| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve device capable of reducing " fluid reaction (valve closing force) " acting on a ball valve in a microscopic valve opening range, without reducing a dimension in the radial direction of a tapered slide. SOLUTION: This valve device has a plurality of recessed parts 34 in the peripheral direction of the tapered slide 31, and reduces a rate of a microscopic clearance formed between the ball valve 4 and the tapered slide 31 even in the microscopic valve opening range". The fluid reaction " acting on the ball valve 4 reduces by reducing the rate of the microscopic clearance, and valve opening force in the microscopic valve opening range can be reduced. Since "the fluid reaction" can be reduced by arranging the recessed parts 34, there is no need to reduce the dimension in the radial direction of the tapered slide 31. Thus, when closing the valve, the ball valve 4 can be surely guided to a seating seat 32 by the tapered slide 31, and a distance between the seating seat 32 and a port side edge part 33 can be secured, and valve leakage can be prevented even if abrasion and deformation are caused in the port side edge part 33. COPYRIGHT: (C)2008,JPO&INPIT
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