| 摘要 |
A pistonless device for metering a quantity of fluid from a source of fluid under pressure to a delivery line at a lesser pressure comprises a valve body defining a fluid flowpath, and including a fluid accumulator in fluid communication with the flowpath. An inlet valve upstream of the accumulator, and an exhaust valve downstream of the accumulator, are operated alternately in such a way that at most one of said valves is open at a time, so that positive metering displacement results.
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