Non-Lubricated Plug Valves - G4BZ-HF Marathon Sleeveline HF Alkylation valve

Non-Lubricated Plug Valves - G4BZ-HF Marathon Sleeveline HF Alkylation valve
Product Brand
Non-Lubricated Plug Valves
About this product

Flowserve has supplied thousands of Durco G4BZ-HF Marathon Sleeveline HF alkylation valves to refineries throughout the world. Engineered for high-cycle, low-emissions service, this non-lubricated plug valve offers an extra measure of positive stem sealing reliability. It can be used with confidence in applications where tight shutoff and emissions containment are unconditional requirements to ensure safety.


Durco G4BZ-HF Marathon valves are Phillips Licensing listed and UOP Process Division approved for the following applications:

  • Isomerization
  • Blending
  • Light ends
  • Gas plants
  • Sulfur plants
  • Crude desalting

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Specifically designed and refinery proven for use on HF Alkylation with bonnet and flanges painted in HF detection paint

  • ASME B16.34
  • ASME B16.10
  • API 607
  • ISO 15848-1
  • MSS SP-134
  • API 598
  • API 599
  • Phillips/UOP approved 

Size Range: 1/2" - 18"

Pressure Class Range: class 150-300

Seating Material: PFA, Durlon II, UMPHWE, TFEG, TMHT

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