Type 77 - T77 Vacuum Regulator
The Bellofram Precision Controls Type 77 is a vacuum pressure regulator that provides single-unit control from up to 29 inches Hg vacuum through positive pressure outputs as high as 150 psi. Flow capacity reaches 40 SCFM, with maximum supply pressure of 250 psig. A fixed negative bias spring, adjustable opposing range spring, aspirator tube, and balanced supply valve work together to maintain stable output as flow and supply conditions change. The Type 77 is used in sample-collection systems, air-quality monitoring, coating operations, and installations upstream or downstream of a vacuum pump.
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
- Sample Collecting Systems
- Air Quality Monitoring
- Parts Coating Operations
- May be Installed Upstream or Downstream From the Vacuum Pump
Size
3.0" X 3.0" X 7.25"
Maximum Supply Pressure
250 psig (17.2 BAR)
Pressure Ranges
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)
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)
Port Sizes
1/4", 3/8" NPT
Sensitivity
1/2" (1.3 cm) Water Column
Forward Flow Capacity
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
(740 mm Hg) Vacuum
40 SCFM (1130 L/M) @ 100 psig
(6.9 BAR) supply, 20 psig (1.4 BAR) output
Exhaust Capacity @ 5 psig (0.4 BAR) above setpoint
4 SCFM (113 LPM)
Temperature Range
-40 to 200˚F (-40 to 93˚C)
Total Air Consumption @ Maximum Output
6 SCFH (2.8 LPM)
Materials of Construction
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
vinyl paint
Trim: Stainless steel, brass
plated steel, Acetal and Buna-N
Diaphragm: Buna-N with
polyester fabric
Knob: Phenolic plastic
Spring: Music wire
Effect of Supply Pressure Variation on Outlet Pressure
Less than 0.1 psig (0.01 BAR)
Effect of Changes in Flow on Regulated Pressure
2.0 psig over flow of 10 SCFM (3/8"
NPT,
0-30 psig range,
15 psig set point
NPT,
0-30 psig range,
15 psig set point
Mounting Options
Pipe, Panel or Bracket
Find Your Part Number
Not sure? Call for help. Phone: 304-387-1200
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