SOMAS A11 - Adjustment of the End Positions; Tightening Torque, Tie-Rods and Nuts

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Edition: 2022-06 Original document - Mi-503 EN
1
3
2
4
3
Standard
NM
4.4 Adjustment of the end positions
Danger!
Risk of injury! Do not place hands and fingers in the area of moving parts of the valve or of the
actuator when the actuator is connected to the compressed air supply. Single action actuators
may move to “open” or “closed” position without being connected to the air system.
1 End position bolt “open” position 2 End position bolt “closed” position 3 Locking nut 4 Type plate
Fig.4-6 End position bolts on pneumatic actuator
Types A-DA A11, A21 and s.o. has one cylinder.
Types A-DA A22, A32 and s.o. has two cylinders.
The movement of the actuator is limited through end position bolts. The final position
for the open or closed setting can be adjusted with the end position bolts.
In closed position, the adjustment screw allows for adjustment of ± 5 degree.
The end position bolt on the open position, functions as a limit of the valve stroke of the
piston. The stroke of the piston depends on the function of the valve.
Attention!
Damage to PTFE seats!
While adjusting butterfly valves equipped with PTFE seats keep attention not to close the valve
to firm. This causes damage to the seat!
M8 10
M12 30
M16 50
M24 75
Tab.4-1 Tightening torque, tie-rods and nuts
Thread Max. torque (Nm)
4.4.1 Tightening torque, tie-rods and nuts
The table below shows the maximum permitted tightening torques for tightening
tie-rods and nuts when the actuator has been dismantled (
➔ Tab.4-1).