butterfly valve

Butterfly valve is a kind of valve that uses disc type hoist to turn back and forth about 90 ° to open, close or adjust medium flow. Butterfly valve not only has simple structure, small volume, light weight, low material consumption, small installation size, small driving torque, simple and rapid operation, but also has good flow regulation function and closing sealing characteristics. It is one of the fastest developing valve varieties in recent ten years. Butterfly valves are widely used. The variety and quantity of its use continue to expand, and develop to high temperature, high pressure, large diameter, high sealing, long service life, excellent regulation characteristics and one valve multi-function. Its reliability and other performance indexes have reached a high level.

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Butterfly valve is a kind of valve that uses disc type hoist to turn back and forth about 90 ° to open, close or adjust medium flow. Butterfly valve not only has simple structure, small volume, light weight, low material consumption, small installation size, small driving torque, simple and rapid operation, but also has good flow regulation function and closing sealing characteristics. It is one of the fastest developing valve varieties in recent ten years. Butterfly valves are widely used. The variety and quantity of its use continue to expand, and develop to high temperature, high pressure, large diameter, high sealing, long service life, excellent regulation characteristics and one valve multi-function. Its reliability and other performance indexes have reached a high level.


characteristic


1. Butterfly valve has the characteristics of simple structure, small volume, light weight, low material consumption, small installation size, fast switching, 90 ° reciprocating rotation, small driving torque, etc. it is used to cut off, connect and adjust the medium in the pipeline, and has good fluid control characteristics and closing sealing performance.


2. The butterfly valve can transport mud, and the liquid accumulated at the pipe mouth is the least. Good sealing can be achieved under low pressure. Good adjustment performance.


3. The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be described as an energy-saving product.


4. The valve stem is a through rod structure, which has been quenched and tempered, and has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only rotates without lifting operation. The packing of the valve stem is not easy to be damaged and the sealing is reliable. It is fixed with the taper pin of the butterfly plate, and the extended end is designed to prevent the valve rod from bursting out when the connection between the valve rod and the butterfly plate is accidentally broken.


5. The connection methods include flange connection, wafer connection, butt welding connection and lug wafer connection.


The driving forms include manual, worm gear drive, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can realize remote control and automatic operation.


advantage


1. The utility model has the advantages of convenient and rapid opening and closing, labor saving, small fluid resistance and regular operation.


2. It has the advantages of simple structure, small overall size, short structural length, small volume and light weight. It is suitable for large-diameter valves.


3. The mud can be transported and the liquid accumulated at the pipe mouth is the least.


4. Good sealing can be achieved under low pressure.


5. Good adjustment performance.


6. When fully open, the effective flow area of the valve seat channel is large and the fluid resistance is small.


7. The opening and closing torque is small. Because the butterfly plates on both sides of the rotating shaft are basically equal under the action of media, the direction of torque is opposite, so the opening and closing is labor-saving.


8. The sealing surface materials are generally rubber and plastic, so the low-pressure sealing performance is good.


9. Easy installation.


10. The operation is flexible and labor-saving, and manual, electric, pneumatic and hydraulic modes can be selected.


shortcoming


1. The use pressure and working temperature range are small.


2. Poor sealing.


Butterfly valves can be divided into offset plate, vertical plate, inclined plate and lever type according to the structural form.


According to the sealing form, it can be soft sealing type and hard sealing type. The soft seal type is generally sealed with rubber ring, and the hard seal type is usually sealed with metal ring.


According to the connection type, it can be divided into flange connection and wafer connection; According to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric.


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