< Marsh Bellofram Group of Companies < Bellofram Precision Controls < Relays < T-20
Type 20 Precision Air Relay
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Relays Catalog Pgs (931 KB)
Type 20 Precision Pneumatic (Air) Relay
  • 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 Availablee
Product Detail:

The Marsh Bellofram Type 20 is a compact, two-stage, pilot operated 1:1 air relay with positive and negative bias adjustment capability. It accepts a signal pressure and, when combined with bias adjustment, maintains a resultant output pressure with an accuracy and reliability unmatched by any other industry air pressure relays in its price range

The Type 20 basic pneumatic relay is available with choice of three port sizes. Available high- relief versions (Type 20HR & 20EXHR) 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.


Applications:
· Gate Actuators
· Air Hoists
· Disc & Shoe Brakes
· Remote Positioning Devices
· Valve Rotors
· Control Valves
· Tensioning Systems
· Web Tracking Systems
Part Numbers:
Port Size (NPT)
Range psig
Range
BAR
Part Number
Type 20 Precision Relay
1:1 Ratio
1/8
2-120
0.1-8.3
961-004-000
1/4
2-120
0.1-8.3
961-005-000
3/8
2-120
0.1-8.3
961-006-000
Type 20HR Precision Relay High Relief Capacity
1:1 Ratio
1/8
2-120
0.1-8.3
961-001-000
1/4
2-120
0.1-8.3
961-002-000
3/8
2-120
0.1-8.3
961-003-000
Type 20HF Precision Relay High Flow Capacity
1:1 Ratio
3/8
2-50
0.1-3.5
961-071-000
Type 20 EXHR
1:1 Ratio
1/8
2-120
0.1-8.3
961-009-000
1/4
2-120
0.1-8.3
961-010-000
3/8
2-120
0.1-8.3
961-011-000
Options:
Replace the last three digits of the part number with digits from the table below.
OPTION
8
8
Pressure Gauge
008
Pressure Gauge: Dual scale (English & Metric) 2-inch (50.8mm) gauges are available.
   
Product Contact:
Sales Contact
Technical Contact
Specifications:
Type 20 Relay Specifications
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