NAF – Duball DL Ball ValveEnquire Now
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.
Split Body Floating Ball
DN 25 – 400 / 1” – 16”
PN10 – 40 / ANSI 150 – 300
|-30°C to 250°C
Carbon steel WCB / Stainless Steel CF8M / Alloy steels / ASTM A351 CG8M (317) / ASTM A351 CG3M (317L) / Duplex EN 1.4470 / 904L and many others
|R-PTFE / SS + Alloy 6 overlay / Duplex + Alloy 6 / Solid Alloy 6
|SS / SS + Hard Chrome / SS + Alloy 6 / Duplex + Alloy 6 / Solid Alloy 6
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