Durco G4 Non-Lubricated Plug Valves

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.


Features and Benefits

  • 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


  • Chemicals

  • Oil & Gas

Industry Sectors

  • Basic (Organic & Inorganic)

  • Specialty (Fine & Consumer)

  • Petrochemicals

  • Downstream Processing


  • ASME B16.34

  • ASME B16.10

  • API 607, ISO 15848-1

  • API 598

  • API 5

Design Range

Size Range: 1/2" - 18"

Pressure Class Range: class 150-300

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