How the Sureflow Control Valve system works
As the level in the supply tank drops, the float arrangement causes a rotary float valve to operate. This valve allows water pressure to act on the upper side of a diaphram in the valve while venting pressure on the lower side of the diaphram, thereby closing the valve and preventing water flow through the pump.
As the level in the supply tank rises, the float arrangement reverses, causing the rotary valve to operate, reversing the pressure on the diaphram allowing the flow valve to re-open, automatically restarting the pump.
At times of low-flow in watercourses, this system can also automatically restrict the abstraction of water when it is below a minimum level in accordance with environmental considerations. This allows the system to operate fully automatically to the mutual benefit of ourselves and the environment.
Schematic layout of a typical complete system
Schematic showing float operation