Azbil Corporation Parts Replacement
VDC, VAC, VST, VAA - Diaphragm Control Valve 6-15
6-6-5 : Assembling Actuator
<Caution during Assembly>
• Refer to the chapter of inspection items during disassembly and check, the parts
for abnormalities. If found, replace or repair as required.
• O-ring of sliding parts should always be replaced at the time of periodic
disassembly. If O-ring on the xed part is deformed or damaged, or scarred
during disassembly, replace it.
• Clean O ring, oil seal, wearing, tape line O-ring recess and apply plenty of
lubricant.
• Ensure that no dust or dirt from maintenance work prior to disassembly remains
on sliding part of cylinder and guide bushing.
6-6-6 : Assembly of Actuator with Manual Handwheel
Refer to Figure 6-11 for assembly information.
1. Assembly procedure, manual handwheel and cylinder assembly
Step 1) While yoke 29 is in upright position, place gear 30 and temporarily fasten
with hexagon head bolts 12 (four)
Step 2) Apply lubricant on single column angular bearing (top and bottom) and
assemble in the sequential order of bearing (lower) 32, worm wheel 33,
bearing (upper) 32 and bearing holder 31. Refer to the Figure 4-24 below
for details.
Step 3) Insert and screw in from the bottom slide screw 34 with tape liner 13
assembled on. Apply lubricant on threaded parts of slide screw 34.
Step 4) Assemble slide screw 34 with slide screw detent 49, hexagon head bolt 50
and nut 51.
Step 5) Apply lubricant on rod packing 22 and dust seal 24 and assemble on
cylinder 21.
Step 6) Place cylinder 21 on gear case 30 and temporarily fasten by hexagon
head bolts 12 (four) and seal washer 10.
Step 7) Use rod 58 to set the position of cylinder by ensuring that the rod moves
smoothly and tighten by the torque as shown in Table 4-5. If the rod does
not move smoothly, tap cylinder or gear case with plastic hammer and set
the position.
Figure 6-13
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