GB-3
D
GB
F
NL
I
E
Maintenance
CAUTION
In order to ensure smooth operation: clean or re-
place the filter pad of the GFK every year, or every
six months if operated with biologically produced
methane.
When cleaning or replacing the filter pad, no dirt
may contaminate the clean gas circuit.
▷
The filter pad should be changed at a pressure
gradient ≥ 20 mbar (8 "WC).
▷
Pressure test points on the cover:
GFK 15 to 100:
Inlet side: Rp 1/8 pressure test nipple,
Outlet side: Rp 1/8 pressure test nipple.
GFK 125 to 250:
Inlet side: Rp 1/8 plug,
Outlet side: Rp 1/8 plug.
GFK 15T to 100T:
Inlet side: Rp 1/8 plug,
Outlet side: Rp 1/8 plug.
Recommended ∆
p
max. = 20 mbar
Cleaning or replacing the filter pad
1
Shut off the gas supply.
5
2
3
4
8
6
7
10
11
9
Clean or
replace the
filter pad.
Fit the filter
pad into the
groove in the
cover.
▷
Tighten screws in a crosswise fashion and pay
attention to the torque, see table:
Type
Torque [Nm]
GFK 15
5
GFK 20
5
GFK 25
8
GFK 32
8
GFK 40
8
GFK 50
8
GFK 65
8
GFK 80
20
GFK 100
20
GFK 125
60
GFK 150
60
GFK 200
80
GFK 250
80
Checking tightness and function
▷
When replacing the filter pad, the gas-filled space
in the GFK is opened. Therefore, check for tight-
ness once the filter pad has been reinstalled.
1
To be able to check the tightness, shut off the
downstream pipeline close to the gas filter.
≤
1,2 x p
u max
N
2
14
13
15
Tightness OK: open the pipeline.
Technical data
Gas type: natural gas, town gas, LPG (gaseous),
biologically produced methane and air.
Max. inlet pressure p
u max
:
GFK 15 to 250: 1 bar (14.5 psig),
GFK 15R to 65R: 4 bar (60 psig),
GFK 15TN to 100TN: 4 bar (60 psig),
GFK 40F to 100F: 6 bar (87 psig).
Storage temperature: -15 to +60°C (5 to 140°F).
Ambient temperature: -15 to +80°C (5 to 176°F).
Continuous operation at high temperatures ac-
celerates the ageing of elastomer materials.
Version to DIN 3386.
Housing material:
GFK 15 to 100: AlSi.
GFK 125 to 250: sheet steel.
Connection:
GFK..R: Rp internal thread connection to ISO 7-1.
GFK..F: flanged connection to ISO 7005, PN 16.
GFK..N: NPT internal thread.
GFK..A: ANSI 150 flanged connection.
Filter pad: polypropylene fleece (standard 50 μm).