Material Analysis
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PSU Ring-type Check Valve Wear
Problem Phenomenon
In PSU production, metering instability and melt backflow occur; product weight fluctuates; check valve wear was confirmed by inspection.
Cause Analysis
Ring-type check valves are recommended as more suitable for PSU processing; high-viscosity melt causes great wear on the check valve; after wear, sealing fails and metering becomes inaccurate; abrasive wear and high-temperature aging superimpose.
Solution
①Select ring-type check valve configuration; ②Regularly inspect check valve sealing condition; ③Replace promptly when wear exceeds limits; ④Include metering stability in routine inspection.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU check valve selection has clear recommendations; wear inspection is included in preventive maintenance; metering stability directly reflects valve condition.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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