Water valve type & size

You need this form of the Bernoulli Equation:

dP/rho + (v₁²/2)*[(A₁/A₂)²-1] + g * dy = 0

Where:

dP = pressure change

rho = fluid density

v₁ = initial fluid velocity

A₁ = initial pipe area

A₂ = final pipe area

g = acceleration due to gravity

dy = change in height

I'm assuming you know your initial pipe size. You know your flow rate, calculate initial velocity, solve for final pipe size.

Yes, globe valves are usually used for throttling applications.

10l/min is a relatively small flow, and 15mm ø piping (¹/₂" in the old money) is suitable. A globe valve in this size is an off-the-shelf item and of relatively low value. Choose a stock item and install it. Don't worry. Be happy.

AquaSuper is a manufacturer of float valves specifically for your needed application. Using Water, providing the information above, we would recommend a ¾" valve.

We offer the 350MTP in a 3/4" for: $45.00 with a 5 year warranty.

Feel free to check us out @ www.aquasuper.com

Or call us @ 305-716-7694 (Miami FL)

Thank you.

1^st Calculate the nominal pipe size of pipeline.

2^nd The size of valve shall be the same size of pipeline.

3^rd If the function of the valve is on/off, I prefer to use gate valve since it will be normally opened and its pressure drop will be minimum.

If the function of the valve is controlling the pressure or flow rate, I prefer to use globe valve.