VGD20.503A Siemens Gas Valve

Overview

The Siemens VGD20.503A is a high-capacity, compact double gas valve body designed for integration into gas trains. It consists of two safety shut-off valves in series, providing a critical safety function for gas-fired combustion plants. This modular valve body is engineered to work in conjunction with Siemens SKP series electro-hydraulic actuators to provide safety shut-off, gas pressure regulation, or air-gas ratio control. The VGD20.503A features a specific 1-inch BSP vent connection between the valves and is CE approved, making it suitable for industrial and commercial burner applications across various markets.

Features

• Double-valve design with two safety shut-off valves in a single compact body
• Integrated 1-inch BSP vent connection located between the two valve seats
• Built-in stainless steel mesh inlet filter to protect valve seats and downstream components
• Modular construction allows for easy mounting and replacement of actuators while the valve is under pressure
• Equipped with a universal mounting plate for the attachment of pressure switches or valve proving devices
• Internal threaded connections for easy integration into gas pipework
• Dual stem guides ensure precise disc alignment for reliable and tight shut-off

Specifications

• Model: VGD20.503A
• Pipe Size: 2 inch
• Connection Type: Threaded with 1 inch BSP vent
• Valve Class: Class A according to EN 161 (when used with SKP actuators)
• Maximum Operating Pressure: 150 kPa (1.5 bar)
• Static Pressure Rating: 150 kPa
• Volume between Valves: 0.8 liters
• Material: Aluminum AlSi10Mg
• Weight: Approximately 3.2 kg (7.05 lbs)
• Operating Temperature: -15 C to +60 C

Applications

• Integration into gas trains for gas-fired combustion plants
• Used with forced draft gas burners for safety shut-off and control
• Suitable for use with gas families I, II, and III, as well as air
• Ideal for commercial and industrial heating systems requiring high flow rates and reliable safety standards
• Compatible with Siemens SKP15, SKP25, SKP55, and SKP75 actuators for various regulation and safety configurations