HLA
– Double acting- hydraulic linear actuator
Use and maintenance manual
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Pag. 19
Contents may change without notice
3.4
CALIBRATION OF THE ANGULAR STROKE
It is important that the mechanical stops of the actuator (and not
those of the valve) stop the linear stroke at both extreme valve
position (fully open and fully closed), except when this is required by
the valve operation).
The setting of the open/closed valve position (upward position)is
performed by adjusting the travel stop screw into the end flange of
the hydraulic cylinder and by the adjustment of the coupling of valve
stem to actuator joint for the downward position.
Picture 5
– Mechanical stop
For the adjustment of the mechanical stop on the end flange of
cylinder, follow these steps (Figure 6):
❑
Remove with the specific wrench (c1) the plug (t).
❑
Insert a wrench for Allen keys (c2) in the through hole until
reaching the adjustment pin (g).
❑
Keep the protection cover blocked with the special wrench (c3).
❑
If the actuator angular stroke is stopped before reaching the
upward position (fully open or closed), unscrew the adjusting
screw by turning it anticlockwise with a proper wrench , until the
valve reaches the right position
❑
If the actuator angular stroke is stopped beyond the upward
position (fully open or closed valve), screw the stop screw by
turning it clockwise until the valve reaches the right position.
❑
When the adjustment is over tighten the plug (t).
