{"id":1517,"date":"2026-05-11T17:22:36","date_gmt":"2026-05-11T09:22:36","guid":{"rendered":"http:\/\/8.211.42.149\/?post_type=products&p=1517"},"modified":"2026-06-02T17:13:46","modified_gmt":"2026-06-02T09:13:46","slug":"r31","status":"publish","type":"products","link":"https:\/\/walleglobal.com\/de\/products\/r31\/","title":{"rendered":"R31"},"content":{"rendered":"
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R31<\/h2>\n<\/div>\n\n\n\n
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Temp range<\/td>-30\u00b0C~200\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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Product Overview<\/strong><\/div>
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The R31 Series Star Seal also known as the R-Ring or Octagonal Seal is a premium double-acting reciprocating and static sealing solution engineered for severe industrial environments. Moving beyond traditional O-rings and X-rings, its unique symmetric octagonal cross-section profile delivers precise initial pre-compression and excellent fluid-dynamic self-tightening under high pressure.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n

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Material Characteristics<\/strong><\/div>
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To withstand aggressive chemical media, extreme temperatures, and heavy friction, the R31 is available in specialized high-performance elastomers and engineering plastics:<\/p>\n\n\n\n

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  • FFKM Perfluoroelastomer:<\/strong> Universal chemical resistance and thermal stability up to +325 degrees Celsius. Ideal for semiconductor etch processes and aerospace fuels.<\/li>\n\n\n\n
  • FKM Viton:<\/strong> Superior resistance to high temperatures (-20 to +200 degrees Celsius), oils, ozone, and aging. Standard for automotive and oil and gas.<\/li>\n\n\n\n
  • HNBR Hydrogenated Nitrile:<\/strong> Exceptional tensile strength, wear resistance, and H2S sour gas durability. Rated up to +150 degrees Celsius.<\/li>\n\n\n\n
  • PTFE Filled Grades:<\/strong> Ultra-low friction coefficient. Eliminates stick-slip\/crawling issues in high-speed or ultra-low-speed servo cylinders.<\/li>\n\n\n\n
  • UHMWPE:<\/strong> Unrivaled abrasion resistance against abrasive solid particles and slurries.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n
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    Structural and Performance Advantages<\/strong><\/div>
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    Anti-Spiral Failure: The wide, flat base of the octagonal profile provides high mechanical resistance against twisting inside the groove, completely preventing spiral roll-over during long-stroke reciprocating movements.<\/p>\n\n\n\n

    Low Friction and No Stick-Slip:<\/strong> At zero pressure, the multi-faceted profile creates narrow, concentrated linear contact zones rather than large surface contact, reducing startup and dynamic friction by over 30 percent.<\/p>\n\n\n\n

    Pressure-Activated Self-Tightening:<\/strong> When fluid pressure increases, the geometry naturally expands the sealing lips, ensuring reliable sealing and high extrusion resistance at pressures exceeding 40 MPa.<\/p>\n\n\n\n

    Integrated Lubrication Pockets:<\/strong> The symmetric concave indentations act as micro-reservoirs that trap lubricant during the stroke, ensuring continuous oil-film retention and extending service life.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n

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    Application Scope<\/strong><\/div>
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    High-Pressure Hydraulic and Pneumatic Cylinders:<\/strong> Heavy-duty construction machinery, hydraulic supports, and high-frequency servo actuators.<\/p>\n\n\n\n

    Precision Metering and Dispensing Systems:<\/strong> Polymer metering gear pumps, chemical dosing systems, and premium hot-melt adhesive equipment such as aftermarket Nordson systems.<\/p>\n\n\n\n

    Semiconductor and Vacuum Chambers:<\/strong> High-purity FFKM R31 seals for plasma etch chambers and vacuum isolation doors.<\/p>\n\n\n\n

    Oil and Gas Subsurface Tools:<\/strong> Downhole safety valves (DHSV), Christmas trees, and MWD\/LWD drilling tools handling high-pressure, high-temperature (HPHT) multi-phase flows.<\/p>\n<\/div><\/div>\n<\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n

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