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Type 79 - T79 High Flow Relay

T79
T79
The Bellofram Precision Controls Type 79 is a 1:1 high-flow precision air relay designed to reproduce a pneumatic control signal while supplying substantially more air volume to downstream equipment. Its balanced pintle and Bellofram rolling diaphragm help maintain stable output despite changes in supply pressure and flow demand. At the stated test condition, forward flow exceeds 125 SCFM, with output capability up to 200 psig and maximum supply pressure up to 400 psig. The Type 79 is used for pneumatic volume boosting, gas-flow control, tensioning systems, dancer and calender roll loading, cylinder control, and valve-motor loading.
Features:
  • Balanced Pintle
  • High Flow Capacity
  • Field Serviceable
  • Large Port Sizes Available
  • Air Piloted or Dome Loaded
  • 200 PSIG Output
Applications:
  • Gas Flow Control
  • Tensioning Control
  • Volume Boosting
  • Dancer Roll Loading
  • Calendar Roll Loading
  • Cylinder Bucking Control
  • Valve Motor Loading
Maximum Supply Pressure
400 psig (27.6 BAR)
Pressure Ranges
0-200 psig
(0-13.8 BAR)
Port Sizes
3/8", 1/2", 3/4", 1"
NPT, BSPP, BSPT
Sensitivity
1" H2O (25mm)
Forward Flow Capacity
>125 SCFM (3500 LPM)
@ 20 psig (1.4 BAR)
signal and 100 psig
(6.9 BAR) supply
Exhaust Capacity @ 5 psig (0.4 BAR) above setpoint
31 SCFM (875 LPM)
@ 5 psig (0.35 BAR)
above a 20 psig
(1.4 BAR) setpoint
Temperature Range
-40 to 200˚F
(-40 to 93˚C)
Total Air Consumption @ Maximum Output
<12 SCFH (5.7 LPM)
Materials of Construction
aluminum, brass, carbon steel, stainless steel, acetal, nitrile
Supply pressure sensitivity
<0.35 psig (0.02 BAR)
per 100 psig (3.5 BAR)
change in supply pressure
Maximum Signal
200 psig
(13.8 BAR)
Ratio of Accuracy for 12 psig span
<1.5%
Filter Ratio
1:1
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