Method for verifying a flowmeter and device for the implementation thereof

A method for verification of a flowmeter using a bidirectional prover, the method comprising comparing liquid quantity according to data measured by the flowmeter, with a quantity of liquid flowing through a calibrated section of the prover while a ball piston of the prover is passing through the calibrated section which is taken as a certificated unit of volume,

• wherein the ball piston is configured to accomplish multiple movements in two, opposing directions, with a flow of a verification liquid through a measuring pipe of the prover, sequentially connected to a measuring line, in which the flowmeter is installed,
• wherein a measuring pipeline of the prover comprises an acceleration section (prerun) that is required to increase the ball piston velocity to equate to the speed of free liquid flow, and a calibrated section between its start cross-section and its end cross-section for both directions of the ball piston's movements,
• wherein detectors detect intersection of the start cross-section and the end cross-section of the calibrated section by the ball piston movement during running of the ball piston in a first, current direction and intersection of the start cross-section and end cross-section of the calibrated section during running of the ball piston in a second, reverse direction,
• wherein the tube section, being an acceleration section (prerun) for reverse movement, is used as an additional calibrated section or as an additional part of the calibrated section for current direction, and the tube section, being an acceleration section (prerun) for direct movement, is used as the additional calibrated section or as an additional part for the calibrated section for reverse direction.