Pneumatic (Air) Relays


Marsh Bellofram pneumatic relays are designed to provide cost-effective, high-performance air regulation across a variety of applications, and in support of a variety of market requirements. Available versions and types include two-stage, pilot operating 1:1; positive and negative biasing, positive bias booster, high relief, adjustable bias, and ratio high-flow relays, all of which provide highly accurate and reliable output pressure control.


Type 72 and Type 72HR Positive Bias Booster Pneumatic Air Relays

Type 72 and Type 72HR Positive Bias Booster Pneumatic Air Relays

Type 72 and Type 72HR Positive Bias Booster Pneumatic Air Relays are positive bias booster pneumatic relays are used when high flow capacity is required.

Type 20 Precision Pneumatic Air Relay

Type 20 Precision Pneumatic Air Relay

The Type 20 Precision Pneumatic Air Relay from Bellofram PCD is a compact, two-stage, pilot operated 1:1 air relay with positive and negative bias adjustment capability.

Type 75 and Type 75HR Pneumatic Air Relays

Type 75 and Type 75HR Pneumatic Air Relays

The Marsh Bellofram Type 75 and Type 75HR Pneumatic Air Relays use signal pressure to accurately control output pressure over a wide range of flow and supply pressure variations.

Type 79 High Flow and Type 79HR Precision Air Relays

Type 79 High Flow and Type 79HR Precision Air Relays

Type 79 High Flow and Type 79HR Precision Air Relays from Marsh Bellofram PCD Type 79 1:1 ratio high-flow precision pneumatic (air) relays are designed for applications where precise flow control is required.