7-5
7-2. Model HA2, HA3, or HA4 actuator
7-2-1. Operating instructions
To manually operate the actuator, refer to Figure 7-5 through Figure 7-8 and proceed as
follows:
(1) First, loosen the lock nut (which has a bar-shape handle and which locks the handwheel,
and turn the handwheel in the direction indicated by the corresponding arrowhead mark.
As you turn the handwheel clockwise, the actuator stem moves downward regard.less 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.
(2) For automatic operation of the actuator, fully raise the handwheel if the actuator is of the
direct action type or fully lower the handwheel if the actuator is of the reverse action type,
and then tighten the lock nut to secure the handwheel in such position.
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 HA2: 190N {19kgf}
Model HA3: 260N {26 kgf}
Model HA4: 410N {41 kgf}
(at the outermost periphery of the handwheel)
7-2-2. Disassembly and assembly of top handwheel
To disassemble or assemble the top handwheel, refer to Figure 7-5 through Figure 7-9 and
proceed as described in this section. For disassembly and assembly work, keep the actuator in
the vertical attitude.
(a) Direct action type
(1) Disconnect the air piping.
(2) Set the handwheel shaft in the automatic operation position (fully raise the handwheel
shaft).
(3) Remove the top diaphragm case. When doing this, loosen the pair of eyebolts uniformly
and alternately, after removing all other clamping-bolts of the diaphragm case.
(4) Sufficiently insert the handle shaft by turning it and then remove the handwheel and the
lock nut. Insert the shaft further and then remove the screw shaft from the housing.
(5) Remove the O-ring.
To assemble the top handwheel, follow the disassembly procedure in the reverse order.
Azbil Corporation Safety
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