• A butterfly valve is from a family of valves called quarter-turn valves.
• In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod.
• When the valve is closed, the disc is turned so that it completely blocks off the passageway.
• When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid.
• A butterfly valve is from a family of valves called quarter-turn valves.
• In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod.
• When the valve is closed, the disc is turned so that it completely blocks off the passageway.
• When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid.