GATE VALVE HEADLOSS COEFFICIENT

Hello Elizalde,

It depends on the percentage closure that is achieved with 5 turns of the valve. If you know the value, then you can use the valve characteristic curve to define the relative closure percentage of your throttled gate valve.

How are headlosses determined for TCV's with the different initial status settings?

In the above article refer to the third option, in which headloss coefficient is calculated based on relative valve closure.

Hope this helps.

Also, you could estimate the headloss coefficient for the gate valve based on the default minor loss (K) coefficients found in the minor loss engineering library. For example if you know the fraction open corresponding to the number of turns, you could choose the value from the library for one quarter open, half open, three quarters open, etc.

Please note that a subsequent reply to this thread has been split to a new thread here: Disconnected demand nodes when using gate valve