Oil seals or seals are components of the hydraulic sealing system. The hydraulic equipment acts as a seal during the operation process, enabling the hydraulic equipment to convert hydraulic energy into mechanical energy to achieve the operating effect. Depending on the application, different types of seals can be combined. Example: In hydraulic cylinders, dust seals, piston rod seals, support rings, anti-fouling seals, piston seals, and wear-resistant rings are used in combination. For example, in a hydraulic motor, a high-pressure skeleton oil seal is used in combination with an O-ring. Commonly used classifications are hydraulic seals for reciprocating motion and skeleton seals for rotary motion. The common types of hydraulic seals are: IDI ISI HBY DKB BRT SPGW SPGO KZT WR T3P ORING UNS IUH, and the commonly used oil seal types for skeleton seals are: TC TCN TB VB VC TCZ TB4 TC4 DB DC SB MG VR, etc.