www.marshbellofram.com • 800.727.5646 25 Air Regulators Features • High flow capacity - Up to 80 SCFM (2266 LPM) • Responds quickly to minute changes in downstream pressure • Dampening action of aspirator tube maintains downstream pressure • Balanced supply valve minimizes the effect of supply pressure changes • Bellofram’s Buna-N and polyester rolling diaphragms are designed to give millions of cycles • Honking and buzzing eliminated by action of integral baffle and aspirator tube • Stack up construction can be disassembled and serviced without removal from air line Type 70 Description The Type 70 Regulator is specifically designed for applications that require substantial flow capacity and accurate pressure controls. Flows of 80 SCFM (2250 LPM) can be attained. Downstream pressure can be set within 0.25 in. (6.3mm) of water column and is accurately maintained under varying flow conditions with the help of an aspirator tube which adjusts the air supply in accordance with the flow velocity. A balanced supply valve, utilizing a rolling diaphragm, makes the regulator virtually immune to changes in supply pressure. The Type 70 has a rugged precision die cast aluminum housing, and is pressure-tested and chromatetreated for internal corrosion resistance. The regulator housing is finished with vinyl paint which resists scratching, weathering and other physical abuse. Type 70 High Flow Pressure Regulator Type 70 & 70BP Pressure Regulator Series Type 70BP High Flow Back Pressure Regulator Features • High flow Capacity - Up to 50 SCFM (1400 LPM) • Responds quickly to minute changes in upstream pressure • Bellofram’s Buna-N and polyester rolling diaphragms are designed to give millions of cycles • Stack up construction can be disassembled and serviced without removal from air line Type 70BP Description The Type 70 Back Pressure Regulator functions as a high flow, high precision pneumatic relief valve with an adjustable setpoint. The Type 70BP can be used in place of a standard relief valve to improve pressure control while maintaining protection against over pressurization, as in supply pressure lines to instruments and other control devices. It is most often used in conjunction with a diaphragm-operated valve and bleed orifice as a compressor controller. Excess compressor pressure is relieved through the regulator to actuate the intake restricting valve. When the regulator is shut off, downstream air escapes through the bleed orifice, allowing the restricting valve to open. Contact Us About NACE Compatible T70 Regulator "No Yellow Metals"

26 800.727.5646 • www.marshbellofram.com Air Regulators Type 70 Type 70BP Sensitivity 1/4" (6.4 mm) Water Column 1/8" (3.2 mm) Water Column Flow Capacity 40 (1113 LPM) 50 (1416 LPM) or 80 SCFM (2266 LPM) 50 SCFM (1416 LPM) Effect of Supply Pressure variation (25 psig) on Outlet Pressure < 0.025 PSIG (1.7 BAR) N/A Exhaust Capacity (5 above psig 20 psig set point) 4 SCFM (113 LPM) N/A Maximum Supply Pressure 250 PSIG (17.2 BAR) 250 PSIG (17.2 BAR) Effect of Changes in Flow on Regulated Pressure (100 psig/6.9 BAR Supply) 2.5 PSIG (0.2 BAR) over flow 50 SCFM (1416 LPM) (3/8 NPT, 0-30 PSIG / 0-2.1...

www.marshbellofram.com • 800.727.5646 27 Air Regulators Type 70BP: Regulated Pressure VS. Flow 90 6.2 80 5.5 70 4.8 60 4.1 50 3.4 40 2.8 30 2.1 20 1.4 10 0.7 0 0 SCFM 0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 LPM 0 300 575 850 1150 1400 1700 2000 FoRwaRd Flow PSIG BAR Type 70: Regulated Pressure VS. Flow 90 6.2 80 5.5 70 4.8 60 4.1 50 3.4 40 2.8 30 2.1 20 1.4 10 0.7 0 0 SCFM 0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 LPM 0 300 575 850 1150 1400 1700 2000 2265 FoRwaRd Flow PSIG BAR Regulated PRessuRe Regulated PRessuRe Type 70 and 70BP Ordering Information Part Number Port Size (NPT) Set Point Range...