| 摘要 |
<p>There is provided a proportioning system for mixture of the fluid to a liquid-carrying main line in a substantially constant, presettable proportion to the flow rate of the liquid in the main line. The system comprises pump means for drawing a quantity of fluid from a vessel and for injecting the quantity into the main line, pump-drive means impactable by the main-line liquid for driving the pump means, flowmeter means for monitoring the instantaneous flow rate of the main line and converting the flow rate into a flow-rate proportional rotary motion of an output member of a flowmeter means. The system further comprises pilot-valve means for converting rotary motion into trains of substantially square-wave-like liquid pressure pulses of a frequency dependent on the flow-rate proportional rotary motion, and control-valve means, acted upon via the pilot-valve means by the liquid-pressure pulses, for alternatingly passing liquid from the main line to the pump-drive means, and permitting return of the liquid from the pump-drive means to the control-valve means.</p> |
