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11.3 Setting the seal adjuster
and the stroke limiter
Important:
Only set the seal adjuster and
stroke limiter when the valve
is completely assembled (with
diaphragm and valve body) and in
a cold condition!
GEMÜ 654 bonnet size 0TH
Diaphragm size 8
8
11
6
13
Greased
thread
9
15
4
Setting the seal adjuster
Unscrew locking screw 8 and remove it.
G
Pull off handwheel 7.
G
Loosen locking screw 9 with a SW2 Allen
G
key (do not unscrew it completely).
Unscrew stroke limiting sleeve 5 and
G
remove it.
Loosen lock nut 6 with a SW19 open-end
G
wrench and unscrew it by 2 to 3 turns.
To deactivate the seal adjuster loosen the
G
seal adjuster nut 13 with a SW19 open-
end wrench unscrew it by 2 to 3 turns.
Place handwheel 7 upside down on the
G
double flats of the threaded spindle 15.
Gently close the valve with handwheel 7
("CLOSED position") (valve is tight).
Screw in the seal adjuster nut 13 until it
G
stops and secure with lock nut 6 (SW19
open-end wrench).
653, 654
Setting the stroke limiter
Move the valve to the OPEN position by
G
turning handwheel 7 (upside down) until
the required flow rate is reached.
Pull of handwheel 7 from the threaded
G
spindle 15.
Screw stroke limiting sleeve 5 on until it
G
stops.
Fix the stroke limiting sleeve 5 with
G
locking screw 9 (SW2 Allen key).
7
Push handwheel 7 into its original
G
position on the double flats of the
threaded spindle 15 and secure it with
Greased
locking screw 8.
O-rings
Diaphragm sizes 10 - 50
12
5
10
3
Preparation for setting
Remove protective cap a.
G
Move the bonnet out of the end positions
G
to enable the handwheel to be turned in
both directions.
Releasing the stroke limiter
Turn stroke limiter b anticlockwise
G
upwards until the male thread is visible.
12 / 28
Important:
The threaded spindle 15 must
not turn during this process!
If necessary, hold with a SW8
open-end wrench!
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