Bellofram Air Regulators Type 77 Catalog Page
Air Regulators
Type 77
Vacuum Regulator Series
Features
•Single-unit control of pressures from 29" Hg
vacuum to 150 PSI
•Flow capacity up to 40 SCFM
•Dampening action of aspirator tube maintains
stable output pressure
•Output virtually unaffected by changes in
supply pressure
•Can be disassembled and serviced without
removing from line
Description
Bellofram’s Type 77 Vacuum Regulator incorporates a fixed negative 15 PSIG bias spring
to maintain vacuum outputs up to 29" Hg. An
adjustable opposing range spring increases
controlled pressure outputs up to 150 PSIG.
Output pressure droop under varying downstream flow conditions is minimized by use of an
aspirator tube which adjusts the air supply valve
opening in accordance with flow velocity. A
balanced supply valve, utilizing a reinforced rolling diaphragm, keeps regulator output virtually
immune to changes in supply pressure. Stack-up
construction makes the Type 77 easily serviceable, without removing it from the air line.
Applications
The Type 77 provides precise control in subatmospheric pressure applications. Specific uses
include sample collecting systems, air quality
monitoring, parts coating operations, and other
industrial functions requiring controlled system
pressure from 29" Hg vacuum to 150 PSIG.
The regulator may be installed either upstream
or downstream from the vacuum pump.
Upstream installation (Figure 1) is preferred
when rapid evacuation of a vessel or system is
required, because the exhaust capacity of the
pump is normally greater than that of the regulator. In all other applications, the regulator can
be located between the pump and the vessel.
(Figure 2)
Sensitivity
Flow Capacity
Effect of Supply Pressure variation
(25 psig/1.7 BAR) on Outlet Pressure
Exhaust Capacity@ 5 psig (0.34 BAR) above setpoint
Maximum Supply Pressure
Ambient Temperature Limits
Output Pressure Ranges
Total Air Consumption @ Maximum Output
Port Size
Materials of Construction
Mounting Options
Type 77
Vacuum Regulator Series
TYPE 77
1/2" (1.3 cm) Water Column
2.5 SCFM (71 L/M) @ 29" Hg
(740 mm Hg) Vacuum
40 SCFM (1130 L/M) @ 100 PSIG
(6.9 BAR) supply, 20 PSIG (1.4 BAR) output
Less than 0.1 PSIG (0.01 BAR)
4 SCFM (113 LPM)
250 PSIG (17.2 BAR)
-40 to 200˚F (-40 to 93˚C)
Vacuum to 2 PSIG (0.1 BAR)
Vacuum to 10 PSIG (0.7 BAR)
Vacuum to 30 PSIG (2.1 BAR)
Vacuum to 100 PSIG (6.9 BAR)
Vacuum to 150 PSIG (10.3 BAR)
6 SCFH (2.8 LPM)
1/4 NPT, 3/8 NPT, 1/4 BSPT, 3/8 BSPT
Body: Diecast Aluminum with Vinyl Paint
Trim: Stainless steel, Brass, Plated steel, Acetal and Buna-N
Diaphragm: Buna-N with Polyester Fabric
Knob: Phenolic Plastic
Spring: Music wire
Pipe, Panel or Bracket
28
800.727.5646 • www.marshbellofram.com
Type 77 Ordering Information
TYPE 77
VACUUM PUMP
SUPPLY
TYPE 77
TANK
FIGURE 1
T70
Range Part Number
BAR PSIG 1/4 NPT Port 3/8 NPT Port
Vac. to 0.1 2 960-500-000 960-505-000
Vac. to 0.7 10 960-501-000 960-506-000
Vac. to 2.1 30 960-502-000 960-507-000
Vac. to 6.9 100 960-503-000 960-508-000
Vac. to 10.3 150 960-504-000 960-509-000
Type 77 Option Ordering Matrix
Replace last three digits of part number with digits from table below.
Option
5
Epoxy Finish 005 075 085
7
Mounting Bracket 007 0 87
8
Pressure Gauge 008
To order BSPT threads (including the gauge port)
add “BSPT” to end of part number.
578
Regulator Options and Accessories
Corrosive Resistant Epoxy Finish
An epoxy paint applied to the body and bonnet of the regulator exterior
surfaces to provide increased corrosion resistance.
Mounting Bracket
Steel (dichromate finish) bracket for side mounting.
Pressure Gauge
Dual scale 2.5 in. (63 mm) gauges. Ranges include 30" Hg – 15 PSIG
(-100 to 100 kPa), 30" Hg – 60 PSIG (-100 to 400 kPa), and 30" Hg – 150
PSIG (-100 to 1100 kPa). When specified with regulator, the correct range
will be supplied. For NPT versions only.
Type 77 Dimensional Drawing
Air Regulators
Figure 1
TANK
SUPPLY
Figure 2
VACUUM PUMP
www.marshbellofram.com • 800.727.5646
SUPPLY
TYPE 77
VACUUM PUMP
TANK
29
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