flange butterfly valve flow rate and the relationship between the switch, and basically a linear scale change. 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 large flange butterfly valve in the throttled state, valve plate on the back of the easy cavitation occurs, the possibility of damage to the Industrial Valves, in general more than 15 & deg; External use. Flange butterfly valve in the opening, the valve 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 valve 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. Flanged butterfly valve, operating torque for the opening and the direction of valve opening and closing its different values, different horizontal pneumatic butterfly valve, especially large diameter valve, due to water depth, valve shaft, the water head difference generated by the torque also nots allow to ignore, general large diameter pneumatic butterfly valve, pneumatic butterfly valve to be installed into pneumatic butterfly valve switch quickly, with large output torque, etc. 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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