What basic requirements should the seals used in hydraulic presses meet?

① The seals used in hydraulic presses should have good sealing performance within a certain working pressure and temperature range and have as little leakage as possible.

②The friction coefficient is small and the friction force is stable, which will not cause crawling and jamming of moving parts.

③It has good wear resistance and long service life, and can automatically compensate for wear and geometric accuracy errors to a certain extent.

④The seals used in hydraulic presses should have good oil resistance and corrosion resistance, be difficult to age, and not damage the surface of the sealed parts.

⑤The seals used in hydraulic presses should be easy to manufacture, easy to use, easy to maintain and low in cost.