| 摘要 |
Valve means comprising at least three connections (1-4) intended to serve as inlets (1 and 3) and/or outlets (2 and 4). Said connections are provided in communication with a channel system (5) which is formed of flexible walls (6 and 7) and which is externally compressible to provide an optional communication between selected connections. The channel system (5) may be formed by suitable welding or gluing of said flat sheets (6 and 7), whereby the connections (1-4) are preferably constituted by tube nipples which are welded or glued between said flat sheets. Preferably said channel system (5) is in the form of an essentially endless annular loop with said connections being provided in pairs diametrically opposed to each other. |
