Total natural gas off only after cooking hobs bad valve does not close.

Total  natural gas valves off only after cooking hobs bad  does not close.
Because when the next total gas valves open when the switch is on the stove, there will be natural gas leak, very dangerous.
After each use of gas stoves, gas imports should turn off valve, then close the valve on the stove.
Suggest:
1, regular checks of gas appliances connected to gas pipeline and hose whether compressed, aging, the interface is loose, whether or rat chewed a sharp object, such as the occurrence of the above phenomenon should immediately contact the gas company.
2, regular replacement hose. According to the gas safety regulations and technical specifications, the hose should be replaced once every two years. Due to the quality of various different hose brand, for the user's own safety, it is recommended to replace the hose once a year, you should consciously do this.