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    Tideflex flap valve


    I am having some difficulties in modelling a tideflex valve.
    I have received a head discharge curve from manufacturer. Problem is that the head discharge curve changes with the backpressure. (tide)
    I cannot model multiple head discharge curve at once, so my problem is which one I should use. Is it worth using the curve drawn with red from the head discharge data received (bellow) as a full submerged situation?
    The tide that I'm taking into consideration, is higher than the soffit of the valve even at lowest values.
    Here is the head discharge data received:
    Also here is some info from Innovyze about how to model a tideflex, for whom it may concern:

    Unfortunately, there is only the capability to add one of the Head/flow curves to the model. The only useful suggestion would be to pick the most appropriate curve. Usually this would be the curve for the maximum back pressure rating. You may also want to consider which curve is most relevant to the modelling scenarios that you’re undertaking."


    The recommended method for modelling tideflex valves is to represent the valve with a user defined head / discharge curve and an oversized flap valve modelled in series.

    The user defined head / discharge table is populated from manufacturer’s headloss data and the oversize flap valve is required to prevent reverse flow whilst at the same time generating zero or negligible headloss.

    The below schematic shows an example.


    A 450mm diameter duckbill valve is attached to a 450mm diameter outfall pipe. The invert level of the outfall pipe, the initial level of the user defined control and the flap valve invert are all equal. The ‘dummy’ flap valve has been deliberately oversized to 3m so that negligible headloss is produced. A Cd (flap valve) of 0.1 can be used to keep headloss low."


    Last edited by Duncan Kitts; December 1, 2016 at 10:08 AM.

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