In the hydraulic cylinder, Xin Huaxu O-ring seal is mainly used for static sealing, in the static situation, the working pressure of 20MPa, plus retaining ring up to 40MPa, with special ring, the working pressure up to 200 MPa. Xin Huoxu O-ring because of its installation groove size is small, in the high-pressure thin cylinder is widely used as the main seal.

Y-shaped seals, Yx-shaped seals and U-shaped seals Y-shaped, Yx-shaped and U-shaped seals, the use of oil pressure to make the two lips in the coupling with the coupling of the two surfaces to achieve sealing , The sealing capacity can be increased with the pressure increase, and after wear a certain degree of automatic compensation. Y-shaped, Yx-shaped and U-shaped ring of the working pressure is generally not more than 20MPa, made of polyurethane P5008, Shaw hardness of U-shaped seals over 90, plus ring up to 32MPa working pressure. Xin Huoxu such seals in the high pressure in the following hydraulic cylinder is often used, especially in the higher pressure requirements of the occasion, the use of a more extensive. In the ultra-high pressure hydraulic cylinder is generally not used alone, often with the shaft slip ring combined seal (Stuart) with the use as a piston rod seal.