FIELD: oil and gas production.
SUBSTANCE: device consists of case connected to shutter and having central pass. A cylinder insertion blinded from top and having radial orifices is tightly installed into the pass. The device also consists of a ball valve. The ball valve is made out of rigidly flexible material. Between the seat and radial orifices the insertion is equipped with an additional seat with side channels around the central pass of bigger diametre, than that of the main seat. It facilitates passage of the ball valve at change of pressure exceeding pressure sufficient for maintaining the ball valve within the boundaries of the additional seat.
EFFECT: simplified design, raised reliability and operability.
2 dwg
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