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Siemens VGD20.403U Double Gas Valve Body - 1.5" NPT

Siemens VGD20.403U Double Gas Valve Body, 1.5" NPT

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ManufacturerSiemens

Part numberVVF53.40-25J

Connection Size 1-1/2" NPT

Vent Connection Size 1" NPT

Pressure Tap Connection Size 1/4"

Maximum Operating Pressure 20 psi

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CAGE: 9NK75

Two safety shut-off valves in series Compact double-valve design Inlet valve with flat disc for shut-off Outlet valve with contoured disc for regulation 1" NPT vent connection Compatible with AGF flanges

Product description

The Siemens VGD20.403U is a premium 1.5-inch NPT double-body gas valve meticulously engineered for demanding commercial and industrial burner systems. It features two safety shut-off valves assembled in series, an inlet valve with a flat disc for safety shut-off, and an outlet valve with a contoured disc optimized for pressure regulation when paired with SKP-series actuators. This compact double-valve design ensures efficient integration into gas trains.

This valve is built to global safety standards, including UL-listing, FM-approval, and CSA-certification. It incorporates a stainless-steel mesh inlet filter for downstream protection and dual stem guides for precise valve alignment, making it a reliable choice for safety shut-off, pressure regulation, and air/gas ratio control.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens VGD20.403U. We are committed to providing dependable surplus industrial components to support your operational needs.

Technical specifications

Connection Size	1-1/2" NPT
Vent Connection Size	1" NPT
Pressure Tap Connection Size	1/4"
Maximum Operating Pressure	20 psi
Close-Off Pressure	30 psi
Body Material	Aluminum
Approvals	UL-listed, FM-approved, CSA-certified

Common applications

Commercial burner systems

Industrial burner systems

Gas trains

Double block-and-bleed assemblies

HVAC applications

Compatible systems

Siemens SKP-series actuators Commercial and industrial burner systems

Also known as

Siemens VGD20.403U Gas Valve Body Siemens 1.5 inch Double Gas Valve

Replaces / compatible with

The VGD20.403U requires compatible AGF series threaded mounting flanges for installation, which allow for easy removal of the valve assembly without unions. Always confirm compatibility with your SKP actuator and piping.

Technical note

Expert tip

The AGF10.40U connecting flange accessory is specifically designed for the VGD20.403U valve, simplifying installation and maintenance.

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Frequently asked questions

What are the key components of the Siemens VGD20.403U double gas valve?

The Siemens VGD20.403U consists of two safety shut-off valves in series within a single housing. It includes an inlet valve with a flat disc for safety shut-off and an outlet valve with a contoured disc for pressure regulation, designed for use with SKP-series actuators.