Siemens Double Gas Valves VGD20 VGD40 VGD41 Series

Siemens VGD20, VGD40 and VGD41 Double Gas Safety Valves

Siemens VGD20, VGD40 and VGD41 double gas valves are engineered for safe gas flow isolation in industrial burner installations, boiler plants and gas-fired heating equipment. Designed for integration with Siemens SKPx5 actuators, these valve assemblies support gas shutoff and selected pressure regulation functions within industrial combustion systems.

In approved configurations with the specified SKPx5 actuators, the valves deliver Class A safety shutoff performance in accordance with EN 161. Their controlled slow-opening and fast-closing characteristics help meet the operational safety requirements of industrial gas burner installations.

Key Features

• Dual gas valve configuration for industrial burners and gas supply trains.
• Class A gas safety shutoff in accordance with EN 161 when used with approved SKPx5 actuators.
• Controlled slow opening with rapid valve closure.
• Designed for use with Siemens SKP15, SKP25, SKP55 and SKP75 actuators.
• Provides ON/OFF switching and optional gas pressure regulation functions based on actuator selection.
• Built-in stainless steel strainer helps prevent dirt particles from entering the valve assembly.
• Connection sizes available from 1 inch through DN150.
• Suitable for gas trains serving forced-draft combustion burners.

Available Valve Series

Siemens VGD20 Series

The VGD20 range offers a compact double gas valve solution for industrial gas burner equipment. Installation requires AGF10 threaded connection flanges, with two flanges used for each valve. These models are intended for applications requiring reliable gas safety isolation.

Siemens VGD40 Series

VGD40 double gas valves feature flanged connections for industrial combustion installations. Supplied in nominal sizes from DN40 to DN150, the series includes connection provisions for pressure supervision equipment and gas valve proving systems.

Siemens VGD41 Series

As part of the Siemens VGD4x product family, VGD41 double gas valves are offered in DN40 to DN150 sizes. When equipped with compatible SKPx5 actuators, they support gas shutoff and pressure management functions. The appropriate configuration depends on gas flow demand, operating pressure and the intended control strategy.

Siemens Actuator Compatibility

• SKP15: Standard ON/OFF gas valve actuation.
• SKP25: ON/OFF switching combined with constant-pressure or zero-pressure regulation.
• SKP55: Gas differential pressure regulation.
• SKP75: Gas-to-air ratio regulation.

Industrial Applications

• Industrial steam and hot-water boiler plants
• Gas-fired industrial burner installations
• Automatic combustion management systems
• Industrial heating systems operating on gas
• Gas supply trains for forced-draft burners

Guidelines for Valve Selection

Choosing a suitable VGD double gas valve requires verification of the complete model designation, fuel gas characteristics, nominal connection dimensions, system pressure, required gas throughput and compatible actuator arrangement.

Two Siemens SKPx5 actuators are required for each double gas valve assembly. Incorporating an appropriate valve proving system is strongly recommended to enhance operational safety. Installation, commissioning and maintenance must be carried out by qualified technicians following Siemens documentation and applicable safety regulations.

Siemens VGD20, VGD40 and VGD41 Double Gas Valves – Technical Data

VGD Series Model Reference List

Selection Note: Maximum operating pressure and gas flow characteristics are specific to each valve model. Before confirming a product, review the Siemens Type Summary and performance flow diagrams provided in Data Sheet CC1N7631en.