What type of valve typically features a design where the stem moves alongside the handwheel?

The design of a valve where the stem moves alongside the handwheel is characteristic of a rising stem valve. In this type of valve, the stem is directly attached to the handwheel, and as the handwheel is turned, the stem rises or falls accordingly, which allows for precise control of the valve's opening and closing action. This motion is particularly beneficial in applications where visual indication of valve position is important, as the rising stem provides a clear view of how far the valve is opened.

Rising stem valves are often used in applications requiring frequent operation and can be found in various forms, including gate valves and some types of globe valves. Their design enhances the operator's ability to monitor valve status and helps ensure that the operation is smooth. This mechanism is distinct from other valve types, where the stem may not rise visibly or may operate with a different action altogether.