Installed for flow regulation from 0 to 100% discharge and as pressure relief valve.
Two types are used: Cone Valves and Ring Valves. An oil hydraulic or electromechanical operator controls the valves. Flow is in one direction only. Adjacent equipment of operator, control system ( hydraulic, electric, electronic ), discharge liner, connecting pipes is part of the valve supplier.
Installed valves up to a diameter of 2,000 mm ( Aquamilpa / Mexico ) and maximum design heads of up to 216 m waterhead ( Guavio / Colombia ) are within the ANDRITZ HYDRO supply record. Upstream of the regulating valves in many cases a guard valve for maintenance and emergency shut down of butterfly or spherical type is installed.
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