Diaphragm type remote control float valve is a hydraulically-operated valve with much function. It is installed at the inlet of spool or water tower. When the water level reach to the setting, the main valve controlled by the pilot valve, close and stop supplying water; when the water level falls downward, the main valve controlled by the pilot valve, opens and supplies water to the spool. The water level is controlled precisely and is not interfered by the water pressure. Floating ball remote control valve can be installed freely according to the spool's height and use space. It is easy to maintain and to inspect the valve. The valve is liable, of high strength and of smooth action and is for DN450 or less valve.