Processing Machinery
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PA66 valve body sealing
Problem Phenomenon
PA66 valve body sealing surface leaks after long-term pressure
Cause Analysis
Sealing surface creep relaxes the pressing force, and medium temperature accelerates the creep process; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry materials and should be confirmed first during troubleshooting
Solution
Design metal valve seat for the sealing surface; use disc springs on bolted connections to compensate relaxation; verify by pressure-temperature life test; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Pressure-bearing sealing requires metallized fit plus elastic compensation; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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