| http://www.w3.org/ns/prov#value | - a bent piece, preferably shaped like ???<???, and capable of pressing the valve body in a closed direction, wherein the valve body is placed at such a position as to close an opening of the atmospheric communication hole, the elastic member is developed and positioned in the atmospheric open chamber, and in the positioned state, the elastic member presses at one end part the valve body in the clo
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