Regulating valve issues
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Does anyone know the working principle of gas open valves and gas close valves?
When no signal (electrical or pneumatic) is applied, the valve remains in a closed state; such a valve is considered a normally closed valve, that is, a pneumatically open valve. The opposite is true
Pneumatic valves are divided into two types: piston-type and diaphragm-type. The working principles of the on-air valve and off-air valve you mentioned differ based on the working principles of these structures. But one thing is the same: the air supply valve: FC – it closes in the event of a power outage. It requires compressed air to open, and the valve closes when the air supply is cut off. Air shut-off valve: FO – Opens in the event of a power outage. Compressed air is required to close it; the valve opens when the air supply is cut off.
An air-on valve opens when there is air flow and closes completely when there is no air flow; the opposite is true for an air-off valve
Gas on: Gas supplied / Power turned on (off when no gas is present); Gas off: Gas not supplied / Power turned off (on when no gas is present): lol
Thank you to the original poster for the advice. Suddenly everything becomes clear