| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve gear having high sealing performance even for fluid containing foreign matter. SOLUTION: In this valve gear 1 having a valve box 2 provided with a valve box port 2c being a fluid passage and a valve element 3 for opening and closing the valve box port 2c by vertical travel through a valve stem 4 by operating a handle 5, an auxiliary valve seat 8 provided in the valve box 2 is energized to the valve element 3 by a spring 9 to let the valve element 3, the auxiliary valve seat 8, and a valve seat 7 contact closely. COPYRIGHT: (C)2006,JPO&NCIPI
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