When the Semi Eccentric Ball Valve is fully open, the water loss is completely unobstructed and the inner cavity is automatically cleaned by the zero runner. The valve core rotates 90 degrees. Automatic flushing valve body cavity. Clean the clutter in the media and the media will not be deposited in the valve cavity. The sphere is hemispheric and has the highest CV value in circulation. The system efficiency of the pump is enhanced and the abrasion is reduced to a minimum. Because the sphere is hidden on one side of the valve cavity and forms a straight-through channel without flow resistance. Rugged eccentric fixed crankshaft, no vibration, no noise in high flow rate media.