Structural length of socket weld valves
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Is Table 2 in 4.3.2 of GB/T 12221 applicable to the nominal length of socket-weld ball valves? I would appreciate some guidance from experts, thank you!
This post was last edited by Thank goodness you're here on 2018-10-18 at 10:52. I’m not familiar with this standard, but in clause 4.3.1, Figure 1, there is a diagram showing butt welding; so it should include socket-welded valves as well, right?
The structural length of this product is not standard; it’s determined by the manufacturer themselves
It is not suitable; the length of socket-welded valves is mostly determined by the manufacturer’s standards
I checked the manufacturer’s samples, and indeed the length of the welded valves specified in GB/T 12221 is different from the length of the socket-welded valves shown in those samples
Please refer to the preface of GB/T 12221 below; it seems that this standard is not suitable for socket-welded valves. The nominal length of socket-welded gate valves, check valves, and globe valves can be determined according to JB/T 7746; then what standard is used for the nominal length of socket-welded ball valves? I would appreciate some guidance from experts, thank you!
Normally, the length standards for socket welding are not standardized; if a standard must be followed, it is the factory’s own standard.
For the structural length of gate-type stop socket weld connections, the national standard can be found in JB7746; there is no standard for the American standard, which is generally similar to the national standard. There is no corresponding standard for ball valves; they follow the manufacturer’s standards.
Small-diameter socket-weld ball valves are generally manufactured to factory standards, and there are slight differences in product dimensions among different valve manufacturers.