Valves of the world

A butterfly valve by a valve to the so-called fourth valve. "Butterfly" is a metal rod installed on disk. When the valve closed, the CD-ROM is open, so that it can completely block access. When the valve is open, the CD-ROM is the fourth rotation, thus enabling it to allow unrestricted through. The position of the CD-ROM is the impact outside the valve.

There are different kinds of butterfly valves, each adapted to different pressures and different use. Flexible butterfly valve, which uses the flexibility of rubber, with the lowest pressure evaluation. High-performance butterfly valve for the pressure slightly higher in the system, functions somewhat offset by the way in the location on the disc, thereby increasing the valve seal capacity and reduce its tendency to wear. The most suitable for high-pressure valve system is tricentric butterfly valve, which makes use of a metal seat, able to withstand greater pressure.

Butterfly valves is used in many aspects of our life. One of the most common example of a butterfly valve in the carburetor of the vehicle. In a carbureted cars, "gas" pedal, in fact, operating butterfly valve control engine air intakes. When the driver inhibit gas pedal all the way to the floor, Butterfly valve open all the way, as mentioned above, free access to air through the carburetor. Carburetor, and then let the air, and enough natural gas to maintain the proper air-fuel ratio, through the inlet valve into the combustion chamber, which is ignited engines.

A butterfly valve can also be partially open. When a car is idle, open the valve, only slightly, just enough to allow air to maintain idling. When the pressure on the gas pedal, a small butterfly valve to open further, and so on.