CHRISTMAS TREE Russian patent published in 2013 - IPC F16K11/10 E21B33/03 

FIELD: machine building.

SUBSTANCE: christmas tree includes a tubing head and a tree with a central shaft part. The latter includes two in-series located shutoff devices and a valve with a pressure gauge. A tee-piece is installed between shutoff devices. Side offset of the tee-piece is equipped with a control gate valve, a thermowell, a throttle-gate valve, after which a working gate valve and a throttle are installed in series, which together form the main offset for extraction of the well fluid and the second spare offset through a throttle outlet of the throttle-gate valve for temporary extraction of the product during repair of the main one.

EFFECT: invention has minimum overall dimensions of side offsets and metal consumption at similar operating properties.

1 dwg