How to choose butterfly valve
Butterfly valve is also called plate valve, is a simple structure of the control valve, can be used for low-pressure pipeline medium switch control of the butterfly valve refers to the closing parts (disc or disc) for the disc, around the valve shaft rotation to open and close a valve.
Valve can be used to control the flow of air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid.It is mainly used for cutting and throttling in the pipeline.Butterfly valve is a disc - shaped disc, in the body around its own axis rotation, so as to achieve the purpose of opening and closing or adjustment.
Butterfly valve disc installed in the pipe diameter direction.In the butterfly valve body cylindrical channel, disc shaped disc around the axis of rotation, rotation Angle between 0°-90°, rotation to 90°, the valve is fully open.
Butterfly valve structure is simple, small volume, light weight, only a few parts.Moreover, the valve can be opened and closed quickly by rotating only 90°, which is easy to operate. At the same time, the valve has good fluid control characteristics.When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics.Butterfly valve has a bomb seal and metal seal two types of seal.Resilient sealing valve, sealing ring can be embedded in the body or attached to the disc around.
Valves with metal seals generally have longer service lives than those with elastic seals, but it is difficult to achieve complete sealing.The metal seal can adapt to higher working temperature, while the elastic seal has the limitation of temperature.
If butterfly valves are required to be used as flow control, it is important to select the correct size and type of valve.The structure principle of butterfly valve is especially suitable for making large-caliber valve.Butterfly valve is not only widely used in petroleum, gas, chemical, water treatment and other general industries, but also used in thermal power plant cooling water system.
PS: the commonly used butterfly valve has two kinds of sandwich butterfly valve and flange butterfly valve.Double-headed butterfly valve is used to connect the valve between two pipe flanges, flange butterfly valve is the valve with a flange, with bolts to connect the valve on both ends of the flange in the pipe flange.
Above is the kind of valve on how to choose butterfly valve in detail.