Power steering system helps drivers steer wheels while operating vehicles by adding energy to the steering mechanism. Energy added to the system by power steering helps drivers to reduce physical strength needed when turning the wheel whether when the vehicle is moving at high speed, low speed, or static.

Types of adding power to the steering system are hydraulic power steering system, electronic power steering system, and electro-hydraulic power steering system (Hybrid). Hydraulic power steering system uses pressurized hydraulic fluids to generate power to the machinery whereas electronic power steering system generates power to the machine by using electric motor. Electro-hydraulic power steering system utilizes the same hydraulic technology but only the hydraulic pressure is generated by a pump driven by an electric motor.

The use of power steering seals is to prevent leakage and retain hydraulic fluids within the system and provide low friction. Mainly, design of power steering seals are for application of reciprocating rack shaft and rotary steering shaft in an automobile steering system. Power steering seals with inserted backup ring have high endurance of pressure to prevent deformation of the seals caused by the pressure.