The launchers & receivers of pipeline can be used for various kinds of medium transmission pipeline, is generally installed at both sides of main pipeline. It is used to launch and receive the pig. The device can be designed as double-direction use according to the requirement of users. Its main structure consists of tube body, quick opening closure and relative connected opening. The launchers & receivers are suitable for the industries of petroleum, natural gas and so on, is the ideal attachment of the pipeline which needs to quickly open or close flange cover. Characteristics of launchers & receivers: It has simple structure and convenient operating. The pig can be installed into the pipeline quickly and safely because of the used quick opening closure; there is also security device which is reliable. The process of launching and receiving the pig can be directly indicated through installing the indicator. Application field: Various kinds of oil, gas, water, chemical industry and new built pipeline