Core Features "SAX81" Series & Functional Design: The "SAX81" denotes Siemens’ precision-focused linear actuator series, optimized for medium-duty hydronic valve control. It is a 24V AC-powered linear actuator with a 20 mm stroke length and 1200 N thrust rating (≈122.4 kgf)—ideal for 2-way/3-way hydronic valves (e.g., commercial HVAC chilled water valves, light industrial process fluid valves) where balanced thrust, high precision, and reliable operation are required. High-Precision Modulating Control: Equipped with a digital position sensor for analog position feedback (0–10V DC) and proportional modulating capability, enabling valve opening adjustment with ±1% positioning accuracy—critical for stable temperature or pressure control in commercial buildings (e.g., office towers, hotels) or light industrial fluid processes (e.g., food processing temperature regulation). It also supports on/off control for simple full-open/full-close scenarios (e.g., system isolation valves). Robust & Compact Construction: Engineered with a corrosion-resistant aluminum alloy housing and a weight of 1.5 kg (3.31 lbs), suitable for direct valve mounting (via ISO 5211 standard flange) or bracket mounting in commercial HVAC mechanical rooms or light industrial process skids. The housing features IP54 protection (dust-tight, water-resistant), withstanding moisture, dust, and mild vibration—ideal for indoor commercial and light industrial environments. Safety & Reliability Features: Built with industrial-grade safeguards to ensure long-term uptime: Dual overthrust protection: Electronic monitoring (1200 N max) and mechanical limiters prevent damage from valve stem jamming (e.g., sediment buildup, process fluid residue), avoiding actuator or valve failure. Thermal overload protection: Shuts down the motor in case of overheating (e.g., prolonged heavy load, voltage fluctuations), extending component lifespan. Wide voltage tolerance: Accepts 24V AC (50/60 Hz) input with ±15% fluctuation tolerance, ensuring stability in standard HVAC control system power supplies. Seamless Integration & Installation: Designed for plug-and-play compatibility with Siemens commercial BMS controllers (e.g., Desigo CC) and third-party PLCs via standard 0–10V analog signals. It includes a universal ISO 5211 flange (fits most medium-sized hydronic valves) and pre-labeled wiring terminals, reducing installation time by up to 25% vs. non-standard actuators. No specialized tools are required for setup. Typical Applications SIEMENS Actuator SAX81 is engineered for precision medium-duty linear control of hydronic valves—ideal for scenarios needing 1200 N thrust, 20 mm stroke, and ±1% positioning accuracy in commercial HVAC or light industrial systems. Key use cases include: Commercial HVAC Chilled/Hot Water Systems: Controlling 2-way/3-way valves in office towers, shopping malls, or hotels. Modulating control adjusts water flow to match heating/cooling demand, improving energy efficiency and occupant comfort—complying with EN 15513 (HVAC hydronic components) and ASHRAE 90.1 (energy efficiency standards). Light Industrial Fluid Temperature Control: Regulating valves for water, glycol, or food-grade fluids in food processing, pharmaceutical packaging, or electronics manufacturing. High precision maintains consistent process temperatures, while IP54 protection withstands light industrial dust—complying with IEC 60534 (industrial valve standards) and GMP (good manufacturing practices). Large Fan Coil Units (FCUs): Controlling hydronic valves in large commercial FCUs (e.g., airport terminals, hotel lobbies). Sufficient thrust handles larger valve stems, and compact design fits FCU enclosures—complying with EN 14511 (air handling units and FCUs). District Heating/Cooling Distribution: Adjusting valves in district heating/cooling networks for residential or commercial complexes. Position feedback enables centralized BMS monitoring, ensuring balanced flow across multiple buildings and reducing energy waste—complying with EN 12831 (district heating design standards).