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Stormwater Flow ControlsStormWater Flow Control The Hydro-Valve is a vortex flow control device for controlling stormwater flow to a specific rate before discharge into a local stormdrain orwater course. Sizes are available between 1 –200 l/s depending on head height. Design JFC Hydro-Valves are manufactured to customer specifications. They are custom designed to achieve a specified design flowrate at a given head height. The units are designed to fit into one of the followingmanhole types depending on specification • Ø1200mm • Ø1500mm • Ø1800mm • Rectangular Manhole Quality Assurance JFC Hydro-Valves are manufactured to ISO 9001:2000 quality assurance system. Installation JFC Hydro-Valves unique patented design allows for quick and easy installation onto various types of manholes (see above). The unit is fixed to the inside wall of the manhole with a number of steel stud anchors. A manual by-pass is also incorporated in the valve for remote operation in the unlikely event of a blockage. Operation The HYDRO-VALVE is a device for controlling stormwater flowby hydraulic effectwithout requiringmoving parts. At low flow rates, water entering through the inlet passes through the vortex chamber to the outlet with no restriction. As flow rate increases water enters through the inlet with enough energy to create a vortex in the vortex chamber which results in a considerable pressure drop between the inlet and the outlet restricting the flowto the allowable discharge. The Hydro-Valve therefore operates automatically with no moving parts and no external power source. A typical application of this valve is to control the flow from storm water attenuation tanks 
Performance Design Flow - The maximum flow that is required .i.e. maximum allowable discharge. This point is different for each individual Hydro-Valve depending on specific specifications which is usually stipulated by the local authority. Flush Flow - The point at which the vortex begins to initiate and has a throttling effect which starts to restrict the flow, sending the performance graph in the opposite direction. Kick-Back Flow - This is the point at which the vortex has fully initiated and at which point the curve begins to return back to follow that of a more conventional flow control.
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