Patent ID: 6581904
Filing Date: 2003-06-24
Classification: F16K

Abstract:
A solenoid valve comprising:(a) an electromagnetic drive unit for generating a magnetomotive force when being fed with electric power; (b) a member having a controlled-fluid passage and an accommodation chamber containing the electromagnetic drive unit; (c) a partition wall defining a part of the controlled-fluid passage; (d) a valve opening extending through the partition wall; (e) a shaft extending through the valve opening and being driven by the electromagnetic drive unit; (f) a valve member fixed to the shaft and moving into and out of contact with the partition wall to block and unblock the valve opening in accordance with movement of the shaft; and (g) a thin-film sealing member connected to the shaft for motion in response to the movement of the shaft and made of rubber-based resilient material for airtightly separating the controlled-fluid passage and the accommodation chamber from each other, the thin-film sealing member having a first portion, a second portion and a third portion, the second portion extending around the first portion and the first portion extending around the third portion which is engaged with and contacts the shaft, the first portion being less resiliently deformable than the second portion, the first portion being coupled to the shaft via the third portion for motion in response to the movement of the shaft, and the second portion deforming in response to the motion of the first portion.