A butterfly valve is a type of valve that opens, closes, or regulates the flow of a medium by reciprocally rotating a disc-type opening and closing member by about 90°. The butterfly valve is not only simple in structure, small in size, light in weight, low in material consumption, small in installation size, small in driving torque, simple and quick in operation, but also can have good flow regulation function and close sealing property at the same time. It has been developed in the past ten years. One of the fastest valve types. Then, the following Xiaobian introduces the butterfly valve principle and the characteristics of the butterfly valve structure.

Butterfly valve principle

1. When the butterfly valve is fully opened, it has a smaller flow resistance. When the opening is between approximately 15° and 70°, sensitive flow control can also be performed, so that in the field of large-diameter adjustment, the application of butterfly valves is very common. Due to the wiping nature of the butterfly disc movement, most butterfly valves can be used for media with suspended solids. Depending on the strength of the seal, it can also be used in powdered and granular media.

2. The butterfly valve is suitable for flow regulation. Because the pressure loss of the butterfly valve in the pipe is relatively large, about three times that of the gate valve, when selecting the butterfly valve, the pressure loss of the pipe system should be fully considered, and the strength of the medium pressure of the pipe plate when the butterfly plate is closed should also be considered. . In addition, it is also necessary to consider the limitation of the operating temperature of the elastic seat material at high temperatures.

3, the butterfly valve structure length and overall height is small, the opening and closing speed is faster, and has good fluid control characteristics. The structural principle of the butterfly valve is best suited for making large-diameter valves. When the butterfly valve is required to be used for controlling the flow, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively.

Butterfly valve structure features

1. The butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, rapid switch, 90 degree reciprocal rotation, small drive torque, etc. It is used to cut off, connect and regulate the medium in the pipeline. Has good fluid control characteristics and closes the sealing performance.

2. The butterfly valve can transport mud, and the least liquid is accumulated in the pipeline mouth. At low pressure, a good seal can be achieved.

3, the streamlined design of the butterfly board, so that fluid resistance loss is small, can be described as an energy-saving products.

4. The valve stem is a through-rod structure. After quenching and tempering, it has good comprehensive mechanical properties, corrosion resistance and scratch resistance. When the butterfly valve is opened and closed, the valve stem only performs rotary motion without lifting operation. The packing of the valve stem is not easy to damage, and the seal is reliable. The utility model is fixed with a butterfly taper pin, and the outstretched end is of an anti-bump type design, so as to prevent the valve stem from collapsing when the stem and the butterfly plate are accidentally broken.

5. Connection methods include flange connection, clip connection, butt welding connection and lug clip connection.

Butterfly valve failure and elimination method

1. Before installation, confirm whether the performance of the product and the arrow of the flow direction of the medium match with the moving conditions. Insert the inner cavity of the valve cleanly. Do not allow foreign matter on the sealing ring and the butterfly plate. Never clean it before cleaning. Allow the butterfly plate to close so as not to damage the seal.

2. It is recommended to use the special flange for butterfly valve, which is HGJ54-91 socket welding steel flange.

3, installed in the pipe position, the best position for the stand, but can not flip.

4, in the use of need to adjust the flow, a worm gear box to control.

5. The butterfly valve with more opening and closing times shall open the worm gear box cover in two months or so to check whether the butter is normal and shall maintain proper amount of butter.

6. Check the tightening requirements of the joints, that is, to ensure the bees of the filler, and to ensure that the valve stem rotates flexibly.

7, metal sealing butterfly valve products are not suitable for installation at the end of the pipeline, such as must be installed at the end of the pipeline, the need to install export blue, prevent the seal ring backlog, over.

8, valve stem installation and use the reaction to regularly check the use of the valve and found that the fault is eliminated.

Editor's summary: The butterfly valve principle and the characteristics of the butterfly valve structure are introduced here, and we hope to help everyone. If you want to know more related information, you can pay attention to this website information.

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