Natural gas stove inhalation valve to the inside is how it all about?

gas stove valves should be flame protection problems,
First, try to change two batteries, battery power is low can cause suction and

Gas Control Valve

is not maintained, there will be what you said.
Second, adjusting the throttle, to make the middle of the fire burning fire tray flame protection to the needle for the job (that is, the middle of which a non-ignition of the needle)
Third, check the needle flame protection following cable is loose or fall off.