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Just relaised, you wrote why is it called gland not what does it mean.. apologies for the misunderstanding

Hi all, If you're talking about glands in reference to valves? then a gland packing is the space around a valve stem as it rises up from the valve. I think its a safety feature which ensures pressurised fluid doesn't escape... Hope this helps

Hey everyone, Im doing some work on valve flow coefficients and at the moment am writing a report of my research/calculations. I'm writing about the friction factor and was wondering where the Swamee Jain Equation comes from? is there a derivation of it, if so does anyone know where I can find...