Azbil Corporation
Model: AMT, HDT - CV3000 Series Control Valves
46
7.2.2 Disassembly and Assembly of Top Handwheel
To disassemble or assemble the top handwheel, refer to Fig. 7-5 through 7-10 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.
(b) Reverse Action Type
(1) Disconnect the air piping.
(2) Set the handwheel shaft in the automatic operation position (fully lower the
handwheel shaft).
(3) Remove the handwheel and the lock nut. Insert the shaft into the housing by
means of the threading until the threading sections are disengaged.
(4) 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 use.
(5) Remove the housing by loosening its clamping-screws.
(6) Remove the setscrew and then remove the bearing case.
(7) Remove the pin and then remove the castle nut.
(8) Remove the bearing retainer and then remove the bearing.
To assemble the top handwheeI, follow the disassembly procedure in the reverse
order.
(c) Inspection After Assembly
(1) Check that the handwheel turns smoothly for the full stroke.
(2) For the direct action type of actuator, check by means of soapsuds that there
is no air leak from the connecting sections of the housing and top diaphragm
case.
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