Screw type rising stem Gate 1.Simple structure 2.Flexible ... and more than 400 sizes such as connection type butterfly valve of quick coupling with self- ... ,slurr valves ,diaphragm valves ,check valves,and gate valves. The nominal diameter is DN40--DN 4000mm ... manual,electric,worm drive,pneumatic and eletrohydraulic Structural featuresThe gate structure is simple, flexible operation, light weight, ...