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The differences between the rising stem and the descending stem types of gate valves
••The stem is exposed and equipped with a yoke.
••The stem and handwheel engage via threads to drive the gate vertically up and down. The open/closed status can be directly observed.
••The stem is hidden, and there is no external yoke.
••The threaded end of the stem is fixed to the gate. When rotated, it moves the gate up or down while the stem itself only rotates.
••The degree of opening/closing is visually intuitive, and maintenance is easier. However, the exposed stem is prone to corrosion and requires more installation space.
••The stem is protected, offering better corrosion resistance. However, an indicator is needed to determine the valve status, and maintenance is more challenging.
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