BOTTOM-HOLE PUMP Russian patent published in 2012 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: pump includes cylinder, plunger, delivery stock-valve rigidly attached to column of rods through pusher and suction valve assembly. Delivery stock-valve is equipped in its lower part with fishing sleeve with feedthrough channels and has the possibility of restricted axial displacement inside plunger within 18-20 mm. Suction valve assembly is removable and installed in lower part of cylinder in anchor shoe by means of anchor mandrel through O-ring. Suction valve assembly consists of anchor nipple, housing of suction valve with longitudinal feedthrough slots equally spaced in circumferential direction, ball with seat, fishing trunnion provided with possibility of being engaged with fishing sleeve, and delivery stock-valve is installed so that it can contact the plunger along chamfered surface at an angle α = 40-50° to pump axis.

EFFECT: simpler and cheaper design, higher reliability and operating efficiency.

2 dwg