Instruction Manual
D103175X012
GX Valve and Actuator
April 2011
23
During normal pneumatic operation when the handwheel is not needed, a locking screw (see figure 6) is provided on
the side of the handwheel housing to lock the handwheel levers out of the way.
WARNING
To avoid personal injury or equipment damage due to possible sudden shifting or falling of the valve assembly, do not lift
the valve assembly by the handwheel.
GX Handwheel Installation (for use with 20mm travel only)
1. Note the orientation of the levers to the stem connector for either the air‐to‐close, spring‐to‐open configuration or
for the air‐to‐open, spring‐to‐close configuration, as shown in figure 7.
2. Adjust the handwheel to allow positioning the levers above the stem connector before installation.
3. Install the handwheel to the GX mounting pad with four studs and nuts, as shown in figure 6. Torque to 24 N
S
m (18
lbf
S
ft).
4. Apply lithium grease to the grease zerk and to the tip of the levers (where they contact the stem connector), as
shown in figure 7.
Travel Stop Operation
Principle of Operation
CAUTION
This travel stop is designed only for use with size 225 and 750 actuators with 20 mm travel. To avoid equipment damage, do
not assemble this travel stop on size 750 actuators with 40 mm travel or size 1200 actuators.
The GX travel stop is designed to mechanically limit and stop the valve at a preset position in an emergency or upon
loss of instrument air. This assembly is mounted on the yoke with four studs. The lever pushes against the stem
connector to stop the travel. Travel position can be adjusted by two adjustable cap screws on the lever, as shown in
figure 8. A cover plate assembly is available to prevent pinch point damage caused by the lever, as shown in figure 8.
WARNING
To avoid personal injury or equipment damage due to possible sudden shifting or falling of the valve assembly, do not lift
the valve assembly by the travel stop.
To avoid personal injury or loss of process control due to equipment damage, screw the adjustable cap screws to ensure the
lever is completely disengaged while the valve is in normal pneumatic operation.
