Norgren R41 Installation Instructions
R40 and R41
Installation & Maintenance
Instructions
DISASSEMBLY
1. Regulator can be disassembled without removal from air
line.
2. Shut off inlet pressure. Reduce pressure in inlet and
outlet lines to zero.
3. Turn knob adjustment (1) fully counterclockwise to
remove all force on regulating spring (2).
4. Disassemble in general accordance with the item
numbers on exploded view. Use a 7/8" socket to remove
guide plug (8). When items 1 thru 10 have been
removed, cover bonnet bore in body (15) with a clean
cloth, then direct a jet of air into the IN port to force out
valve seat (11), o-ring (12), valve (13), and spring (14).
Catch seat, o-ring, valve, and spring in cloth placed over
bore in body.
CLEANING
1. Clean parts with warm water and soap. Do not submerge
knob type bonnets (1) in solution, as lubricant will be
removed.
2. Rinse and dry parts. Blow out internal passages in body
(15) with clean, dry compressed air.
3. Inspect parts. Replace those found to be damaged.
ASSEMBLY
1. Lubricate o-rings and outer surface of tube (6) with a
light coat of good quality o-ring grease.
2. Lubricate threads on bonnet (1) and guide plug (8) with
a small amount of anti-seize compound.
3. Assemble the unit as shown on the exploded view.
4. Torque Table
Item Torque
1 (Bonnet) 46 to 54 Nm (34 to 40 ft-lb)
8 (Guide plug) 3,4 to 5,6 Nm (30 to 50 in-lb)
WARNING
These products are intended for use in industrial
compressed air systems only. Do not use these products
where pressures and temperatures can exceed those listed
under Technical Data.
If outlet pressure in excess of the regulator pressure
setting could cause downstream equipment to rupture or
malfunction, install a pressure relief device downstream of
the regulator. The relief pressure and flow capacity of the
relief device must satisfy system requirements.
The accuracy of the indication of pressure gauges can
change, both during shipment (despite care in packaging)
and during the service life. If a pressure gauge is to be
used with these products and if inaccurate indications may
be hazardous to personnel or property, the gauge should be
calibrated before initial installation and at regular intervals
during use.
Before using these products with fluids other than air,
for non industrial applications, or for life-support systems
consult Norgren.
TECHNICAL DATA
Fluid: Compressed air
Inlet pressure range: 0,7 bar (10 psig) to 31 bar
(450 psig) maximum*
* For best performance, inlet pressure should be
at least 0,7 bar (10 psig) greater than the desired
regulated pressure, but must not exceed the
specified maximum.
Operating temperature: -20° to +80°C
(0° to +175°F) **
** Air supply must be dry enough to avoid ice formation
at temperatures below +2°C (+35°F).
Typical flow with 7 bar (100 psig) inlet pressure,
6,3 bar (90 psig) set pressure and 1 bar (15 psig)
droop from from set: 3 dm
3
/s (6.4 scfm)
Maximum bleed rate at 3,5 bar (50 psig) outlet
pressure: 0,12 dm
3
/s (0.25 scfm) †
† Maximum bleed rate occurs under dead-end (no
flow) conditions.
Main ports: 1/4" PTF, ISO G, or ISO Rc
R41 feedback port: 1/8" PTF, ISO G, or ISO Rc
Materials:
Body, bonnet: Aluminum
Valve: Teflon
Elastomers: Nitrile
REPLACEMENT ITEMS
R40, R41 service kit
(items circled in exploded view)...........................5945-41
Tamper resistant seal wire .......................................2117-01
PANEL MOUNTING DIMENSIONS
Panel mounting hole diameter: 48 mm (1.89")
Panel thickness: 2 to 3 mm (0.06" to 0.13")
INSTALLATION (Applications where the Norgren R40 or
R41 will be used as a pilot regulator with Norgren pilot
operated regulators)
See instructions shipped with the Norgren pilot operated
regulator.
INSTALLATION (Applications where the R40 will be used
as a pressure regulator in low flow or dead-end service)
1. Shut off air pressure. Install regulator in air line -
● upstream of lubricators and cycling valves,
● as close as possible to the device being serviced.
● at any angle.
2. Connect piping to proper ports using pipe thread sealant
on male threads only. The IN and OUT ports are marked
on the regulator body. Do not allow sealant to enter
interior of regulator.
3. Install a Norgren general purpose filter upstream of the
regulator.
ADJUSTMENT
1. Before applying inlet pressure to regulator, turn knob
adjustment counterclockwise to remove all force on
regulating spring.
2. Apply inlet pressure, then turn adjustment clockwise to
increase and counterclockwise to decrease pressure
setting.
3. Always approach the desired pressure from a lower
pressure. When reducing from a higher to a lower
setting, first reduce to some pressure less than that
desired, then bring up to the desired pressure.
4. Push lockring on knob IN to lock pressure setting. Pull
lockring OUT to release. Install tamper resistant wire (see
Replacement Items) to make setting tamper resistant.
© Norgren 2001
IM-420.225
(7/01)
Pilot Regulator/Low Flow Regulator
Relieving Type
R★★ - 2★★ - ★N★★
Thread Form
A....PTF
B....ISO Rc taper
G....ISO G parallel
Type
40..R40 Conventional Pilot
41..R41 Feedback Pilot *
* The R41 feedback pilot regulator is only available as a constant bleed (B in 7th position) with a 17 bar (250 psig ) spring (S in 9th position) e.g., R41-2xx-BNSx.
** The constant bleed feature, which provides maximum sensitivity to system changes, allows a very small amount of air to constantly escape to atmosphere.
† 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.
Spring (Outlet Pressure Range) †
E....0,3 to 3,5 bar (5 to 50 psig) (R40 only)
L....0,3 to 8,5 bar (5 to 125 psig) (R40 only)
S....0,7 to 17 bar (10 to 250 psig)
Mounting
00..R40, In line mounted
04..R41, In line mounted
05..R40, Integrally mounted to the R18 regulator
06..R41, Integrally mounted to the R18 regulator
Bleed Type
B....Constant bleed **
R....Non-bleed
R40 Body
16
R41 Body
Feedback
Port
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
15
a subsidiary of IMI plc
16
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