液压接头的液压系统辅助元件包括油箱、滤油器、油管及管接头、密封圈、快换接头、高压球阀、胶管总成、测压接头、压力表、油位油温计等。液压油是液压系统中传递能量的工作介质，有各种矿物油、乳化液和合成型液压油等几大类。
The auxiliary components of the hydraulic system of the hydraulic joint include the oil tank, oil filter, oil pipe and pipe joint, sealing ring, quick change joint, high pressure ball valve, rubber pipe assembly, pressure measuring joint, pressure gauge, oil level oil temperature gauge, etc. Hydraulic oil is the working medium of transmitting energy in hydraulic system, including various kinds of mineral oil, emulsion and synthetic hydraulic oil.