| 摘要 |
<p>Apparatus for introducing an additive into a stream of liquid comprises a pipeline which conveys the liquid at a variable rate of flow, a flowmeter whose chamber communicates with the pipeline and accommodates a rotor rotated by liquid in the pipeline at a speed which is a function of the rate of liquid flow to thereby produce signals at a frequency which is indicative of such speed, and a pump which discharges into the chamber a unit quantity of additive in response to each signal whereby the additive is mixed with liquid in the chamber before it enters the main stream of liquid in the pipeline.</p> |
