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 an example of using this valve in a real network? Which element has variable K (headloss coefficient)?"

One example might be a case where a valve is manually closed after a pipe break and you want to set up controls to do this during an EPS.

Another example would be a case where you want to partially close a valve that fills a tank, before it becomes full. This might be done in a case where there are multiple tanks in a pressure zone and you want to slow down the filling of the tank closest to the source.

See the following sections in our Advanced Water Distribution Modeling and Management book:

"Throttle Control Valves" and "Pipe Controls", page 107
"Multiple Tanks in a Pressure Zone", pages 339-340

Jesse

I read example in the book. Why do not you use a FCV instead TCV in the example II? What is the difference here in this example between using FCV and TCV?

And about example 1, I need more explanation about how using TCV for it, if you would.

Sim

You could use a FCV if you wanted to throttle based on a specific flow. The TCV approach might be used in a case where you've decided to manually close the valve to a certain position.

Regarding the example of using a TCV for a pipe break: you would place the TCV where the isolation valve is in the real system, configure the headloss characteristics, then set up the condition, action and control to open or close it at the desired time.

You could certainly use the isolation valve element with the status manually set to closed in a steady state, but the advantage of using the TCV with controls in this case is that you have more options for specifying the headloss characteristics for the open position, and you can use controls to change the position during an EPS (like if you wanted to see the effect of a pipe break at a certain time of the day, with that part of the system being closed off for a certain period of time) .

If this doesn't help, please provide some details about what valve you are trying to model, so we can help you find the best modeling approach.

You could use a FCV if you wanted to throttle based on a specific flow. The TCV approach might be used in a case where you've decided to manually close the valve to a certain position.

Regarding the example of using a TCV for a pipe break: you would place the TCV where the isolation valve is in the real system, configure the headloss characteristics, then set up the condition, action and control to open or close it at the desired time.

You could certainly use the isolation valve element with the status manually set to closed in a steady state, but the advantage of using the TCV with controls in this case is that you have more options for specifying the headloss characteristics for the open position, and you can use controls to change the position during an EPS (like if you wanted to see the effect of a pipe break at a certain time of the day, with that part of the system being closed off for a certain period of time) .

If this doesn't help, please provide some details about what valve you are trying to model, so we can help you find the best modeling approach.