Even though people explain it to me, I still don't quite understand what is the difference between a circuit balancing valve and a pressure reducing valve.

Does anyone out there know what is the largest valve ever built in terms of orifice diameter? It's not an application specific question just something that came up in a discussion.

how does one work, where is it fitted etc? I am interested, and this will help me spec one when talking to the vendor.

Can anyone come up with a possible solution? I read this to mean they want 2 valves, one 2" or smaller and the other sized to meet the remaining CV. Any suggestions are appreciated.

Does anyone have any experience of this sort of application,things to look out for etc,Would a differnt trim help?,is it benificial to keep away from supersonic flow and what are the possible negative

I am looking for the equation for delta P across a control valve. I am looking for non-choked, compressible, turbulent flow with or without fittings attached. I have the equation to solve for C, but

Can some one provide the standard/Spec which specifies Fugitive Emmission Test Requirement and Test Method?

When describing allowable leakage, the standard refers to ".01% of rated valve capacity". Rated valve capacity is defined as "the quantity of test fluid that would pass through the valve at rated trav