Is there any standard for calculating the weight of valves?
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RT, I’m looking for a standard to calculate the weight of valves; it doesn’t need to be very precise. Is something like that available?
It is more accurate to use 3D design calculations; if the accuracy is low, one can refer to valve design manuals or similar sources
Either have the valve manufacturer provide it and have it weighed； Either estimate the approximate volume and consider it based on the density of iron; if that’s not possible, just treat it as a lump of iron.
The Process Piping Installation Design Manual for Petrochemical Plants (5th Edition), Part 3, provides parameters such as the dimensions and weights of common general-purpose valves
Go check it on Pipedate