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Siemens
Siemens SFA71U : Electronic Spring Return Valve Actuator, 24VAC, On/Off Control Input, Normally Closed
MSRP: $199.02$75.63

Actuators
Belimo specializes in the production of actuators for control valves. An actuator is a device that is used to open or close a control valve or air damper in response to a signal from a control system. Belimo actuators are designed to be highly durable and reliable, and are used in a wide range of industries, including HVAC, plumbing, and fire protection.