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Flowmeter

  • US 4,362,052 A
  • Filed: 04/30/1981
  • Issued: 12/07/1982
  • Est. Priority Date: 05/16/1980
  • Status: Expired due to Term
First Claim
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1. A flowmeter comprising a chamber-defining part and a displaceable member which is moveable in relation to said chamber-defining part between two ends of travel to change the size of the chamber, means defining an inlet fluid-flow path which leads to said chamber and an outlet fluid-flow path of the flowmeter, flow-control means arranged in said fluid-flow path defining means to control the flow of fluid selectively through the said inlet fluid-flow path to move said displaceable member or from said inlet fluid-flow path to said outlet fluid-flow path without moving said displaceable member, measuring means arranged to measure the distance through which said displaceable member moves, flying start means connected to the measuring means to cause the latter to commence measurement at a time after said flow-control means have been switched to cause fluid to flow through said inlet fluid-flow path to move said displaceable member away from one of said ends of travel, terminating means arranged to cause the measurement to be terminated before said displaceable member reaches its other end of travel, whereby the measurement is completed during a single stroke of said displaceable member, and return means arranged to return said displaceable member to its starting end of travel before each succeeding measurement by said measuring means, whereby all measurements are made with said displaceable member travelling in the same direction.

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