Norgren R91 User Manual
See Section ALE-24 for Accessories
ALE-5-6
Littleton, CO USA Phone 303-794-2611 www.norgren.com
R91
● Bonnet and body made from acetal plastic.
● R91W designed for use with deionized water and
potable water systems. Plastics and metals in
contact with fluid are approved by the National
Sanitation Foundation (NSF) or the Food And Drug
Administration (FDA) for use in potable water
systems. Elastomers are food grade. Non relieving
models only.
● R91G designed for use with non-potable water and
compressed air systems. Non relieving and relieving
models.
● Low torque, non-rising adjusting knob.
● Snap action knob locks pressure setting when
pushed down.
● Can be disassembled without the use of tools or
removal from the air or water line.
Water or Compressed Air Pressure
Regulator 1/4" Port Size
Non Relieving
Relieving
ISO Symbols
R 9 1
-
★ ★ ★
-
★★ ★ ★
Port Size Substitute
1/4" 2
Threads Substitute
PTF A
ISO Rc taper B
ISO G parallel G
Diaphragm Substitute
Non relieving N
Relieving ¶ R
Gauge Substitute
With G †
Without N
Application Substitute
Industrial air, non-potable water G
Potable water, deionized water W
Adjustment Substitute
Knob K
Alternative Models
Outlet Pressure Adjustment Range†† Substitute
5 to 50 psig (0.3 to 3.5 bar) E
5 to 125 psig (0.3 to 8.6 bar) L
* Approximate flow with 150 psig (10 bar) inlet pressure, 90 psig (6.3 bar) set pressure and a 15 psig (1 bar) droop from set.
** Approximate flow with 100 psig (7 bar) inlet pressure, 60 psig (4 bar) set pressure and a 15 psig (1 bar) droop from set.
† Gauge with NSF approved materials not available.
†† Outlet pressure 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.
¶ Relieving diaphragm only available with the R91G regulator.
Ordering Information.Models listed include PTF threads, knob adjustment, non relieving diaphragm, 5to 125 psig (0.3 to 8.6 bar) outlet pressure
adjustment range†, and without gauge.
Inlet Port Application Model Flow* scfm (dm3/s) Flow** gpm (lpm) Weight lb (kg)
1/4"
Industrial air and
R91G-2AK-NLN 24 (11) 1.75 (6.6) 0.15 (0.07)
non-potable water
1/4"
Potable water and
R91W-2AK-NLN 24 (11) 1.75 (6.6) 0.15 (0.07)
deionized water
ALE-5-7
Littleton, CO USA Phone 303-794-2611 www.norgren.com
R91 Special Purpose Regulators
Technical Data
Fluid
R91G: Compressed air and non-potable water
R91W: Potable water, deionized water
Maximum pressure: 150 psig (10 bar)
Operating temperature
Water service: 35° to 125°F (2° to 52°C)
Air service: 0° to 125°F (-20° to 52°C) *
* When used in air service, air supply must be dry enough to avoid ice formation at temperatures
below 35°F (2°C).
Typical flow for compressed air service at 150 psig (10 bar) inlet pressure, 90 psig
(6.3 bar) set pressure and a droop of 15 psig (1 bar) from set: 24 scfm
(11 dm
3
/s).
Typical flow for water service at 100 psig (7 bar) inlet pressure, 60 psig (4 bar) set
pressure and a droop of 15 psig (1 bar) from set: 1.75 US gpm per minute
(6.6 liters)
Gauge ports:
1/8 PTF with PTF main por ts
R1/8 with ISO Rc main ports
R1/8 with ISO G main ports
Materials
Body and bonnet: Acetal
Valve
R91G: Brass/nitrile
R91W: Stainless steel/food grade EPDM
Valve seat: Acetal
Valve seat o-ring
R91G: Nitrile
R91W: Food grade EPDM
Diaphragm
R91G: Acetal/nylon inserted nitrile
R91W: Acetal/nylon inserted nitrile, food grade
Gauge port plugs: Polypropylene (furnished only with PTF-ported units)
Typical Performance Characteristics
Panel mounting hole diameter 1.19" (30 mm)
Maximum panel thickness 0.25" (6 mm)
Service Kits
Item Type Part number
Service kit R91W, non relieving 3407-93
R91G, non relieving 3407-94
R91G, relieving 3407-95
Service kit contains slip ring, diaphragm, valve seat with o-ring,
valve, and valve spring.
All Dimensions in Inches (mm)
1.63 (41)
0.73
0.90
(19)
(23)
1.50 (38)
2.13 (54)
bar
psig
8
100
6
80
60
4
OUTLET PRESSURE
40
2
20
0
0
0 10 20 30 40 50 scfm
0 5 10 15 20 25 dm3/s
bar
psig
4
50
3
40
30
2
20
OUTLET PRESSURE
1
10
0
0
0 0.5 1.0 1.5 2.0 2.5 US gal./min
0 2 4 6 8 10 liters/min
AIR FLOW CHARACTERISTICS
PORT SIZE: 1/4"
SPRING RANGE: 5 to 125 psig (0.3 to 8.6 bar)
INLET PRESSURE: 150 psig (10 bar)
AIR FLOW
WATER FLOW CHARACTERISTICS
PORT SIZE 1/4"
SPRING RANGE: 5 to 50 psig (0.3 to 3.5 bar)
INLET PRESSURE: 100 psig (7 bar)
WATER FLOW
1.50 (38)
1.1 (28)
2.54 (65)
3.01 (76)
0.9 (25)
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