| 摘要 |
<p>A four-way valve (12) includes a valve housing (14) having a valve chamber (30) inside; connection openings (62, 64, 66) opening in the inner surface of the valve chamber (30); a slide valve element (24) for controling communication between the connection openings (62, 64, 66) according to a sliding position thereof; and a drive mechanism for driving the slide valve element (24),the drive mechanism having a sleeve (80) defining a cylinder bore (86) inside; a piston (78) slidably fitted in the cylinder bore (86); a valve rod (76) attached with the slide valve element (24); a pilot pressure chamber (88) supplied with pilot pressure for sliding the piston (78); and an O-ring (94) supporting the sleeve (80) inside the valve housing (14), the O-ring (94) securing a gap (98) between the outer circumferential surface of the sleeve (80) and the inner circumferential surface of the valve housing (14).</p> |
