Siemens SSD131.09U 3-Position (Floating) Valve Actuator – 300 N, AC 24V, Fail-in-Place
The Siemens SSD131.09U Actuator is an OEM 3-position floating (non-modulating) valve actuator designed for Pressure Independent Control Valves (PICV) with a 5- or 5.5 mm stroke. It operates on AC 24V and delivers ~300 N (≈ 67 lb) nominal force. Equipped with a manual override, LED position indicator, and UL listing for plenum use, the SSD131-09U is ideal for demanding HVAC / building automation applications.
Key Features
3-position floating control with fail-in-place design
Operates on AC 24V input for standard building automation systems
Provides 300 N nominal force for dependable valve operation
Compatible with Siemens PICV valves with 5 / 5.5 mm strokes
Manual override for setup, testing, and maintenance
LED visual indicator shows actuator position in real time
UL-listed and approved for plenum installations
Technical Specifications
| Brand / Series | Siemens Acvatix / SSD Series |
| Model | SSD131.09U |
| Control Signal | 3-position floating (fail-in-place) |
| Operating Voltage | AC 24 V |
| Nominal Force | 300 N (≈ 67 lb) |
| Stroke | 5 / 5.5 mm for compatible PICV valves |
| Weight | ~ 2 lbs |
| Dimensions | 11 × 7 × 3 in (W × H × D) |
| UL / Plenum Listing | Yes |
| Manual Override | Included |
| LED Indicator | Position visualization |
Applications
- Used with Siemens PICV valves in hot/chilled water systems to control flow precisely.
- Terminal units, VAV boxes, fan coils, chilled ceilings, etc., where floating control is used.
- Systems requiring plenum-rated components or visibility of actuator position via LED.
- Replacement or upgrade for older actuators in floating control circuits.
Installation & Best Practices
Connect to a controller capable of 3-position floating signals (Y1/Y2)
Mount directly to compatible Siemens PICV valves with quick coupling
Use the manual override for setup and maintenance
Confirm operation with the LED position indicator after wiring
Avoid exposure to conditions outside Siemens’ specified ranges
Why Choose Apex Controls
With Apex Controls you get a verified Siemens SSD131-09U actuator with OEM spec, backed by datasheet accuracy, fast shipping, and support from a distributor trusted in building controls since 1990.


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