5.
Mounting to valve/gearbox
.
Prior to mounting the multi-turn actuator must be checked
for damage. Damaged parts must be replaced by original
spare parts.
.
After mounting, check multi-turn actuator for damage to
paint finish. If damage to paint-finish has occurred after
mounting, it has to be touched up to avoid corrosion.
Mounting is most easily done with the valve shaft/gearbox shaft pointing
vertically upward. But mounting is also possible in any other position.
The multi-turn actuator leaves the factory in position CLOSED (limit switch
CLOSED tripped).
.
Check if mounting flange fits the valve/gearbox.
Spigot at flanges should be loose fit!
The output drive types B1, B2, B3, or B4 (figure A-3) are delivered with bore
and keyway (usually according to ISO 5210).
For output drive type A (figure B-1), the internal thread of the stem nut must
match the thread of the valve stem. If not ordered explicitly with thread, the
stem nut is unbored or with pilot bore when delivered. For finish machining
of stem nut, refer to next page.
.
Check whether bore and keyway match the input shaft of valve/gearbox.
.
Thoroughly degrease mounting faces at multi-turn actuator and
valve/gearbox.
.
Apply a small quantity of grease to input shaft of valve/gearbox.
.
Place actuator on valve/gearbox and fasten. Fasten bolts (quality min. 8.8,
refer to table 2) evenly crosswise.
8
Multi-turn actuators SAN 07.1 – SAN 25.1/SARN 07.1 – SARN 25.1
for valve automation in nuclear power plants
Operation instructions
Figure A-3
Output drive type B1/B2
Plug sleeve
Output drive type B3/B4
Bore with keyway
Strength class 8.8
T
A
(Nm)
M 8
25
M 10
50
M 12
87
M 16
220
M 20
420
Table 2: Fastening torque for bolts
