Nexus Valve | Manufacturer of Quality Hydronic System Components coil kit,hvac valves,balancing valves,balancing valve,flow control valves,flow control,circuit setter,venturi valve,actuated valves,griswold valves, c Nexus offers solutions in hydronic heating and chilled water cooling systems. Products range from Balancing & Control Valves, Air/Dirt Separators, Air Vents, and Expansion Tanks.