| 摘要 |
PURPOSE: A piston of a piston pump having a metal sleeve is provided to reduce manufacturing costs by simplifying manufacturing processes. CONSTITUTION: A piston(10) of a piston pump with a metal sleeve is composed as follows. A valve with a valve seat(22) is formed in the piston through a sleeve(20). The sleeve is composed of a metal material and is inserted into the piston. One or more groove-shaped openings(32) are formed in the piston in a radial direction. A high-pressure sealing ring(16) and/or a valve cage(18) are arranged on the piston. |
