Polyurethane Head Seals for High Pressure Hydraulic Applications (HS) | Product Series

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Polyurethane Head Seals for High Pressure Hydraulic Applications (HS)

Polyurethane Head Seals for High Pressure Hydraulic Applications (HS)

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Parker's polyurethane head seals for high pressure hydraulic applications are an alternative to conventional O-ring and back-up ring combinations for static sealing applications at high pressures.

Technical Specifications

  • Groove Width: 0.208 inch, 0.311 inch
  • Minimum Operating Temperature: -65 °F
  • Maximum Operating Temperature: 200 °F
  • Maximum Operating Pressure: 10000 psi (static)
  • Seal Material: P4700A90
  • For Fluid Type: Hydraulic Oil (petroleum based)
  • Color: Green
  • Durometer: 90 Shore A
  • Thermal Application Type: Low Temperature (< -30°F)
  • Polymer Material Options: Thermoplastic Polyurethane (TPU, Resilon®, Ultrathan®)
  • Media: Hydraulic
  • Unit of Measure: Length: inch
Safety Warning

Full Product Description

AVAILABILITY
A sampling of Parker’s part numbers are shown in the configurator above for select materials and sizes. If the material and dimensions required are not shown, assistance with part number configuration may be found in the literature documents in the Product Support tab. To check current tooling, review the Part Number Look-up document. Contact Parker for requirements outside typical ranges.

PERFORMANCE ADVANTAGES
Parker’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 polyure¬thane compounds not only simplifies installation but also enhances the sealing effect in pulsating pressure conditions. As a result, service life is significantly extended.

Compared to conventional multi-piece O-ring and back-up combinations, the HS Profile offers the following advantages:
• 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

HS Profile part numbers correspond to dimensions and tolerances of standard AS568 O-ring sizes for single back-up O-ring groove widths.

Standard Materials:
• P4700A90 Polyurethane; Temp -65 / +200F; Pressure 10,000 psi static

Alternate Materials: For applications that may require an alternate material, please contact your Parker EPS representative.

Typical applications:
• Static sealing of hydraulic valves, cylinders, machine tools, injection molding machines and any static sealing point requiring radial sealing

Related Documents

Literature and Reference Materials
Fluid Power Seal Design Guide--EPS 5370
HS Profile Polyurethane Head Seal
Installation Techniques for Linear Fluid Power Seals
Parker Pradifa: HS Static Radial Seal
Part Number Look-Up
Training
Basic Sealing Technology-Linear Sealing
Sealing Technology Glossary of Basic Terminology
Contact & Support Information
Design Action Request--DAR
Frequently Asked Questions
Compliance, Certifications & Safety
EPS Division, SLC, IATF 16949:2016
EPS Division, SLC, ISO 9001:2015 and AS9100D in Accordance With AS9104/1
Seal Storage and Handling Guide - Linear Fluid Power Seals
Product Demos & Tutorials
EPS-Tech-Tip-HS-Profile
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Products Inside Diameter Outside Diameter O-Ring Dash Size
4700HS12-228 2.278 2.500 2-228
4700HS12-230 2.528 2.750 2-230
4700HS12-232 2.778 3.000 2-232
4700HS12-234 3.028 3.250 2-234
4700HS12-235 3.153 3.375 2-235
4700HS12-236 3.278 3.500 2-236
4700HS12-238 3.528 3.750 2-238
4700HS12-240 3.778 4.000 2-240
4700HS12-242 4.028 4.250 2-242
4700HS12-244 4.278 4.500 2-244
4700HS12-246 4.528 4.750 2-246
4700HS12-248 4.778 5.000 2-248
4700HS12-250 5.028 5.250 2-250
4700HS12-251 5.153 5.375 2-251
4700HS12-252 5.278 5.500 2-252
4700HS12-254 5.528 5.750 2-254
4700HS12-256 5.778 6.000 2-256
4700HS12-342 3.660 4.000 2-342
4700HS12-344 3.910 4.250 2-344
4700HS12-346 4.160 4.500 2-346
4700HS12-348 4.410 4.750 2-348
4700HS12-350 4.660 5.000 2-350
4700HS12-352 4.910 5.250 2-352
4700HS12-353 5.035 5.375 2-353
4700HS12-354 5.160 5.500 2-354
4700HS12-356 5.410 5.750 2-356
4700HS12-358 5.660 6.000 2-358
4700HS12-360 5.910 6.250 2-360
4300HS12-228 2-1/4 2-1/2 2-228
4700HS12-218 1-1/4 1-1/2 2-218
4700HS12-222 1-1/2 1-3/4 2-222
4700HS12-224 1-3/4 2 2-224
4700HS12-226 2 2-1/4 2-226
4700HS12-332 2-3/8 2-3/4 2-332
4700HS12-338 3-1/8 3-1/2 2-338
4700HS12-340 3-3/8 3-3/4 2-340
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