| 摘要 |
PROBLEM TO BE SOLVED: To provide a control valve capable of gradually varying flow rate of fluid flowing in one pipe and reducing a rotation area of a valve element where a communication hole opens by half than the conventional art. SOLUTION: In the control valve 60, one of a full opening section 30, a full closing section 28, and a partially blocked section 29 disposed in the valve element 20 is overlapped on a pair of communication holes 31 and 31 disposed in a casing 10, which gradually varies the flow rate of the fluid flowing in one pipe 26 for discharge. A conventional communication hole 5 disposed in one pipe is formed of the pair of communication holes 31 and 31. Therefore, when total opening area of the communication holes 31 and 31 is set equal to that of the conventional communication hole 5, the individual communication hole 31 is smaller than the conventional communication hole 5, and switching between a opening state and a closing state can be more rapid than the conventional art. COPYRIGHT: (C)2004,JPO&NCIPI
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