PLUNGER PAIR Russian patent published in 2010 - IPC F02M59/44 

FIELD: engines and pumps.

SUBSTANCE: plunger pair includes bushing with two filling symmetrical openings made at a tangent to inner surface of bushing and connected to low pressure cavity located in the pump head, cut-off opening in the bushing, which is located above filling openings, plunger with two radial openings, sealing grooves interacting with cut-off opening and annular groove connected to the cavity above plunger. Pair is equipped with the valve on which the spring acts. Plunger has axial in-series located openings. Axial opening for arrangement of the valve has large diametre, and the other support coil of the spring interacts with the bushing.

EFFECT: decreasing fuel leakage in plunger pair during fuel supply process, stabilisation of cyclic supply and increasing the operating life of plunger pair.

3 cl, 3 dwg