SKF
Hydraulic Seals Overview
This overview introduces SKF’s hydraulic seal product range, covering the primary seal types and their function within a hydraulic cylinder. It explains the role of piston seals (dynamic pressure sealing on the cylinder bore), rod seals (preventing leakage along the cylinder rod), wiper seals (cleaning the rod and excluding contaminants), guide rings (bearing side loads), and static O-rings/back-up rings. The overview provides a visual map of a typical cylinder cross-section with SKF seals installed and highlights the importance of system-level compatibility. It connects the product families to the selection guides and technical data needed to specify the correct seals for standard and custom cylinder designs. This is the entry point for design engineers and MRO teams seeking a comprehensive sealing solution from a single global supplier.
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Complete Cylinder Seal Set Mapping
Piston, rod, wiper, and guide positions shown in cross‑section.
Pressure‑Rated Seals
From low‑pressure pneumatic to 700 bar hydraulic in one overview.
Material Families
Ecopur polyurethane, PTFE, NBR, FKM all introduced.
System‑Level Compatibility
Seals designed to work together for optimum cylinder life.
Mobile and Industrial Focus
Solutions for excavators, presses, injection moulding, and marine.
Global Availability
Standard sizes in stock; custom made via SEAL JET.
Why a Matched Seal Set Outperforms Mixed Brands
A piston seal from one supplier may not be chemically compatible with the rod seal from another when exposed to the same hydraulic fluid. SKF’s overview promotes the system approach where all seals are validated together, ensuring no cross‑material degradation and consistent friction performance across the full cylinder stroke.
The Hydraulic Cylinder as a Sealing System
The overview treats the cylinder not as a collection of individual seals, but as a system where each seal influences the others. The wiper must not remove the lubricating film that the rod seal needs. SKF’s system‑design methodology balances these interactions, resulting in a cylinder that is dry externally and leak‑free internally.