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.

Features

• 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.)

Specification:

Type: Quarter-turn Rotary Valve

Size Range: DN 25 to DN400；1” to 16”

Pressure Rating: PN 10 to PN 40；Class 150 to 300

Body Materials: Carbon steel; Stainless steel; Most alloys

Temp. Range: -30℃ to 350℃；-22℉ to 662℉

Industries:

Bleach Chemicals, Chemical and Liquor, Paper Stock, Digester, Coating