Siemens SKB82.51U Electrohydraulic Valve Actuator 24V 3-Position Spring Return

The Siemens SKB82.51U is a heavy-duty electrohydraulic actuator designed for precise control of globe valves and pressure independent control valves (PICV) in commercial HVAC and building automation systems. This spring return actuator provides reliable 3-position floating control with fail-safe functionality for critical valve applications.

Key Features:

• 2800 N (629 lbf) positioning force for positive valve control
• 20 mm (3/4-inch) stroke length compatible with standard Siemens Flowrite valves
• 24 VAC power supply with 3-point floating control signal
• Spring return fail-safe function returns valve to safe position on power loss
• Overload-proof design with travel-dependent automatic shutoff in end positions
• Die-cast aluminum housing for durability in mechanical rooms
• Manual override control for maintenance and commissioning
• Visual position indicator for quick status verification
• UL listed for North American installations
• 120-second running time for full stroke travel

The SKB82.51U mounts directly to compatible valve bodies without adjustment, streamlining installation. Optional auxiliary switch or potentiometer feedback available for integration with building management systems. Ideal for heating, cooling, and hydronic control applications requiring reliable actuator performance.