DRAINAGE DEVICE Russian patent published in 2017 - IPC E21B34/02 F16K31/18 

FIELD: oil and gas industry.

SUBSTANCE: device has upper and lower chambers with a detachable joint. An opening in end of the upper chamber cover is closed by a divider on supports. In the wall of the upper chamber there is an opening of the side outlet. A float in cavity of the upper chamber is connected by rod through throttle partition with a valve unit located in the lower chamber. The lower tip of the rod is equipped with a double valve, the small valve is inside the large one, at that the small valve is made in the form of a hollow cylinder with through holes in the walls configured for moving along the walls inside the large valve with one degree of freedom along the common vertical axis. A discharge bushing is installed in the lower end cover. The saddle is rigidly mounted in the central hole of the bushing; a cage with holes in cylindrical wall is installed on end surface of the discharge bushing along outer diameter. The upper end edge of the cage is connected to the throttle partition.

EFFECT: improved safety.

4 cl, 12 dwg