Traditional Culture Encyclopedia - The 24 Solar Terms - In DCS system, when the valve is opened to 80% and then gives a signal of 0%, the valve is not closed normally, but closed when it reaches 100%. Is this a normal phenomenon?
In DCS system, when the valve is opened to 80% and then gives a signal of 0%, the valve is not closed normally, but closed when it reaches 100%. Is this a normal phenomenon?
Valve inspection
1. Check the pneumatic pressure.
2. When the pressure is sufficient, respectively display10% 25% 50% 75%100% 0% to check the valve action.
3. If the openings are just the same, it is normal; Otherwise, if the opening is opposite, it means reaction. Just change the control algorithm and use 100.
4. If the opening is uncertain, it may be a problem with the pneumatic actuator.
5. When the opening is uncertain, use the signal generator to directly display the 4-20MA signal to see the action of the pneumatic valve (4, 8, 12, 20). If the opening is still uncertain, it is an actuator problem. If the opening is determined, it is a DCS system problem. Check the module passage and safety fence for damage.
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