Views: 0 Author: Site Editor Publish Time: 2021-10-02 Origin: Site
Many butterfly valves are used incorrectly, which may cause some unnecessary problems in the future. Today, the valve manufacturer will tell you how to use butterfly valves correctly.
1. The relationship between the opening of the butterfly valve and the flow rate basically changes linearly. If it is used to control flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, two pipelines are installed with the same valve diameter and form, but the pipeline loss coefficient is different, and the flow rate of the valve will also be very different.
2. If the valve is in a state of large throttle range, the back of the valve plate is prone to cavitation, which may damage the valve. Generally, it is used outside 15°.
3. When the butterfly valve is in the middle opening, the opening shape formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, and the two sides form different states. The front end of the butterfly plate on one side moves in the direction of the flow of water, and the other side is countercurrent. Move in the direction.
4. Therefore, one side of the valve body and the valve plate form a nozzle-like opening, and the other side is similar to a throttle opening. The nozzle side has a much faster flow rate than the throttle side, and negative pressure will be generated under the throttle side valve. The rubber seal may fall off.
5. Butterfly valve operating torque has different values due to different opening and valve opening and closing directions. Horizontal butterfly valves, especially large-diameter valves, due to the depth of water, the torque generated by the difference between the upper and lower heads of the valve shaft cannot be ignored.
6. In addition, when an elbow is installed on the inlet side of the valve, a bias current is formed and the torque will increase. When the valve is in the middle opening, the operating mechanism needs to be self-locking due to the water flow torque.
The above is the correct use of butterfly valves that the valve manufacturers have shown you. If you want to learn more about butterfly valves, please continue to pay attention to our news.
