Non-Rising Stem Manual gate valve
Non-rising gate valves take up little space, rising gate valves require more space. The non-rising construction is designed so that the gate valve stem is fully open when the handle is rotated as far to the left as possible and fully closed when the handle is rotated as far to the right as possible.
In both cases, the handle is flush with the pipe because the mechanism inside the pipe opens and closes the valve without rising the stem.
Another advantage of the non-rising stem gate valve is that it is easier to padlock. Non-rising stem gate valves are typically used only for clean liquids and gases.
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