A valve housing which is internally formed with a filled liquid passage and a liquid valve which allows or interrupts a communication of the filled liquid passage are provided, and a liquid valve opening/closing air cylinder opens or closes the liquid valve to perform a filling operation of a filled liquid. An outlet portion located at the bottom end of the valve housing is formed by a separate liquid outlet member. A first liquid outlet member which is connected with a gas exhaust passage and used for a carbonated filling operation and a second liquid outlet member which carries a screen on its bottom end and used for a non-carbonated filling operation are interchangeably used. A filling valve which permits a combined use with a carbonated filling operation and a non-carbonated filling operation enables an accommodation for a filling operation which should take place in a clean environment.