... valves,safety valves,slurr valves ,diaphragm valves ,check valves,and gate valves. The nominal diameter is DN40--DN 4000mm with the ... as manual,electric,worm drive,pneumatic and eletrohydraulic Structural featuresThe gate structure is simple, flexible operation, light weight, no jamming, ... to adjust to open degrees. The valve is a main control device for the flow rate or the conveying amount of ...