A valve that has the handwheel and stem rise together when turned is known as what?

The valve described is identified as a Rising Stem Valve because in this type of valve, when the handwheel is turned, both the handwheel and the valve stem move upward simultaneously. This movement is characteristic of certain types of valves, such as gate valves, where the stem's rise indicates the open position of the valve.

Rising stem valves provide a clear visual indication of the valve's position: when the stem is fully raised, the valve is open; when it is fully lowered, the valve is closed. This feature makes them easier to operate and monitor, which is essential in various applications where precise control of flow is necessary.

Understanding this mechanism is crucial in power engineering, where maintaining the correct operation and safety of system components is vital. This design contrasts with other valve types where the stem does not rise, leading to different operational characteristics.