HINGE JOINT FOR PIPE LINES Russian patent published in 1999 - IPC

FIELD: swivel joints of pipe lines. SUBSTANCE: body is made in form of tube with hinges of articulated parts (gates, panel, etc.) located on it. Pipe lines are laid inside body; at one end they are rigidly connected with one of engageable parts and at other end they are rigidly connected with other engageable part; they are oriented and supported inside body by means of cages. When engageable parts are turned through definite angle in opposite sides, pipe lines are twisted through the same angle. Turn of engageable parts continues within elasticity limits of material of pipe lines keeping them intact. EFFECT: high tightness of joint, corrosion resistance, chemical resistance to working media; enhanced reliability of joint. 3 cl, 2 dwg