Compared with an oil hydraulic system, a water hydraulic system has fundamental disadvantages of large friction, high leakage, high wear, corrosion, etc. A mechanism of rod-type piston was considered to reduce friction of the piston's movement in a water hydraulic piston pump. Friction and leakage of the rod type piston was analyzed and compared with those properties of the conventional plunger type piston. An experimental device was set up to evaluate friction and leakage of those pistons. A PEEK (Poly-Ether-Ether-Ketone) piston was also tested as another alternative piston of a water hydraulic pump.
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