| 摘要 |
A key member has an engaging portion, which is engaged with an annular groove formed in a valve plunger to prevent the valve plunger from coming off from a valve body. On the rear side of the key member, the valve body has a guide portion which is adapted to slidably guide the valve plunger. Axial passages are formed around the guide portion which form a variable pressure passage together with a radial passage. The key member is inserted in the radial passage in such a manner that its rear end face abuts against the end face of the guide portion. The distance between the engaging region of the key member and the valve plunger and the abutting portion of the key member and the valve body is decreased, so that the bending moment applied to the key member is decreased. This feature makes it possible to decrease the thickness of the key member and accordingly the weight of the latter.
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