Norgren B74G Series Installation Instructions User Manual

B74g

B74G

Installation & Maintenance

Instructions

Filter/Regulator

B74G -

★★★ - ★★★ - ★★★

Thread Form
A....PTF
B....ISO Rc taper
G....ISO G parallel

INSTALLATION
1. Shut off air pressure. Install filter/regulator in air line -

●

vertically (bowl down),

●

with air flow in direction of arrow on body,

●

upstream of lubricators and cycling valves,

●

as close as possible to the device being serviced.

2. Connect piping to proper ports using pipe thread sealant

on male threads only. Do not allow sealant to enter
interior of unit.

3. Push bowl, or bowl with guard, into body and turn fully

clockwise before pressurizing.

4. Flexible tube with 3mm (0.125") minimum I.D. can be

connected to the automatic drain. Avoid restrictions in
the tube.

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

ports can also be used as additional outlets for regulated
air.

ADJUSTMENT
1. Before applying inlet pressure to filter/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 filter/regulators, make pressure
reductions with some air flow in the system. If
made under no flow (dead-end) conditions, the
filter/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 (see Replacement Items) to make setting tamper
resistant.

5. T-BAR ADJUSTMENT. Tighten lock nut (8) to lock

pressure setting.

SERVICING
1. Open manual drain to expel accumulated liquids. Keep

liquids below baffle (51).

2. Clean or replace filter element when dirty.

DISASSEMBLY
1. Filter/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. Remove bowl - push into body and turn

counterclockwise.

5. Disassemble in general accordance with the item

numbers on exploded view. Do not remove the drains
unless replacement is necessary. Remove and replace
only if they malfunction.

CLEANING
1. Clean plastic bowl (25, 42) with warm water only. Clean

other parts with warm water and soap.

2. Rinse and dry parts. Blow out internal passages in body

(16) with clean, dry compressed air. Blow air through
filter element (52) from inside to outside to remove
surface contaminants.

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

Replace plastic bowl with a metal bowl if plastic bowl
shows signs of cracking or cloudiness.

TECHNICAL DATA
Fluid: Compressed air
Maximum pressure:

Transparent bowl: 10 bar (150 psig)
Metal bowl: 17 bar (250 psig)

Operating temperature*:

Transparent bowl: -20° to +50°C (0° to +125°F)
Metal bowl: -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).

Particle removal: 5 µm, 25 µm, or 40 µm filter element
Air quality: Within ISO 8573-1, Class 3 and Class 5

(particulates)

Typical flow with 10 bar (150 psig) inlet pressure, 6,3 bar

(90 psig) set pressure and 1 bar (15 psig) droop from
set: 100 dm

/s (212 scfm)

Nominal bowl size: 0,2 litre (7 fluid ounce)
Manual drain connection: 1/8"
Automatic drain connection: 1/8"
Automatic drain operating conditions (float operated):

Bowl pressure required to close drain: Greater than 0,3

bar (5 psig)

Bowl pressure required to open drain: Less than 0,2 bar

(3 psig)

Minimum air flow required to close drain: 1 dm

(2 scfm)

Manual operation: Depress pin inside drain outlet to

drain bowl

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
Bowl:

Transparent with guard: Polycarbonate, steel guard
Metal: Aluminum
Metal bowl liquid level indicator lens: Transparent

nylon

Element: Sintered polypropylene
Elastomers: Neoprene and nitrile

REPLACEMENT ITEMS
Service Kit (includes items circled on exploded view):

Relieving.............................................................4383-700
Nonrelieving .......................................................4383-701

Liquid level lens kit (34, 36, 37, 38) ......................4380-050
Filter element, 5µm, red speckles (52).....................4338-04
Filter element, 25µm, blue speckles (52) .................4338-07
Filter element, 40µm, no speckles (52)....................4338-05
Manual drain (18, 19, 20) (28, 29, 30) ......................619-50
Automatic drain (21, 22, 23) (31, 32, 33)

1/8 NPT outlet ......................................................3000-10
G 1/8 outlet ..........................................................3000-97

Tamper resistant cover (knob adjustment only).......4355-51

PANEL MOUNTING DIMENSIONS
Panel mounting hole diameter: 52 mm (2.06")
Panel thickness: 2 to 6 mm (0.06" to 0.25")

Port
3 ....3/8"
4 ....1/2"
6 ....3/4"

* 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) *
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

Drain
A....Automatic
Q....Manual, 1/4 turn

Bowl
D....Metal with liquid level indicator
P....Transparent with guard

Element
1 ....5 µm
2 ....25 µm
3 ....40 µm

Current Metal Bowl

Early Plastic Bowl

Early Metal Bowl

Current Plastic Bowl

Used on
models
prior to
1998

a subsidiary of IMI plc

IM-200.300.01

(9/98)

Supersedes 4/98