All factors that cause surging in control valves
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All factors that cause surging in control valves
There is air leakage in the outlet circuit of the locator; the locator supplies air, causing the control valve to surge； The pressure difference between the inlet and outlet of the control valve is greater than the designed value ； The medium pressure is a pulsating output, such as the control valve for the inlet path of a synthetic cycle machine ； Positioner surge causes the control valve to surge. Wait
1. Air leakage from the air supply results in insufficient thrust from the actuator; 2. The actual pressure difference is greater than the designed value, leading to insufficient thrust from the actuator. In short, the reason is insufficient thrust from the actuator
There are many factors associated with valve positioners that can cause such problems. One factor that is easily overlooked is an improperly secured feedback rod. An excessive pressure difference between the valve’s inlet and outlet, air leakage in the actuator, water entering the I/P converter, or poor flow in the throttle holes, as well as improper settings of the PID control parameters, and process control issues……
I would like to ask: What are the main factors that cause such problems with the ithlycyj valve positioner? One factor that is easily overlooked is an insecure fixation of the feedback rod. Why does an insecure fixation of the feedback rod lead to surging?； Please help me analyze the reasons behind this process.
My email is wjj19720117@163.com
Excessive sensitivity of the actuator, too much friction from packing, loose connections in the feedback rod, leaks in the diaphragm head or pipelines, insufficient output force from the actuator, actuator failures, inadequate air supply pressure, and so on. . . . However, specific issues need to be analyzed on a case-by-case basis; it’s not possible to generalize.
There are many factors that cause vibration in control valves, and it is difficult to determine when the designed pressure difference is lower than the actual one