| 摘要 |
Disclosed is piston pump (10) and piston assembly (30) for such a pump. The piston pump includes a cylinder (20) having an inner wall surface (22) formed around an axis A of the cylinder, and a piston assembly (30) for sliding along said cylinder axis, said piston assembly includes a slideable flexible seal (34) in generally sealing contact with said inner wall surface, and a seal mounting (44), said seal mounting having a plurality of circumferentially arranged members (37) moveable radially of said axis to increase or decrease the size of the seal. |
