The Siemens SSB619 actuator is part of the Acvatix™ range, designed for small valve types such as VVP459, VXP459, and VMP459. It operates on AC/DC 24 V and accepts a DC 0–10 V proportional control signal, delivering a nominal force of 200 N with a 5.5 mm stroke. The actuator achieves full stroke in approximately 75 seconds and features automatic stroke identification, manual override with position indication, and parallel connection capability. Installation is simplified with direct mounting via union nut and a plug‑in cable connection. It is ideal for fan‑coil units, induction units, and chilled ceilings, providing efficient and reliable water‑side control in HVAC systems.