Gas Train

The purpose of the gas train is to safely and efficiently supply fuel at the correct pressures and flow rates to the burners. There are several variations of the gas train depending on what model and options are equipped on the machine. If the dryer is equipped for LPG fuel, there will be liquid lines sending LPG to the vaporizer and back to the manifold. CE equipped machines will have gas pressure switches to meet local codes. CGA equipped machines will have valve proving shut-off valves as well as liquid and vapor venting to meet local codes. Shown below are illustrations of two burner gas trains, for both LPG and Natural gas arrangements as well as for both domestic and CGA configurations. While your particular gas train may vary in size/design/arrangement, the components used are the same. Use these illustrations to familiarize yourself with the components that may be found on your particular dryer's gas train.

LPG Gas Train (Domestic)

Natural Gas Train (Domestic)

LPG Gas Train (CGA)

Natural Gas Train (CGA)

Control Valve

The Control Valve is a throttling butterfly valve that controls the fuel flow rate to the burner which is precisely positioned by the control valve actuator. The control valve is connected to the control valve actuator through a mechanical linkage.

Control Valve Actuator

The Control Valve Actuator is an electrical actuator that is connected to the control valve through a mechanical linkage that precisely positions it based on the output of the PLC. As the plenum temperature drops below the setpoint, the PLC commands the control valve actuator to open more, whereas if the plenum temperature rises above the setpoint, the PLC commands the control valve actuator to close more.

Strainer

The purpose of the Strainer is to collect any foreign material with a wire mesh filter that may find its way into the fuel supply line.

Solenoid Valve

The Solenoid Valve is to start and stop the flow of fuel to the burner. The opening/closing actuation of the solenoid valve is monitored and performed by the ignition board.

Pressure Relief Valve

The purpose of the Pressure Relief Valve is to automatically open and relieve excess pressure when the line pressure becomes too high. Once the pressure drops, the valve will close and seal again for continued proper operation.

Low / High Gas Pressure Switches (CE equipped machines only)

The Low / High Gas Pressure Switches are adjustable switches used to detect either low gas or high gas pressure in the gas train and shutdown the dryer. These switches are used for CE equipped machines to meet local codes.

Pressure Regulator

The Primary purpose of a Pressure Regulator is to continuously control the supply pressure of the fuel to the gas train manifold. There are various sizes and configuration based on model and configured options, however the primary purpose is the same.

Manual Hand Valve

The purpose of a Manual Hand Valve is to manually open and close various portion of the gas train for maintenance purposes.

Valve Proving Solenoid

The valve proving solenoid stops and starts the flow of fuel to the burner. The opening/ closing activation of the solenoid valve is monitored and performed by the ignition board. This solenoid detects proof of valve closure.