| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a constitution of a liquid tank having a valve structure capable of feeding air into a tank as internal liquid is fed to the external, and inhibiting the liquid from leaking through the valve structure. <P>SOLUTION: The valve structure 9 provided at a feed water tank includes a valve disc 22, a supporting hole 31 which supports this valve disc 22, and a steel ball 28. The valve disc 22 includes an umbrella section 23 which comes in contact with and separates from a valve seat 21 and a stem section 24 which projects from this umbrella section 23. The space 27 for holding the steel ball includes a recess 30. The steel ball 28 does not come in contact with the stem section 24 and the valve disc 22 closes the valve by being brought into contact with the valve seat 21 with hydraulic pressure in the condition of selected figure in which the valve structure 9 is located at the side part of the feed water tank and the valve seat 21 is sunk under the surface of the water vertically. When the valve structure 9 is made to come to the top surface side of the feed water tank by rotating the feed water tank by 90° from the condition in the preferred figure, since the steel ball 28 is fallen into the recess 30 due to the dead load and also tilts and moves the stem section 24, the umbrella section 23 is separated from the valve seat 21, and the valve is opened. <P>COPYRIGHT: (C)2010,JPO&INPIT |
