Butterfly valve Butterfly valve kishoredevadoss9704 (Mechanical) (OP) 14 Jul 17 06:12 Why butterfly valve named has BUTTERFLY..? Can any u please replay thanks in advance RE: Butterfly valve LittleInch (Petroleum) 14 Jul 17 07:55 Because it looks like the wing of a butterfly? Remember - More details = better answers Also: If you get a response it's polite to respond to it. RE: Butterfly valve KoachCSR (Mechanical) 14 Jul 17 13:19 The disc of the valve is center-mounted on the shaft; as LI said, it looks (loosely) similar to the wings of a butterfly. RE: Butterfly valve MFJewell (Mechanical) 14 Jul 17 13:46 Because if you don't torque the bolts to spec, it might fly away.