VALVE ASSEMBLY OF DOWNHOLE CENTRIFUGAL PUMP Russian patent published in 2007 - IPC E21B34/08 

FIELD: oil production, particularly equipment for mechanized oil-and-gas mixture production, namely valves thereof.

SUBSTANCE: valve assembly comprises main valve unit having seat with self-sealed sleeve, locking body with pin, guiding member, stop and sealing collars. Device also has additional valve unit transversal to main valve unit axis and arranged below it. Locking means of main valve unit is kinematically connected with that of additional valve unit through additional pin. Additional pin has smooth projection having flat cross-section and cooperating with inclined wall of trapezoid slot made in flat guiding cam means provided with rods. One rod has head in central part thereof. The head is used as locking body supported by threaded bush orifice surfaces by projecting head parts. The threaded bushes have beads and are built in case walls in diametrically opposite points. The first bush is used as seat and guiding means, another one is used as guiding means and has blind hole. Additional valve unit has support grid, which aligns additional pin relatively valve assembly. Flat guiding cam means is spring-loaded from side opposite to locking body.

EFFECT: increased operational reliability of centrifugal pump.

4 dwg