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The Type 20 Precision Pneumatic Air Relay from Marsh Bellofram is a compact, two-stage, pilot operated 1:1 air relay with positive and negative bias adjustment abilities. It accepts a signal pressure and, when joined with bias adjustment, sustains a resultant output pressure with an accuracy and reliability unrivaled by any other industry air pressure relays in its price range.
The Type 20 provides premium accuracy and cost effective performance in a small footprint. The durable and stable construction further includes both positive and negative bias capability. Type 20 pneumatic relays are perfect for gate actuators, air hoists, disc and shoe brakes, remote positioning devices, valve rotors, control valves, tensioning systems and web tracking systems.
| Maximum Supply Pressure | 150 PSIG (10.3 BAR) |
| Sensitivity | 1/8" H2O (3.2mm) |
| Supply Pressure Sensitivity | 0.005 PSIG (0.35 mBAR) per 25 PSIG (1.7 BAR) change in supply pressure |
| Flow Capacity | 14 SCFM (400 LPM) @ 20 PSIG (1.4 BAR) signal and 100 PSIG (6.9 BAR) supply |
| Exhaust Capacity | 2 SCFM (55 LPM) @ 5 PSIG (0.35 BAR) above a 20 PSIG (1.4 BAR) setpoint |
| Temperature Limits | -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 | 2-120 PSIG (0.1-8.3 BAR) |
| Maximum Signal | 120 PSIG (8.3 BAR) |
| Weight | 1.4 lb. (0.6 kg.) |
| Ratio of Accuracy for a 12 psig span | < 0.5% |
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- • Gate Actuators
- • Air Hoists
- • Disc & Shoe Brakes
- • Remote Positioning Devices
- • Valve Rotors
- • Control Valves
- • Tensioning Systems
- • Web Tracking Systems