... : Central Air-conditioning Thermostat, Two(Three)-ay Motorized Valve, Electric Modulating Valve, Electric Damper Valve, Motorized Damper Actuator, Air-conditioning Energy Meter, VRV Controller ... : Static Balancing Valve, Dynamic Balancing Valve, Two-way Dynamic Motorized Valve, Dynamic Motorized Modulating Valve, Self-operation Differential Pressure Balancing Valve and ...