Gas Trains

A gas train is part of a combustion system immediately before a burner, and used to heat a boiler, dryer, oven, or other fuel-fired process equipment. The gas train is important because it includes all the components to allow for safe gas flow to the burner. Common components in a gas train include:

• Safety shutoff valve
• Manual shutoff valve
• Gas Pressure Regulator
• Low Pressure Switch
• High Pressure Switch

• Pressurized Gauges
• Solenoid Valves
• Test Valves
• Valve Proving System
• Combustion Air Flow Switch

Horizon Performance Technologies LLC (Horizon) builds all of our gas trains. The first step for building our gas trains is selecting the burner. Several factors go into selecting the burner such as operating temperature, product material weight and heat requirements, heat loss, and the duration the product is in the equipment. From there, we can select the correct components in the gas train to match the burner and meet the equipment safety requirements.



Horizon’s gas trains offer quality standard components from top manufacturers. Some of the manufacturers we use in our gas trains are: Honeywell, Karl Dungs, Kromschroder, Dwyer, Maxitrol, Hoffman, and Dongan.

Horizon mounts the gas train directly to the equipment immediately adjacent to the blower. This allows easier maintenance and trouble-shooting of the burner.

Gas Train Construction and Features:

• Piping to a single point gas connection.
• Pre-wired junction boxes for control of the gas train. These junction boxes are helpful because it eliminates the need to run wires to each component on the gas train.
• Manual shut-off valves. They are typically lockable 90° rotational ball valves that are used to shut off the gas supply.
• High pressure switch to indicate when gas pressure is too high. It acts as a failsafe if the regulator fails. Can come in automatic or manual reset.
• Gas pressure regulator is used to reduce the high gas pressure to a more usable level.
• Low pressure switch to indicate when gas pressure is too low. Can come in automatic or manual reset.
• Inlet strainer is used before the drain leg to prevent any harm to the pilot line components.
• Drain leg is used to catch any metal shavings or gunk from the gas supply that could cause harm to any of the gas train components.
• Automatic safety shut-off valves with single proof of closure to automatically halt the supply of gas when there is a fault in the burner or gas train.
• Precision modulating gas control valve is used to adjust the gas supply to raise or lower the temperature of the burner as indicated by the temperature controller.
• Air flow switch to monitor air flow combustion.
• Ignition transformer to provide ignition to the burner through high-voltage spark.
• Pressure gaugesto measure and display the incoming gas pressure.
• Flame safeguard is used to ensure the burner is operating safely. The flame safety relay consistenly monitors the gas train components to provide safe operation.

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