A single acting cylinder can be controlled by which type of valve?

A single acting cylinder requires a valve that can control the flow of fluid in and out of the cylinder to facilitate its movement in one direction while allowing return motion through other means, typically a spring or gravity. The appropriate choice is a three-way, two-position valve.

This type of valve has three ports: one for the supply of fluid, one for the exhaust, and one connected to the single acting cylinder. When the valve is activated, it allows fluid to enter the cylinder, extending it. In the alternate position, the valve exhausts the fluid from the cylinder, allowing it to return to its original position. This setup accurately captures the operation of a single acting cylinder, where motion is controlled by a single supply line and a spring or gravity aids in the return.

The other options do not suitably match the requirements for controlling a single acting cylinder. A two-way valve either directs fluid into or out of a cylinder but cannot manage both actions effectively for the functional needs of a single acting cylinder. A two-position, three-way valve is unnecessary for this application, as it does not align with the functional demands of controlling a single acting cylinder's operation. Therefore, the three-way, two-position valve is the most effective choice.