For valves of different brands, are the dimensions the same for valves of the same model?
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For example, for the same 3-inch gate valve with all other specifications being identical, are the distances between the two flanges of valves from different brands always standard? ?
It might be different; I’ve seen ball valves with a DN50 size from different brands, and the flange spacing varied by more than 2 cm.
Three conditions must be met: the same pressure rating, the same nominal diameter, and the same flange sealing surface. However, there are cases where the pressure ratings differ but the connection dimensions remain the same, as specified in HG/T20592-2009
It’s hard to say; some manufacturers deliberately make the connection lengths different. Also, due to different standards, domestic and imported products certainly have different dimensions.
All the data is the same, except for the brand, because there are many old valves at the site that need to be replaced. Basic parameters such as valve type, nominal diameter, material, and pressure rating can be seen. However, the length of the valve cannot be measured with such precision. Because they are all still in use on the pipelines. I’m worried that if I buy it based on these specifications, I might end up with an item of a different length when it arrives. It would be too troublesome to change the pipes as well. . Because the valve brands at the site at that time were not all from the same manufacturer. If I buy a new one now, it will definitely be from one company.
Indeed, some manufacturers produce valves whose structural length and flange dimensions are not made in accordance with standards. Based on the question posed, it is recommended that in future purchases, the structural length of the valves and the dimensions of the flanges should be strictly in accordance with the standards. The pipes that need to be repaired must still be repaired; it’s better to face short-term pain than long-term ones.
I’m just starting to work with this; the one that was installed before must have been the standard version. I haven’t done this before, so I’m a bit worried. It seems that purchasing according to the valve parameters as usual should not pose any major problems. If there are indeed individual differences, then the only option is to change the pipeline.
What the original poster is referring to is likely the structural length of the valve. Even for valves of the same model and specification, it depends on whether the same standard for structural length is applied; if the same standard is used, then the structural length will be identical, but it’s hard to say anything if different standards are used
The structural length of valves is determined in accordance with standards, so it should be the same; a difference of 2mm is still within the normal range. There are variations in the length standards as well, and in such cases the difference becomes greater
See what type of valve it is; generally, ordinary gate valves, ball valves, single- and double-seat valves all have similar dimensions, unless it’s a special type of valve