POLYGONAL RING FOR DRIVING A PISTON PUMP, PISTON PUMP COMPRISING SUCH POLYGONAL RING AND METHOD FOR MAKING THE POLYGONAL RING

摘要

A polygonal ring (10) for driving a piston pump has an annular body (14) which extends around a given axis (A) and has a cylindrical internal surface (15) which extends around the axis (A); three planar external surfaces (16), each of which is parallel to the axis (A) and can exchange compressive forces with a respective piston of the piston pump; and three external surfaces (17), each of which is adjacent to two planar external surfaces (16) as seen in the circumferential direction and is shaped so as to define a recessed zone with respect to a hypothetical circumference (C1) which is centred on the axis (A) and extends through the ends of the external surface (17).