butterfly valve operation
The BUTTERFLY VALVE opening and the relationship between the flow,
basically a linear scale changes. If used to control the flow, the flow
characteristics and pipe flow resistance also have close relations, such as two
pipe installation caliber, the form of the VALVE is same, and piping loss
coefficient is different, the flow valves the difference is very big.
In
the opening of butterfly valve, the valve body and butterfly plate front opening
to form shape valve shaft as the center, two side form finish different state,
on one side of the butterfly plate front water downstream direction and move,
another side against water direction and move, therefore, the valve body and
disc form a side like nozzle shape openings, another side similar throttling
aperture openings, nozzle side than throttling velocities much faster, and
throttle valve will produce negative pressure side below, often can appear
rubber seal off.
Butterfly valve operation torque, for the opening and
closing and opening valve direction different the value each different,
horizontal butterfly valve, especially large diameter valve, due to water depth,
valve shaft, the water head torque caused by poor also note allow to ignore. In
addition, the valve inlet side device elbow, form flow deviation, torque, there
will be increased. The valve is in middle when opening, because water flow
torque role, operators need to lock itself.
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