Ball valve ( 球阀) Appeared in the 1950 s, with the rapid development of science and technology, continuous improvement of production technology and product structure, in just 40 years, has rapidly developed into a kind of main valve class. In western developed industrial countries, the use of the ball Industrial Valves is constantly rising year by year. Manual ball Industrial Valves open close process is introduced: a, open the process: in the closed position, sphere subjected to mechanical pressure of the stem, press on the seat. When turn the handwheel counterclockwise, the valve stem is reverse movement, the Angle at the bottom of the plane to make the ball off the seat. Stem continue to ascend, and valve stem guide pin of interaction in the spiral groove, the sphere began to rotate without some friction. Until to the fully open position, the valve stem to limit position, sphere rotation to the full open position. Second, the shutdown process: closing, rotating the handwheel clockwise, stem began to drop and the ball to leave the seat begin to spin. Continue to rotate the handwheel, the valve stem is embedded in the spiral groove on the role of the guide pin, the stem and ball rotate 90 ° at the same time. Is closed, a sphere has been without contact with the valve seat rotated 90 °. Hand wheel rotation of the last few laps, stem mechanically wedge Angle at the bottom of the plane to the oppression of a sphere, make its strong pressure on the seat, to completely seal.
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Further dialogue of Mech between the approaches, the chapter concludes, could lead to actionable advice on more robust policies that drive both structural change and competitiveness upgrading.