CONTROL BALL VALVE Russian patent published in 1997 - IPC

FIELD: manufacture of fittings, in particular pipeline valving. SUBSTANCE: control ball valve has housing with coaxially positioned inlet and outlet branch pipes. Installed in the housing is ball gate with openings on its opposite sides, which come in contact with perforated discs made of antifriction material, for example of bronze. The discs are rotatably installed in recesses of the branch pipes. Holes with identical diameters on the ball and perforated disks are disposed along concentric circumferences at equal distances from the central holes. The further are the holes from the center, the smaller are their diameters. All the holes are made radial, it means that they are directed toward the center of the ball. EFFECT: improved effectiveness of flow control. 2 cl, 4 dwg