Siemens Actuator SKP55 Series

Siemens Actuator SKP55 Series

Siemens Actuator SKP55 Series is an electrohydraulic gas valve actuator equipped with a differential pressure governor. It is designed to regulate gas differential pressure according to combustion air differential pressure, maintaining a constant 1:1 differential pressure ratio across the operating air range.

When combined with compatible Siemens VGx/VRx gas valves, the SKP55 provides gas safety shut-off and differential pressure regulation for industrial combustion systems. Its electrohydraulic operating mechanism ensures damped valve opening and rapid closing when the power supply is interrupted.

Key Features

• Differential pressure governor maintaining a constant 1:1 gas-to-air differential pressure ratio
• Electrohydraulic actuator for gas valve control
• Damped opening and rapid closing in less than 1 second at shutdown
• Available with AC 120 V or AC 230 V power supply, depending on model
• Low power consumption of up to 10 VA for European models
• Available with or without an end switch for closed-position indication
• Suitable for gas families I–III with compatible valves
• IP54 protection rating, upgradeable to IP65 using the AGA66 accessory under specified conditions

Applications

The Siemens SKP55 Series is designed for combustion systems requiring differential gas pressure regulation in relation to combustion air pressure. Typical applications include:

• Industrial gas burner systems
• Industrial boilers
• Combustion plants with heat recovery systems
• Combustion systems with changing burner or combustion chamber pressure conditions
• Burners with adjustable air/fuel mixing devices
• Systems operating with negative pressure on the gas or air side

Available Siemens SKP55 Models

• SKP55.001E1 – AC 120 V, with end switch
• SKP55.001E2 – AC 230 V, with end switch
• SKP55.003E1 – AC 120 V, without end switch
• SKP55.003E2 – AC 230 V, without end switch

Note: Verify the actuator model, supply voltage, compatible gas valve, and installation requirements before selection. Installation and adjustment must be performed by qualified combustion system personnel.