Everyone, take a look at how to determine whether a valve is open or closed
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My unit is equipped with a control valve; it’s not clear whether it should be turned on or off on-site As shown in the figure, take a look – how can we tell whether it is on or off?
The last edit to this post was made by tiger2010 on 2020-5-25 at 21:26. Looking only at this one image, it seems that there is no keyway beneath the plastic piece with the crossmark; therefore, it’s not possible to determine whether the valve is open or closed； Following general rules, the current state in the image is on.
Check if there are slots at the connection points
This is a feedback valve; its on/off status should be displayed on your DCS or interlock screens!
This isn’t a control valve, right? I only see one solenoid valve and two position switches. It’s not possible to tell from the switch status; if you’re driving, it’s better to ask about the process (after all, they should know whether there’s fluid flowing in the pipes). Based on that feedback switch, I guess it’s in the off state.
It can be determined by combining two aspects: 1) check whether the process interlock is in the on or off state; 2) observe the direction of valve operation – 99% of valves close in the forward direction and open in the reverse direction
1. Check the nameplate. 2. Trace the origin to determine the location of the fault. 3. Turn the handwheel to operate the valve