VGD20.403 Siemens Gas Valve

Overview

The Siemens VGD20.403 is a high-performance double gas valve body designed for integration into gas trains within commercial and industrial burner systems. This compact unit consists of two safety shut-off valves in series, engineered to provide safety shut-off, gas pressure regulation, and air-gas ratio control when combined with Siemens SKP series electro-hydraulic actuators. Its modular design reduces the overall size and weight of gas trains by allowing a single assembly to perform multiple functions.

Features

• Modular double-valve design incorporates two safety shut-off valves into a single compact housing
• Inlet valve features a flat disc for safety shut-off while the outlet valve uses a contoured disc for precise pressure regulation
• Integrated stainless steel mesh strainer (0.9 mm) protects valve seats and downstream components from debris
• Dual stem guides ensure precise disc alignment and reliable tight shut-off
• Connection to SKP series actuators allows for slow opening and rapid closing for enhanced safety
• Includes multiple pressure test points (1/4 inch NPT) on the inlet, outlet, and between valves
• Replaceable pilot gas flange and universal mounting plate for flexible installation on either side of the valve

Specifications

• Model: VGD20.403
• Nominal Size: 1-1/2 inch (DN40)
• Flow Rate: 85 m3/h air (at Δp = 1 kPa)
• Maximum Operating Pressure: 20 psi (150 mbar)
• Close-off Pressure: 30 psi
• Vent Connection: 1 inch NPT / 3/4 inch BSP (model dependent)
• Permissible Gas Temperature: 14 F to 140 F (-10 C to 60 C)
• Body Material: Die-cast aluminum
• Approvals: UL listed, FM approved, CSA certified, and CE approved

Applications

• Primarily used in gas-fired combustion plants and forced draft gas burners
• Serves as a safety shut-off valve when paired with SKP15 series actuators
• Functions as a control valve with shut-off features when used with SKP25, SKP55, or SKP75 actuators
• Suitable for use with gases of gas families I, II, and III
• Ideal for double block-and-bleed assemblies in industrial gas trains