METHOD OF MANUFACTURE OF BALL COCK Russian patent published in 2004 - IPC

FIELD: pipe line fittings; manufacture of ball cocks for pipe lines handling fluid media. SUBSTANCE: proposed method includes preparation of two halves of cock body for forming cock body and ball having through passage. Opposite open ends of ball are flat in shape. Both halves of body are symmetrical bodies of mirror image. Ball is provided with two recesses. Circular seats of cock are fitted in both halves of body. Each seat forms seal between outer surface of ball and inner surface of cock body. Both halves of cock body are coupled by their open ends which are opposite to hole, thus embracing the ball. On other side, ball is held in such position that it is turned through angle of 90 deg. from normal working position of cock. Central line of through passage lies in one straight line with working axis of ball and intersects perpendicularly straight line running centers of two holes and center of ball. Then, open ends of two halves of body are welded together and holes are made by machining with no change in ball position for mounting two rod units in areas of body which are directed to both flat open ends of through passage of ball so that centers of holes lie on working central line of ball cock. Then, ball is turned through angle of 90 deg. to normal working position of cock so that through passage is positioned on level of both holes of cock. Recesses of ball are located at level of both holes of body. Then, two rod units are secured in both holes and rods are inserted in both recesses after which rod units are welded to edges of holes over circumference. EFFECT: reduced number of components of ball cock; reduced usage of materials; avoidance of harmful effect thermal deformation due to welding; enhanced precision. 8 cl, 5 dwg