L/D Factor for 3 way valves..

[jamesbanda]

sorry for a short question.. I'm struggling for a decent reference for the L/D for standard 3 way valves..

I normally use 1 eblow and a valve, which is conservative but on a recent calc I exceed 3% inlet line losses on an RV. So I'd prefer the calculations to show less than 3% so I dont need to argue why over 3% is ok, there are reasons why we cannot enlarge line size etc..

thanks in advance

James

 

[trashcanman]

There are many flavors of 3-way valves. Diverting, modulating, solenoid.... Contact the manufacturer about your particular valve and get it in writing.

 

[BigInch]

There are probably just as many reasons why should not allow the smaller diameter piping. Especially this one. According to King's Pipeline Handbook, McGraw-Hill, a fully opened angle valve will have an equivalent length of 100 (6" diameter) to 200 (18") and 500 (30") pipe diameters.

Independent events are seldomly independent.

 

[katmar]

If you are designing that close to the edge then you must get the correct data from the valve manufacturer and not rely on generic guidelines.

Katmar Software - AioFlo Pipe Hydraulics

http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"

 

[BigInch]

I'm going to buy a rental unit at "The Edge". It seems to be a very popular place to go.

Independent events are seldomly independent.