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Work principle of orbit hard sealing ball valve

            Work principle: CAM principle makes the valve ball away from the seat sealing surface in a whirl. After rotating in place, the valve ball will be pushed into the seat to realize sealing. When the valve is in full open position, clockwise rotate the handwheel, under the help of the stem nut and thrust bearing, the stem began to descend and drive the sphere begin to spin. Connect rotation handwheel, precision spiral curve groove orbit on the valve stem, affect mutually with guide pin which is embedded in the orbit, driving the ball keep clockwise rotating with the valve stem. When the valve will be closed, valve stem drive the ball rotating 90 °completely without friction with the valve seat sealing surface. Continue to turn the handwheel, again the falling valve stem mechanically oppress the ball through the CAM structure on the bottom of valve stem, making the ball sealing surface contact closely with the valve seat sealing surface, so as to achieve the purpose of the seal.  

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