8-1
Chapter 8.
Instructions for Side Handwheel of Actuator
As you turn the handwheel clockwise, the actuator stem moves downward regardless of
whether the actuator is of the direct action type or reverse action type. The handwheel bears
the ''SHUT' mark to indicate that the valve is closed as the handwheel is tuned clockwise
and the "OPEN'' mark to indicate that the valve is made open as the handwheel is tuned
counterclockwise.
8-1. Installation procedure
To install the side handwheel, refer to Figure 8-1 and proceed as follows:
(1) Prepare a manual operation kit (a side handwheel set and its mounting accessories).
To install the handwheel, no machining or other physical processing on the actuator is
necessary.
(2) By turning the handwheel, set the pointer of the operation nut at the AUTO position.
(3) Loosen the bolt (item number 6 as-show in Figure 8-1) and widen the distance between
levers.
(4) Install the handwheel on the mounting pad at the back of the actuator, with the
mounting-bolts.
(5) Engage the holes at the end of two levers to the pointer boss and engage those of the other
ends to the boss of the operation nut, and then tighten the bolt.
(6) When the control valve is in the automatic mode of operation, set the pointer of the
operation nut at the AUTO position and keep the handwheel locked.
8-2. Operating instructions
(1) To manually operate the actuator, remove the handwheel lock (the fork-shaped
component) which locks the handwheel and turn the handwheel in the direction
indicated by the corresponding arrowhead mark.
(2) To return to the automatic operation, turn the handwheel so that the pointer of the
operation nut is set at the AUTO position and then apply the handwheel lock.
Precautions: If you forcefully turn the handwheel after it has reached the mechanical
stop position, the valve stem may be damaged. Do not turn the handwheel
with forces larger than the below-mentioned limits.
Model PSA1: 80N {8kgf}
Model HA2: 190N {l9kgf}
Model HA4: 290N {29kgf}
Model HA4: 460N {46kgf}
(at the outermost periphery of the handwheel)
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