Quick connection is a kind of joint that can connect or disconnect pipelines without tools.The quick joints can be divided into: quick joints for air, quick joints for oxygen fuel gas, quick joints for gas and liquid sharing, quick joints for oil pressure, quick joints for inert gas, quick joints for cooling water temperature and oil, quick joints for semiconductor.This paper mainly introduces lever type quick joint used in petrochemical industry.

According to the models, the lever type quick joint can be divided into 9 models :KJT-A Type B type C type D type E type F type DC type DP type and non-standard type, among which there are 4 male heads of A type, E type F type AND DP type and 4 female heads of B type C type D type AND DC type.

According to the material, lever type quick joint can be divided into four categories: stainless steel lever type quick coupling, brass lever type quick coupling, aluminum alloy lever type quickcouplingt and plastic lever type quick coupling。