Azbil VDC - Page 47

Azbil Corporation Parts Replacement
VDC, VAC, VST, VAA - Diaphragm Control Valve 6-11
2. Removing slide screw detent
Step 1) Loosen hexagon head bolt 50 and hex nuts 51 which fasten slide screw
detent 49
Step 2) Remove slide screw detent 49
3. Removing spring retainer
Step 1) Loosen hexagon nuts 2 and eye nut 1 on the top of actuator and remove.
Step 2) Lift spring retainer 17 straight up and remove.
4. Removing lift stopper and spring unit
Step 1) Loosen hexagon stay 4, 9 (four) which fasten lift stopper 20 and cylinder
21 and remove
Step 2) Raise lift stopper 20 straight up and remove.
Step 3) Install eyebolts on threaded holes on the spring retainer 59 which
is located on the top of spring unit (M12 x 2) and lift spring unit
(approximately 120 kg) up with a crane.
Step 4) While suspended by crane, remove piston's 57 sealing parts (tape liner 7,
O-ring 8)
5. Removing slide screw and cylinder
Step 1) Turn slide screw 34 by hand and extract from the bottom
Step 2) Loosen hexagon head bolts 12 (four) which fasten cylinder and manual
handwheel and remove.
Step 3) Lift cylinder up straight and remove.
6. Removing worm unit
Step 1) Remove in the sequential order of bearing holder 27, single column
angular bearing, (upper) 32, worm wheel 33, and single column angular
bearing (lower) 32.
Step 2) Loosen hexagon head bolts 12 (four), which fasten gear, case 30 and
yoke and remove.