Extend the service life of the control valve
Thread Content
Four key points: First, the selection of control valves should be handled carefully in consideration of the manufacturing process, with efforts made to avoid mistakes in choosing basic parameters such as the material of the valve body and valve core, flow direction, flow characteristics, operating temperature, and mode of operation； Secondly, try to avoid high pressure differences before and after the control valve; this helps to prevent cavitation inside the valve and erosion of the valve core ； Third, try to avoid operating at low opening degrees; it is better to maintain a normal opening degree of 60-85%. Fourth, avoid oscillations in the control valve, especially those that occur at low opening degrees and under high pressure differences.
The key is to choose the type of control valve based on the properties of the material!
All four points mentioned above are correct, but how can we minimize the high pressure difference before and after the control valve? Because it is determined by the process parameters.
The 4 points provided by the original poster are only useful as a reference for manufacturers... but manufacturers know these things better than you do.....
By fulfilling these 4 points, along with regular maintenance, it is essential to lubricate the movable parts of the control valve, ensure proper coordination with the valve positioner, and maintain the sealing of the valve stem.