For flanged butterfly valves, what are the requirements for the flange bolts?
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For flanged butterfly valves, are there any requirements for the flange bolts corresponding to 4” CL300? When connecting to pipe flanges, should two sets of double-headed studs be used on each side of the flange, or can a single long stud be used for direct penetration connection? There are pictures available; are there any specific specifications in the flange standards? Please advise, experts
For wafer valves, aren’t there any specific requirements? The convenience of nut installation should be taken into consideration; if two sets of bolts are used, the two nuts in the valve area might interfere with each other, or the length of the bolts protruding from the nuts (2–3 threads) could come into direct contact.
It’s a clamp-type design; it’s fine to have one bolt running through it. This is a flange-type design
This flange type also uses two sets of bolts; the through-type is too long
For butterfly valves in the double-flange design, it is recommended to use dual studs
Two sets are used for flanged butterfly valves, and one set for wafer-type ones
A bolt of a size one smaller than the bolt hole will suffice
This is of the flange type, and two sets of bolts are required
The valve is too thin; a single bolt can penetrate it directly. There isn’t enough space for two bolts