| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve, capable of achieving higher seal performance in a valve closed state than conventional devices, and a method for manufacturing a valve, capable of more efficiently manufacturing the valve than conventional methods. SOLUTION: A ball 17 is composed of ceramic, so that sphericity can be set higher than in conventional balls of steel. The ball 17 is thus stably applied to a valve seat 15 tightly, and seal performance in the valve closed state is improved. In the method for manufacturing the valve, the ball 17 used for forming a ball contact surface 15B in the valve seat 15 is also used for the ball 17 as a valve element for opening/closing a valve port 13. The valve 10 can thus be more efficiently manufactured compared with conventional manufacturing methods in which different balls are used for respective purposes. COPYRIGHT: (C)2006,JPO&NCIPI
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