Abstract: This invention provides a fluid flow meter including an elongated tube and an element adapted for connection to a fluid line, the elongated tube including one or more orifice openings of predetermined area, and indicia correlated with the area of the orifice opening for providing a reading of fluid flow dependent upon the level to which fluid rises in the elongated tube.In one embodiment the tube includes a plurality of scales for indicating different ranges of flow rates, and an orifice opening corresponding to each of said scales, said orifice openings being of different areas and selectively openable so that said scales can individually be made to show fluid flow rates.

Abstract: This invention provides a valve consisting of a body and rotatable valve member, both of which are made of plastic, the valve body having a passageway intersected by a frustoconical opening which receives the valve member. The valve member is rotatable for controlling the flow through the passageway, the rotation being accomplished by engaging a recess in the outer end of the valve member. The body includes an outwardly deflectable shoulder that fits over the outer end of the valve member to hold the valve member in the body. The valve member is made to a greater major diameter than that of the opening in the valve body to provide an interference fit. Deep annular grooves around the valve opening provide a thin wall for the valve body around the opening, allowing distortion-free molding of the valve body.