Synertech Stock
Piston seals PDE PD
The PDEPD piston ring is a seal for double-acting pneumatic pistons, featuring a special profile vulcanized onto a central steel plate. It is made of nitrile rubber compound (NBR) with a hardness of 70 Shore
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Multi-piece piston seals
The multi-piece piston seals for double-acting cylinders from the TPM, GDE, and PDE series represent the ultimate solution for high-efficiency hydraulic sealing in standard cylinders as well as medium to heavy-duty industrial applications.
Engineered as compact composite seals, they integrate the central dynamic elastomeric sealing element and the lateral guide/anti-extrusion rings into a single housing slot. This advanced structural design guarantees flawless hydrodynamic sealing, eliminating static and dynamic bypass leakage, while ensuring outstanding geometric stability against micro-misalignments, thereby eliminating metal-to-metal contact within the cylinder barrel.
| Profile | Description |
|---|---|
| TPM Standard Type | Compact 5-piece solution featuring an NBR central sealing ring, two polyester elastomer anti-extrusion back-up rings, and two POM guide rings. It represents the universal high-efficiency standard. |
| GDE / PDE Type | Compact 3 or 5-piece profiles engineered specifically for industrial hydraulics. They provide optimized axial dimensions and excellent radial pre-load capability to withstand pressure spikes and rapid thermal variations. |
| PDE PD Type | Geometric or material variant of the PDE series, optimized with high-performance compounds or reinforced guide inserts for systems operating under severe structural vibrations or high-frequency strokes. |
| Material / compound | Max speed | Temperature | Max pressure |
|---|---|---|---|
| NBR Nitrile Rubber 70/80 ShA + POM / Polyester elements | Up to 0.5 m/s | −30 / +110 °C | Up to 40 MPa 400 bar |
| FKM Premium On request + PTFE / POM elements | Up to 1.0 m/s | −20 / +200 °C | Up to 40 MPa 400 bar |
| Static Element / Energizer | Nitrile rubber profile with high elasticity and low compression set characteristics. |
| Anti-Extrusion Rings | Thermoplastic polyester or special high-hardness polyurethane for high mechanical resistance. |
| Integrated Guides | Filled polyacetal (POM) or phenolic resin engineered to withstand severe radial loads. |
Mineral oils, synthetic lubricants, water-based hydraulic fluids, water-glycol emulsions, and industrial greases.
Hydrodynamic Sealing Efficiency
The geometric profile of the central ring exerts a calibrated radial pressure that optimizes the oil film, eliminating leakage even under high pressures or dynamic load fluctuations.
Integrated Anti-Contact Guides
The lateral POM rings absorb radial service loads and micro-misalignments (run-out), preventing mutual metal-to-metal contact between the piston and the inner cylinder barrel.
Extrusion Resistance
The presence of rigid active back-up rings protects the seal from extruding into the mechanical clearances, even under maximum radial play and severe pressure spikes.
Manufactured in strict compliance with the dimensional specifications and tolerances outlined by international standards DIN ISO 6547 and ISO 6195.
| Standard TPM / PDE Type (NBR) | The premier choice for general engineering and standard aftermarket replacement in industrial cylinders. Optimized for traditional mineral oils at medium operating temperatures. |
| Premium GDE / PDE Type (FKM) | Specific configuration designed for high-speed systems, elevated temperatures, or chemically aggressive synthetic fluids, maintaining elastic properties and efficiency over time. |
| Manufacturer | Compact series (TPM / GDE) | Heavy Duty series (PDE / PDE PD) |
|---|---|---|
| Net Seals | TPM / GDE Series | PDE / PDE PD Series |
| Freudenberg (Simrit) | L43 Profile / SIMKO 300 | SIMKO 500 Profile |
| Parker Prädifa | BMP / C1 Profile | B3 / OE Profile |
| Dichtomatik | DBM Profile | DROP Profile |
| Kastas Sealing Tech. | K32 / K43 Profile | K33 / K38 Profile |
| Corteco | TPM Piston Seal Series | PDE Type HD Seal Series |