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DCV ACTUATION METHOD
Directional valves’ actuator can be shifted to their positions by
manual, mechanical, electrical, or pneumatic actuators, Figure 11.1.
When directional valves is be controlled at an operator’s discretion,
his or her muscle power is used on a manual actuator. Mechanical
actuation is chosen when the shifting of a directional valve must occur
at the time a cylinder physically reaches a specific position.
Figure 11.1: Schematics of common valve actuators
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