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Hygienic butterfly valves model F250 & F251
Appendix D - Actuator F257
Mounting parts
Ref. No. Qty. Description
18
1
Drive boss
19
2
Bridge clamp
20
2
Screw
21
2
Spring washer
Actuator mounting
A
- When installing a double acting or spring to close actuator, put the valve in the closed
position. When installing a spring to open actuator, put the valve in the open position. The
bottom of the disc stem is marked to indicate open or closed position.
B
- Remove handle if fitted, see 6.5
C
- Fit drive boss 18 onto the valve stem square so that the actuator will be correctly orientated.
D
- Position the actuator onto the valve/drive boss.
E
- Introduce the two bridge clamps 19 and move the actuator until all the locating pins engage
in their respective holes in the actuator base and valve.
F
- While holding the bridge clamps 19 together with one hand, screw in the two screws 20 with
spring washers 21 finger tight.
G
- Torque up the two screws 20 according to torque values table:
Valve size
Torque (Nm)
25 – 65
14
80 – 100
18
125
22
H
- Cycle test actuator to ensure correct operation.
Pentair reserves the right to change the contents without notice
18
19
20
21
Material
W. Nr. 1.4301
W. Nr. 1.4301
A2
A2
page 7
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