SKP55.011U1 Siemens Controller

Overview

The Siemens SKP55.011U1 is a high-performance electro-hydraulic actuator designed for use with Siemens VG series gas valves. It serves as a multifunctional safety shut-off and differential air/gas ratio controller, ensuring a constant air-to-fuel ratio across varying air volumes. This compact unit simplifies gas train assembly by integrating safety shut-off, pressure regulation, and ratio control into a single component, which reduces the overall weight, size, and complexity of the burner system.

Features

• Safety shut-off and air/gas ratio control integrated into a single unit
• Proof of Closure (POC) switch for end-of-stroke verification
• 1:1 differential pressure ratio for precise air/gas synchronization
• Automatic compensation for combustion chamber back pressure fluctuations
• Slow opening and immediate closing (under 0.8 seconds) upon power loss
• Visible position indicator and “power on” light for easy monitoring
• Modular design allows for 360-degree rotation to facilitate field wiring
• Quick-connect wiring terminals and four-screw mounting for simplified installation

Specifications

• Model: SKP55.011U1
• Operating Voltage: 110 to 120 VAC (+10% / -15%)
• Operating Frequency: 50 to 60 Hz
• Power Consumption: 13.5 VA
• Maximum Stroke: 1 inch (26 mm)
• Opening Time: Approximately 14 seconds for maximum stroke
• Closing Time: Less than 0.8 seconds
• Weight: 4.2 lb (1.90 kg)
• Operating Temperature: 5 F to 140 F (-15 C to 60 C)
• Approvals: UL listed, FM approved, CSA certified, and ISO 9001 certified

Applications

• Industrial and commercial burner systems requiring precise air/gas ratio control
• Burners with negative combustion air pressure levels
• Systems with recuperative burners using combustion air preheating
• Burners where air or gas pressure does not represent actual flow
• High-demand HVAC and boiler systems that require safety shut-off and pressure regulation
• Optimal for premix burner applications to ensure efficient combustion and reduced emissions