Siemens VGD Gas Valves

Siemens VGD gas valves are double solenoid safety shut-off valves designed for industrial combustion systems where enhanced safety integrity is required. By incorporating two independent shut-off functions within a single valve body, VGD valves provide redundant gas isolation in safety-critical applications.

VGD valves are widely specified in industrial burners, boilers, and process heating systems where compliance with higher safety standards is mandatory. They are designed to operate in combination with Siemens SKP actuators and form part of a complete combustion safety system.

Why Specify Siemens VGD Valves

Unlike single-stage gas valves, Siemens VGD valves integrate two solenoid-operated shut-off seats within one valve assembly. This redundant design ensures that gas flow is reliably isolated even in the event of a single component failure.

As a result, VGD valves are commonly required in installations subject to stricter safety regulations or risk assessments, where a single shut-off valve is not considered sufficient.

Typical Applications

• Safety-critical industrial burner systems
• Boilers and combustion plant requiring dual shut-off
• Gas trains designed to meet enhanced safety standards
• Industrial combustion systems with regulatory compliance requirements

For applications where a single shut-off valve is sufficient, Siemens VGG or VGF gas valves may be more appropriate.

Valve Design and Operation

Siemens VGD valves are designed for use with Siemens SKP actuators. Each shut-off seat is actuated independently, ensuring redundant isolation of the gas supply.

Depending on the actuator configuration, a Siemens VGD valve provides fast, reliable shut-off and controlled operation within the gas train.

The compact double-valve design reduces the need for multiple separate shut-off valves, minimising pipework, fittings, and overall system complexity while maintaining a high level of safety.

Compatible Siemens SKP Actuators

Siemens VGD gas valves are compatible with the following SKP actuator series:

• SKP15 – Dual safety shut-off (ON/OFF)
• SKP25 – Dual safety shut-off with constant pressure regulation
• SKP55 – Dual safety shut-off with pressure regulation and differential pressure air–gas ratio control
• SKP75 – Dual safety shut-off with adjustable air–gas ratio control

Correct actuator selection is essential to ensure the valve performs the required safety and control functions within the combustion system.

Available VGD Valve Sizes and Specifications

The table below lists the available Siemens VGD valve models, flange configurations, nominal sizes, pressure ratings, and construction details.

Replacement and Selection Guidance

When replacing an existing Siemens VGD gas valve, the full valve model number shown on the rating plate must always be matched. Valve size, flange type, pressure rating, and actuator configuration must be confirmed to maintain system safety and compliance.

If you are unsure whether a VGD valve is required for your application, or if a single-stage valve may be suitable, technical confirmation is recommended before ordering.

Related Siemens Components

• Siemens SKP gas valve actuators
• Siemens pressure switches
• Siemens burner and flame control equipment