What is Cast Iron Bypass Butterfly Valve

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Sep 19,2022

Cast Iron Bypass Butterfly Valve, also known as flap valve, is a kind of regulating valve with simple structure, and can also be used for on-off control of low-pressure pipeline medium.

quality Cast Iron Bypass Butterfly Valve from China manufacturer
The relationship between the opening of the Cast Iron Bypass Butterfly Valve and the flow is basically a linear proportional change. If it is used to control the flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, the diameter and form of the valves installed in the two pipes are all the same, but the loss coefficient of the pipes is different, and the flow rate of the valve will be very different.
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 at a distance of 15°.
When the Cast Iron Bypass Butterfly Valve is in the middle opening, the shape of the opening 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. Therefore, one side of the valve body and the valve plate form a nozzle-like opening, and the other side is similar to a throttling hole-shaped opening. Negative pressure, rubber seals tend to fall off.
The operating torque of Cast Iron Bypass Butterfly Valve varies depending on the opening degree and the opening and closing direction 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 biased 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 action of the water flow torque.

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