| 摘要 |
PURPOSE:To substantially reduce selecting force of a slide valve, by providing a slider, which constitutes a tunnel-shaped flow path, to be arranged between valve seats and moving the slider in the axial direction of a cylinder. CONSTITUTION:A slider 28, which constitutes a tunnel-shaped flow path housing a pair of slide valves 24, 25 urged by a leaf spring 29 to valve seats 19, 20, is provided to be arranged between the valve seats 19, 20. While moving the slider 28 in the axial direction of a cylinder 16, the second communication port 19b or the third or fourth communication ports 20b, 20c are selectively switched. By this constitution, the slide valves 24, 25, decreasing their pressure receiving surface, enable the selecting force to be small reduced.
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