Operation; 11.7.1 Pneumatic Actuators; 11.7.2 Manual Operators - GEM 553 Installation, Operating And Maintenance Instruction

11.7

Operation

11.7.1 Pneumatic actuators

The pneumatically operated valves are
equipped with an optical position indicator
as standard that indicates whether the
position of the valve is OPEN or CLOSED
(only control function 1: Normally closed).
Valve open
Optical position indicator for the
pneumatic stainless steel actuator
Valve open
Optical position indicator for the
pneumatic plastic actuator

11.7.2 Manual operators

CAUTION
Handwheel can become hot
during operation!
® Risk of burns!
Ensure protective gloves
G
are worn when operating
handwheel.
CAUTION
Rising handwheel!
® Danger of crushing fi ngers.
Valve closed
Valve closed
55 / 68
Control function code L
With counter nut to fix the valve positon.
Handwheel
Counter nut
1. Move handwheel to the required position
2. Turn the counter nut anticlockwise.
® Handwheel is fi xed.
The manually operated valves do not feature
optical position indicators. The position of
the valves can be read using the handwheel.
Valve open
Manual operator with plastic handwheel
Valve closed
553