Does the pneumatic on/off valve F.C refer to a gas supply failure? Is it still a fault with the air source and the solenoid valve?
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For the F.C. valve, the valve together with the air supply solenoid valve opens even when there is no power supply – is this normal?
FC refers to a gas supply failure. For on-off valves equipped with solenoids, this generally refers to situations where there is a problem with the air supply or the solenoid loses power.
This is abnormal; could it be that the solenoid valve is installed backwards? It should be turned on when there is power; what’s the use of it otherwise?
This post was last edited by ylb913 on 2015-6-30 00:17. Two-way three-port solenoid valve, with three ports, one port on the output side； There are two ports on the input side; one is for air supply and the other is for venting. In the original poster’s case, the air intake and exhaust ports seem to be reversed; turning them around should fix it.
F.C. should stand for fault close – the valve should be in a closed state when power is cut off.
The valve should remain in a closed state in the case of two faults: power loss to the solenoid valve and loss of instrument air.
The air source – because some valves don’t have solenoid valves, but an emergency mode is required.
It refers to the valve with code F.C., which is related to air supply issues. If this valve, along with the air supply solenoid valve, opens without power being supplied, it means that the solenoid valve opens when there is no power supply; as a result, air gets in. Under normal circumstances, the solenoid valve opens when there is no power supply. In the event of a power outage or voltage fluctuations, as long as the air supply is functioning properly, the valve can still operate normally
First, is your valve a gas-open valve or a gas-close valve?
Is it just an ordinary pneumatic shut-off valve? Are you really sure the power isn’t on? 1. First, check whether this solenoid valve opens when powered and closes when power is cut off ； If it’s the opposite, then your current situation is correct. 2. As you mentioned, this valve is a fail-safe pneumatic shut-off valve; generally, a two-position three-way solenoid valve is used, with one port for air intake, one for air output, and one for exhaust. Did you connect the air supply to the outlet, and then connect the exhaust outlet to the valve? If that’s the case, your valve should not be able to be closed at this point. The air will remain trapped in the cylinder. 3. The solenoid valve is broken. 4. It’s a two-position five-way solenoid valve, right? You don’t know how to use it ? Haha..... (almost impossible) .....that’s it!