Abstract: A piston for a pump includes a hub portion defining opposing outer surfaces and concave lateral portions between the opposing outer surfaces. The piston also includes inserts configured to provide a replaceable surface, the inserts being coupled to each of the opposing outer surfaces. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A seal for a pump includes a seal housing configured to be received in a housing of the pump and a seal assembly received in the seal housing. The seal further includes a seal holder receiving at least a portion of the seal assembly, the seal holder being configured to rotate with respect to the seal housing. The seal also includes a guide coupled to the seal housing and retaining the seal holder, such that the seal holder rotates with respect to the seal housing, wherein during operation of the pump, the seal holder and a portion of the seal assembly rotate. A pump includes the pump seal, and a method for refurbishing a pump seal includes removing and replacing at least a portion of a seal assembly of the pump seal, wherein refurbishing the pump seal does not require removing a pump shaft from the pump.

Abstract: A piston for a pump a hub portion defining opposing outer portions, and inserts configured to provide an adjustable surface coupled to each of the opposing outer portions. The hub portion includes a first hub portion and a second hub portion configured to abut one another. Each of the inserts includes an outer shell and a base portion. The first hub portion includes a plurality of the opposing outer portions, and each of the base portions of the inserts is adjustably coupled to respective opposing outer portions of the first hub portion. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A piston for a pump includes a hub portion defining opposing outer surfaces and concave lateral portions between the opposing outer surfaces. The piston also includes inserts configured to provide a replaceable surface, the inserts being coupled to each of the opposing outer surfaces. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A piston for a pump a hub portion defining opposing outer portions, and inserts configured to provide an adjustable surface coupled to each of the opposing outer portions. The hub portion includes a first hub portion and a second hub portion configured to abut one another. Each of the inserts includes an outer shell and a base portion. The first hub portion includes a plurality of the opposing outer portions, and each of the base portions of the inserts is adjustably coupled to respective opposing outer portions of the first hub portion. A pump includes a housing having an inlet and an outlet, and at least two pistons having a hub portion and inserts. The pump may be a positive-displacement, rotary pump, and the pistons may be circumferential pistons.

Abstract: A seal for a pump includes a seal housing configured to be received in a housing of the pump and a seal assembly received in the seal housing. The seal further includes a seal holder receiving at least a portion of the seal assembly, the seal holder being configured to rotate with respect to the seal housing. The seal also includes a guide coupled to the seal housing and retaining the seal holder, such that the seal holder rotates with respect to the seal housing, wherein during operation of the pump, the seal holder and a portion of the seal assembly rotate. A pump includes the pump seal, and a method for refurbishing a pump seal includes removing and replacing at least a portion of a seal assembly of the pump seal, wherein refurbishing the pump seal does not require removing a pump shaft from the pump.