www.marshbellofram.com • 800.727.5646 37 Air Cylinders Relays / Volume Boosters Relays & Volume Boosters Type 20 Type 20 HR Type 20 EX HR Type 72 Type 72 HR Type 75 Type 75 HR Type 79 Type 79 HR

38 800.727.5646 • www.marshbellofram.com Air Cylinders Relays / Volume Boosters Type 20 Type 20 HR Type 20 EX HR Maximum Supply Pressure 150 PSIG (10.3 BAR) 150 PSIG (10.3 BAR) 150 PSIG (10.3 BAR) Sensitivity 1/8" H2O (3.2mm) 1/8" H2O (3.2mm) 1/8" H2O (3.2mm) Supply Pressure Sensitivity 0.005 PSIG (0.35 mBAR) per 25 PSIG (1.7 BAR) change in supply pressure 0.005 PSIG (0.35 mBAR) per 25 PSIG (1.7 BAR) change in supply pressure 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 14 SCFM (400...

www.marshbellofram.com • 800.727.5646 39 Air Cylinders Relays / Volume Boosters Type 72 Type 72 HR Type 75 Type 75 HR Type 79 Type 79HR Maximum Supply Pressure 250 PSIG (17.2 BAR) 250 PSIG (17.2 BAR) 250 PSIG (17.2 BAR) 250 PSIG (17.2 BAR) 400 PSIG (27.6 BAR) 400 PSIG (27.6 BAR) Sensitivity 1/4" H2O (6.4mm) 1/4" H2O (6.4mm) 1/4" H2O (6.4mm) 1/4" H2O (6.4mm) 1" H2O (25mm) 1" H2O (25mm) Supply Pressure Sensitivity < 0.6 PSIG (0.01 BAR) per 50 PSIG (1.4 BAR) change in supply pressure < 0.6 PSIG (0.01 BAR) per 50 PSIG (1.4 BAR) change in supply pressure < 0.6 PSIG (0.04 BAR) per 50 PSIG (6.9 BAR)...

40 800.727.5646 • www.marshbellofram.com Air Cylinders Relays / Volume Boosters Features • Extreme accuracy • Positive and negative bias capability • Small size • Rugged and stable Description The 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. Models Type 20 The basic relay is offered with a choice of three port sizes. Type...

www.marshbellofram.com • 800.727.5646 41 Air Cylinders Relays / Volume Boosters Features • Four adjustable positive bias ranges, from 0-10 PSI (0-0.7 BAR) to 2-150 PSI (0.1-10.3 BAR) • Flow capacity up to 50 SCFM • Quick response to minute changes in downstream pressure • Dampening action of aspirator tube maintains stable output pressure • Output virtually unaffected by changes in supply pressure • Internal rolling diaphragm designed for millions of cycles • Honking and buzzing eliminated by action of integral baffle and aspirator tube • Can be disassembled and serviced without removing from...

42 800.727.5646 • www.marshbellofram.com Air Cylinders Relays / Volume Boosters Features • Balanced valve design • High flow capacity • Field serviceable • Multiple output ratios • Negative biasing option Description The Type 75 relay uses signal pressure to accurately control output pressure over a wide range of flow and supply pressure variation. Under varying flow conditions output pressure is maintained by use of an aspirator tube, which adjusts the air supply valve opening in accordance with the flow velocity. A balanced supply valve, utilizing a rolling diaphragm, makes the relay virtually...

www.marshbellofram.com • 800.727.5646 43 Air Cylinders Relays / Volume Boosters Features • Balanced pintle • High flow capacity • Field serviceable • Large port sizes available • Air piloted or dome loaded • 200 PSIG output • Also available in a high relieving version (Type 79HR) Description The Type 79 1:1 Ratio High Flow Precision Air Relay brings additional precision and control to the Bellofram line of precision control products. The Type 79 relay is designed for applications where a precise control of flow is needed. This regulator offers low droop, high accuracy and fine adjustment sensitivity....