How the Cast Iron Bypass Butterfly Valve works

Classification: lndustry News

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Feb 28,2023

The relationship between the opening of the Cast Iron Bypass Butterfly Valve and the flow rate basically changes linearly. If it is used to control the flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, if two pipes are installed with the same valve diameter and form, but the loss coefficient of the pipes is different, the flow rate of the valves will also vary greatly.

Cast Iron Bypass Butterfly Valve
If the valve is in a state of large throttling, cavitation is prone to occur on the back of the valve plate, which may damage the valve. Generally, it is used outside 15°.
When the Cast Iron Bypass 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 different states are formed on both sides. The front end of the butterfly plate on one side moves along the direction of flowing water, and the other side It moves against the direction of the flowing water. Therefore, one side of the valve body and the valve plate form a nozzle-shaped opening, and the other side is similar to a throttle-shaped opening. Negative pressure, rubber seals tend to fall off.
The operating torque of Cast Iron Bypass Butterfly Valve varies depending on the opening and the direction of opening and closing of the valve. 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. In addition, when an elbow is installed on the inlet side of the valve, a bias flow 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.

Key words: Cast,Iron,Bypass,Butterfly,Valve

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