IMI NORGREN R74G Installation and operating 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 (1 or 7) fully counterclockwise.
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
with clean, dry compressed air.
3. Inspect parts. Replace those found to be damaged.
ASSEMBLY
1. Lubricate o-rings, valve stem (17), adjusting screw
threads and tip (5, 7) and the outer circumference and
both sides of the thrust washer (4) with a light coat of
good quality o-ring grease.
2. Assemble the unit as shown on the exploded view.
3. Torque Table
Item Torque in Nm (Inch-Pounds)
2, 10 (Screw) 2,8 to 3,9 (25 to 35)
23 (Reverse flow valve on
R74R models) 0,7 to 1,1 (6 to 10)
14 (Bottom plug) 2,3 to 3,4 (20 to 30)
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 (300 psig)
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 10 bar (150 psig) inlet pressure, 6,3 bar
(90 psig) set pressure and 1 bar (15 psig) droop from
set: 105 dm3/s (220 scfm)
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: Brass
Elastomers: Nitrile
Bottom plug: Acetal
REPLACEMENT ITEMS
Service kit (includes items circled on exploded view)
Relieving.............................................................4381-700
Non-relieving......................................................4381-701
Tamper resistant cover and wire ..............................4355-51
PANEL MOUNTING DIMENSIONS
Panel mounting hole diameter: 52 mm (2.06")
Panel thickness: 2 to 6 mm (0.06" to 0.25")
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. R74R
reverse flow regulators can be installed upstream or
downstream of 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 regulator.
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 upstream of the
regulator.
ADJUSTMENT
1. Before applying inlet pressure to regulator, turn
adjustment (1 or 7) counterclockwise to remove all force
on regulating spring.
2. Apply inlet pressure, then turn adjustment (1 or 7)
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.
4. KNOB ADJUSTMENT. Push knob down to lock pressure
setting. Pull knob up to release. Install tamper resistant
cover and wire (see
Replacement Items ) to make setting
tamper resistant.
5. T-BAR ADJUSTMENT. Tighten lock nut (8) lock pressure
setting.
IM-200.200 (4/98)
a subsidiary of IMI plc
© Norgren 1998
1
13
7
8
9
10
11
6
2
3
4
5
12
21
22
17
15
18
16
14
19
20
23 (R74R only)
R74G, R74R
Installation & Maintenance
Instructions
Pressure Regulator
R74★- ★★★ - ★★★
Thread Form
A....PTF
B....ISO Rc taper
G....ISO G parallel
Port
3....3/8"
4....1/2"
6....3/4"
Flow Type
G....Uni-directional
R.... Reverse
Spring (Outlet Pressure Range) *
F ....0,3 to 4 bar (5 to 60 psig)
M...0,3 to 10 bar (5 to 150 psig)
S....0,7 to 17 bar (10 to 250 psig)
Gauge
G....With
N....Without
Diaphragm
N....Non-relieving
R....Relieving
Adjustment
K....Knob
T....T-bar
* 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.

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