Commercial gas stoves use two different types of ignition sources, standing pilot and electronic ignition modules. Cooking stoves with standing pilots continuously burn gas with a flame (called a pilot light) contained within the stove. The standing pilot flame is usually located somewhere along the burner tubes to ignite or re-ignite the gas.
The gas valve that is typically used with a standing pilot J999MDA or other J series is a BASO H15 safety shut-off valve. The H15 gas valve provides a thermal electric device when used with a thermocouple K15 or K19 series attached to the standing pilot monitors the pilot flame. As long as the flame is present at the standing pilot the thermocouple will send a electrical charge to the H15 safety shut-off valve keeping the valve open allowing gas to flow to the main burner tubes and pilot. Once the flame is lost the H15 will shut down stopping the flow of gas to the main burners. The stove will then need to be re-ignited at the standing pilot. One advantage to this system is the use of the thermocouple replaces the need for electricity. In some countries where rolling brown outs occur, the standing pilot, thermocouple with an H15 device will continue unaffected.
Newer commercial cooking stoves have been re-designed to use electricity through a device called an ignition module BG1100M series which uses a direct sparking device to spark ignite the burner tubes or an intermittent ignition module BG1600M series that uses a spark to ignite and standing pilot to sense the flame. The direct spark electronic module uses a single solenoid BGA158, BGA171, BGA110 series and a two prong igniter to create a spark to the ground rod igniting the gas and the burner. This would be considered an integral sense set-up because the sparking rod is also the sensing rod. The direct spark module also has a remote feature that allows you to spark with a two rod igniter and flame sense with a separate flame sense rod. Either one is used based on the OEM specifications.
The intermittent electronic module uses redundant valve safety BGD258 or BGD278 series where code requires dual solenoid safety for the main gas flow to the burner tubes. In either direst spark or intermittent, both electronic modules monitor the flame to determine if there is flame present to keep the valves open or shut the system down if the flame is lost protecting the stove from gas leaking.
J series Pilot