It is possible to determine the on/off status of the cut-off valve
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As shown in the diagram, can it be determined from the site whether the cut-off valve of the device is open or closed? Could you explain the reasons for the judgment? Thank you
Your instrumentation engineers must know this
Based on your specifications, it should be a cut-off valve with a 90° switch; generally, this is a ball valve. Currently, it is stuck in the position at the lowest point in the counterclockwise direction, allowing the valve to rotate only in a clockwise direction. Given that the valve closes when rotated clockwise and opens when rotated counterclockwise, it is currently in the open state.
Generally, such valves come equipped with an indicator dial on site, indicating open and closed positions. If there is no sound transmitted through the pipes, or if it’s not possible to determine the situation based on flow rate, liquid level, or pressure, then follow the rule of turning it off clockwise and turning it on counterclockwise. I see that there is a feedback switch there; it’s possible to compare this with the control room data to verify things.
Check whether the valve label indicates FO or FC, then verify if the solenoid valve is energized; it will be a bit warm if it is. If there is no severe leakage in the gas supply line at the site, it is possible to determine whether the valve is open or closed. I’m interested in how these air circuit accessories on the valve control it; are the latter two air source amplifiers a form of double safety mechanism? This hand valve is a balance valve (closed? ）?
When the indications are unclear, have a specialist in instrumentation check the status of the solenoid valve, and then determine whether the valve operates in FO or FC mode; this will allow determination of the valve’s on/off state.
Aren’t those two proximity switches? Just make a mark; that way, you’ll know whether the valve is open or closed when you’re on site next time
. This is an actuator; to directly determine the position of the valve switch in this state, one needs to check the position of the valve stem at the connection point with the valve； Its status can be inferred from other information. All the suggestions upstairs are correct.
It can also be determined using process parameter values