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Diaphragm size 25
The product has 2 control medium connectors.
Control function
Control medium
connector 2 (open)
1 (NC)
+ = available
– = not available
Normally closed (NC):
Actuator resting position: closed by spring force. Activation of
the actuator (connector 2) opens the actuator. When the actu-
ator is vented, the actuator is closed by spring force.
12.2 Connecting the control medium
1. Use suitable connectors.
2. Connect the control medium lines tension-free and
without any bends or knots.
Thread size of the control medium connectors
Diaphragm size 8–10: G 1/8
Diaphragm size 25: G 1/4
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Vent hole
Control medium connector 2
Leak detection hole
Control medium
connector 4 (close)
+
-
13 Stroke limiter and seal adjuster
▶ Only set the seal adjuster when the valve is completely
assembled (with diaphragm and valve body) and in a cold
condition.
The valves have a mechanical seal adjuster as standard to
protect the sealing diaphragm against excessive closing
force.
Standard setting:
The valve is sealed when the handwheel is completely closed
(turned fully clockwise).
13.1 Setting the seal adjuster (GEMÜ 650 0TL)
Fig. 4: Seal adjuster GEMÜ 650 0TL
1.
Open the valve approx. 50%.
2.
Loosen, unscrew and remove the screw 6.
3.
Pull up the handwheel H.
4.
Loosen, unscrew and remove the adjusting ring 4.
5.
Depending on the operating conditions, regrease the actu-
ator spindle S, especially a valve that is autoclaved.
GEMÜ recommends the Boss-Fluorine Y 108/00 grease
(99099484).
6.
Place the handwheel H on the actuator spindle S.
7.
Move the valve to the closed position.
8.
Pull off the handwheel H from the actuator spindle S.
9.
Screw the adjusting ring 4 onto the actuator spindle S un-
til the bottom side of the adjusting ring 4 is flush with the
actuator A.
10. Put the handwheel H onto the actuator spindle S (take
care to align the hexagon of the adjusting ring 4 and the
double-hexagon of the handwheel H).
11. Fasten the handwheel H with the screw 6.
29 / 42
13 Stroke limiter and seal adjuster
NOTICE
6
H
4
S
A
GEMÜ 650TL
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