Q. What is a Reg-U-Flo® Flow Control?
A Reg-U-Flo® Flow Control is a no-moving parts, self-activating vortex flow control device. When the upstream water level reaches a suitable level the water entering the unit spins within it. This causes the formation of an air-filled core which takes up a significant proportion of the outlet of the unit. Water discharges around the periphery of the outlet from the Reg-U-Flo® Flow Control only which enables the use of a significantly larger outlet than if a simple orifice was used. The outlet cross-sectional area can be greater than 400% of the equivalent orifice required to meet the same head / discharge condition.
Q. Do they work under downstream surcharge conditions?
Yes, but an air vent pipe may be required to ensure that the air core can form. The flow through a Reg-U-Flo® Flow Control is dependent upon the physical size of the unit itself and the differential head of water acting upon it.
Q. How much maintenance does a Reg-U-Flo® Flow Control require?
Quite simply, this is site-dependent. It depends upon the size of the Reg-U-Flo® Flow Control itself (the larger the unit the less the likelihood of a blockage occurring), the nature of the influent (for example a unit of a given size would be more susceptible to blockage were it placed on a foul system than on a purely surface water system) and physical characteristics of the control chamber itself (adequate benching is essential). We have minimum recommended sizes for use within surface and foul water systems and a range of Reg-U-Flo® shapes, each having defined discharge characteristics, to ensure that we tailor the most suitable unit to the specific site conditions in question.
Q. Why should I use a Reg-U-Flo® Flow Control as opposed to a simple orifice which is cheaper?
There are many benefits in using a Reg-U-Flo® Flow Control. Firstly the outlet cross-sectional area of a Reg-U-Flo® Flow Control is typically four times that of an orifice which should result in a significant reduction in the likelihood of a blockage occurring. Thus maintenance costs and problems are also reduced. Secondly, at low upstream heads experienced in the early stages of a storm the vortex does not initiate. Consequently higher flows are passed forward than were an orifice installed (as the Reg-U-Flo® Flow Control outlet is larger) which results in less water being held back in storage. This means that a smaller storage tank can be used with associated cost savings. Typical volume reductions can range from 5 – 30% depending upon the system layout / design storm characteristics.