Siemens Actuator SKP55 Series
Product Description
Siemens SKP55 Series Differential Pressure Gas Valve Actuators
Siemens SKP55 Series actuators integrate electrohydraulic gas valve operation with differential pressure regulation. Designed for industrial combustion equipment, they control gas differential pressure in response to combustion air differential pressure, maintaining a consistent 1:1 relationship across the operating air range.
When fitted to compatible Siemens VGx/VRx gas valves, the SKP55 supports gas safety shutoff and differential pressure control. Its electrohydraulic mechanism provides damped valve opening and rapid closure when electrical power is interrupted.
Key Features
- Integrated differential pressure governor maintains a fixed 1:1 gas-to-air differential pressure ratio
- Electrohydraulic mechanism for gas valve actuation
- Controlled, damped opening and valve closure in less than 1 second during shutdown
- AC 120 V and AC 230 V supply variants, depending on model
- Maximum power demand of 10 VA for European versions
- Available with or without an end switch for closed-position indication
- Compatible with gas families I–III when used with suitable valves
- IP54 protection, with IP65 achievable using the AGA66 accessory under specified installation conditions
Industrial Applications
Siemens SKP55 actuators are suitable for gas combustion equipment that requires differential gas pressure to follow combustion air differential pressure. Common applications include:
- Industrial gas-fired burner installations
- Industrial boiler systems
- Combustion plants incorporating heat recovery equipment
- Burner installations with varying combustion chamber or burner pressures
- Burners equipped with adjustable air and fuel mixing devices
- Systems with negative pressure on the gas side or combustion air side
Siemens SKP55 Model Variants
- 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
Selection Note: Check the complete actuator designation, electrical supply, compatible gas valve and mounting requirements before ordering. Installation and governor adjustments must be carried out by qualified combustion system technicians.
Specifications
Siemens SKP55 Actuators – Technical Data and Specifications
| Manufacturer | Siemens |
|---|---|
| Actuator Series | SKP55 Series |
| Equipment Classification | Electrohydraulic Gas Valve Actuator |
| Integrated Governor | Differential Pressure Governor |
| Rated Supply Voltages | AC 120 V (-15%/+10%) AC 230 V (-15%/+10%) |
| Supply Frequency | 50/60 Hz ±6% |
| Maximum Power Requirement | 10 VA |
| Valve Shutoff Response | <1 second at shutdown |
| Typical Valve Opening Rate | Approximately 2 mm/s |
| Gas-to-Air Differential Pressure Ratio | 1:1 |
| Regulated Gas Differential Pressure | 0.03–20 kPa |
| Reference Combustion Air Differential Pressure | 0.03–20 kPa |
| Maximum Allowable Operating Pressure | 120 kPa |
| Parallel Gas Pressure Offset Adjustment | ±0.1 kPa |
| Pressure Regulation Accuracy | <10% at Δpmin <1% at Δpmax |
| Ingress Protection | IP54 IP65 with AGA66 accessory, subject to installation requirements |
| Electrical Safety Classification | Class I |
| Operating Ambient Temperature | -10 to +60 °C -20 to +60 °C with AGA63.5A27 heating element |
| Permissible Relative Humidity | <95% RH |
| Approximate Device Weight | 1.9 kg |
| Supported Gas Families | I–III |
| End Switch Options | With or without an end switch, depending on model |
| Reference Standards | EN 161, DIN EN 88-1 |
Technical Reference: Specifications are drawn from Siemens Technical Data Sheet CC1N7643en, dated 06.04.2022. Individual characteristics may vary according to the selected valve, installed accessories and operating conditions.
Product Specifications
Siemens SKP55 Actuators – Technical Data and Specifications
| Manufacturer | Siemens |
|---|---|
| Actuator Series | SKP55 Series |
| Equipment Classification | Electrohydraulic Gas Valve Actuator |
| Integrated Governor | Differential Pressure Governor |
| Rated Supply Voltages | AC 120 V (-15%/+10%) AC 230 V (-15%/+10%) |
| Supply Frequency | 50/60 Hz ±6% |
| Maximum Power Requirement | 10 VA |
| Valve Shutoff Response | <1 second at shutdown |
| Typical Valve Opening Rate | Approximately 2 mm/s |
| Gas-to-Air Differential Pressure Ratio | 1:1 |
| Regulated Gas Differential Pressure | 0.03–20 kPa |
| Reference Combustion Air Differential Pressure | 0.03–20 kPa |
| Maximum Allowable Operating Pressure | 120 kPa |
| Parallel Gas Pressure Offset Adjustment | ±0.1 kPa |
| Pressure Regulation Accuracy | <10% at Δpmin <1% at Δpmax |
| Ingress Protection | IP54 IP65 with AGA66 accessory, subject to installation requirements |
| Electrical Safety Classification | Class I |
| Operating Ambient Temperature | -10 to +60 °C -20 to +60 °C with AGA63.5A27 heating element |
| Permissible Relative Humidity | <95% RH |
| Approximate Device Weight | 1.9 kg |
| Supported Gas Families | I–III |
| End Switch Options | With or without an end switch, depending on model |
| Reference Standards | EN 161, DIN EN 88-1 |
Technical Reference: Specifications are drawn from Siemens Technical Data Sheet CC1N7643en, dated 06.04.2022. Individual characteristics may vary according to the selected valve, installed accessories and operating conditions.
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