| 摘要 |
<p>A fluid delivery system which comprises a variable volume reservoir into which fluid is drawn through a valve means and pressurised and from which fluid is forced out through a second valve means to be discharged through an outlet nozzle. In an embodiment the reservoir (24) is formed between lower and upper rolling diaphragms (20, 22), and a rotary cap (18) is operable to move the first diaphragm up and down, in the former case to depressurise the reservoir and cause fluid to be drawn into the reservoir through a valve (52, 54) associated with the lower diaphragm, and in the latter case to pressurise the drawn in fluid, so that a manually operable valve (58, 64) associated with the upper diaphragm can be operated fully to discharge the pressurised fluid through an outlet nozzle (27) due to the action of a spring (53) acting on the lower diaphragm.</p> |
