Regulating valve is unstable
Thread Content
The individual regulating valves in my unit are always unable to stabilize on the same scale when in use. Instead, they jump up and down and cannot stabilize. What's going on? How to solve it? Thank you!
The following aspects should be considered: 1 Check whether there is vibration in the pipeline connected to the valve 2 Check whether the gas pipeline is leaking 3 Check whether the input and output of the valve positioner fluctuate 4 Valve friction is too large 5 Whether the air source pressure meets the requirements 6 Regulator parameters need to be re-adjusted
1. Whether the control signal received by the regulating valve fluctuates. 2. The output force of the actuator of the regulating valve is insufficient. 3. The locator is faulty, replace the locator.
Can I try setting the regulator to manual? If it is stable, it is due to changes in process conditions or improper PID parameter settings. ； If it is still unstable, there may be a problem. You can check the air source pressure, positioner and other faults. It's hard to draw a conclusion before using it manually.
5# nihaomaaa I seriously agree with this point of view! Turn on the manual control mode first. If there is no fluctuation, it means there is a process change or a problem with the adjustment system. For the latter, you can re-set the adjustment system by changing the PID parameters. ； If it still fluctuates, it is necessary to check whether the cause is the air source or the regulating valve.