure relay in its price range.
High Relief Relays - These relays provide extra fast “blowdown” for very rapid release of output pressure. The extra relief feature makes this relay suitable for cylinder return stroke actuation, air hoists, and similar applications requiring fast exhaust.
Features
- Extremely Accurate and Cost-Effective Relay
- Positive and Negative Bias Capability
- Small Size
- Rugged and Stable
- Basic Relay Available With Choice of Three Port Sizes
- High Release Versions Available
Specifications
Maximum Supply Pressure
- 150 psig (10.3 bar)
Sensitivity
- 1/8" H2O (3.2 mm)
Supply Pressure Sensitivity
- 0.005 psig (0.35 mbar) per 25 psig (1.7 bar) hange in supply pressure
Flow Capacity
- 14 SCFM (400 LPM) @ 20 psig (1.4 bar) signal and 100 psig (6.9 bar) supply
Exhaust Capacity
- Type 20: 2 SCFM (55 LPM) @ 5 psig (0.35 bar) above a 20 psig (1.4 bar) setpoint
- Type 20 HR: 10 SCFM (285 LPM) @ 5 psig (0.35 bar) above a 20 psig (1.4 bar) setpoint
- Type 20 EXHR: 15 SCFM (425 LPM) @ 5 psig (0.35 bar) above a 20 psig (1.4 bar) setpoint
Temperature Limit
- -20° to 160° F (-29° to 71° C)
Air Consumption
- 8 SCFH (4 LPM)
Port Size
- 1/8", 1/4", 3/8" NPT, BSPP, BSPT
Output Pressure Range
- 2 to 120 psig (0.1 to 8.3 bar)
Maximum Signal
- 120 psig (8.3 bar)
Ratio of Accuracy for a 12 psig Span
- < 0.5%
Weight
- 1.4 lb (0.6 kg)
- Gate Actuators
- Air Hoists
- Disc & Shoe Brakes
- Remote Positioning Devices
- Valve Rotors
- Control Valves
- Tensioning Systems
- Web Tracking Systems
