Type 75 - T75 HR Precision Relay
The Bellofram Precision Controls Type 75HR is a high-relief precision air relay designed to accurately control pneumatic output pressure while providing faster exhaust response than the standard Type 75. Signal-to-output ratios of 1:1, 1:2, 1:4, and 1:6 are available, with output pressure capability up to 150 psig. At the stated test condition, forward flow is about 40 SCFM and exhaust capacity is about 15 SCFM. A balanced supply valve and aspirator help maintain stable pressure as supply and flow conditions change, making the Type 75HR suitable for volume boosting, tensioning, clutch and brake systems, cylinder return strokes, air hoists, and valve loading.
Features:
- Balanced Valve Design
- High Flow Capacity
- Field Serviceable
- Multiple Output Ratios
- Negative Biasing Option
- Can Be Disassembled and Serviced Without Removing from Line
- Gas Flow Control
- Tensioning Control
- Clutch and Brake Controls
- Volume Boosting
- Dancer Roll Loading
- Calendar Roll Loading
- Cylinder Bucking Control
- Valve Motor Loading
- Cylinder Return Stroke Actuation (75HR)
- Air Hoists (75HR)
Rebuild Kits
yes
Product Title
Type 75HR Precision Relay
Maximum Supply Pressure
250 psig (17.2 BAR)
Pressure Ranges
0-150 psig
(0–10.3 BAR)
(0–10.3 BAR)
Port Sizes
1/4", 3/8", 1/2"
NPT, BSPP, BSPT
NPT, BSPP, BSPT
Sensitivity
1/4" H2O (6.4mm)
Bleed Rate
No Bleed
Forward Flow Capacity
40 SCFM (1150 LPM)
@ 20 psig (1.4 BAR)
signal and 100 psig
(6.9 BAR) supply
@ 20 psig (1.4 BAR)
signal and 100 psig
(6.9 BAR) supply
Exhaust Capacity @ 5 psig (0.4 BAR) above setpoint
15 SCFM (425 LPM)
@ 10 psig (0.69 BAR)
above a 20 psig
(1.4 BAR) setpoint
@ 10 psig (0.69 BAR)
above a 20 psig
(1.4 BAR) setpoint
Output Pressure Ranges
0-150 psig
(0–10.3 BAR)
(0–10.3 BAR)
Temperature Range
-40 to 200˚F
(-40 to 93˚C)
(-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
< 0.6 psig (0.01 BAR)
per 50 psig (1.4 BAR)
change in supply pressure
per 50 psig (1.4 BAR)
change in supply pressure
Maximum Signal
150 psig
(10.3 BAR)
(10.3 BAR)
Ratio of Accuracy for 12 psig span
< 2% (1:1)
Filter Ratio
1:1,
1:2
Filter Output Pressure Ranges
0-150 PSIG
Filter Maximum Supply Pressure
250 PSIG
Filter Port Size
1/4" NPT,
3/8" NPT,
1/2" NPT
Filter Flow Capacity
26-100 SCFM
Find Your Part Number
Not sure? Call for help. Phone: 304-387-1200
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