NAF – Duball DL Ball ValveEnquire Now

NAF 8211 Duball DL Ball ValveNAF 8211 Duball DL Ball ValveNAF 8211 Duball DL Ball ValveNAF 8211 Duball DL Ball Valve

BRAND: NAFCATEGORY: Ball Valves, Control Valves,

The NAF-Duball DL is a high performance, metal or soft seated full bore ball valve equally suitable for isolation, on/off and rotary modulating control applications. It is supplied standard in stainless steel or carbon steel but can be supplied in materials such as Duplex, Titanium etc. The excellent characteristics of the NAF-Duball DL are particularly beneficial under the most challenging operating conditions in the process industry, where difficult media and demanding pressure conditions make severe demands on the design, materials and performance.

The unique spring loaded stem seal packing guarantees a long maintenance-free and safe operation. The floating ball provides bi-directional tightness and the sturdy blow-out proof stem with long foot provides the torque transmission with minimum of backlash. The metal seats have a rigid welded overlay of Alloy 6 or alternatively, metal encapsulated, reinforced PTFE seats.

NAF-Duball DL has direct actuator mounting capabilities of the NAF-Turnex actuator which provides a high performance, vibration resistant, compact valve package. When required for modularting control applications, the standard factory fitted NAF-D30 Intelligent Valve Positioner is easy and fast to calibrate with Advanced / Premium diagnostics to ensure you can monitor valve performance. An optional air block can be fitted to connect the positioner to the actuator so that external piping that can easily be damaged is a thing of the past.

An easy-to-service arrangement, due to the off-centre joint face of the valve body, allows for easy replacement of the ball and seals, without the need for removing the stem and actuator.

The valve is available with a wide range of options with regards to materials, seat configuration, low noise and anti-cavitation trims and other special versions. API 607 and ISO 10497 fire safe compliant versions are available.

Contact one of our technical specialists for a quote today or download the brochure to learn more!

Specifications

SeriesDuball DL
Design

Split Body Floating Ball

Features
  • A spring loaded stem seal packing that provides a long, maintenance free and safe operation in automated on/off and control service
  • A sturdy, blowout-proof stem with a long foot providing a high torque transmission with a minimum mechanical backlash
  • A floating ball that provides bidirectional tightness with metal seats with a rigid welded overlay of Alloy 6 or alternatively, metal encapsulated, reinforced PTFE seats
  • NAF modular concept means no mounting brackets and direct actuator mounting capabilities of the NAF-Turnex actuator which provides a high performance, vibration resistant, compact valve package
  • An easy-to-service arrangement, due to the off-centre joint face of the valve body, which allows for easy replacement of the ball and seals, without the need for removing the stem and actuator
  • The unique Z-trim option that minimizes cavitation and noise and has excellent control characteristics
  • CE-marked according to Pressure Equipment Directive (PED 97/23/EG)
  • A wide range of optional versions, including fire safe tested versions acc. to API 607/ISO 10497
Size
Range

25mm to 400mm / 1” to 16”

Pressure
Rating

PN10 – 40 / ANSI 150 – 300

Temperatures-30°C to 250°C
End
Connections
Flanged
Body
Materials

Carbon steel WCB / Stainless Steel CF8M / Alloy steels / ASTM A351 CG8M (317) / ASTM A351 CG3M (317L) / Duplex EN 1.4470 / 904L and many others

Seat
Materials
R-PTFE / SS + Alloy 6 overlay / Duplex + Alloy 6 / Solid Alloy 6
Ball
Materials
SS / SS + Hard Chrome / SS + Alloy 6 / Duplex + Alloy 6 / Solid Alloy 6
Options &
Accessories
Applications

Isolation, on/off and control for chemicals, pulp, hydrocarbons and steam in the Chemical Processing, Pulp & Paper, Synthetic Fuels, Oil & Gas and Refining industries throughout Southern Africa

PRODUCT ENQUIRY

Download Request

Please fill in your details below to view the brochure.

Submit