The FSM-Type Piston Rod Seal is an integrated, low-friction sealing solution that combines primary sealing and contaminant exclusion into a single, compact unit. Featuring the innovative FSM (Friction-Synergized Multi-Lip) architecture, this seal is engineered to deliver zero-leakage performance while significantly reducing dynamic friction, efficiently scraping contaminants, and extending overall system service life.
Primary Sealing Lip: Incorporates a progressive pressure-compensating profile that ensures uniform contact stress distribution as pressure increases, preventing localized overloading.
Secondary Guiding Lip: Features micro-lubrication channels to maintain a stable lubricating film, minimizing breakaway and running friction (dynamic friction coefficient as low as 0.08-0.15).
Dual-Lip Synergy: The interaction between the primary and secondary lips creates a hydraulic pressure-balancing zone, effectively suppressing stick-slip phenomena.
Front Wiper Blade: Employs a multi-stage, progressive scraping profile (3-stage design with 25°/45°/70° angles) for efficient contaminant removal.
Contaminant Reservoir: A dedicated chamber temporarily stores scraped particles to prevent re-ingression into the system.
Self-Adjusting Elastomer: The wiper blade utilizes a variable-durometer composite material—a soft base for excellent rod conformity and a reinforced edge for effective scraping.
Heat-Dissipating Fin Structure: Micro-channels integrated into the seal’s back facilitate efficient heat transfer away from the sealing zone.
Dual Anti-Extrusion System: Combines a one-piece anti-extrusion ring with zoned reinforcement, capable of withstanding gaps up to 0.4mm.
| Code | Base Material | Temperature Range | Key Characteristics |
|---|---|---|---|
| FSM-HPU | High-Performance Polyurethane | -40°C to +110°C | Excellent abrasion resistance, general-purpose |
| FSM-XP | Engineered PTFE Compound | -60°C to +200°C | Ultra-low friction, superior chemical resistance |
| FSM-HNBR | Hydrogenated Nitrile Butadiene Rubber | -50°C to +150°C | Outstanding oil and fuel resistance |
| FSM-FKM | Fluorocarbon Elastomer | -20°C to +200°C | High-temperature and chemical resistance |
| Parameter | Range | Test Standard |
|---|---|---|
| Dynamic Pressure Range | 0 – 35 MPa | ISO 5597/1 |
| Static Pressure Range | 0 – 45 MPa | ISO 5597/1 |
| Operating Speed | ≤ 2.5 m/s | DIN 3761 |
| Friction Coefficient | 0.08 – 0.25 | ASTM D1894 |
| Leakage Rate | < 0.05 ml/h | ISO 7986 |
| Service Life (Travel) | > 5,000 km | Accelerated Life Testing |
High-Precision Servo-Hydraulic Systems with stringent friction stability requirements.
Frequent Start-Stop Cycles: Hydraulic cylinders in injection molding and die-casting machines.
Dusty/Contaminated Environments: Construction, mining, and agricultural equipment.
Extreme Temperature Applications: Arctic equipment, metallurgical machinery.
Long-Stroke Cylinders: Large-scale presses, ship steering gear.
Piston Rod Hardness: ≥ HRC 45
Surface Finish: Ra 0.1 – 0.4 µm
Straightness: ≤ 0.1 mm/m
Surface Treatment: Hard chrome plating (20-30 µm) or ceramic coating recommended.
Use a dedicated FSM installation tool (1:10 taper).
Lubricate the sealing lips with the system’s hydraulic fluid prior to installation.
Ensure the seal is not twisted or overstretched in the gland.
Perform a running-in period of 5-10 full, unloaded strokes after installation.
Requires FSM-specific gland dimensions (differs from standard Glyd-Ring® or Step Seal glands).
Groove Bottom Radius: R0.2 ± 0.05 mm
Lateral Clearance: 0.1 – 0.2 mm
Groove Surface Finish: Ra ≤ 1.6 µm
Compact Integrated Design: Combines sealing and wiping functions, reducing required installation space by up to 30%.
Intelligent Friction Management: Adapts contact pressure based on system conditions, reducing energy consumption by 15-25%.
Environmental Robustness: Specialty compounds maintain elastomeric properties across extreme temperatures.
Extended Service Life: Optimized stress distribution delivers over 50% longer service life compared to conventional rod seals.
The FSM (Friction-Synergized Multi-Lip) technology is our proprietary sealing architecture. Its core principle is achieving the optimal balance between friction performance and sealing effectiveness across diverse operating conditions through synergistic multi-lip interaction and specialized geometrical design. This product is protected by multiple international patents (Pat. No.: FSM-PT2023-001 to 005). Comprehensive type test reports and service life predictions are available upon request.
Original source: Hydraulic seal https://www.bszzseal.com/
