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Polyurethane Head Seals for High Pressure Hydraulic Applications (HS)
Brand: Parker HannifinParker’s HS Profile is a viable alternative to conventional O-ring and back-up ring combinations for static sealing applications at high pressures.
The HS profile was developed for mobile equipment OEM’s as they continue to consider warranty costs and losses due to down time related to cylinder head glands.
Two of the most common seal failures on cylinder heads are O-ring back-up blow-out and pinched back-ups.
Both failures are common in systems with high eccentricities or large extrusion gaps.
The robust one-piece symmetrical seal geometry of the HS Profile features dual high-concentration contact points for increased sealing and stability.
Extrusion-resistant Parker polyurethane compounds not only simplifies installation but also enhances the sealing effect in pulsating pressure conditions. As a result, service life is significantly extended.
Features- Easy installation and elimination of worry over incorrect placement of an O-ring and back-ups which can become pinched, folded, or broken during installation
- Greater stability
- No twisting or rolling in the groove
- High extrusion resistant polyurethane materials
- Longer service life
Specifications
Brand
Color
- Green
Fluid Compatibility
- Petroleum-based Hydraulic Oil
Groove Width
- 0.208, 0.311
Length Unit of Measure
- inch
Maximum Pressure (psi)
- 10,000 psi (Static)
Maximum Working Temperature (°F)
- 200° F
Media
- Hydraulic
Minimum Working Temperature (°F)
- -65° F
Nominal Hardness
- 90A
Polymer Family
- TPU (Polyurethane)
Seal Material
- P4700A90
Thermal Application (°F)
- Low Temperature (< -30° F)
- Static sealing of hydraulic valves, cylinders, machine tools, injection molding machines and any static sealing point requiring radial sealing