industrial use standard butterfly valve control valve operating specification: when the process fluid in butterfly valve body in straight direction after sports channel and movement, interference with logistics only valve itself. In the open position, the valve plate of the flat went Angle and the smooth surface to make logistics continue to adjust the components without significant side flow. But some of the chuai flow will never happen, because the Industrial Valves plate is located in logistics. Close the valve, the actuator or actuator system has received signal, the strength is passed to the rotary motion, 1/4 rotation axis, also is in 0 ( All closed) And 90 * ( All open) Anywhere in between. When the Industrial Valves is close to min, process all fluid pressure and velocity in all area (on the side of the valve plate back According to the flow direction) , and result in difficulties of stability.

when using diaphragm actuators, this instability would be combined, because it does not produce high thrust to start. Due to the extent of industrial valves butterfly valves range is very poor, 20 to 1) , the final 5% is not to be used for the user. When the valve plate and valve plate contact, have some deformation, making resilience elastomer or flexible outline on the surface of the metal plate and the valve plate bearing.

when open the valve, butterfly valve operation should be the signal lead to valve plate movement and away from the bearing surface. Because in the closed position throughout the mechanical force and pressure on the valve plate, or the handwheel actuator must have some rotation, called outbreak of torsion, the valve opens. Industrial valves using standard requires the torque is the structure of the biggest outbreak requires the implementation of the large institutions thrust to close the valve structure and placement. In this way, close Marine butterfly valve actuator force is larger, the greater the torque and. When the fluid pressure to help put in place the seat, insist on smaller and smaller actuator force torque.

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