| 摘要 |
<p>PCT No. PCT/GB91/01570 Sec. 371 Date Mar. 1, 1993 Sec. 102(e) Date Mar. 1, 1993 PCT Filed Sep. 13, 1991 PCT Pub. No. WO92/04986 PCT Pub. Date Apr. 2, 1992.A liquid delivery apparatus including a reservoir into which liquid may be introduced to pressurize the reservoir, an outlet for discharging liquid under the pressure in the reservoir, a valve to control passage of liquid from the reservoir to the outlet, a control mechanism controlling operation of the valve, and a way to transmit the pressure in the reservoir to the valve control mechanism. The valve includes an opening, a closure member for closing the opening, and a biasing spring, the arrangement of which being such that the valve is normally held closed under the force of the biasing spring and the pressure of the liquid in the reservoir. The valve control mechanism includes a movable element which is acted on by the pressure in the reservoir and transmits a resultant force to the closure member in a direction to open the valve, wherein the respective effective surface areas of the movable element and the closure member and the force of the biasing spring are chosen such that the closure member is opened when the pressure of the liquid in the reservoir reaches a predetermined level.</p> |
