the initial 2-5mm rain is heavily polluted, and quite small flow. Because of gravity, the rain will first pass through the lower and open discharge pipe in this device. When the rain volume increases, it hits the top heavier, and the floating ball in the sewage pipe is under a certain pressure, to stuck the first flush pipe. Water level in the tank goes up, and the rainwater goes through a horizontal filter and the outlet, to be harvested into the storage tank. after the rain stops, with the reduction of the rainwater stored in the device, the floating ball is automatically reset because of its spring force, and the garbage produced by the filter is brought out, so as to achieve first flush, filtering, automatic discharge of sewage and so on.

Applications:

It can be used as a first flush device in rainwater systems on roofs, under grounds or roads, and generally installed after interception basket device.

Specifications:

Model	YBSQL-100	YBSQL-200	YBSQL-300
Size	Height 555mm, Diameter 200mm	Height 1000mm, Diameter 600mm	Height 1000mm, Diameter 600mm
Inlet and Outlet	DN100	DN200	DN300
Sewage Discarding Pipe Size	DN 50	DN110	DN110
Installation requirement	Roof of buildings less than 9 storeys (if more than 9, take energy-saving measure into consideration)	the drop between inlet pipe and  outlet pipe must be more than 30cm	the drop between inlet pipe and  outlet pipe must be more than 30cm
Control method	Rainfall control	Rainfall control	Rainfall control
Material quality	ABS	PE / FRP / stainless steel / 304	PE / FRP / stainless steel / 304