butterfly valve in the opening
BUTTERFLY VALVE opening and the relationship between flow rate, essentially linearly proportional to the change. If used to control the flow, its flow characteristics and flow resistance of piping is also closely related, such as the installation of the valve bore two pipelines, all forms of the same, but different loss coefficient pipe, valves, flow difference will be great.
If the throttle valve in a significant reduction in the state, the valve plate on the back prone to cavitation, may damage the valve, generally used in a 15 ° outside.
BUTTERFLY VALVE in the opening, the valve body and disc shape of the front-end to form an opening to the valve shaft as the center, on both sides to complete the formation of different states, the front side of the disc moving along the flow direction, the direction of the other side of the counter-current water The move, therefore, the side of the valve body and valve plate-shaped nozzle openings formed like the other side of the similar-shaped orifice opening, the nozzle side than the expenditure side of the flow much faster, and throttle valve below will produce negative side often there will be the rubber seals off.
Valve operating torque, due to open and close the valve opening and its value varies in different directions, horizontal butterfly valve, especially large-diameter valve, water depth, the valve shaft, the water head difference generated by the torque can not be ignored. In addition, the valve inlet side of the device when the elbow to form a bias current, torque will increase. Valve opening in the middle, because the water flow torque to work, organizations need to self-locking operation.
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