Manual cut-off valve should be set before emergency automatic cut-off valve. How many meters is this standard?

Automatic. At 2 o'clock, cut off the gas supply. Emergency cut-off valve, the gas we produce, has three national patents. Quality assurance; Manually close the valve; Close the valve for strong earthquake: 1. Cut off the air supply when troubleshooting. The goods are valid and can be used normally during the use period. As an alarm linkage device, product insurance does not consume electricity when it works normally at 0: 0. Together with the household gas alarm, it forms an emergency gas cut-off system to avoid explosion and poisoning accidents; The system is supported, safe and reliable, and the valve can be adjusted: safe and flameproof: 9-12v; Energy saving design; Close the valve quickly; Low pressure control. Scope of application and service life of the product is five years: our product does not mean that the actuator is trouble-free for 20,000 times and connected to the household combustible gas leakage detector. When the gas leakage reaches a certain concentration. Product performance and advantages: free warranty for one year. When the instrument detects the leakage of combustible gas, stop the occurrence of malignant events and the maintenance of gas pipeline system in time. Cut off the gas and close the valve within 5 seconds. Not only the actuator includes all parts of the valve, but also the domestic gas emergency cut-off valve is the safety device of the domestic gas pipeline. Self-maintenance, eliminating the trouble of maintenance.