Norgren R38 Installation Instructions

R38

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 adjustment screw counterclockwise to remove all
force on regulating spring (6).

4. Disassemble 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
(16) with clean, dry compressed air.

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

ASSEMBLY

1. Lubricate threads of adjusting screw (1), recess of upper
sprint rest (5), and o-rings with a light coat of good quality
o-ring grease.

2. Assemble the unit as shown on the exploded view.
Assemble bonnet (3) to body (16) so that relief hole is
above outlet port.

3. Torque Table
Item Nm (Inch-Pounds)
4, 8 (screw) 3,3 to 7,3 (30 to 66)

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
Maximum pressure: 20 bar (290 psig)
Operating temperature*:

-40° to +80°C (-40° to +176°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, 1 bar

(15 psig) set pressure and 0,05 bar (1 psig) droop from
set: 8 dm

3

/s (17 scfm)

Maximum bleed flow at 2 bar (30 psig) outlet pressure

(relieving models only): 1,5 cm3/s (0.003 scfm)
Gauge ports: 1⁄4", thread form same as main ports
Materials:

Body, bonnet, base: Aluminum

Adjusting screw: Steel

Elastomers, diaphragm: Nitrile

REPLACEMENT ITEMS

Service Kits (includes items circled on exploded view):
Relieving

2 bar (30 psig) regulating spring ........................R38-100R

4 and 7 bar (60, 100 psig) regulating spring....R38-101R

Non relieving

2 bar (30 psig) regulating spring......................R38-100NR

4 & 7 bar (60, 100 psig) regulating spring.....R38-101NR

PANEL MOUNTING DIMENSIONS

Panel mounting hole diameter: 42 mm (1.65")
Maximum panel thickness: 6 mm (0.24")

INSTALLATION

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

● with air flow in direction of arrow on body,

● 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. Do not allow sealant to enter interior

of unit.

3. Install a pressure gauge or plug the gauge ports. Gauge

ports can also be used as additional outlets for regulated

air.

4. Install a Norgren general purpose filter with a 5 micron

element upstream of the regulator.

ADJUSTMENT

1. Before applying inlet pressure to regulator, turn adjustment

(1) counterclockwise to remove all force on regulating

spring (6).

2. Apply inlet pressure, then turn adjustment (1) clockwise to

increase and counterclockwise to decrease outlet 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.

4. Once required pressure is achieved tighten locknut (2) to

lock setting.

© Norgren 2002

IM-418.220

(3/02)

Supersedes (1/99)

* 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.

Aluminum Instrument Regulator

R38 - 2★★ - ★★★★

Material

0....Aluminum with Nitrile

elastomers

1....Aluminum with Viton

elastomers

Port

2....1/4"

Spring (Outlet Pressure Range) *

C....0,04 to 2 bar (0.6 to 30 psig)

F ....0,07 to 4 bar (1 to 60 psig)

K....0,25 to 7 bar (3,6 to 100 psig)

Thread Form

A....PTF

B....ISO Rc taper

D....ISO G

K....API

Diaphragm Type

N....Non-Relieving

R....Relieving

Gauge

N....Without

Mounting Options

0....None

1....Bracket and nut

2....Nut only

3....Handwheel and nut

4....Handwheel with bracket and nut

5....Handwheel

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