HYDRAULIC SYSTEM OF STAND FOR TESTING STRENGTH OF PIPELINE VALVES AND FITTINGS Russian patent published in 2004 - IPC

FIELD: pipeline testing facilities. SUBSTANCE: proposed hydraulic system contains electric motor, pump, pressure and drain main lines connected with clamping hydraulic cylinder and valve flange pressing hydraulic cylinders through first and second working fluid distributors, adjustable safety valve between pressure and drain main lines, check valves at inlet of first and second hydraulic distributors, pressure recorders, tank and filter. Third and fourth hydraulic distributors are introduced into system, being hydraulically connected with control hydraulic cylinder, first and second hydraulic distributors. Control hydraulic cylinder is mechanically connected with water feed hydraulic cylinder whose piston space is connected through check valves and valves with test fluid (water) source and with inlet of fitting, and adjustable safety valve between second pressure and drain main lines and valve between pressure main lines. EFFECT: increased labor productivity. 1 dwg