Carbon/Graphite Seated Valves

Carbon/Graphite Seated Valves for high-temperature liquid applications. Ideal for high flow applications that may distort or tear seats made of other seat materials.

Selecting the proper seal design is critical. A failed seal can damage expensive equipment and result in costly repairs, maintenance and downtime. Because of carbon and graphite’s natural characteristics, it is often used as a seal material. When carbon/graphite and metal rub together, a microscopically thin low-friction film is created. This film prevents the interface from heating up if it becomes dry during rubbing. In addition, carbon has the benefit of being nearly chemically inert and self-lubricating.

Carbon/Graphite is relatively unaffected by temperature or temperature swings. Therefore, distortion caused by swelling with heat, or contracting with cooling, is virtually eliminated. PBM’s Carbon/Graphite-seated valves can handle temperatures up to 700°F.

PBM’s Carbon/Graphite Seated Valves have successfully passed a 10,000-cycle hot oil test at 650°F, demonstrating the valve’s suitability for use with hot liquids, including heat transfer oils.

  • Temperature swing applications, from start-up to 700°F.

PBM Standard:  Style to suit the application: Two-way, Flush Tank, ANSI, Diverter Port, and Multi-Port.
Testing Seats: are tested with water to meet ANSI/FCI 70-2 Class V requirements.
Sizes: 1/2″- 8″ for 2-way and Flush Tank Valves, 1/2″ – 6″ for Diverter Port Ball Valves and AN Series Ball Valves, and 1/ 2″- 6″ for Multi-Port Ball Valves.
End Fittings: Threaded, welded, and 150# and 300# flanged.
Ratings: Depending upon end fitting style, body material, and size, pressure ratings are as high as 650 psig at 700°F.
Graphite Stem Packing: Die-molded graphite compliments the chemical inertness of the seats. Live-loaded stem packing increases stability in temperature swing applications.
Body Seals: Metal O-ring or graphite gasket assures leak-tightness and flexibility during temperature swings.
Stem: Select sizes include special 17-4PH stainless steel stem to accommodate higher stem torques.
Extended Stem and/or Bracket: To allow space for insulation in high-temperature applications, manual valves can be provided with a 2″ or 4″ extended stem, and actuated valves with an
extended bracket and coupling.
Favorable Expansion Rates: Carbon/Graphite expands slightly less than the surrounding metal, thus avoiding torque build-up at elevated temperatures.
No Swelling: Unlike some polymer-based seals, Carbon/Graphite doesn’t swell when exposed to fluids.
Chemical Stability: Carbon/Graphite is chemically inert in most environments, except those that are strongly oxidizing.
Materials: Carbon/Graphite seated valves are available in 316 S/S, Carbon Steel, and other alloys.

Please Contact Brian Barry for a quote on PBM Valves today at 021 4617 200.

Carbon/Graphite Seated Valves are designed for use in applications such as:

  • Heat transfer fluid service
  • High temperature/pressure liquids, from water to polymers.
  • Temperature swing applications, from start-up to 700°F.

Contact our Valve Specialist Team:

Brendan Merrigan (External) – Mob: 087 2598124                           

Internal Team

Brian Barry – Tel: 021 461 7211

Darragh Rodgers- Tel: 021 461 7241

Miriam Adair- Tel: 021 461 7235

Ross O’Donovan – Tel: 021 461 7230 

Shauna O’Connor – Tel: 021 461 7237

Tim Quigley – Tel: 021 461 7209

Vicki McGrath – Tel: 021 461 7207

Tel: 021 461 7200