1260 SERIES 2 Way Butterfly Valve Fitted With Pneumatic Double Acting / Spring Return Actuator
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A 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.
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 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 combustion chambers, where it is ignited by the engine.
A butterfly valve can also be partially opened. When a car is at idle, the valve is open only slightly allowing just enough air to pass through to maintain the idle speed. When the gas pedal is pressed a little the butterfly valve opens a little further and so on.
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
The butterfly valve has head loss characteristics of a full bore valve. The design is based on use of an engineered disc of the same dia as the bore of the pipe arranged to pivot such that when it is across the bore is close off the flow path. When turned through 90 Â° the disc provides minimum resistance to the flow.
The butterfly valve has been developed for many duties it now provides optimum solution for a leak tight on-off valve supplanting the gate valve. The butterfly valve can be engineered as a small valve of 25mm bore and can be made for extremely large sizes above 5000mm bore. Depending on the valve size high working pressures can be handled.
The main variations for this valve are the methods of sealing the perimeter of the disc in its closed position. The simplest variation is to use an elastomer lined bore which is an interference fit on the disc. The other variations are based on offsetting the disc plane from the axis of rotation allow the disc to close against a circular face seal such that the fluid pressure increases the seal effect. Metallic seals are available allowing the valve to be used for a wide range of fluids at high temperatures.