Siemens S55180-A157 N/C Zone Valve Actuator Non-Spring Return 24VAC 0-10VDC
The Siemens S55180-A157 N/C Zone Valve Actuator (Non-Spring Return, 24 VAC, 0-10 VDC) is an electronic actuator that modulates zone valves in HVAC hydronic systems. It operates by converting a 0-10 V control signal into precise valve positioning, regulating hot or chilled water flow to maintain set temperatures. Used in air handlers, radiant systems, and fan coil units, it improves zoned climate control, enhances comfort, increases energy efficiency, and supports smoother system responsiveness with reliable, accurate valve actuation.