Butterfly installation considerations :

Butterfly valve maintenance precautions:

The valve opening degree and the relationship between the flow rate , substantially linearly proportional to the change . If you are used to control the flow , the flow resistance of the flow characteristics and piping is also closely related , such as the installation of two pipelines valve diameter , so the whole form of the same , but different pipe loss coefficient , flow valves will be great differences . 

Valve operating torque , due to open and close the valve opening its value varies in different directions , horizontal butterfly valves, especially large diameter valves, due to the depth of the valve shaft, the torque generated by the water head difference can not be ignored . Further , the inlet side of the valve means bend to form a bias current , torque will be increased. When the valve opening in the middle , the moment in the water flow , the operating mechanism requires self-locking.

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