Q: Butterfly valve structure and working principle? Answer:?
Butterfly valve, also called flap valve, is a kind of regulating valve with simple structure. It can also be used in the switching control mode of low-pressure pipeline medium. Butterfly valve refers to a kind of valve whose closing piece (valve disc or 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 in the pipeline. The opening and closing part of butterfly valve is a disc shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment?

Common faults of pneumatic butterfly valve and their elimination methods
1. Before installation, confirm whether the product performance and medium flow arrow of our factory are consistent with the moving conditions, and insert and clean the inner cavity of the valve. Do not attach impurities and foreign matters on the sealing ring and butterfly plate. Do not close the butterfly plate before cleaning to avoid damaging the sealing ring.
2. It is recommended to use the special flange for butterfly valve, namely HGJ54-91 socket welding steel flange.
3. The best position for installation in the pipeline is vertical installation, but it cannot be inverted.
4. During use, the flow shall be adjusted and controlled by a worm gear box.
5. For butterfly valves with many times of opening and closing, open the worm gear case cover in about two months, check whether the grease is normal, and keep a proper amount of grease.
6. Check the connection parts to ensure the tightness of the packing and the flexible rotation of the valve rod.
7. The metal seal butterfly valve is not suitable for installation at the end of the pipeline. If it must be installed at the end of the pipeline, the outlet flange shall be equipped to prevent the seal ring from overstocking and over positioning.
8. The valve rod installation and use reaction shall be regularly checked for the valve use effect, and any fault found shall be eliminated in time.