• 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
provide millions of cycles
• Honking & buzzing eliminated by action of integral baffle and aspirator tube
• Stack up construction can be disassembled and serviced without removal
from air line
DESCRIPTION
The Type-70 Regulator is specifically designed for applications that require
PRECISION CONTROL DEVICE
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 chromate-treated for internal
corrosion resistance. The regulator housing is finished with
vinyl paint which resists scratching, weathering and
other physical abuse.
Type-70 High Flow Back
Pressure Air 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
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.
Page 3
TYPE 70TYPE 70BP
RegulatorRegulator
Sensitivity 1/4" (6.4 mm) Water Column1/8" (3.2 mm) Water Column
Flow Capacity40, 50, or 80 SCFM50 SCFM
Effect of Supply Pressure variation (25 psig) < 0.025 psig (1.7 BAR)N/A
on Outlet Pressure
Exhaust Capacity (5 psig above 20 psig set point)4 SCFM (113 LPM)N/A
Maximum Input / Supply Pressure250 psig (17.2 BAR)250 psig (17.2 BAR)
Effect of Changes in Flow on Regulated Pressure 2.5 psig (0.2 BAR) over flow 50 SCFM (1416 LPM)N/A
(100 psig/6.9 BAR Supply)(3/8" NPT, 0-30 psig / 0-2.1 BAR range,
Output Pressure Ranges (Type 70)
0-0.1 BAR, 0-0.7 BAR, 0-2.1 BAR, 0.1-4.1 BAR
Set Point Ranges (Type 70BP)
Total Air Consumption @ Maximum Outputfrom 1.0 to 12.5 SCFH (0.5-6 LPM)N/A
Temperature Range-40º to 200º F (-40º to 93º C)-40º to 200º F (-40º to 93º C)
Port Size1/4", 3/8", 1/2" NPT, BSPT1/4", 3/8", 1/2" NPT, BSPT
Size3.0" X 3.0" X 6.0" (76 X 76 X 152 mm)3.0" X 3.0" X 6.0" (76 X 76 X 152 mm)
Weight1.41 lb. (0.6 kg)1.5 lb. (0.7 kg)
Materials of ConstructionBody: Diecast aluminum with vinyl paintBody: Diecast aluminum with vinyl paint
Preset PressureNoNo
Tamper-Resistant CoverYesYes
MountingPipe, panel, or bracketPipe, panel, or bracket
Used in applications where it is desirable to relieve pressure
downstream of the regulator, for some constant flow applications, and where the gas flowing through the regulator must not
escape at the regulator. Non-relieving regulators should not be
used for low or no flow applications.
CORROSIVE RESISTANT EPOXY FINISH
An epoxy paint applied to the body and dripwell of the regulator
exterior surfaces to provide increased corrosion resistance.
TAPPED VENT
Allows installation of plumbing to capture exhaust air.
MOUNTING BRACKET
Steel (dichromate finish) bracket for side mounting.
PRESSURE GAUGE
Dual scale 2 in. (50.8 mm) gauges. Ranges include 0-30 psig
(0-200 kPa), 0-60 psig (0-400 kPa), 0-100 psig (0-700 kPa) and
0-160 psig (0-1100 kPa). When specified with regulator, the
correct range will be supplied.
TAMPER-RESISTANT COVER
An aluminum tubular cover placed over a slotted head adjusting
screw and screwed onto the bonnet of the regulator with a
wrench. Prevents ordinary hand adjustments.
LOW BLEED
Reduces steady-state air consumption by approximately 50%.
CHECK VALVE
Allows quick dumping of output line pressure through the
supply air line when the supply is shut down.
IMPORTANT NOTICE: Our recommendations, if any, for the use of this product are based on tests believed to be reliable. The greatest care is exercised in the selection of our raw materials and in our manufacturer, no guarantee or warranty, express or implied, is made as to such use or effects incidental to such use, handling or possession or the
results to be obtained, whether in accordance with the directions or claimed so to be. The manufacturing expressly
disclaims responsibility therefor. Furthermore, nothing contained herein shall be construed as a recommendation to
use any product in conflict with existing laws and/or patents covering any material use.
LT0805 3m 2/04
SALES & APPLICATIONS
(800) 727-5646 fax: (304) 387-4417
www.marshbellofram.com
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