procurement of concentric butterfly valves with and without electrical actuators and master control station along with amc for 5 years for various iocl locations. , concentric butterfly valves with electrical actuator , size - 80 mm , concentric butterfly valves with electrical actuator , size - 100 mm , concentric butterfly valves with electrical actuator , size - 150 mm , concentric butterfly valves with electrical actuator , size - 200 mm , concentric butterfly valves with electrical actuator , size - 250 mm , concentric butterfly valves with electrical actuator , size - 300 mm , concentric butterfly valves with electrical actuator , size - 350 mm , master control station ( 60 channel )