THROTTLE WITH AUTOMATIC CLEANING OF THROTTLING CHANNEL Russian patent published in 2014 - IPC E21B34/16 F16K21/02 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil industry and can be used for operation of flowing gas and oil wells. This device consists of the case fitted in discharge pipe axial channel while male adapter with lengthwise grooves and needle holder is fitted in said case. Case opposite side is equipped with barrel provided with circular ledges to make a circular chamber with said case. Said chamber accommodates spring-loaded circular piston with end valve resting on seat at circular ledge end face. Circular piston and end valve make with the case the circular chamber communicated hydraulically via several bores in the case body with circular channel between said case and discharge pipe. Pusher is arranged inside circular chamber to rest on circular piston and equipped with holder with nozzle pressed by the nut to make a sliding joint with needle holder. Barrel body has radial bores for connection of circular chamber under circular piston with the barrel axial channel overlapped at initial position of end valve body. Said barrel is equipped with adjusting nut for spring hold down. Circular chamber between said barrel and pusher is communicated by drain bore with barrel axial channel.

EFFECT: lower hydraulic drag, higher reliability of structure.

2 dwg