• Valves

    Flowserve is an industry-leading provider of valves used in a wide variety of global infrastructure industries.

NAF Duball Ball Valve

The NAF Duball is a full-bore ball valve which is equally suitable for use as a modulating control valve, on/off control valve or shut-off valve. The NAF Duball is supplied as standard in stainless steel and is available in other materials.

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  • Brands:
    NAF
  • Applications:
  • Industries:
    Bleach Chemicals, Chemical and Liquor, Paper Stock, Digester, Coatings
  • Standards:
  • Misc:

The NAF Duball has several features, including:

  • Easy maintenance: Ball and seals can be serviced, without the need for removing the stem and actuator.
  • A floating ball that seals in either direction of flow, and at low differential pressures.
  • Sturdy, blowout-proof stem that transmits torque evenly.
  • Stem seal with maintenance free O-ring seals and an optional stuffing box.
  • Metal-to-metal Alloy 6 seat rings or carbon reinforced PTFE soft seats.
  • A wide selection of alloys available for the ball. 
  • NAF standard close-mounted actuator, which simplifies installation and results in a compact valve/actuator unit. 
  • Many optional features (some options may not appear in the literature. Contact NAF.)

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Duball ball valves

Maintenance and installation instructions for the Duball ball valve

Certificate SIL Duball

Certificate SIL for Duball

Duball ball valves

Technical Brochure for the NAF-Duball ball valves

Trimball

Description: A control valve for the most difficult applications where high pressure drops are present, causing cavitation, noise and erosion.

NAF Setball V-Port Valve

Description: The NAF Setball combines the best control characteristics of the ball valve and the eccentric plug valve. The Setball can be used as both a control valve and as a shutoff valve. Standard in stainless steel, this valve is also available in other materials, such as CG8M, Titanium, etc.

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Description: Heavy-duty actuator for high performance modulating control.

LinkIT

Description: A high performance spool valve makes one size fit all sizes of actuators and creates high air capacity.

Torex

Description: High performance butterfly valve. Triple offset disc for tight shut-off and to eliminate seat wear.

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