| 摘要 |
PURPOSE:To make size in height smaller but an effective stroke in a piston part grow larger instead, by setting up a valve stopper, regulating a lifting amount of an outer circumferential end of a back leaf valve, in an upper edge part of the outer circumferential side of a valve seat. CONSTITUTION:A back leaf valve 21, whose inner circumferential end is locked, is set up on the top of a valve seat 20 of a valve part 2, and this back leaf valve 21 works to open or close an outer oil passage 20c of the valve seat 20. A valve stopper 22 shaped in an annular body is set up in an upper edge part of the outer circumferential side of the valve seat 20, while a stopper part 22a, regulating a lifting amount of an outer circumferential end of the back leaf valve is installed in the whole part or a part of the inner circumferential side of the valve stopper 22. |
