The rubber sealing butterfly valve for throttling use is weakness, because of improper use will produce cavitation, make rubber peeling, injury, and so on and so forth. For this, now again on international development metal sealing butterfly valve, reduce cavitation area, in recent years, our country is also developing the metal sealing butterfly valve, in Japan in recent years also developed cavitation resistance, low vibration, low noise comb tooth shape of butterfly valve. Under normal circumstances, the life of a general seal seat rubber - 15 years For 20 years, 80 - metal In 90. But how to correctly choose should according to the working condition requirements. Butterfly valve opening and the flow rate, the relationship between the linear basically percentage changes. If is used to control the flow, the flow characteristic and pipe flow resistance have close relationship, such as two install valve pipe diameter and form all the same, and the pipe loss coefficient is different, the flow valves will be a big difference. If the valve is in a state throttling range is larger, the back of the Industrial Valves plate easy cavitation occurs, the possibility of damage to the valve, used in general more than 15 °. Butterfly valve in the opening, the Industrial Valves body and disc front of mouth shape to valve shaft as the center, on both sides of the form a complete different state, the butterfly plate on one side of the front end of downstream water direction, the other side of the upstream water direction, therefore, on one side of the Industrial Valves body and valve plate form like opening nozzle shape, on the other side is similar to throttle aperture openings, nozzle side of more quickly than the throttling lateral velocity, and the side of the throttle valve will produce negative pressure, under the rubber seals often can appear fall off. Butterfly valve, operating torque for the opening and the direction of valve opening and closing its different values, different horizontal butterfly valves, especially large diameter valve, due to water depth, valve shaft, the water head difference generated by the torque also nots allow to ignore. In addition, the valve inlet side bend, form the bias current, torque will be increased. Due to water flow of the opening of the valve is in the middle moment, operators need to be self-locked.
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