Solenoid Valve Operating Principle:
Automatic Gas Shut-off Valve (Solenoid Valve)
These are electric gas shut-off valves commonly known as solenoid valves. However, as part of the gas safety system, it is recommended for this solenoid valve used in gas path fittings to be manually resettable, unlike the valve used in gas route fittings.

These types of valves shut off the gas when they receive the closing signal from the central panel, and even if they receive the opening signal from the central panel, they do not allow gas to pass until manually reset (pressed down or pulled up, depending on the selected model). This ensures the detection of the cause of the gas leak by the user, the repair of the cause, and only then allowing gas to pass. The goal is to make it imperative to detect and repair the cause of the gas leak and only allow gas to pass under this condition.

Manual valves, like other solenoid valves, are of two types: "Normally Open" or "Normally Closed." A valve called "Normally Open" allows gas to pass as long as no supply voltage is applied to the coil. When it wants to cut off the gas, the coil is energized by supplying voltage from the relay output of the alarm system coded as NA or NO, making the circuit open, and the gas is cut off. Although these types of valves may seem advantageous in terms of the coil's life because they do not maintain a continuous supply voltage on the coil and are only energized in the event of an alarm, they may have a disadvantage that can be considered unsafe in some applications where it is not safe to shut off the gas in the event of a power outage. For example, in applications such as a boiler room where the combustion process is automatically stopped in the event of a power outage, especially considering that there may be some potential malfunctions in the combustion system when the power is cut off and restored, the fact that the gas valve remains open, allowing gas to flow to the boiler room-burner, can be considered an increased risk factor. Therefore, the use of a NORMALLY CLOSED valve in gas burning systems that can operate entirely dependent on electricity, such as the boiler room, and the use of a NORMALLY OPEN valve in gas burning systems that can operate without relying on electricity, such as the kitchen, is technically the correct approach. However, as a reality in our country, frequent power outages and the need to manually reset every time the power goes out have led users to prefer normally open valves for all applications instead of normally closed valves.

Simple Pilot Control Solenoid Valve
Solenoid valves are the most widely used control units for fluids. They have various types such as vacuum solenoid valve, stainless solenoid valve, solenoid valve for hot steam, solenoid valve for acidic water, electric motorized solenoid valve, double solenoid valves, etc.