SINGLE BOX TYPE TANGENTIAL FLOW IMPELLER TYPE METERING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a metering device capable of facilitating instrumental error adjustment by reducing plus tendency of the instrumental error at a peak basin. SOLUTION: An upper space is provided over a blade rotation space where blades 18a of an impeller in an impeller chamber are rotated. A rectangular resistance plate 40 for suppressing the flow of incoming service water from an incoming side nozzle 11a is provided in the upper space. The resistance plate is made protrusively downward from the outer bottom face 21a by integral molding with a register box, provided with an arc-shaped aperture 41, and formed in the direction perpendicular to the jet direction b from the incoming side nozzle. A semicircular adjusting plate 42 is provided rotatably around a sealing screw 43 mounted on the aperture center on one inflow side face of the resistance plate. The aperture has an adjustable aperture area, and is fixed by tightening the sealing screw 43 after adjustment. COPYRIGHT: (C)2004,JPO