| 摘要 |
<p>The invention comprises a rotary valve (1) having first and second inlet/outlet flow passages (3a,3b), as well as one or more (preferably between 6 and 8) flow ports (C-J). The valve has a plurality of positions simultaneously interconnecting the first and second flow passage (3a,3b) to selected flow ports (C-J). In a preferred embodiment, the valve has a housing (2) and the flow ports (C-J) are disposed on outer peripheral walls of the housing (2). The valve may further include an internal rotary plug (4) that is rotatable about a longitudinal axis to move between the positions, and containing openings (13a,13b) to connect the flow passages (3a,3b) to the flow ports (C-J). The plug may be divided into two chambers (4a,4b) in the valve which may or may not be moved independently of each other. The valve may further include a movable seal (14) between the housing (2) and the internal plug member (4) which is retractable to permit freer movement of the plug (4). <IMAGE></p> |
