CUTOUT VALVE FOR GAS WELL Russian patent published in 2010 - IPC F16K17/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is intended for automatic cutout of fluid flow of gas well at emergency pressure increase in it and can be used during development and design of cutout valves installed in tubing strings. Cutout valve for gas well includes body with a seat, shutoff member, control unit of shutoff member, which includes spring-loaded stock with axial channel, which is installed in the body with possibility of axial movement and which forms together with the body an annular cavity for arrangement of control agent regulating the stock, sealing stop rings. Body and stock are composite. Support elements of the construction taking the force of stock spring and interacting with mating stop surfaces of the housing and stock are provided with identical mounting seats and with possibility of being moved from one end of the stock to the other one. In inlet part of axial stock channel there installed is replaceable shaped bushing; annular cavity is provided with possibility of simultaneous damping of channels supplying the control agent. Stock spring consists of several parts with possibility of changing its elastic force, by removing one or several parts at simultaneous damping of annular cavity.

EFFECT: simplifying valve service and repair.

2 cl, 3 dwg