METHOD OF HEATING CHECK VALVE SHUTOFF ELEMENT Russian patent published in 2012 - IPC E21B34/02 F16K15/02 

FIELD: oil-and-gas production.

SUBSTANCE: proposed method consists in forcing warm extracted medium, for example, reservoir fluid with temperature of 15-25° over outer shaped surface of intenral unit accommodating shutoff valve. Shut off element consists of fixed and moving parts interacting over common equidistance surface and is made up of, preferably, of seat with spring-loaded disc arranged in inner unit case. Valve body has inlet branch pipe and hydrocarbon product discharge branch pipe and cover arranged on body rear. In keeping required temperature of inner unit, it is isolated from valve body by nonmetallic, preferably, rubber mix ring seals. Note here that, additionally, heat losses are reduced by making air chamber between inner unit face and valve body cover.

EFFECT: higher reliability of valve operation.

2 dwg