Abstract: An impeller for a centrifugal pump includes a radially inner hub, and a plurality of blades extending straight and along a direction that is perpendicular to a rotational axis of the impeller. The blades extend from a radially outer end to a radially inner end, and define a generally frusto-conical envelope. A flow control feature is formed between the radially inner end of the blades and the hub. The flow control feature has a curved upper surface.

Abstract: An impeller for a centrifugal pump includes a radially inner hub, and a plurality of blades extending straight and along a direction that is perpendicular to a rotational axis of the impeller. The blades extend from a radially outer end to a radially inner end, and define a generally frusto-conical envelope. A flow control feature is formed between the radially inner end of the blades and the hub. The flow control feature has a curved upper surface.

Abstract: A keyless coupling assembly for connecting concentric shafting components in a sealless pump comprises a first shafting member, a second shafting member and a plurality of torque strips. The first shafting member comprises an annular body and an inner surface disposed within the annular body. The second shafting member comprises a cylindrical body and an outer surface. The cylindrical body is disposed within the inner surface of the first shafting member. The outer surface encircles the cylindrical body and faces the inner surface. The plurality of torque strips is positioned between the outer surface and the inner surface to form anti-rotation grooves to prevent relative rotation between the first and second shafting members.