STOP VALVE Russian patent published in 2009 - IPC F16K1/12 F16K31/52 

FIELD: machine building.

SUBSTANCE: present invention pertains to mining, particularly to oil and gas production and is meant for use in oil and gas well head equipment, oil pipelines, water pipelines and gas pipelines. The stop valve has housing with coaxially arranged connection pipes, a bypass bushing and an eccentric gear. In the housing there is a recess and a ring with a compactible conical surface, a stopper with the corresponding packing conical surface, liquid flow channels and a circular groove under the eccentric gear. The gear is fitted through a chamber and a radial hole made on the housing. The bypass bushing with inlet and outlet channels for flow of liquid through the cavity between the housing and the outer surface of the bushing is fitted into the recess through the stopper and is fixed using a nut. At the butt end of the bushing there is an open slot for aligning, through a wear bushing, the eccentric gear with the side hole in the bushing. On the inner diameter of the bypass bushing there is a projecting edge with a bearing surface in contact with the corresponding bearing surface of the stopper. Inlet and outlet channels are made at an angle to the axis of the housing and shifted from each other in the direction of flow of the pumped medium.

EFFECT: increased reliability, reduced cavitation wear and corrosion of structural components.

2 cl, 3 dwg