Advantages: Excellent sealing performance, suitable for medium pressure (generally ≤10MPa), moderate cost, and easy installation.
Application Scenarios:
- Hydraulic pump shaft ends, hydraulic cylinder piston rod seals, distribution valve interfaces, etc.
Structure and Function:
- Composed of a polytetrafluoroethylene (PTFE) sliding ring combined with a rubber elastomer. The rubber provides elastic preload, while the PTFE sliding ring reduces friction and withstands high pressure.
- Role: Suitable for high-pressure (up to 30MPa or more) and high-speed conditions, offering both low friction and high tightness.
Characteristics:
- Advantages: High pressure resistance, wear resistance, low friction coefficient, and longer service life than ordinary lip seals.
- Disadvantages: Complex structure, higher cost, and strict installation precision requirements.
Application Scenarios:
- Heavy-duty hydraulic cylinders in large agricultural machinery (e.g., tractor suspension systems, harvester cutter lifting cylinders).
Structure and Function:
- Mostly made of polyurethane (PU) or rubber, installed on the outer side of the hydraulic cylinder end cap with the lip facing outward.
- Role: Specifically designed to scrape off sediment and debris from the piston rod surface, preventing contaminants from entering the hydraulic system.
Characteristics:
- Advantages: High hardness, strong wear resistance, and can be used alone or in conjunction with lip seals.
- Disadvantages: Only serves a dust-proof function without leak-proof capability.
