SWIVEL CHECK VALVE Russian patent published in 2004 - IPC

FIELD: pipe line fittings; compressor stations of gas lines. SUBSTANCE: proposed swivel check valve has body, swivel plate secured on valve shaft and turnable between open and shut-off positions relative to straight-way passage and hydraulic swivel damper. Damper body is provided with two fixed separating partitions and shaft with two rotating blades secured on it. Working chambers of damper formed by separating partitions and rotating blades are filled with damping fluid. Working chambers of damper are communicated through slotted clearances inside damper and through throttling unit which controls time of closing (opening) of swivel plate. Damper shaft is connected with valve shaft which is mounted in outlet chamber of valve. Damper is provided with additional reservoir whose lower point is located above upper generatrix of internal diameter of damper body and is communicated with both working chambers of damper through calibrated orifice. Upper point of additional reservoir is connected with outlet chamber of valve by means of pipe line. Three-way valve is fitted in its straight-way passage. EFFECT: enhanced reliability; increased service life of check valves. 2 dwg