| 摘要 |
A drain valve allows liquid to flow into or out of a liquid-container product by use of a restriction cap having a control ring that twists in and out of a base ring in order to control the flow. The restriction cap has a flow valve, having a top, apertures, and a base, and a control ring, having a top, base, center aperture, and protrusions. The control ring is sealed against the flow valve top by an O-ring when the drain valve is closed and is also sealed against the side of the flow valve. As the control ring is twisted into the base ring, control ring protrusions twist within channels inside the base ring and a piston valve is depressed, allowing liquid to flow. As the control ring is twisted out of the base ring, the control ring base blocks the flow apertures, preventing liquid from flowing.
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