Ball Model: NQ347 corrosion resistant valve seat ring and ball core presence of large contact area, the switch is not sensitive enough, and upper and lower stems and low material utilization related issues, designed the new corrosion resistant ball through improved design, overcome. casting defects to the energy, materials and environmental protection purposes. introduced this valve technical parameters, characteristics and core components of the valve seat seal structure, improves the sealing quality ball, and improve reliability. In actual operation, It has been well verified, to achieve the desired effect, with a wide range of promotional value and use value. NQ Series 347 947 F1.6 ~ 6.4MPa 647 DN150 ~ 500mm eleven of the ball wear resistance, corrosion resistance, easy to start, and has a self-cleaning function, for conveying slurries or liquid impurities pipeline system. Ball wear Applications: 1, the design, manufacture accordance with the provisions of GB12237-89. 2, the structure of a predetermined length according JB1686-75 or press GB12221-89 and user requirements. 3, flange dimensions and seal type according to the provisions of GB9113.3 ~ GB9113.11-88. 4, valve testing and inspection requirements by ZBJ16006-90.