Grooved Indicating Butterfly Valve
Butterfly valve is a kind of quarter-turn valve, and it is fully open or closed when the disc is rotated a quarter turn to isolate or regulate the flow, with quick shut off. Butterfly valve is generally favored because it costs less than other valve design, and it needs less support because of lighter weight.
Main parts and material (specification)
Worm：Ductile iron or Carbon Steel
Signal gearbox：Housing/cover(ductile iron)
Surface：Epoxy coating as Ral3000
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