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Supagraf® HT

An ultra‑high temperature resistant packing suitable for critical valves handling high temperature media.

  • Critical valves
  • High temperature
  • Molten salt

Supagraf HT is one of James Walker’s high performance packings suitable for critical valves handling various high temperature media such as molten salt used in solar, nuclear, chemical, energy storage, and hydrogen production industry sectors.

Premium grade unique and bespoke combination set construction comprising of high temperature mechanically stable intermediate and end ring DS Pro spacers supported by high purity graphite-based intermediate packing rings.

Graphite rings: High performance packing braided from high purity 98% exfoliated dry graphite yarn with passive corrosion inhibitor, reinforced with fine Inconel wire and free from all other additives or dispersions in order to maximise temperature and corrosion resistance capabilities. Graphite base material conforms to Shell material specification MESC SPE 85/204.

DS Pro spacers: Precision cut spacers made of state-of-the-art material designed for electro-mechanical and thermo-mechanical applications with excellent resistance to heat and open flame up to 1000°C (1832°F). Excellent electrical insulation and high resistance to pressure as well as impervious to most chemicals such as molten salt. The product has improved dimensional stability at high temperatures, low water absorption and is asbestos free, ecologically safe and non-toxic. Typically of 2-3 mm thickness and in multiple layers, customised to valve stuffing box geometry and design.

  • Exceptional high temperature resistance
  • Excellent chemical resistance
  • Corrosion resistance capabilities
  • Inconel wire reinforcement enhances thermal expansion capabilities in high temperature cycles
  • Low oxidation rate and long service life in high temperature applications
  • Easy to install, remove and replace
  • 3rd party tested in high temperature molten salt valve applications
  • Suitable for both rotary as well as rising-stem valve applications from pressure Class 150 up to Class 600
  • Please contact us for further advice for higher Class range suitability

Supagraf HT is designed for chemically aggressive and abrasive operating conditions in all types of valves, where resistance to high temperature media such as molten salt as well as extended dynamic sealing performance is required.

Valve stem duties

  • Maximum operating temperature: Up to +650°C (+1202°F)
  • Minimum operating temperature: -200°C (-328°F)
  • Maximum system pressure (standard): 10 MPa/100 bar (1450 psi) - contact us for advice on use at higher pressures

Compatible with media in the range of pH 0-14 excluding strong oxidising agents. The product has negligible volatile content.

  • As preformed graphite rings with a single split combined with precision cut DS Pro spacers supplied endless or split in two matched halves
  • Product made to order to suit application requirements
Related Downloads

Supagraf HT combination set fitting guide

English pdf (549 KB) Download

Supagraf HT datasheet

English pdf (268 KB) Download

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