Automatic valve issue?
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This post was last edited by zyzs on 2011-10-27 at 11:59. There is a air shut-off valve: setting it to 100 closes it completely, but setting it to 0 doesn’t allow it to reach full open position? What is the reason?
The most likely explanations are a slightly high zero point, or a too short travel distance of the locator.
If the air supply signal is guaranteed, most pneumatic control valves can achieve this goal; all that is needed is to adjust the positioner
For a gas shut-off valve, the ability to close it completely indicates that the pressure of the gas supply is sufficient. If it cannot be opened fully, the most likely reason is that the travel distance hasn’t been set properly; the positioner needs to be adjusted again.
OP, adjust the locator again!! Also check whether the pressure relief valve is damaged – the air supply pressure is too high! !
First, check whether the electrical signal at 0 is normal; if it is, then check whether the output air pressure of the locator matches the zero point. It might be that the zero point of the locator is set too high; adjust it again.
First, it’s necessary to check whether the signal sent to the locator is normal. Next, it’s required to verify if the locator is drifting and to inspect the condition of the air supply
Check of the locator and air supply pressure, whether the feedback rod is loose, whether the zero point is set correctly, whether the throttle valve is too large, and whether the distance between the nozzles is too great