The disadvantage is that rubber seal butterfly valve used for cutting, due to improper use will produce cavitation, so that peeling rubber seat, injury, etc. happen. To this end, and now the international community has developed metal sealing butterfly valve, cavitation area decreases, in recent years, China has also developed a metal sealing butterfly valve, in Japan in recent years has also developed resistance to cavitation erosion, low vibration, low noise comb-shaped butterfly.
Seal seat life in general, under normal circumstances, the rubber for 15 years -20 years, 80 years -90 years of metal. But how to choose the right requirements will have to under the working conditions.
Butterfly valve opening and flow of the relationship between the percentage of change in essentially linear. If used to control the flow, its flow characteristics and piping of the flow resistance is also closely related, such as the installation of two pipelines valve diameter, form, etc. All the same, while the pipe loss coefficient is different from the flow valve will be very different.
If the throttle valve by a big margin in the state of the valve plate on the back prone to cavitation, there is the possibility of damage to the valve, generally used in the 15 ° outside.
Butterfly in the middle of opening, the body and the butterfly plate front-end to form the shape of the openings to valve shaft as the center, on both sides to complete the formation of a different state, the side of the butterfly plate front-end cis-direction moving water, the other side of the direction of counter-current water The move, therefore, the side of the body and the valve plate may form a nozzle-shaped openings, the other side similar to the orifice-shaped openings, the nozzle side faster than the cutting side of the multi-velocity, while the throttle valve side will produce the following negative pressure often occur rubber seal off. ?
Butterfly valve operation torque, due to open and close the valve opening, and its value is different in a different direction, horizontal butterfly valve, especially the large-diameter valve, due to water depth, valve shaft, into the water head difference generated by the torque can not be ignored. In addition, the valves bend when the import side device to form a bias current, torque will increase. The valve opening in the middle, because the water flow torque work, operating agencies need to self-locking.
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