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Butterfly valve is a kind of valve whose closing part (butterfly plate) is a disc and rotates around the valve shaft to open and close. It mainly plays the role of cutting off and throttling on the pipeline. The butterfly plate is driven by the valve rod. If it is turned 90 degrees, it can be opened and closed once. By changing the deflection angle of the butterfly plate, the medium flow can be controlled. The commonly used butterfly valves are clip type butterfly valve, lug type butterfly valve and flange type butterfly valve. Butterfly valve is suitable for producing furnace, gas, natural gas, liquefied petroleum gas, city gas, cold and hot air, chemical smelting and power generation environmental protection, building water supply and drainage and other engineering systems to transport all kinds of corrosive and non corrosive fluid medium, used to regulate and cut off the flow of medium. p >
1.Correcting holes are made on flange according to standard, easy correcting during installation.
2.Through-out bolt or one-side bolt is used. Easy replacing and maintenance.
3.Shaft and disc are connected by pin, torque screw or pin less, to achieve the opening and closing.
Cryogenic butterfly valves refer to butterfly valves that can be used in low temperature conditions. Butterfly valves with operating temperatures below -40°C are usually called low temperature butterfly valves, which are mainly used in chemical plants such as ethylene and liquefied natural gas. The output liquid cryogenic medium, such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., is not only flammable and explosive, but also vaporizes when the temperature rises, and the volume expands hundreds of times when it is vaporized.VIEW MORE >>
The double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve. Its structural feature is that the axis of the valve stem deviates from the center of the butterfly plate and the center of the body. The double eccentric effect enables the butterfly plate to be released from the valve seat immediately after the valve is opened, which greatly eliminates unnecessary excessive squeezing and scratching of the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves Seat lifeVIEW MORE >>
The valve stem axis deviates from the center of the disc and the center of the body at the same time, and the rotation axis of the valve seat has a certain angle with the axis of the valve body passage, which is called a triple eccentric butterfly valve.VIEW MORE >>