The inspection frequency should be strengthened to check whether the packing leaks

During the maintenance of the control valve, focus on eliminating burrs and scars on the valve stem and stuffing box, blinding the valve stem, improving the smoothness of the valve stem, and avoiding moving parts from scratching the packing seal Surface and cause leakage. It is still necessary to continue to analyze and explore in future practice. , Use a pressing tool to compress each circle installed to make the packing uniformly stressed, and the number of packing circles is subject to no exposure.

In the initial stage of use of new valves or valves that have just replaced the packing, the inspection frequency should be strengthened to check whether the packing leaks. For packing leakage in special occasions and environments, consider changing the control method of the valve, such as adopting special processing methods on the valve stem to improve sealing; the straight-stroke control valve is changed to the quarter-stroke control valve, because the quarter-stroke gate valve is adjusting In the process, the packing and the valve stem only produce axial displacement, and the damage to the packing is relatively small.. Generally, it can be adapted to most occasions.

PTFE coated fiberglass fabric Manufacturers Improve the smoothness of the valve stem as much as possible. When installing the packing, the previous circle of packing and the next circle of packing should be staggered up and down by 90% as required. . Summary In actual field applications, there are many reasons for regulating valve leakage. As long as we are diligent in observation and analysis, and eliminate the causes of leakage one by one, the problem of regulating valve packing leakage can basically be eliminated; but we should also look at it.

The PTFE V-type packing should be fastened in place after replacement, and the packing gland should be evenly tightened, without skew imagination; other types of packing do not need to be pressed too tightly to avoid leakage. Under normal circumstances, tetrafluorocarbon materials should be the first choice if the conditions are met, and graphite or mixed materials should be considered next. If there is a leak, deal with it in time to prevent the leakage from expanding. Or 120. However, the reasons for packing leakage of some regulating valves are more complicated, and there are many factors that cause leakage. Measures to prevent packing leakage Select suitable packing for the application of the regulating valve