The working principle of the gas alarm solenoid valve. Which one is better, the gas alarm solenoid valve or the manipulator?

Gas alarm Working principle of solenoid valve

For residential use Gas alarms are generally installed in the kitchen. When the gas sensor encounters gas, the core gas sensor of the gas alarm is commonly known as the "electronic nose". The resistance of the sensor changes with the gas concentration, and an electrical signal is generated accordingly for the gas alarm. Post-stage line processing. After electronic circuit processing, it becomes a voltage signal that changes proportionally to the concentration. It is compensated by a linear circuit to linearize the signal. After microcomputer processing and logic analysis, various control signals are output. That is, when the gas concentration reaches the alarm set value, the gas The alarm emits audible and visual alarm signals and can display gas concentration or activate external intermodal equipment (such as exhaust fans, solenoid valves ). The detector's ability to sense gas leakage at the installation site is usually set to less than 25% of the lower explosion limit of various gases as the alarm concentration. Natural gas is 0.1%-1.0%, artificial gas is 0.1%-0.5%, and liquefied petroleum gas is 0.1 %-0.5%.

Which one is better, gas alarm solenoid valve or manipulator?

Nowadays, gas alarms have a gas cut-off function, which means that when a gas leak is detected, the gas will be cut off as soon as possible. There are two linkage options for cutting off the gas, one is the solenoid valve and the other is the manipulator. So which one is easier to use?

First of all, let’s talk about the installation position. The solenoid valve must be installed behind the gas meter and in front of the valve behind the meter. If there is an arrow on it, it must be installed in the direction of the arrow. If it is installed wrong, it will definitely not work. The advantage of the solenoid valve is that there is no closing process and the air will stop quickly.

As for the manipulator, it is usually installed on the valve behind the meter. This eliminates the need to cut the gas pipe behind the meter, which is usually a 4-cent galvanized iron pipe. There is no need for us to cut it, just install it directly next to the valve. The advantage is that there is no need to change the pipe. But the disadvantage is that if the seal is not tight enough, air leakage will still occur.

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