33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
33-99No. Mufu E Rd. Gulou District, Nanjing, China [email protected] | [email protected]
一．Core Advantages
1. Superior Anti-Extrusion: The stepped shoulder acts like a "bridge pier," locking into the clearance gap, enabling it to withstand ultra-high pressures exceeding 70 MPa.
2. Near-Zero Leakage: It features continuous self-compensation after wear, delivering exceptional pressure-holding and sealing performance.
3. Smooth Operation: Low breakout friction and low running friction eliminate hydraulic cylinder low-speed "stick-slip" or "judder" completely.
4. Robust and Durable: Constructed from high-strength materials like polyurethane, offering excellent wear resistance and long service life.
5. Compact and Efficient: A single element provides bi-directional sealing, saving valuable space on the piston.
二．Primary Application Areas
1.Heavy-Duty Construction & Mining Machinery: Core cylinders (subjected to massive shock loads) in large excavators, mining dump trucks.
2.Metallurgical Equipment: AGC (Automatic Gauge Control) cylinders in rolling mills (requiring zero leakage and micron-level precision control).
3.High-End Industrial Machinery: Clamping cylinders in large injection molding machines, main cylinders in precision presses (requiring high-pressure holding).
4.Energy & Marine: Steering gear cylinders on ships, hydraulic cylinders for hydropower gate control (critical for safety and long-term reliability).
5. Precision Testing Equipment: Actuator cylinders in material testing machines (requiring precise force control without interference)
Comparison Dimension |
Step Labyrinth Seal |
Straight-Through Labyrinth Seal |
Hole-Pattern Damper Seal (PDS) |
Leakage Suppression |
Superior to straight labyrinth (leakage 17.9% lower) |
Poorer |
More effective (25% lower leakage than labyrinth seals in pure gas conditions) |
Assembly Suitability |
Excellent (stepped shaft design) |
Average |
— |
Stability / Rotordynamic Risk |
Superior to straight labyrinth (less sensitive to pre-swirl) |
Poorer |
Potential subsynchronous vibration in wet gas conditions |
Damping Characteristics |
Superior to straight labyrinth |
Poorer |
Significantly better (higher direct damping coefficient) |
Improvement Potential |
Adding protrusions can reduce leakage by another 30% |
— |
— |
Welcome to HOVOO, a Chinese seal factory. Production of PU, Rubber and PTFE seals. The seals include O-ring, piston seal, rod seal, Gray ring and gas seal.
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