Installation, Operation and Maintenance Manual
MAN 573 Rev. 8
July 2020
3.4
Calibration of the angular stroke
!
WARNING
It is important that the mechanical stops of the actuator (and not those of the valve) stop the angular
stroke at both extreme valve position (fully open and fully closed), except when this is required by the
valve operation (e.g. metal seated butterfly valves).
The setting of the angular stroke is performed by adjusting the travel stop screws of the cylinder end
flange and of the housing wall.
The setting of the open valve position is performed by adjusting the travel stop screw on the left side
of the actuator (screwed in the housing wall for spring to close actuators or in the cylinder end flange
for spring to open actuators).
The setting of the closed valve position is performed by adjusting the travel stop screw on the right
side of the actuator (screwed in the cylinder end flange for spring to close actuators or in the housing
wall for spring to open actuators).
For the adjustment of the travel stop screws proceed as follows:
(Please refer to Figures on the following page).
1.
Loosen the locknut with wrench C2.
2.
If the actuator angular stroke is stopped before reaching the end position (fully open or
closed), unscrew with wrench C1 the travel stop screw by turning it anticlockwise, until the
valve reaches the right position. When unscrewing the travel stop screw, keep the lock nut
still with a wrench so that the sealing washer does not withdraw together with the travel
stop screw.
3.
Tighten the locknut (refer to torque Table to avoid accidental unscrewing of the locknut).
4.
If the actuator angular stroke is stopped beyond the end position (fully open or closed valve),
screw the stop screw by turning it clockwise until the valve reaches the right position.
5.
Tighten the locknut (refer to torque Table to avoid accidental unscrewing of the locknut).
Table 5.
Actuator Model
Thread
Wrench C2 (mm)
Torque (Nm)
RP 14/15
M30X2
41
150
RP 30
M40X2
50
350
RP 60
M45X2
55
500
RP 120
M50X2
60
800
Operation and Use
17
Section 3: Operation and Use
