Bronze bushings
Bronze bushings
(OP)
Why does the bronze bushings are used in Globe valves not in Gate valves
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RE: Bronze bushings
We don't use bronze very often in new hand wheel operated valves mostly due to cost. Gate valves are typically made in larger volumes so many gate valves use a type of malleable iron casting which is cheaper and preforms well. Globe Valves are lower volume items so many stem bushings are made from bronze bar.
This is not a universal rule their are exceptions and not all globe valves have bronze stem bushings.
RE: Bronze bushings
Use of materials for valves have been changing over the last fifty years for several reasons. Main reasons are raw material costs, and availabillity of new (plastic) materials as replacement.