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Articles on Valves and Control Valves
http://www.plant-maintenance.com/
Information on Valve Actuator Operating Modes, Valve Concepts, Valve Flow Characteristics, Valve Packing, Valve Seat Leakage Classifications, l Valve Terminology, Flow Recovery Coefficients, and Pressure Recovery Factor.

Water Treatment Solutions
http://www.waterandwastewater.com/
Water Treatment Professional's Manufacturers Directory