In the 1930s, the butterfly valve was created in the United States, and in the 1950s, it was introduced to Japan. While it did not become commonly utilized in Japan until the 1960s, it did not become well-known here until the 1970s.

The butterfly valve’s key characteristics are its light weight, compact installation footprint, and low operating torque. The butterfly valve weighs around 2T, whereas the gate valve weighs about 3.5T, using DN1000 as an example. The butterfly valve has a strong level of durability and dependability and is simple to integrate with different drive mechanisms. The drawback of the rubber-sealed butterfly valve is that, when used improperly as a throttling valve, cavitation will happen, causing the rubber seat to peel and become damaged. The correct choice, therefore, relies on the demands of the working conditions. The flow rate essentially changes linearly as a function of the butterfly valve’s opening.

If utilized to regulate flow, its flow characteristics are closely correlated with the pipeline’s flow resistance. The flow rate of the valves, for instance, will vary significantly if two pipes are fitted with the same valve diameter and form, but different pipe loss coefficients. Cavitation is likely to happen on the back of the valve plate while the valve is in a heavy throttling position, which could harm the valve. often applied outside at 15°.

The butterfly valve forms a separate state when it is in the middle of its opening, when the butterfly plate’s front end and the valve body are centered on the valve shaft. One butterfly plate’s front end moves in the same direction.

As a result, the valve body’s one side and the valve plate combine to form a nozzle-like aperture, while the other side resembles a throttle. The rubber gasket detached. The butterfly valve’s operating torque varies according to the valve’s opening and closing orientations. Due to the depth of the water, the torque produced by the differential between the top and lower water heads of the valve shaft cannot be disregarded for horizontal butterfly valves, especially large-diameter valves.

Additionally, a bias flow will form and the torque will rise when an elbow is inserted on the inlet side of the valve. Due to the effect of the water flow torque when the valve is in the middle of opening, the working mechanism must be self-locking.