Norgren F74G User Manual

SERVICING

1. Open manual drain to expel accumulated liquids. Keep
liquids below baffle (51).

2. Clean or replace filter element when dirty, when optional
mechanical service indicator shows approximately all
red, or when optional electrical service indicator provides
an electrical output.

DISASSEMBLY

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

2. Shut off inlet pressure. Reduce pressure in inlet and
outlet lines to zero.

3. Remove bowl - push into body and turn
counterclockwise.

4. Disassemble in general accordance with the item
numbers on exploded view. Do not remove the drains or
the service indicators (1, 7) unless replacement is
necessary. Remove and replace only if they malfunction.

CLEANING

1. Clean plastic bowl (25, 42) and lens (3, 36, 47) with
warm water only. Do not submerge electrical service
indicator (7) in water. Clean indicator (7) with dry, clean
cloth. Clean other parts with warm water and soap.

2. Rinse and dry parts. Blow out internal passages in body
(6) 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.

ASSEMBLY

1. Lubricate o-rings, the portion of the manual drain body
(18, 28) that contacts the bowl, and the hole in the
manual drain body that accommodates the stem of drain
valve (19, 29) with o-ring grease.

2. Assemble filter as shown on the exploded view.

3. Arrows on indicator (3, 9) and body (6) must point in
same direction. Screw baffle (51) onto center-post (53)
until contact is made with element (52), then tighten an
additional 1/4 turn. Push bowl, or bowl with guard, into
body and turn fully clockwise.

4. Torque Table Torque in N-m (Inch-Pounds)
2, 8 (Screw) 2,8 to 3,9 (25 to 35)
22, 32 (Nut) 2,3 to 2,8 (20 to 25)
34, 45 (Screw) 1,7 to 2,3 (15 to 20)
53 (Center-post) 2,0 to 2,7 (18 to 24)

CAUTION

Water vapor will pass through these units and could
condense into liquid form downstream as air temperature
drops. Install an air dryer if water condensation could have
a detrimental effect on the application.

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.

Polycarbonate plastic bowls can be damaged and
possibly burst if exposed to such substances as certain
solvents, strong alkalies, compressor oils containing ester­based additives or synthetic oils. Fumes of these
substances in contact with the polycarbonate bowl,
externally or internally, can also result in damage. Clean
with warm water only.

Use metal bowl in applications where a plastic bowl
might be exposed to substances that are incompatible with
polycarbonate.

Before using these products with fluids other than air,
for nonindustrial applications, or for life-support systems
consult Norgren.

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 a 40 µm element at 6,3 bar (90 psig) inlet

pressure and 0,5 bar (7 psig) pressure drop: 83 dm

3

/s

(176 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

3

/s (2 scfm)

Manual operation: Depress pin inside drain outlet to

drain bowl
Materials:

Body: Aluminum
Bowl:

Transparent with guard: Polycarbonate, steel guard

Metal: Aluminum

Metal bowl liquid level indicator lens: Transparent nylon

Element: Sintered polypropylene
Elastomers: Neoprene and nitrile
Mechanical service indicator materials:

Body: Transparent nylon

Internal parts: Acetal

Spring: Stainless steel

Elastomers: Nitrile

REPLACEMENT ITEMS

Service kit (includes items circled on

exploded view) ...................................................4380-700

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

Mechanical service Indicator (1)..............................5797-50

Electrical service Indicator (7) ...............................4020-51R

INSTALLATION

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

● vertically (bowl down),

● with air flow in direction of arrow on body,

● upstream of regulators, lubricators, and cycling valves,

● as close as possible to the air supply when used as a

main line filter,

● as close as possible to the device being serviced when

used as a final filter.

2. Connect piping to proper ports using pipe thread sealant

on male threads only. Do not allow sealant to enter

interior of unit.

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

connected to the automatic drain. Avoid restrictions in

the tube.

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

clockwise before pressurizing.

© Norgren 1998

F74G

Installation & Maintenance

Instructions

General Purpose Filter

F74G - ★★★ - ★★★

Thread Form

A....PTF

B....ISO Rc taper

G....ISO G parallel

Bowl

D....Metal with liquid level indicator

P....Transparent with guard

Element

1....5 µm

2....25 µm

3....40 µm

Drain

A....Automatic

Q....Manual, 1/4 turn

Service Indicator

D....With mechanical service indicator

E....With electrical service indicator *

N....Without indicator

Port

3....3/8"

4....1/2"

6....3/4"

* See Norgren publication IM-900.920 for specifications and electrical wire connections of the optional electric service indicator.

IM-200.100

(9/98)

Supersedes 4/98

a subsidiary of IMI plc

6

54

Used on
models
prior to
1998

53

52

51

17

27

28

30

29

Early Plastic Bowl Early Metal Bowl

40

42

43

41

Current Plastic Bowl

21

18

23

20

19

22

Current Metal Bowl

31

33

32

1

7

1112

8

9

10

13

38

39

37

36

49

50

48

47

2

4

3

5

26

25

24

35

34

44

46

45