Emergency shut-off valve, also known as safety shut-off valve. It is a new type of safety supporting device for gas pipeline engineering, mainly used in the following situations: 1. It is connected with combustible gas leakage monitoring instruments. When the instrument detects a combustible gas leakage, it automatically and quickly closes the main gas supply valve, cuts off the supply of gas, and timely stops the occurrence of malignant accidents. 2. Connected to the extreme temperature (pressure) safety controller of the thermal equipment, when the temperature (pressure) at the detection point inside the equipment exceeds the set limit value, the gas supply valve will automatically and quickly close, stopping the supply of fuel. 3. Connected to the central fire alarm system of high-rise buildings, it automatically cuts off the gas supply inside the building in case of a fire, preventing gas explosions. 4. ZCR gas emergency shut-off valves are installed in the gas supply network of cities or factories, which can be centrally controlled in the central control room and remotely controlled to urgently shut down the pipeline gas supply at the accident site.
　　
The technical performance, low load loss, and high reliability of emergency shut-off valves. Suitable for combustible gases such as coal gas, natural gas, and liquefied petroleum gas, widely used in gas supply pipeline systems, gas thermal energy factory workshops, gas boiler rooms, and residential safety facilities. Valve function and working principle: The gas emergency shut-off valve is a normally open pulse triggered solenoid valve with accident self-locking and manual reset functions.
　　
　　Working principle of emergency shut-off valve:
　　
1. The valve is in a normally open state during daily operation, and the solenoid valve coil is in a power-off state, without consuming electrical energy.
　　
2. When an accident occurs, the valve coil is instantly energized, triggering the valve to quickly close and enter a self-locking state. At this point, even if the power is removed, the valve remains in a self-locking state and will not automatically reopen.
　　
3. The valve adopts a pilot valve disc, which is easy to open even when the pressure reaches 6 bar. The diameter is larger than DN125, and a lever handle is used to make the valve easy and fast to open and close.
　　
4. After the staff have dealt with the accident, the valve will be manually reopened to restore gas supply. Note: According to customer requirements, normally closed emergency shut-off valves can also be provided for power-off closure.