The butterfly valve's board equipment is located in the diameter of the pipeline. In the cylindrical channel of the butterfly valve body, the disc shaped butterfly board rotates around the axis, the rotating viewpoint is between 0 ° ~ 90 °, and the rotation to 90 °, the valve is all all Open condition. The butterfly valve structure is simple, small, and light weight, which is composed of only a small number of parts. And only need to rotate 90 ° to quickly open and close. The operation is simple. During the position, the thickness of the butterfly board is the resistance of the medium when the valve is flowed through the valve body. Therefore, the pressure generated by the valve is small, so it has good flow control characteristics. The butterfly valve has two sealing types of elastic seal and metal seal. Elastic seal valve, the sealing ring can be inlaid on the valve body or attached to the butterfly board.
Metal -seal valves are generally longer than elastic sealing valves, but it is difficult to fully seal. Metal sealing can adapt to higher working temperature, and elastic sealing has a defect that is limited by temperature. If the butterfly valve is required to be used as flow control, The first thing is to correctly select the scale and type of valve. The structural principle of the butterfly valve is particularly suitable for making large -caliber valves. The butterfly valve is not only widely used in general industries such as oil, gas, chemical, and water treatment. system.
The defect of the rubber sealing butterfly valve is to save use, because the use of improper use will cause air erosion, which causes the rubber seat to peel off and damage. Generally, the life of the sealing seat is normal under normal circumstances, for 15-20 years of rubber, 80 years of metal- 90 years. But how to choose correctly, according to the requirements of the working conditions. The relationship between the opening of the butterfly valve and the flow of flow basically changes linear share. If it is used to control the flow, the traffic characteristics are closely related to the flow resistance of the pipeline. For example, the two pipeline equipment valve calibers and forms are all the same, and the pipeline loss coefficients are different, and the flow of the valve will be very large. If the valve is in a large situation of fluctuations, the opposite side of the valve board is prone to air erosion, and the valve is damaged.
Perhaps, when the butterfly valve is in the middle opening of 15 °. When the butterfly
valve is in the middle opening, the opening shape formed by the front end of the valve body and the butterfly board is centered on the valve axis. And moving, the other side moves against the direction of the current, so one side valve body and the valve plate form a nozzle -shaped opening, and the other side is similar to saving hole -shaped opening. The torque that occurs in the watery head is not to be ignored. In addition, when the valve inlet side device elbows are formed, the torque will increase, and the torque will increase. When the valve is in the middle opening, because the water flow dynamic torque effects, the operating agency needs to lock itself.
