Structural principle of eccentric rotary valve

Structural Principle

The eccentric rotary control valve has a simple flow path and low resistance. Compared with single or double seat valves of the same caliber, it has a greater flow capacity, but its weight is only about one-third of it. The deflection valve adopts rotary motion, which improves the sealing performance of the packing box and has a large output force. Therefore, the valve has less leakage, greater stiffness, and can work reliably under rated pressure difference. The eccentric rotating valve core and valve stem only engage in rotational motion, so the friction force they bear when turning on and off is very small. When the valve core and valve seat are in contact and closed, the flexible arm of the valve core generates small elastic deformation and elastic tightening force under the thrust of the actuator, making the contact between the valve core and valve seat more tight and firm. Therefore, the leakage of the eccentric rotating valve is very small. The thrust required to close the valve simultaneously is smaller than that of ball valves and butterfly valves.

 

Working Principle

Eccentric rotary control valve is a novel structure with low fluid resistance and a straight through valve body structure. The rotation center of the valve core is not concentric with the rotation axis, which can reduce valve seat wear and extend service life; The rear of the valve core is equipped with a guide wing, which is conducive to stable fluid flow and has excellent stability. At the same time, it also has the advantages of large flow rate and wide adjustable range, especially suitable for controlling process systems containing slurries.