Regarding the DN80 2.5Mpa ball valve and the issue of valve body length, why are there two different sizes for the same product?
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There is a valve with DN80 and 2.5MPa rating in the plant; the length of the valve body (the distance between the two flange faces) is around 280. The valve I bought now is also a DN80, 2.5MPa valve, but its body size is only 240. I’d like to ask why this is the case. They’re all standard specifications, with the same pressure and dimensions – so why are there two different versions? Thank you all
Is it because the valve material and manufacturer are different?
I checked again and found a national standard regarding the length of metal valve structures; it contains a table showing that valves of the same model are available in short, medium, and long lengths. I wonder whether manufacturers can choose whichever length they want? Is this indicated on the valve body? I still have to go and measure the gauge distance
Check what the standards are – is there any cutting corners?
When making a purchase, it is necessary to first understand the various performance parameters of the valve, among which the structural length is something that requires attention.
There are a total of 6 lengths for standard ball valves, so it’s best to check the length of your existing ball valve before making a purchase.
This post was last edited by Simply put_myP89 on 2021-7-7 11:39. It was the original poster who made the wrong purchase. For the series below 2.5 MPa, there are three specifications; the ones used on-site are of the long type, he purchased the medium-sized version, and there is also a short-type valve. When buying valves, it seems that only the pressure rating and diameter were specified, and that’s the owner’s mistake. GB/T 12221-2005
Wasn’t the flange distance measured before purchasing?
This post was last edited by In short_myP89 on 2021-7-8 10:18. It’s **already very simple – there are only three options. There are more series abroad. This is a very reasonable standard, directly related to the operating conditions and the location on site.
When buying valves, it’s best to specify the dimensions to the purchasing department. We didn’t know this before; we encountered such situations several times – the valves were too large to be installed, so we had to return them, which delayed production