In what position must the stem of an operational split wedge gate valve be?

The stem of an operational split wedge gate valve must be in a vertical position. This orientation is crucial for several reasons:

Firstly, a vertical stem allows for the proper alignment of the gate within the valve body, ensuring that the gate can open and close smoothly. When the valve operates, the gate moves perpendicular to the flow, and a vertical stem supports this motion effectively.

Secondly, a vertical position helps in preventing any undesired wear or stress on the stem and sealing surfaces of the valve. If the stem is misaligned due to being in an incorrect position, it can lead to issues such as leaking or difficulty in operation over time.

Additionally, maintaining a vertical orientation helps in properly utilizing the natural gravitational weight of the gate, ensuring that it sits correctly within the valve body when closed, providing a tight seal against the flow.

In summary, having the stem in a vertical position is essential for the functional integrity, efficiency, and longevity of a split wedge gate valve.