Flange type of the valve
Thread Content
Are the flanges of the valves used in the process pipelines standard flanges according to the Ministry of Machinery standards or those according to the Ministry of Chemical Industry standards? Is it necessary to specifically indicate the flange type of the valve when compiling material statistics?
We default to the standards set by the Ministry of Chemical Industry; if there are any differences, the relevant standard should be specified.
Generally, flanges in accordance with the standards set by the Ministry of Chemical Industry are used; when compiling material statistics, it is necessary to specify the type of flange on the valve (standard number)
Given the standards adopted in your design, it’s of course necessary to specify the flange type; otherwise, there will be many problems later on
It depends on what standard valves you are using; generally, valve standards specify the referenced standards, from which it is possible to determine what type of flange is being used
I usually use American standards; these standards specify the flange style for valves. All we need to do is provide information such as the valve’s design standards, pressure rating, and end face type.
1. Flanges in process pipelines generally do not follow mechanical industry standards. As for whether HG, SH, ASME, or EN/ISO is used, it shall be determined in accordance with the project specifications. 2. Whether it is design materials or statistical data, pipe fittings and valves with flange ends must clearly indicate the type of flange.
Currently, the flanges used on common valves in China comply with the JB standard; aside from a few very rare specifications with different pressures, all others are compatible with the HG standard, with only slight differences in outer diameter and thickness. When ordering valves, it is necessary to specify the type of flange that matches the valve as well as the type of sealing surface
I hadn’t paid attention to this issue before; now, the opinions on the 8th floor and the floors above it differ
It must be noted that these are not the only ones; the valves we commonly use also include those that meet American standards.
For equipment flanges and civil engineering projects, there are many JB standards. Overall, this standard is lower than standards such as SH/HG, but suppliers generally possess this qualification.