Float type fluid flow meter - has widened section at top of tapering float tube allowing rapid fluid flow outside normal range of measurement

摘要

The flowmeter comprises a hollow tube (1) with a float (2) mounted so that it may slide vertically along a guide rail (3) lying along the tube axis. The tube has a lower cylindrical part (4), an intermediate part (5) tapering towards the top, and an upper cylindrical part (6). Fluid flows upwards so that the float adopts a position in the tapering section dependent on the rate of flow. At the top of the tapering section of the tube there is a bulge considerably increasing the tube dia. If an exceptionally large flow occurs, then the float rises to a stop (10) which holds it in the bulge to provide min. impendance to the flow. The meter is useful for monitoring the air supply to pulsed air burners, where a controlled flow is normally required, but a rapid flow of air is required for accelerated cooling.