Finish machining of stem nut (output drive type A):
The output drive flange does not have to be removed from the actuator.
.
Remove spigot ring (80.2, figure B-1) from mounting flange.
.
Take off stem nut (80.3) together with thrust bearing (80.01) and thrust
bearing races (80.02).
.
Remove thrust bearing and thrust bearing races from stem nut.
.
Drill and bore stem nut and cut thread.
When fixing in the chuck, make sure stem nut runs true!
.
Clean the machined stem nut.
.
Apply Lithium soap EP multi-purpose grease to thrust bearing and races,
then place them on stem nut.
.
Re-insert stem nut with thrust bearings into the mounting flange. Ensure
that dogs are placed correctly in the slots of the hollow shaft.
.
Screw in spigot ring until it is firm against the shoulder.
.
Press Lithium soap EP multi-purpose grease on mineral oil base into the
grease nipple with a grease gun (for quantities, please refer to table):
Protection tube for rising valve stem
.
Protection tubes may be supplied separately. Seal thread with hemp,
Teflon tape, or thread sealing material.
.
Screw protection tube (1) into thread (figure B-2) and tighten it firmly.
.
Push down the sealing (2) to the housing.
.
Check, whether cap (3) is available and without damage.
9
Multi-turn actuators SAN 07.1 – SAN 25.1/SARN 07.1 – SARN 25.1
Operation instructions
for valve automation in nuclear power plants
Figure B-1
80.3
80.2
Output drive type A
Stem nut
80.01/80.02
Figure B-2: Protection tube for rising valve stem
3
1
2
Output
drive
A 07.2
A 10.2
A 14.2
A 16.2
A 25.2
Qty
1)
1.5 g
2 g
3 g
5 g
10 g
1) For grease with density
ρ
= 0.9 kg/dm³
Table 3: Grease quantities for lubricating bearings
