A hydraulic system is a drive technology where a fluid is used to move the energy from an electric pump to an actuator, such as a hydraulic cylinder which is available in compact, round body, JIS, or tie-rod types. Nominal pressure ranges from 3.5MPa to 16MPa. Also included in hydraulic equipment are air-hydro units that consist of a converter and a valve unit. It converts air pressure to an equivalent hydraulic pressure, and this hydraulic pressure is used for operating an actuator. Hydraulic filters are available and are designed for installation between the pump and reservoir tank to protect the pump from contaminants.