Butterfly Valve, Wafer Butterfly Valve
is from a family of valves called quarter turn valves. 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 open, the disc is rotated a quarter turn so that it allows unrestricted passage. The position of the disc is effected from outside the valve.

There are different kinds of butterfly valves, each adapted for different pressures and different usage. The resilient butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high performance butterfly valve, used in slightly higher-pressure systems, features a slight offset in the way the disc is positioned, which increases the valve's sealing ability and decreases its tendency to wear. The valve best suited for high-pressure systems is the tricentric butterfly valve, which makes use of a metal seat, and is therefore able to withstand a greater amount of pressure.

Butterfly valves are utilized in many aspects of our lives. One of the most common examples of a butterfly valve is in the carburetor of a car. In a carbureted car, the "gas" pedal actually operates a butterfly valve that controls the engine's air intake. When the driver depresses the gas pedal all the way to the floor, the butterfly valve opens all the way, as described above, to allow air to pass freely into the carburetor. The carburetor then allows the air, and enough gas to maintain the proper air-fuel ratio, to pass through the intake valves into the combustion chambers, where it is ignited by the engine.

Checking pictures on this website:

Wafer Butterfly Valve

Other valves for you:
Ball Valve,  Gate Valve,  Solenoid Valve,  Ball Valve,  Pressure Reducing Valve,  Check Valve, enjoy your stay!

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