Azbil VDC - Page 50

Parts Replacement Azbil Corporation
6-14 VDC, VAC, VST, VAA - Diaphragm Control Valve
6-6-4 : Disassembling Spring unit
<disassembly procedure>
Disassembly procedure of spring unit is described herein.
Refer to Figure 6-12 for disassembling information.
Disassembling is not required if only piston's sealing parts (tape liner, O ring) are
replaced.
1. Removing spring unit
Step 1) Loosen hexagon nuts 52 (four on top) and remove
Step 2) Remove stopper retainer 53
Step 3) Evenly loosen hexagon nuts 52 (four on bottom) until tension of springs 54
and 55 becomes zero.
CAUTION
Follow disassembly procedure of spring unit when removing bolts and nuts.
Otherwise, ying out of spring may cause injury.
Step 4) Remove spring retainer 59
Step 5) Remove springs (large 54, small 55)
2. Removing piston unit
Step 1) Loosen stopper 60 and remove
Step 2) Loosen detent nut 61 and remove.Take advantage of double width of rod
58.
Step 3) Remove spring washer 62, O-ring 61.Exercise care so as not to damage
O ring with rod's screw.
Step 4) Separate rod 58 from piston 57.