US Patent 7261125 Valve assembly for liquid containers

A valve assembly for liquid containers includes a base fixed on the water bottle and a connector unit which is connected to the base by a locking member. Each of the base and the connector unit includes a valve piece which is biased by a spring to seal the base and the connector unit respectively. When the connector unit is connected to the base, the two valve pieces push against to each other to compress the two respective springs so as to release the sealing status of both of the base and the connector unit. The connector unit includes a connection portion and a hose can be connected to the connection portion. The user can have the water in the bottle via the hose while the connection portion can be rotated 360 degrees.