Valve's size 3

[CAMN]

Hi, I don't know if this has been asked before (could not find it in the search) but I would like to ask you guys what would be the "normal" size range for control valves.

I mean, the company I work for sells Pibiviesse ball valves which go from 1in up to 60in. What about the other types of valves? Globe, butterfly, plug... do those valves come in such a wide range of sizes?

I would expect butterfly valves to have a small range, considering the pressures it would have to withstand on a +20in application for example. Not so sure about the globe or plug ones.

Thanks.

 

[reverman]

Most butterfly's are 3" to 36". However I've heard of a 2800mm (110") butterfly valves being made.

Globe valves exist for 1/4" to 24" With some rare exceptions above that. The vast majority are 1/2" to 12" typically when you have a line larger than 12" you don't want the pressure losses that a globe valve creates in the line.

Gate valves have about the same range as ball valves from 1/4" to 60"

I'm not sure about plug valves

 

[CAMN]

Wow, never would expect to see a 110'' butterfly valve, you would think that the stem and the disc would be so thick as to cover half of the valve's diameter when open.

Thank you.

 

[stanier]

Who dont you just search the internet for large diameter valves and see what you find. Asking this forum is showing laziness.

"Sharing knowledge is the way to immortality"
His Holiness the Dalai Lama.

http://waterhammer.hopout.com.au/

 

[CAMN]

You think I didn't try that Strainer?

I looked and all I could find are the most used diameters by different manufacturers, not the total range for each one of them.

I'm not interested in knowing who can build the biggest and/or the smallest valve out there, I just want to know up to which size it's recommended to use each one of those types of valves.

I'm asking here because I know there are people with experience to know more about this. I have been working with ball valves for some weeks now and I'm starting to know where it's best to use those rather than say a globe valve, but I don't know much about the others.

Anyway... thanks for your "help" too.

 

[cvg]

it really depends on the industry and the use. And for all applications, you need to evaluate cost, O&M and technical performance.

for instance, if you move to the hydroelectric and dam industry, you can find 84" gate valves, fixed cone valves, sleeve, jet and needle valves, 15 foot rectangular slide gate and sluice gates etc. But not all of these will work in each application, depending on static and differential heads, flow rate, head loss, water quality / sediment, need for throttling or controlling flow rates, etc.

 

[bcd]

For larger butterfly valves, you will rarely find applications that operate at the full ASME class pressures. The shut-off pressures tend to be much lower so the shaft, disc, and seals can be designed for the lower shut-off pressures. Once you get to NPS 30 and larger, the shut-off pressures beging to decrease. Butterfly valves larger than NPS 60 are beyond the limits of many product facility machines, lifting crane capacity, or the size of the doors at the end of the building.

For butterfly valves, min size can vary by manufacturer, but NPS 3 and some NPS 2 are about the limit as the going any smaller, the available flow are when open is too small.

Ball valves, smallest is typically around NPS 1/4. Hard to make the internal parts for anything smaller. Many of the smaller sizes use parts from the larger sizes, and only smaller NPT connections are machined into the bodies.

Max ball valve common commercially is around NPS 24. Of course you can find manufacturers that make bigger sizes, the number of manufacturers starts to decrease rapidlly above NPS 24. The switch from flaoting ball to trunion varies by size and pressure class, but in the 150 - 600 range, designs are typically forced into trunion around NPS 4 to NPS 8 because of the combined pressure forces and weight of the ball are too much for the seats alone to support them.

These are not hard numbers. If you look, you will find exceptions to every one. These are just generalizations and accept them for what they are worth.

 

[Valving]

Butterfly valves could go upto 160" and more (I have 140")
I know there manufacturers with ability to build even bigger ones.
Globe control valves could go upto 36"
Plug valves depending on the type of course could go upto 60" and more.
Knife gate valves could go upto 80" and more
Gate valves upto 108" more (fabricated steel)

 

[Baram]

In South Korea (Cephas pipelines Co.) they already have supplied 160" butterfly valves for sea water application for middle east from nickel aluminum bronze alloy as material.


Baram