Wetmaster Co., Ltd.

Shigehito Yamada

Masakazu Saito

Yoshijiro Shiba

A restriction flowmeter including a cylinder through whose interior a fluid to be measured flows and a pipe for forming a restriction structure penetrating the cylinder in a direction perpendicular to the central axis of the cylinder, the pipe having a diameter smaller than the inner diameter of the cylinder, characterized in that a first pressure measuring hole is formed on the most restricted cross section perpendicular to the flow direction and a second pressure measuring hole is formed on a wall of the cylinder located upstream which is away from the most restricted cross section by &#xbd; or more of the inner diameter of the cylinder.

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Tokyo, Japan

Shigehito Yamada