| 摘要 |
The invention relates to a valve incorporating a flexible diaphragm, and improves upon known diaphragm valves to permit the use of a diaphragm-controlled valve in systems for which such valves were not previously suitable or utilised. There is provided a valve which includes a housing (2, 3, 34) having a hollow interior within an outer housi ng surface (31), a diaphragm (1a, 1b) extending across the interior and creating a diaphragm control chamber (10) within the interior, a valve seat (4) against which a part (la) of the diaphragm can seal, a first conduit (5) leading around at least pan of the valve seat, a second conduit (6) leading to within the valve seat, and a diaphragm control means (8, 9; 91, 92; 101; 111, 112), characterised in that the diaphragm control chamber is isolated from the first and second conduits. A valve unit and a flow control system are also disclosed, utilisi ng one or more valves as herein described.
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