Product Overview

Siemens SKP55 Gas Actuators are electro-hydraulic actuators designed for use with Siemens VG series gas valve bodies in industrial and commercial burner systems. These actuators combine safety shut-off, pressure regulation, and air-gas ratio control in a single compact unit, helping ensure stable and efficient combustion performance.

The SKP55 actuator maintains a constant air-to-gas ratio by controlling differential gas pressure relative to combustion air pressure, ensuring the correct fuel mixture even when airflow changes during burner operation.

When powered, the actuator opens the valve gradually to allow controlled gas flow. If power is interrupted, the actuator closes immediately to provide fast safety shut-off, protecting the burner system from unsafe operating conditions.

Because one actuator can perform multiple functions (shut-off, regulation, and ratio control), the SKP55 reduces the number of components required in a burner gas train, making the installation more compact and efficient.

Key Features

Electro-hydraulic actuator for industrial burner gas valves

Integrated air-gas ratio control and pressure regulation

Safety shut-off function with fast closing on power loss

Compatible with Siemens VG series gas valves (½″–6″)

Maintains constant 1:1 air-gas pressure ratio

Visual valve position indicator

Power-on indicator light

Quick-connect wiring terminals

Modular design with 360° installation flexibility

Low power consumption (~10–13.5 VA)

Applications

• Industrial gas burners

• Commercial burner systems

• Steam boiler gas trains

• Industrial furnaces and ovens

• Thermal oil heaters

• Process heating plants

• Combustion systems with air-fuel ratio control

Why Choose Siemens SKP55 actuator?

Reliable Siemens combustion safety technology

Combines multiple gas train functions in one device

Improves burner efficiency with accurate air-gas ratio control

Reduces installation complexity and gas train size

Provides stable combustion even with airflow fluctuations

Designed for demanding industrial environments

Technical Description

The Siemens SKP55 actuator works with VG gas valve bodies to regulate gas pressure based on the pressure difference measured across the air duct. This differential-pressure control ensures that the gas flow always remains proportional to combustion air flow, maintaining the correct air-fuel ratio across the burner’s operating range.

The actuator includes a differential pressure governor, allowing the burner to maintain stable combustion even when air pressure conditions change or when there are fluctuations in combustion chamber pressure.

It is commonly used in recuperative burners, burners with variable air flow systems, and systems where air pressure does not directly represent airflow, ensuring precise combustion control.

Technical Specifications