• TCV model builder import issue

    I have imported shapefiles into model builder and set the Status initial of the TCV layer to reflect if valves are open or closed but in the import they have all come in as 'Active'. See screen grab below. Can someone please help as to why this has…
  • TCV Coefficients Giving Different Results

    Hello, I am trying to use a TCV (butterfly) to keep some backpressure on my well pump and get it into its best efficiency range. I tried using the "Valve Characteristics Curve" data that I've seen referenced in old forums. This leads me to having the…
  • TCV import issue from model builder

    Hi, The valves tab file is imported from mapinfo to waterGEMS using model builder. Few closed valves are imported as open valves. Please could anyone help?
  • Import historic overrides for TCV setting

    Hi! According to the tutorial I should be able to import control overrides for my TCV settings. https://communities.bentley.com/products/hydraulics___hydrology/w/hydraulics_and_hydrology__wiki/24272.scadaconnect-simulator-for-watergems-v8i-selectseries…
  • RE: How do I model a combined throttle control valve and a pressure reducing valve?

    Marilyn, Put the valves in series with the TCV upstream of the PRV. If there is any problem with the network balancing when the model is computed consider changing the dampening limit in the calculation options and the convergence check frequency if…
  • How to use Throttle Control Valve?

    Our network system is operating with throttled valves (with different number of turns for each valve) and I would like to reflect all of it in our water system network in WaterGems. What is the best way and process to apply TCVs in our system?
  • RE: Throttle Valves Using

    Re: "What is the usage of ‘Throttle Valves’ in reality?" A TCV is a flexible valve that can be used in a number of different situations to model headloss through a valve, supporting several different methods of data input. Re: "Could anyone give me…
  • RE: TCV & Globe Valves

    Further to what Mark said, I will add that the selection made from the "Valve Type" field for a TCV (butterfly, globe, etc) allows the program to relate "relative closure" (%) to a discharge coefficient, based on the entered "fully open discharge coefficient…
  • RE: Hammer - Valve characteristics curves are labelled incorrectly

    Hi Sven, I've added some screenshots for the benefit of other members who may follow this post: Valve Type field in HAMMER, where the library defaults can be selected: %Cv vs %closure relationships (yes, they show as %area but they are indeed…
  • Re: Small DIA Valve Closure in Chamber's

    Nikola, I would start by checking the TCV's headloss or discharge coefficient. Often people have this value set incorrectly and they find that, instead of gradually closing over, say, 2 mins, the valves appear to do nothing for a long time and then…
  • Re: valve relative closure

    Benson, Assuming that you're referring to Relative Closure in a valve Operating Rule for a transient simulation in Bentley HAMMER, the below technotes should clarify things for you: Modeling an Initially Partially Closed Valve Modeling Reference…
  • Modeling pump startup against a closed valve in HAMMER

    We are trying to model a pump startup scenario in HAMMER (v 8.11.03.17) with the pump starting 10 seconds into the simulation and the discharge valve starting to open up 15 seconds into the simulation. We followed the Tech Note for startup scenario but…
  • problem w/ TCV during transient analysis

    i defined an operational pattern for a TCV to simulate gradual valve throttling, but the transient model yields unexpected results. The pattern starts at 0% relative closure and gradually (in one second intervals) ramps closed (in 10% increments), so…
  • Re: Using TCV in WaterCAD

    Viktor, For technical questions like these, you should contact technical support . This will ensure a prompt and accurate response. The TCV is used to model various types of valves in terms of either the standard head loss coefficient K (Hl=K*V…
  • Modeling Valve closure in Hammer

    Hi, I am modeling a HDPE treated water pumping main to see the effects of a pump trip and a valve closure (at the end). I am planning on using a altitue valve and it is supposed to close when the tank is full and also another motor operated valve to…
  • Re: problem w/ TCV during transient analysis

    This is usually caused by an unrealistically low headloss (or high discharge coefficient) through the valve during the initial steady state calculations. When this happens, HAMMER thinks that there is vey little headloss across the valve as it shuts …
  • Control valve response to transient event

    Is there a way to model the response of a control valve to a transient event beyond manually inputting the transient operational pattern? An example would be what happens to a PSV when the transient pressure drops below the pressure set point.
  • Re: Valve Curve is undefined in Hammer

    Hi Frank, The General Purpose Valve requires a Flow versus Headloss curve. You select or specify this curve under the General Purpose Valve Headloss Curve property. General Purpose Valves were present in WaterCAD/WaterGEMS so we need to…
  • Re: Modelling with TCV

    Sovan, The table you mentioned defines the valve characteristics, not the closure pattern. Be sure to also define the operating rule, which is the pattern of closure over time. You can also find some advice on modeling TCV closure here: …
  • How to Model Partially Closed Valve with FCV Valve data

    Hello everyone, Can anyone please put some light to explain how to model partially closed FCV\TCV with specific valve data as shown in screenshot or file attached.