In an outside screw and yoke valve, where are the stem threads located?

In an outside screw and yoke valve, the stem threads are positioned externally, allowing for direct accessibility and manipulation from outside the valve body. This design facilitates maintenance and operation since the valve stem can be adjusted or controlled without needing to access internal components, which may be under pressure or require disassembly.

The external positioning of the threads means that the valve can be operated more easily and safely, as it minimizes the risk associated with handling internal parts, particularly when the valve is part of a pressurized system. The visible stem extends outside the valve, ensuring that operators can see whether the valve is open or closed based on the position of the yoke or handwheel. Hence, the correct answer highlights this functional characteristic of the valve's design and operation.