Butterfly valve installation issues
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How to choose the length of the connecting fittings when installing a butterfly valve in a pipeline? Thank you for your advice
The question posed by the original poster isn’t very clear What specific type of connector are you referring to?
Do you mean bolts and nuts? We usually choose matching ones
The length of fasteners (double-headed studs or bolts) can be determined through calculation. For the specific calculation method, please refer to Appendix A of HG20613-97. This value is related to the flange thickness (associated with the design pressure class), the flange type (type of sealing surface), the gasket thickness, and so on. For wafer-type butterfly valves, the length of the butterfly valve itself also needs to be taken into consideration. For non-butterfly valves with flanges, it is usually possible to take it easy – one can simply refer to HG20613-97 and select the appropriate values based on the design pressure and flange type.
You mean the bolt, right? You can refer to the Catalog of such butterfly valves.
Butterfly valves come in flanged and wafer types; the connection methods for these two types are different, and the length of their connecting components also varies.
For wafer-type butterfly valves, make sure that the valve disc does not touch the flanges when the valve is opened or closed; nothing else needs to be considered
The original poster’s question isn’t very clear. If it refers only to fasteners, the answers given by the people above are all good; what’s important is to determine the type of butterfly valve you have: wafer-type or non-wafer-type. However, this is also related to the supply provided by the owner. For our last project, as is usual, we chose non-butterfly-type butterfly valves, but what arrived at the client’s site were butterfly valves of the butterfly type! It’s really frustrating! Hehe... I suggest the original poster provide more details about the question, specifically which aspect is meant! :)
Special attention should be paid when installing wafer butterfly valves in plastic pipes; for the same diameter, such valves are prone to getting stuck and failing to open.
If you find it troublesome, you can ask the manufacturer to do it.