Non-Lubricated Plug Valves - G4

Brand: Flowserve Durco

The Durco G4 Sleeveline plug valve is engineered for use the most corrosive and difficult chemical services where drop-tight shutoff is an absolute requirement.

It offers the proven reliability of the plug/PTFE sleeve primary seal with a fluoropolymer diaphragm secondary seal.
  • Dependable, tight shutoff and in-line seal adjustment from tapered plug design
  • Lower maintenance costs due to design that utilizes two adjuster fasteners that permit in-line seal adjustments under pressure within seconds
  • Low fugitive emissions through fluoropolymer reverse-lip diaphragm that provides a pressure-activated, self-energizing dynamic and static stem seal
  • Compatibility with a range of Automax actuators and other instrumentation
  • Options for lethal, toxic and sub-zero fluid services plus process control and high flow requirements


Pressure Class Range

  • Class 150-300

Seating Material

  • PFA
  • Durlon II
  • TFEG
  • MHT

Size Range

  • 1/2” - 18”


  • ASME B16.34
  • ASME B16.10
  • API 607, ISO 15848-1
  • API 598
  • API 5

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