VGD20.503U Siemens Gas Valve

Overview

The Siemens VGD20.503U is a normally closed, 2-inch double-body gas valve designed for safety shut-off, gas pressure regulation, and air-gas ratio control. Engineered for use in commercial and industrial gas burner systems, this modular valve body is used in combination with Siemens SKP series electro-hydraulic actuators. Its compact design features two safety shut-off valves in series, providing a robust solution that reduces the overall size and weight of the gas train.

Features

• Modular double-valve body consisting of two safety shut-off valves in series
• Integrated stainless steel mesh inlet filter to protect valve seats and downstream components
• Dual stem guides to ensure precise disc alignment and tight shut-off
• Flat valve disc on the inlet valve for safety shut-off function
• Contoured valve disc on the outlet valve for stable pressure regulation
• 1-inch NPT vent connection located between the valves
• Multiple 1/4-inch NPT pressure taps for convenient testing and monitoring
• Compatible with AGF series threaded mounting flanges for easy installation and removal without pipe unions

Specifications

• Model: VGD20.503U
• Connection Size: 2-inch NPT (requires two AGF flanges for installation)
• Vent Connection: 1-inch NPT
• Maximum Operating Pressure: 10 to 20 psi (depending on application and agency listings)
• Maximum Back Pressure: 2 psi
• Permissible Operating Temperature: 14 F to 140 F (-10 C to 60 C)
• Approvals: UL listed, FM approved, CSA certified, and IRI approvable
• Body Material: Aluminum

Applications

• Industrial and commercial gas-fired combustion plants
• Gas trains for forced draft burners
• Safety shut-off control in combination with SKP15 actuators
• Pressure regulation and air-gas ratio control when paired with SKP25, SKP55, or SKP75 actuators
• Suitable for use with natural gas, propane, and other non-corrosive gas families