Hydraulic Seals
✔ Advanced Composite Materials
✔ Precision CNC Manufacturing
✔ OEM & Custom Hydraulic Sealing Solutions
Experienced Hydraulic Seal Manufacturer & Supplier
TYS is a leading manufacturer of hydraulic seals in China. We have over 25 years of experience in researching, developing, and producing hydraulic seals. We offer high-performance and high-quality hydraulic seals at competitive prices, including hundreds of modified PTFE, PU, and rubber seal materials.
We provide standard and customized hydraulic seals and support OEM. We offer various designs to meet the requirements of different working conditions.
Piston Seals
Designed to maintain sealing between the piston and cylinder bore, preventing fluid bypass under high pressure. Suitable for single-acting and double-acting systems.
Rod Seals
Installed in the gland to prevent fluid leakage along the reciprocating rod. Often paired with wiper seals for contamination control.
Rotary Seals
Used in applications combining rotation and pressure containment, requiring low friction and wear resistance.
Wiper Seals
Protect internal sealing components by preventing dirt, dust, and moisture from entering the hydraulic system.
High Grade Materials
In hydraulic systems, material selection is not a specification detail —It is the core factor determining the quality and performance of seals.
As experienced hydraulic seal manufacturers, we engineer our hyd seals using high grade PU, rubber, and reinforced PTFE compounds designed for high-load and high-speed applications. Our material system includes filled PTFE seals for ultra-low friction, carbon/bronze reinforced PTFE piston seals for wear resistance, high-stability PTFE rod seal structures for reciprocating motion, and precision-designed spring energized PTFE seals for demanding conditions.
For hydraulic cylinder seals, these compounds resist extrusion, heat buildup, chemical attack, and compression set. When selecting high pressure hydraulic seals, material stability under 30MPa+ working pressure is what truly protects system reliability and prevents costly downtime.
Material Selection for Hydraulic Seals
Selecting the correct sealing material determines pressure resistance, friction level, and durability.
| Material | Pressure Capability | Temperature Range | Wear Resistance | Typical Use |
|---|---|---|---|---|
| PTFE | Very High | -200°C to +260°C | Excellent | High-pressure, high-speed systems |
| PU | Medium to High | -30°C to +100°C | Very Good | Mobile hydraulics |
| NBR | Medium | -30°C to +120°C | Good | General industrial systems |
| FKM | Medium | -20°C to +200°C | Good | Elevated temperature applications |
PTFE compounds are widely used in demanding hydraulic environments due to their low friction coefficient and extrusion resistance under high pressure.
Precision Machining & Tolerance Control - That Ensures Sealing Integrity
Sealing performance in hydraulic systems depends not only on material but also on dimensional accuracy.
As an experienced hydraulic seals factory, we use advanced CNC-controlled turning and precision molding to ensure tight tolerances, smooth sealing lip geometry, and stable performance in demanding dynamic seal applications. Even minor deviations in lip angle or surface finish can increase friction, accelerate wear, and lead to premature failure.
Our production focuses on optimized dynamic seal design, controlled friction behavior, precision machining of hydraulic seals, and accurate sizing based on hydraulic seal size chart and metric standards. Every batch undergoes strict dimensional inspection to ensure reliability in dynamic shaft seal systems, high-cycle cylinders, and heavy-duty hydraulic rams.
When a hydraulic cylinder keeps blowing seals, dimensional inaccuracy is often the root cause. Precision manufacturing turns hydraulic seals from commodities into true high-performance components.
Why Hydraulic Systems Fail?—And How Does Proper Sealing Prevents It？
Under High Pressure
Improper seal geometry or material mismatch can lead to internal bypass leakage, pressure instability, and reduced system efficiency. High-pressure applications require precision tolerance control and extrusion resistance.
Premature Wear
Excessive friction increases heat, accelerates wear, and shortens seal lifespan. Advanced material selection and surface compatibility reduce friction while maintaining sealing integrity.
Thermal Deformation
Temperature fluctuations affect elastomer elasticity and hydraulic seal’s dimensional stability. Selecting the correct compound ensures performance under continuous or cyclic thermal loads.
What Are Hydraulic Seals and How Do They Work?
Hydraulic seals are critical components designed to retain pressurized fluid while preventing leakage between dynamic and static surfaces in hydraulic systems. They operate by maintaining controlled contact pressure between the sealing element and the mating surface.
In hydraulic cylinders, piston seals isolate pressure zones, rod seals prevent external leakage, and wiper seals protect against contamination. Proper seal design balances:
- Contact stress distribution
Fluid pressure compensation
Surface finish compatibility
Thermal expansion behavior
The effectiveness of a hydraulic sealing system depends on material elasticity, wear resistance, extrusion resistance, and dimensional precision.
This is why seal selection must consider pressure range, operating temperature, stroke speed, and environmental exposure.
Our Hydraulic Seals Applications
TYS offers hydraulic seals with various designs, different materials and various production processes. The high-performance hydraulic seals of TYS can meet the unique challenges faced by various industrial sectors, such as sudden pressure increases, harsh environments and extreme temperatures.
Construction machinery and excavators
Mining equipment and heavy loaders
Agricultural machinery and mobile hydraulics
Oil & gas hydraulic control systems
Hydraulic press
Material Handling
FAQ
1️⃣ How do you select hydraulic seals for high-pressure systems?
Selecting hydraulic seals for high-pressure applications requires evaluating multiple technical parameters beyond basic size matching.
First, determine the maximum operating pressure and whether pressure spikes or shock loads occur. Applications above 25 MPa (3,600 psi) typically require seals with high extrusion resistance and proper backup ring support.
Second, analyze clearance gaps between piston and bore or rod and gland. Excessive clearance increases extrusion risk under pressure.
Third, consider:
Stroke speed (m/s)
Surface roughness (Ra value)
Fluid type and viscosity
Temperature range
Installation space constraints
For high-pressure hydraulic cylinders, PTFE-based piston seals combined with elastomer energizers are commonly selected due to their low friction and dimensional stability. In extreme pressure conditions, adding anti-extrusion rings is critical to prevent material deformation.
Hydraulic seal selection should always balance pressure resistance, friction level, wear behavior, and system efficiency.
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1️⃣ How do you select hydraulic seals for high-pressure systems?
Selecting hydraulic seals for high-pressure applications requires evaluating multiple technical parameters beyond basic size matching.
First, determine the maximum operating pressure and whether pressure spikes or shock loads occur. Applications above 25 MPa (3,600 psi) typically require seals with high extrusion resistance and proper backup ring support.
Second, analyze clearance gaps between piston and bore or rod and gland. Excessive clearance increases extrusion risk under pressure.
Third, consider:
Stroke speed (m/s)
Surface roughness (Ra value)
Fluid type and viscosity
Temperature range
Installation space constraints
For high-pressure hydraulic cylinders, PTFE-based piston seals combined with elastomer energizers are commonly selected due to their low friction and dimensional stability. In extreme pressure conditions, adding anti-extrusion rings is critical to prevent material deformation.
Hydraulic seal selection should always balance pressure resistance, friction level, wear behavior, and system efficiency.
2️⃣ What material is best for high-pressure hydraulic cylinders?
There is no universal “best” material — the correct compound depends on operating conditions.
For continuous high-pressure systems (above 20–30 MPa), filled PTFE compounds are widely used due to:
Low friction coefficient
High extrusion resistance
Chemical stability
Dimensional consistency under load
In mobile hydraulics with moderate pressure and heavy shock loads, polyurethane (PU) may offer better resilience and impact resistance.
For high-temperature environments above 150°C, FKM compounds provide improved thermal stability, although friction characteristics differ from PTFE.
Material selection should be based on pressure, temperature, motion type, and expected service life.
3️⃣ How long do hydraulic seals last in real operating conditions?
Hydraulic seal lifespan cannot be defined only in time — it is typically measured in operating cycles or stroke distance.
In properly designed systems:
PTFE piston seals in industrial cylinders can exceed 5–10 million cycles under stable pressure.
PU seals in mobile equipment may experience shorter lifespans due to contamination and shock loading.
Seal longevity depends on:
Fluid cleanliness (ISO 4406 cleanliness class)
Rod surface finish (Ra 0.2–0.4 μm recommended)
Alignment and installation accuracy
Pressure fluctuation frequency
Temperature stability
Contaminated fluid or improper installation can reduce seal life by more than 50%, regardless of material quality.
Regular inspection and proper filtration significantly extend service life.
4️⃣ What causes seal extrusion and how can it be prevented?
Seal extrusion occurs when high hydraulic pressure forces the sealing material into clearance gaps between metal components.
This typically happens when:
Pressure exceeds material capability
Clearance gaps are too large
Temperature softens elastomer compounds
Backup rings are not installed
To prevent extrusion:
Minimize radial clearance
Use anti-extrusion rings
Select high-modulus PTFE compounds
Ensure correct gland design
Extrusion damage often appears as nibbling or torn edges on the seal profile.
Proper engineering design eliminates most extrusion failures before installation.
5️⃣ Can hydraulic seals handle extreme temperatures?
Yes, but performance depends entirely on material formulation.
PTFE compounds can operate from -200°C to +260°C, maintaining dimensional stability even under pressure.
Elastomer-based seals such as NBR typically perform between -30°C and +120°C, while FKM extends high-temperature capability to approximately +200°C.
However, temperature fluctuations combined with pressure cycling accelerate material fatigue. Thermal expansion must also be considered in gland design to avoid excessive compression or loss of sealing force.
Material selection should always account for both continuous temperature and peak exposure conditions.