Butterfly valve features and methods of use
A butterfly valve is a valve in which a closing member (valve or disc) is a disc that rotates around the valve shaft to open and close, and is mainly used for cutting and throttling on the pipe. The butterfly valve opening and closing member is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjusting. The butterfly valve is normally less than 90° from full opening to full closing. The butterfly valve and the butterfly rod have no self-locking capability. For the positioning of the butterfly plate, a worm gear reducer is added to the valve stem. The use of a worm gear reducer not only enables the disc to have a self-locking capability, but also stops the disc at any position and improves the valve's operating performance. Drop Down Grab Bar,Drop Down Grab Rail,Drop Down Toilet Rail,Drop Down Handrail Active Life Healthcare Co.,Ltd , https://www.alh-med.com
The characteristics of the industrial special butterfly valve can withstand high temperature, the applicable pressure range is also high, the valve has a large nominal diameter, the valve body is made of carbon steel, and the sealing ring of the valve plate uses a metal ring instead of the rubber ring. Large high temperature butterfly valves are manufactured by steel plate welding and are mainly used for flue ducts and gas pipes of high temperature media.
The advantages of the butterfly valve are as follows:
1. It is convenient and quick to open and close, labor saving, small fluid resistance, and can be operated frequently.
2. Simple structure, small size and light weight.
3, can transport mud, less liquid in the pipe mouth.
4, under low pressure, can achieve a good seal.
5, the adjustment performance is good.
The disadvantages of the butterfly valve are as follows:
1. The use pressure and working temperature range are small.
2. Poor sealing.
The butterfly valve can be divided into a bias plate type, a vertical plate type, a slant plate type and a lever type according to the structure. According to the sealing form, it can be divided into two types: a relatively sealed type and a hard sealed type. The soft seal type is generally sealed with a rubber ring, and the hard seal type is usually sealed with a metal ring.
According to the connection type, it can be divided into flange connection and clip type connection; according to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.
The following matters should be noted in the installation and maintenance of the butterfly valve:
1. When installing, the valve flap should be stopped at the closed position.
2. The opening position should be determined according to the rotation angle of the disc.
3. Butterfly valve with bypass valve, open the bypass valve before opening.
4. It should be installed according to the installation instructions of the manufacturer. The heavy butterfly valve should be provided with a solid foundation.