Norgren R18 User Manual

R18

Installation & Maintenance

Instructions

6. Install a Norgren muffler (see Replacement Parts) in the

exhaust port of the R18 regulator. Installation of a muffler
will reduce work area noise and protect R18 internal parts
from contamination.

Warning

Do not plug exhaust port of relieving type regulators.
Relief feature will fail if exhaust port is plugged.

ADJUSTMENT

1. Before applying inlet pressure to regulator, turn pilot
regulator adjustment counterclockwise to remove all force
on regulating spring.

2. Apply inlet pressure, then turn pilot regulator 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.

NOTE

With non-relieving regulators, make pressure
reductions with some air flow in the system. If made
under no flow (dead-end) conditions, the regulator
will trap the over-pressure in the downstream line.

DISASSEMBLY

1. Regulator can be disassembled without removal from air
line.

2. Shut off inlet pressure to pilot regulator and to the R18.
Reduce pressure in inlet and outlet lines to zero.

3. Turn pilot regulator adjustment counterclockwise to remove
all force on regulating spring.

4. Disassemble the R18 in general accordance with the item
numbers on exploded view.

CLEANING

1. Clean parts with warm water and soap

2. Rinse and dry parts. Blow out internal passages in body
(22) with clean, dry compressed air.

3. Inspect parts. Replace those found to be damaged.

ASSEMBLY

Note

Early and current diaphragms (16, 17) are not
interchangeable. When replacing a diaphragm, make
sure the new one is identical to the used one. In
addition, the bonnet (11) used with the current
diaphragm (17) has a hole drilled on the inside to accept
the upper piston on the diaphragm.

1. Lubricate o-rings and surfaces in contact with o-rings with
a light coat of good quality o-ring grease.

2. Lubricate threads on bottom plug (24) with a small amount
of anti-seize compound.

3. Assemble the unit as shown on the exploded view. Hold
diaphragm (16, 17) against upper travel limit, then apply
increasing torque to the 10 bonnet screws in a crisscross
pattern. Apply final torque of 13,6 to 14,7 Nm (120 to 130
inch-pounds). Tighten bottom plug (24) hand tight.

TECHNICAL DATA

Fluid: Compressed air
Inlet pressure range: 0,7 bar (10 psig) minimum to 31

bar (450 psig) maximum

Operating temperature: -34° to +80°C (-30° to

+175°F). Air supply must be dry enough to avoid
ice formation at temperatures below +2°C (+35°F).

Typical flow with 0,7 bar (100 psig) inlet pressure, 6,3

bar (90 psig) set pressure, and a droop of 1 bar
(15 psig) from set: 944 dm

3

/s (2000 scfm)

Gauge and pilot ports:

1/4" PTF with PTF main ports
G1/4 with ISO G main ports
R1/4 with ISO Rc main ports

Exhaust port:

3/4" PTF with PTF main ports
G3/4 with ISO G main ports
R3/4 with ISO Rc main ports

Materials:

Body, Bonnet,Bottom Plug, Valve: Aluminum
Elastomers: Nitrile

REPLACEMENT ITEMS

R18 service kit (items circled exploded view)..........5945-40

Exhaust muffler

3/4 PTF ...............................................................MB006A

R3/4 .....................................................................MB006B

INSTALLATION

1. Shut off air pressure. Install regulators in air line -

● upstream of lubricators and cycling valves.

● at any angle.

● install the R18 pilot operated regulator as close as

possible to the device being serviced.

● install the pilot regulator at any convenient, accessible

location.

2. Use pipe thread sealant on male threads only when
making the following pipe connections. Do not allow
sealant to enter interior of regulators.

● Connect inlet and outlet air lines to R18 main ports

with air flow in direction of arrow on body.

● Connect inlet and outlet air lines to pilot regulator main

ports. The inlet port of the R40 and R41 is marked IN,
and the outlet port is marked OUT. The direction of air
flow thru the 11-104 pilot is indicated by an arrow on
the bottom of the body. If desired, inlet air for the pilot
regulator may be tapped from the R18 regulator at the
R18 port marked PRI. When the PRI port is used to
supply air to the pilot regulator, inlet pressure to the
R18 must not exceed the maximum rated pressure of
the pilot regulator.

● Connect the outlet of the pilot regulator to the port

marked PILOT on the R18 regulator. This is the pilot
pressure line.

3.Special Instructions for a Feedback Pilot Regulator:

Connect one end of the feedback line to the feedback port
on the pilot regulator. The feedback port on the R41 is
marked FDBK. The 11-104 has two 1/8" PTF feedback
ports. Plug the unused feedback port. Connect the other
end of the feedback line to a gauge port on the R18 or, if
maximum precision pressure regulation is desired, to the
application point downstream of the R18. Keep the
feedback line as short as possible and unrestricted. Use
1/4" or 3/8 "OD copper tube for the feedback line. Plug
unused gauge ports.

Warning - Feedback Pilot Regulators

Norgren manufacturers two feedback pilot regulator
types (the R41 and the 11-104). Use the R41, the 11­104-002, or the 11-104-003 feedback pilot regulator to
control outlet pressures greater than 100 psig (7 bar).
Use the Norgren 11-104-001 feedback pilot regulator
to control outlet pressures at or less than 100 psig (7
bar).

The feedback line must sense R18 outlet pressure
and must be connected before turning on air pressure.
If the feedback line is not connected, R18 outlet
pressure will rapidly increase to inlet pressure when
the feedback pilot adjusting knob is turned clockwise.

4.

Install a pressure gauge in a gauge port on the R18, or to the
application point downstream of the R18. Do not connect the
gauge to the pilot pressure line, as this pressure is not the
same as the R18 outlet pressure. Locate the gauge next to
the pilot regulator. Plug unused gauge ports.

5. Install a general purpose filter upstream of the regulator.

© Norgren 2001

IM-350.230.01

(5/01)

Pilot Operated Regulator

R18 - ★00 - ★★X★

Thread Form

A....PTF

B....ISO Rc taper

G....ISO G parallel

Port

B....1-1/2"

C....2"

Relief Type

R....Relieving

N....Non relieving *

Gauge

G....With

N....Without

* Do not use a feedback type pilot regulator with a non relieving R18 regulator.

Figure 2. Conventional Pilot Installation

Figure 1. Feedback Pilot Installation

a subsidiary of IMI plc

Inlet

Air

Inlet Air

Inlet

Air

R18 PILOT
OPERATED
REGULATOR

11-104 FEEDBACK
PILOT REGULATOR

Feedback
Line

Pilot Pressure Line

R41 FEEDBACK
PILOT REGULATOR

Pilot
Pressure
Line

8

9

16

21

20

Feedback
Line

Outlet
Air

Inlet Air

Inlet Air

12
13
14

30

18

33

31

32

R40 CONVENTIONAL
PILOT REGULATOR

7

10

11

15

17

19

22

29

28

27

26

25

24

23

Pilot
Pressure
Line

R18 PILOT
OPERATED
REGULATOR

Outlet

Air

R18

Installation & Maintenance

Instructions

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.

© Norgren 2001

IM-350.230.02

(5/01)

Pilot Operated Regulator

a subsidiary of IMI plc