What occurs when a rising stem gate valve is opened?

When a rising stem gate valve is opened, both the gate and the stem move upward. This type of valve is designed so that as the valve is turned, the stem ascends, pulling the gate upward out of the flow path. This design allows for a clear visual confirmation of whether the valve is open (with the stem visibly protruding) or closed (with the stem retracted into the valve body).

The upward movement of both the gate and the stem is essential to ensure proper operation and sealing of the valve, allowing for smooth fluid flow once fully opened. The construction of the valve ensures that the gate is pushed upward into a pocket above the fluid flow, preventing any obstruction and allowing for minimal resistance in the open position. This feature is crucial in applications that require the valve to be fully open or closed, as the movement of the stem and gate being in unison helps to maintain the integrity of the valve design and function.