VALVES FOR FOSSIL FUEL PRODUCTION AND TRANSPORT WITH SAFETY UNIT Russian patent published in 2015 - IPC E21B34/16 E21B43/12 F16K17/38 

FIELD: oil and gas industry.

SUBSTANCE: application describes safety unit of the valve intended for the fossil fuel production and transport, having at least two safety valves, that are hydraulically and/air pneumatically connected with at least one valve shutoff gear, and at least one of them is made as temperature switched, and at least one another is made as pressure switched such that upon temperature change to value beyond the set temperature range, and/or upon pressure change to value beyond the set pressure range the valve emergency closing is initiated. According to the invention the safety unit is in physical contact with the valve to transfer on it of the valve heat thus preventing the valves inside freezing.

EFFECT: improved design.

9 cl, 6 dwg