Siemens VGG Series

Series Overview

The Siemens VGG Series is a family of industrial gas regulating valves designed for controlled fuel flow modulation in combustion systems.

Unlike safety shutoff valves that provide only open/close functionality, VGG valves enable proportional gas flow adjustment when paired with compatible servo actuators.

Function Within a Combustion System

In an industrial burner architecture:

• The burner control unit manages sequencing and safety logic
• The actuator provides mechanical positioning
• The VGG valve regulates fuel flow volume

The VGG Series ensures that gas supply dynamically matches burner load requirements, supporting stable combustion across ignition, partial load, and full load operation.

Regulation vs. Safety

It is important to distinguish between gas regulation and safety shutoff:

In compliant industrial systems, both regulation and safety shutoff components are required.

Typical Applications

The VGG Series is widely applied in:

• Industrial gas-fired burners
• Commercial and industrial boilers
• Process heating systems
• Modulating combustion systems
• Furnace gas control assemblies

It is particularly suited for applications requiring smooth modulation rather than staged operation.

Core Functional Characteristics

All VGG Series valves share the following design principles:

• Industrial-grade gas flow control body: Durable construction for long service life.
• Servo actuator integration: Designed to pair seamlessly with SQM/SQN actuators.
• Stable flow characteristics: Predictable flow behavior across operating pressure ranges.
• Fuel compatibility: Suitable for natural gas and similar industrial fuel gases.
• Continuous duty: Designed for continuous modulation in combustion environments.

The valve body geometry enables predictable flow behavior under varying actuator positions, ensuring precise air-fuel ratio control.

Integration with Siemens Actuation Systems

VGG Series valves are typically paired with:

• Siemens SQM Series servo actuators
• Siemens SQN Series actuators
• Burner management systems (LMV / LME Series)

The actuator controls the valve opening angle, translating electronic control signals into mechanical fuel modulation.

Selection Considerations

When selecting a VGG gas regulating valve, consider:

1. Required maximum gas throughput: Ensure valve capacity matches burner output.
2. Operating gas pressure: Check pressure ratings.
3. Actuator compatibility: Verify mechanical linkage with SQM/SQN.
4. Combustion requirements: Determine required modulation range (turndown ratio).

Proper sizing ensures stable air-fuel ratio control and optimized combustion efficiency.