Importance

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Abstract

A device for sensing fluid flow comprises a housing having an inlet and an outlet and defining a fluid flow channel between the inlet and the outlet, a first member disposed in the fluid flow channel and including at least one rigid portion, and a second member disposed in the fluid flow channel upstream from the first member and including at least one flexible portion, the flexible portion being elastically flexible between an initial position spaced from the rigid portion and defining a first effective flow area and a final position adjacent the rigid portion and defining a second effective flow area which exceeds the first effective flow area. The device includes pressure passages including a linking arrangement for conveying pressures to a pressure transducer from upstream and downstream of the second member, the pressure measurements being correlated to a fluid flow rate. The link arrangement protects the transducer from pressure surges. The pressure transducer may be disposed in the housing.

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First Claim