The PDF-type piston seal is a precision-engineered composite sealing element specifically designed for ultra-high pressure static applications. Unlike conventional seals, the PDF series combines a robust metal washer with a mechanically bonded elastomer to deliver exceptional sealing performance where ordinary seals would fail.
Composite Construction for Extreme Conditions
The PDF seal features a sophisticated design incorporating a metal washer with a precision-molded elastomeric sealing element. The elastomer is mechanically bonded to the metal through serrated interlocking, creating a permanent, inseparable bond that prevents shear damage even under prolonged compression at extreme pressures. This innovative construction ensures the seal maintains its integrity and sealing function throughout its service life.
Engineered for Static Excellence
Designed specifically for static face sealing and bolt head applications, the PDF seal excels where conventional elastomeric seals cannot survive:
Ultra-High Pressure Rating: Withstands pressures up to 1500 bar (21,750 psi) —far exceeding standard hydraulic sealing requirements
Extrusion-Proof Design: The integrated metal washer provides robust anti-extrusion protection, preventing elastomer deformation even under extreme pressure spikes
Thread-Friendly Installation: Can be installed over threads without damaging the sealing element, simplifying assembly in complex components
Advanced Material Options
The PDF series is available in multiple high-performance elastomers to suit diverse operating environments:
| Material | Temperature Range | Best For |
|---|---|---|
| NBR (Nitrile) | -30°C to +100°C | General hydraulic fluids, standard temperature applications |
| FKM (Fluorocarbon) | -20°C to +200°C | High-temperature environments, aggressive chemical media |
| HNBR (Hydrogenated Nitrile) | -20°C to +150°C | Enhanced mechanical properties, superior oil and chemical resistance |
Operating Parameters
| Parameter | Specification |
|---|---|
| Maximum Pressure | 1500 bar (ultra-high pressure) |
| Temperature Range | -30°C to +200°C (material dependent) |
| Media | Hydraulic fluids, industrial oils, chemicals |
| Application | Static sealing only (0 m/sec dynamic) |
| Installation | Under bolt heads, between flanges |
Key Performance Advantages
Extreme Pressure Capability: Engineered specifically for ultra-high hydraulic pressures up to 1500 bar—ideal for the most demanding industrial applications
Permanent Bond Integrity: Serrated interlocking between metal and elastomer ensures the seal remains intact even under extreme compression and pressure cycling
Superior Extrusion Resistance: The metal washer provides robust protection against elastomer extrusion into the gap, eliminating a common failure mode in high-pressure seals
Temperature Versatility: Multiple material options accommodate applications from -30°C cold environments to +200°C high-temperature conditions
Universal Media Compatibility: Available elastomers provide compatibility with a wide range of hydraulic fluids, industrial oils, and aggressive chemicals
Simplified Assembly: Can be installed over threads without damage, reducing assembly complexity and risk of seal damage
Installation Guidelines
Designed for installation under bolt heads or in static flange applications
Ensure proper bolt torque to achieve optimal sealing compression
The seal seats securely during installation—ideal for smooth bolt shank applications
Can be installed over threads without damaging the sealing element
Verify housing dimensions match manufacturer specifications for optimal performance
Standard Size Range
Available in a comprehensive range of metric and inch sizes with precisely specified dimensions:
| Inner Diameter | Outer Diameter | Height | Material | Typical Application |
|---|---|---|---|---|
| 7.77 mm | 13.49 mm | 1.27 mm | NBR | Small bolt sealing |
| 9.73 mm | 15.32 mm | 1.27 mm | FKM | High-temp hydraulic |
| 13.66 mm | 22.35 mm | 1.27 mm | HNBR | Enhanced durability |
| 18.8 mm | 33.58 mm | 1.63 mm | NBR | Medium bolt sealing |
| Custom sizes | Available | Upon request | Various | Special applications |
Typical Applications
Ultra-High Pressure Hydraulics: Extreme pressure components and assemblies requiring reliable static sealing
Flange Sealing: Static face sealing between bolted flanges in high-pressure circuits
Bolt Head Sealing: Critical sealing under bolt heads in hydraulic manifolds and components
Industrial Machinery: Heavy equipment requiring reliable static sealing at extreme pressures
Mobile Hydraulics: Construction and mining equipment operating in demanding conditions
Hydraulic Manifolds: Port sealing and component interface sealing
Test Equipment: High-pressure test stands and validation systems
The PDF Type Seal delivers metal-reinforced robustness with elastomeric precision—engineered specifically for ultra-high-pressure static applications where conventional seals cannot survive. Its permanent bond construction, extreme pressure capability, and versatile material options make it the preferred choice for engineers facing the most demanding static sealing challenges.
Original text from: pneumatic seal https://www.bszzseal.com/
