| 摘要 |
According to one embodiment, in a method of controlling a valve, a valve body is moved by a first distance toward an open position at a start of the operation, the first distance being longer than a distance corresponding to maximal compression of a sealing member, and then, moved in a closing direction as far as a fully closed position where the sealing member is depressed by the valve body to be maximally compressed, and setting the fully closed position as an initialized position. The valve body is moved with the initialized position as a reference, to a normal closed position by a second distance in the opening direction, the second distance being shorter than the distance corresponding to maximal compression, or to a normal open position by a third distance in the opening direction to open the passage, the third distance being longer than the first distance.
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