| 摘要 |
PCT No. PCT/GB92/01387 Sec. 371 Date Jan. 24, 1994 Sec. 102(e) Date Jan. 24, 1994 PCT Filed Jul. 21, 1992 PCT Pub. No. WO93/03280 PCT Pub. Date Feb. 18, 1993.A pump comprises a flexible diaphragm (10) separating a pumping chamber (12) for the fluid to be pumped from a driving chamber (14) for a pressure fluid operating the pump. An outlet (24) for the pressure fluid from the driving chamber is controlled by a valve element (28) that is molded integrally with the diaphragm and with a tension element (36) that draws the valve element to its closing position. Deflection of the diaphragm by the pressure fluid pumps fluid from the pumping chamber and as the deflection increases the valved outlet of the driving chamber is opened against the force of the tension element. Release of the pressure in the driving chamber allows the valve to close again and the tension element ensures that it returns to a position sealing the driving chamber outlet.
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