Stormwater Flow Controls
StormWater 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.
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
• Rectangular Manhole
JFC Hydro-Valves are manufactured to ISO 9001:2000
quality assurance system.
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.
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
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
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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