Sauter AVF 234S: SUT Valve Actuator with Spring Return

Built for demanding HVAC environments, the Sauter AVF 234S is a heavy duty motorised linear valve actuator engineered to deliver precise, reliable control of hot and chilled water systems. With a high linear driving force of 2,500 N, it handles large 2-way and 3-way control valves, including Sauter's VQD, VQE, VUG, and V6R series with the kind of authority that keeps building systems running smoothly, even under load.

The AVF 234S takes the guesswork out of commissioning. It automatically recognises whether the input signal is continuous (0–10 V or 4–20 mA) or switched (2-point or 3-point), adapting accordingly without manual intervention. Its self-calibrating stroke adjustment, covering 8 mm up to 49 mm, means it matches the exact travel length of the attached valve, ensuring accurate positioning every time.

• Heavy-duty motorised linear valve actuator with a built-in spring return
• Used in HVAC systems to precisely control 2-way and 3-way control valves for regulating hot or chilled water in heating, ventilation, and air conditioning
• Operates large 2-way and 3-way valves (such as Sauter’s VQD, VQE, VUG, and V6R series)
• Responds to continuous control signals (0–10 V or 4–20 mA) or switching signals (2-point and 3-point) from a building management controller
• Drives the valve automatically to a safe end/default position (like fully closed or open) if a power failure occurs
• Delivers high linear driving force (typically 2500 N)
• Self-adjusts to match the exact stroke length of the attached valve (from 8 mm up to 49 mm)
• Automatically recognises whether the input signal is continuous or switched
• Features coding switches to change the operational curve profile (linear, quadratic, or equal-percentage) and running speed

Applications: 
Commonly used in;

• Regulating water flow in cooling towers, chillers, and multi boiler plants
• Controlling air conditioning re-heaters and ventilation zone valves
• Providing automatic safety shut off via spring return power failures