The 3-port DCV is utilized when the actuator needs to be powered in how many directions?

The correct answer is that the 3-port directional control valve (DCV) is utilized when the actuator needs to be powered in one direction. This type of valve typically has one inlet and two outlets, which allows for the actuation of a single-acting cylinder. In this setup, the valve can direct the flow of compressed air into the actuator to move it in one direction, while the return force (often from a spring) brings the actuator back to its original position.

In contrast, actuators that require movement in two directions would typically use a 5-port DCV, which can route air to drive the actuator in both directions, allowing for full extension and retraction. Therefore, the design and function of the 3-port valve specifically support operation in just one direction, making it essential for applications where only one-way actuation is necessary.