PIPELINE FITTING Russian patent published in 2009 - IPC F16K27/04 

FIELD: transportation.

SUBSTANCE: pipeline fitting comprises body in which axial flowing channel with tapering inlet segment and expanding outlet segment is made. At least one seat with orifice is installed between the sections. Flow section area of the orifice is equal to minimum flow section area of the channel. Surface of at least one of the channel segments is made as mating by their barreled and concave relative to channel axis surfaces. Generatrices of these surfaces represent segments of circles. Circular arc of barreled surface passes tangent to horizontal generatix of pipeline orifice or orifice of channel segment with maximum area of flow section. Circular arc of concave surface passes tangent to horizontal generatix of seat orifice or orifice of channel segment with minimum area of flow section.

EFFECT: lowering of hydraulic resistance in the mode when channel flow section is passable for working fluid.

4 cl, 5 dwg