| 摘要 |
<p>A low flow, constant rate pump is provided which comprises a fixed volume container (10), the inner walls (12) of said container defining a receptacle for a liquid to be dispensed, said container (10) being provided with means (16) to form an unobstructed opening (18) through which said liquid may be caused to flow continuously at a low-flow, contant rate, a propellant chamber (19) within said container (10) formed of a material which is permeable to vapor from a propellant (20) of the liquid-vapor type, a supply of propellant (20) of the liquid-vapor type confined within said chamber, said propellant initially being under pressure sufficient to maintain a major portion thereof in liquid form at normal temperatures.</p> |
