Norgren V74G Datasheet
Littleton, CO USA Phone 303-794-2611 www.norgren.com
V74G
● Excelon design allows in-line or modular installation
● Push to lock adjusting knob with tamper resistant
accessory
● Easily disassembled for servicing without removal
from air line
● Helps protect air operated equipment from over
pressure by retarding excessive pressure build up
● Modular installations with Excelon 72, 73,and 74
series can be made to suit particular applications
74 Series Pressure Relief Valve
3/8", 1/2", 3/4" Port Sizes
ALE-14-6
See Section ALE-24 for Accessories
Alternative Models
Ordering Information. Models listed include PTF threads, knob adjustment, and a 5 to 150 psig (0.3 to 10 bar) relief pressure adjustment range*.
V 7 4-G
★ ★
-
★★
N
★
Threads Substitute
PTF A
ISO Rc taper B
ISO G parallel G
Adjustment Substitute
Knob K
T-bar T
Port Size Model Weight lb (kg)
3/8" V74G-3AK-NMN 0.69 (1.53)
1/2" V74G-4AK-NMN 0.68 (1.50)
3/4" V74G-6AK-NMN 0.67 (1.47)
Gauge Substitute
With G
Without N
Relief Pressure
Adjustment Range* Substitute
5 to 60 psig (0.3 to 4 bar) F
5 to 150 psig (0.3 to 10 bar) M
10 to 250 psig (0.7 to 17 bar)** S
* Relief valve can be adjusted to pressures in excess of,
and less than, those specified. Do not use these units to control
pressures outside of the specified ranges.
** Units with 250 psig (17 bar) relief pressure range are available
only with the T-bar adjustment; therefore substitute Tat the 7th
position and S at the 9th position.
Port Size Substitute
3/8" 3
1/2" 4
3/4" 6
ISO Symbol
V74G Pressure Relief Valves
Littleton, CO USA Phone 303-794-2611 www.norgren.com
ALE-14-7
All Dimensions in Inches (mm)
Technical Data
Fluid: Compressed air
Maximum pressure: 300 psig (20 bar)
Operating temperature*: -30° to 175°F (-34° to 80°C)
* Air supply must be dry enough to avoid ice formation at temperatures below 35°F (2°C).
Gauge ports:
1/4" PTF with PTF main ports
Rc1/4 with ISO Rc main ports
Rc1/8 with ISO G main ports
Materials
Body: Aluminum
Bonnet: Aluminum
Valve: Aluminum and Nitrile
Elastomers: Nitrile
Bottom plug: Acetal
Typical Performance Characteristics
Service Kits
Service kit includes diaphragm, bottom plug o-ring.
Item Type Part Number
Service kit Diaphragm & Seal 4384-700
Panel mounting hole diameter: 2.06" (52 mm)
Maximum panel thickness:0.25" (6 mm)
3.15 (80)
RELIEF CHARACTERISTICS
psig
bar g
100
6
80
60
4
INLET PRESSURE
40
2
20
0
0
0 40 80 120 160 200 scfm
0 20 40 60 80 100 dm3/s
PORT SIZE: 1/2"
RANGE: 5 to 150 psig (0.3 to 10 bar)
AIR FLOW
Optional
Gauge
2.89 (74)2.20 (56)
1.45 (37)
2.00 (50)
1.69 (43)
1.24 (31)
4.98 (127)
5.95 (151)
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