Optical Position Indicator; Connecting The Control Medium; Adjusting The End Positions - GEM 751 Installation, Operating And Maintenance Instructions

Control function 2
Normally open (NO)
Ball valve resting position: opened by
spring force. Activation of the actuator
(connector 4) closes the ball valve. When
the actuator is vented, the ball valve is
opened by spring force.
Control function 3
Double acting (DA)
Ball valve resting position: undefined. The
valve is opened and closed by activating
the respective control medium connectors
(connector 2: open / connector 4: close).
Control function
1 (NC)
2 (NO)
3 (DA)
+ = available / - = not available
(for connectors 2 / 4 see picture chapter 10.4)
10.3

Optical position indicator

Open
10.4 Connecting the
control medium
Important:
Connect the control medium lines
tension-free and without any bends
or knots!
Use appropriate connectors
according to the application.
Thread size of the control medium
connectors: G1/4
Connectors
2 4
+ -
- +
+ +
Closed
1
Remove the protection cap 1.
G
Screw the control medium line 3 into
G
control medium connector 2.
If appropriate, screw the second control
G
medium line into control medium
connector 4.
Alternative:
Mount solenoid valve
G
(for double acting actuators:
GEMÜ 8506 5/2-way or
GEMÜ 8506 5/3-way,
for single acting actuators:
GEMÜ 0324 3/2-way).
Control function
1 Normally closed (NC)
2 Normally open (NO)
3 Double acting (DA)
For connectors 2 / 4 see picture above
10.5

Adjusting the end positions

The end positions can be set by ± 20°
(+5°/-15°).
31 / 44
2 4
3
Connectors
2: Control medium (open)
4: Control medium (close)
2: Control medium (open)
4: Control medium (close)
751 ... D