VGD40.125L Siemens Gas Valve

Overview

The Siemens VGD40.125L is a high-performance, flanged double gas valve designed for use in gas trains to provide safety shut-off and control for industrial and commercial burners. This model features an inverted mounting position for pressure switches and pilot gas plates compared to the standard VGD40.125, allowing for greater flexibility in compact gas train configurations. It is engineered to be combined with two Siemens SKP series electro-hydraulic actuators to perform multiple functions, such as safety shut-off, gas pressure regulation, or air-gas ratio control.

Features

• Double-valve body consists of two safety shut-off valves in series for redundant safety
• Patented double-seat construction with individual closing springs for reliable shut-off and high flow
• Integrated stainless steel mesh strainer at the inlet protects internal components from debris
• Inverted mounting plates for the pressure switch and pilot gas plate to accommodate specific installation requirements
• Normally closed operation ensures the valve remains shut when power is interrupted to the actuators
• Compact design reduces the overall size and weight of the gas train

Specifications

• Model: VGD40.125L
• Nominal Size: DN125 (5 inch)
• Connection: DN flanged
• Flow Rate: Approximately 630 m3/h air (at Δp = 10 mbar)
• Maximum Operating Pressure: Varies by application, typically up to 700 mbar (10 psi)
• Media: Suitable for gas families I, II, III (Natural gas, Propane, etc.) and air
• Housing Material: Die-cast aluminum
• Protection Class: IP65 when used with appropriate actuators
• Approvals: CE approved, UL listed, FM approved, and CSA certified

Applications

• Supervision of gas-fired combustion plants and forced draft burners
• Industrial furnaces and high-capacity boiler systems
• Used as a safety shut-off valve when combined with SKP15 actuators
• Used as a control valve with shut-off feature when combined with SKP25, SKP55, or SKP75 actuators
• Suitable for applications requiring inverted mounting of accessories due to spatial constraints within the burner housing