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Nov 26 2024
Comprehensive Introduction to Skeleton Oil Seals
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Proper installation direction is vital for oil seal performance and equipment reliability. This guide covers essential orientation principles, common errors, and step-by-step installation methods.
The sealing lip (inner lip) must always face the lubricant or sealed medium to prevent leakage.
Examples:
✔ Rotary shaft seals: Lip faces the lubricant side (equipment interior).
✔ Reciprocating seals: Lip faces hydraulic oil/grease side.
For spring-energized seals, the spring must align with the sealing lip (toward the medium side) to enhance sealing force.
Direction: Lip faces lubricant side.
Application: Single-direction sealing (rotary shafts).
Primary lip: Faces lubricant side (inner).
Secondary lip: Faces outward for dust protection.
⚠ Warning: Reversing primary/secondary lips causes leakage or contamination.
Dust lip: Always faces external environment.
Sealing lip: Faces lubricant side.
Consequence: Lip fails to contact shaft surface, causing leaks.
Example: Installing TC-type primary lip outward.
Consequence: Spring corrosion/breakage from environmental exposure.
Example: Reciprocating seal lip misaligned with piston movement.
Markings Check:
Confirm "IN"/"OUT" labels or directional arrows on seal housing.
Visual Lip Inspection:
Verify primary/secondary lip directions (critical for TC-type).
Spring Position:
Ensure spring aligns with sealing lip (medium side).
Clean Components:
Remove burrs, oil, and debris from shaft/bore.
Apply Lubricant:
Coat sealing lip and shaft with grease to reduce friction.
Use Dedicated Tools:
Press seal evenly into bore using arbor press or guide sleeve.
Post-Installation Check:
Confirm no lip rolling, misalignment, or directional errors.
Align lip direction with rotation to counteract centrifugal forces.
Use double-lip seals with primary lip facing high-pressure side.
Select heat-resistant (e.g., FKM) or chemical-resistant materials while maintaining standard orientation rules.
Need Professionally Engineered Oil Seals and Seal Kits?
Guangzhou Jiarui Seals Co., Ltd. provides:
✅ Direction-specific seals for rotary/reciprocating systems
✅ Custom materials (NBR, FKM, PTFE)
✅ Multiple standard seal kits (support OEM ODM)
✅ Technical support for critical installations
