I hope the experts here can help! ! ! ! Two solenoids control a two-cylinder cut-off valve.
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How does this air circuit ensure that the valve closes in the event of a power loss?
Do the two solenoids go to the DCS one and to the SIS the other?
The picture isn’t detailed enough to draw a pneumatic circuit diagram. But the two three-way valves are definitely for self-protection purposes, remaining powered under normal operating conditions. The two five-way switches are used for normal sequential control.
Yes, I wondered how such a design could enable the SIS to be turned off. Can the site be shut down?
One goes to DCS and one goes to SIS. I don’t understand how it achieves turning off the SIS. Is this tee used for holding position?
Two solenoids are connected in series; the first one is connected to SIS, and the second one to DCS
The SIS is a two-position three-way valve. It can’t close the valve, right? We can only keep him in shape
Take a clear photo of where you’ve placed the three tubes of the two-way tee, so I can take another look