Structure and application: This valve makes up of main valve, pin valve, ball valve and ball cock. The remote ball cock can control the liquid level of water tower or tank effectively and can cut off or open the valve core to fill water or prevent from discharge. It can control the liquid level exactly. The water level will not disturbed by pressure waving, open and discharge tightly without any discharge, float ball is flexible, and easy to maintain. (The control ball float can set up separately with the main valve), it can be used in automatic water supply system of water tank, water pool, and water tower in plants, mine industry, enterprises and high buildings.