VGD40.125 Siemens Gas Valve

Overview

The Siemens VGD40.125 is a high-capacity, 5-inch (DN125) flanged double gas valve designed for use in gas trains for commercial and industrial burners. This modular valve body consists of two safety shut-off valves in series, providing a critical safety function by ensuring reliable gas flow control and shut-off. It is engineered to be combined with Siemens SKP series electro-hydraulic actuators, which can provide additional functions such as pressure regulation or air-gas ratio control, simplifying the gas train design.

Features

• Dual safety shut-off valves in a single compact body for space-saving installation
• Double seat construction in each valve to achieve high flow rates with minimal pressure drop
• Patented seat design with individual closing springs for each seat to ensure tight shut-off
• Integrated stainless steel mesh strainer with 0.9 mm mesh size to protect downstream components
• Modular design allows for the mounting or replacement of actuators while the valve is under pressure
• Built-in 1/4 inch NPT pressure taps on the inlet, outlet, and between valves for easy testing
• Durable die-cast aluminum body construction suitable for a wide range of gas types

Specifications

• Model: VGD40.125
• Nominal Size: 5 inch (DN125)
• Flow Rate: 580 m3/h (at Δp = 1 kPa air)
• Maximum Operating Pressure: 10 psi (70 kPa dynamic)
• Close-off Pressure: 30 psi (150 kPa static)
• Body Material: Die-cast aluminum
• Connections: Flanged (DN125)
• Permissible Gas Temperature: 14 F to 140 F (-10 C to 60 C)
• Weight: Approximately 40.1 lbs (18.2 kg)
• Approvals: CE, UL listed, FM approved, CSA certified

Applications

• Supervision and control of gas-fired combustion plants and industrial burners
• Safety shut-off valve when used in combination with SKP15 series actuators
• Control valve with safety shut-off function when paired with SKP25, SKP55, or SKP75 actuators
• Suitable for use with gas families I, II, and III, including natural gas and air
• Ideal for high-demand HVAC and boiler systems requiring precise gas pressure regulation