METHOD AND DEVICE TO REDUCE IMBALANCE OF CAVITATION AND DYNAMIC FORCE ON HYDRAULIC VALVE

摘要

PURPOSE: To prevent damage by cavitation and provide certain work by arranging control elements on the inside of a bore by making 4 their respective axes align with each other and arranging a means to balance force working on the control elements under existence of pressure fluid in the inside of the bore. ;CONSTITUTION: A fluid control device 70 makes a valve stem arranged on the inside of a bore 74 formed in a main body, that is, in a valve main body 76, that is, a check 72, and it includes a movable control element to control a flow of pressure fluid passing through a fuel injection spray orifice. Additionally, the valve stem 72 includes two end parts 88, 90 separated by an intermediate part 92 contracted in diameter. Consequently, force working on the valve stem 72 is balanced by making cross-section areas of the both end parts 88, 90 equal to each other. In the meantime, fluid vortically flows and stagnation is removed by inclining an inlet passage 78 relative to a vertical axis of the valve stem 72.;COPYRIGHT: (C)1995,JPO