Processing Machinery
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PEI Check Valve and Clearance
Problem Phenomenon
PEI metering is unstable with melt backflow; the check valve type and screw clearance are improperly configured, and product weight fluctuates.
Cause Analysis
The PEI check valve should be of the sliding check ring type; the flow clearance in the screw metering zone should account for at least 80% of the cross-section of the flow area; improper configuration causes metering inaccuracy; high-viscosity melt has high sealing requirements.
Solution
①Select a sliding check ring type check valve; ②metering zone flow clearance ≥80% of the cross-section; ③regularly check check valve wear; ④perform metering stability spot checks.
Key Takeaway
PEI check valve selection has clear type requirements; 80% flow clearance is the design standard; wear checks ensure metering stability.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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