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Description
KVSP® is the Kalrez® Valve Stem Packing system from DuPont Performance Elastomers.
It comprises alternate V-rings of Kalrez® perfluoroelastomer FFKM, and rings of Teflon® PTFE or Zymaxx® (composite of carbon fibre and PFA Teflon®) to form a three- or five-part packing set.
Typical applications
Widely used to minimise fugitive emissions, particularly in control valves. A five-part set can typically reduce valve stem leakage to less than 10ppm at oil, gas, petrochemical and chemical processing plants.
Specifications
Kalrez®/Zymaxx® configuration, with addition of flexible graphite end ring, has passed API 607 3rd Edition Fire Test, and complies with BS6755.
Prime features
Chemical properties
All KVSP components display outstanding chemical resistance; inert to media in the range pH 0-14.
Service capabilities - valve stem duties
Maximum operating temperatures
With Teflon® rings: +200°C.
With Zymaxx® rings: +260°C (short excursions to +280°C).
Minimum operating temperature: 0°C.
Maximum system pressure: 17MPa.
How supplied
Standalone packing sets and accurately calibrated live-loaded kits, together with full technical support, are supplied by James Walker as Authorised Distributor of Kalrez® parts in the UK. Full fitting instructions are included. DuPont Performance Elastomers recommends that individual valve designs and duties are verified before KVSP® installation.
