GX Valve and Actuator
Instruction Manual
Form 5770
June 2006
17
GE11642-1
AIR-TO-CLOSE, SPRING-TO-OPEN
AIR-TO-OPEN, SPRING-TO-CLOSE
STUD AND
NUT (4)
STUD AND
NUT (4)
LOCKING
SCREW
LOCKING
SCREW
Figure 5. Design GX Handwheel Assembly
AIR-TO-CLOSE, SPRING-TO-OPEN
AIR-TO-OPEN, SPRING-TO-CLOSE
GE11643-1
GREASE ZERK
APPLY LITHIUM
GREASE
GREASE ZERK
APPLY LITHIUM
GREASE
OPERATING
NUT
OPERATING
NUT
STEM
CONNECTOR
STEM
CONNECTOR
ACTUATOR
ROD
ACTUATOR
ROD
LEVER (2)
LEVER (2)
APPLY
LITHIUM
GREASE
TO LEVERS
APPLY
LITHIUM
GREASE
TO LEVERS
Figure 6. Design GX Handwheel Orientation and Grease Zerk Location
Handwheel Operation
Principle of Operation
The Design GX handwheel is designed to compress
the actuator springs and override the actuator fail
action. Turning the handwheel drives the screw, nut,
and levers. The levers push against the stem
connector to transfer this motion. Reversing the
direction of the handwheel will move the nut and
levers in the opposite direction. Once the levers are
no longer in contact with the stem connector, the
locking screw should be used to secure the
handwheel against undesired movement. To prevent
