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Manual 5020, rev.03 07/2021 - SC/VHS 15
7.2 Stroke adjustment (when optional travel stops are provided)
It is assumed that the following instructions are executed in the
workshop using oil as the power fluid.
Instructions are applicable when the actuator is already installed on
the valve.
It is important that the travel stops of the actuator (and not those of the valve) stop the linear stroke
at upper end of valve position, 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.
For the adjustment of the travel stop screw in the end flange of the hydraulic cylinder proceed as
follows (Fig.5):
- Loosen the plug (3.4) from the travel stop protection (3.2) keeping the latter locked with a proper
wrench key.
- Adjust the valve stroke screw/unscrew the travel stop screw (3.1)
- After detected the right position, tight the travel stop protection (3.2) against the cylinder end
flange keeping the stopper screw (3.1) locked Screw the plug (3.4) into the travel stop protection
(3.2).
Fig. 5 – Stroke adjustment
After stroke adjustment, operate the actuator with hydraulic supply to
check that the actuator moves properly and that there are no leakages
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