NAF Setball SF Segment Ball Control ValveEnquire Now

NAF-Setball SF segmented ball valve with NAF-Turnex actuator – side angle view

Setball SF V-Port Control

NAF-Setball SF segmented ball valve with rack & pinion actuator – front view

Setball SF + Rack & Pinion

NAF-Setball SF segmented ball valve – internal cutaway showing ball segment and shaft

Setball SF Cut-Away

Exploded view of NAF-Setball SF segmented ball valve showing internal components and modular trim

Setball SF Exploded View

BRAND: NAFCATEGORY: Control Valves

Compact, Precise, and Built for Harsh Process Conditions

Precision Control. Reduced Downtime. Built for Harsh Conditions.

The NAF-Setball SF is a compact, high-performance ball sector control valve engineered for precise modulating service—even in the most demanding process environments. Whether you’re working with fibres, slurries, or standard utility services, this V-port segment ball control valve offers excellent control characteristics and long-term reliability where it matters most: in the field.

Designed with input from process control professionals, the NAF-Setball SF delivers:

Tight, Repeatable Control – The splined stem-to-ball connection ensures zero backlash for accurate response and stable loop performance.
High Rangeability & Equal Percentage Flow – Enables better control across a wide operating window, reducing hunting and improving PID loop stability.
Reduced Maintenance Burden – The robust one-piece stainless steel body and metal seat with welded Alloy 6 overlay provide exceptional resistance to erosion and wear. When service is needed, the seat and seal can be replaced quickly—without removing the actuator or segment.
Space- and Weight-Saving Design – Its short face-to-face wafer construction makes it ideal for compact skid designs and tight retrofits, lowering installed cost and simplifying handling.
Reliable Valve Package – With direct mounting of the NAF Turnex actuator and factory-fitted NAF-D30 intelligent positioner, you get a vibration-resistant, tightly integrated control solution that’s fast to calibrate and easy to diagnose.

The standard Zebra-CL™ live-loaded stem packing is certified to EN ISO 15848-1 for fugitive emissions, supporting environmental compliance while delivering leak-tight performance up to 250°C.

From process optimization to plant reliability, the NAF-Setball SF puts control back in your hands—with fewer maintenance headaches and more uptime.

Our Valve Repair Centres in Secunda and Durban provide expert valve repair, reconditioning, automation, and testing services ensuring that your NAF-Setball SF valves remains in peak condition.

Speak to one of our control valve specialists today or download the technical brochure to explore detailed specs.

Precision control. Maximum uptime. Minimal intervention.

Download the NAF-Setball SF Technical Bulletin

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Contact us Today – Tel: 0861 103 103

Valve Repair Services

Specifications

Series	Setball SF
Design	V-Port Ball Sector Control Valve
Features	Segmented V-port ball design – Engineered to provide equal-percentage inherent characteristics, delivering predictable flow modulation even under varying differential pressures. Rigid metal seat construction – Alloy 6 welded overlays ensure long-term sealing performance in erosive or high-velocity service, maintaining shut-off capability over extended operating periods. High structural integrity – The one-piece valve body offers dimensional stability under thermal cycling and process vibration, supporting consistent actuator alignment and torque transmission. Optimised stem support – Dual low-friction bearings minimise stem loading and maintain smooth rotational movement, reducing hysteresis in automatic control applications. Balanced shaft geometry – Provides favourable torque characteristics across the full travel range, allowing accurate positioning even in demanding PID loop conditions. Flexible seat and seal configurations – Available in reinforced PTFE, metal seat, and scraper-style designs to match different process media and shut-off class requirements. Wide material options – Stainless steels, duplex alloys, and other corrosion-resistant materials allow configuration for fibre service, abrasive slurry handling, and corrosive chemical duties. Zebra-CL™ live-loaded packing – Ensures stable stem sealing performance under thermal cycles and supports fugitive-emission compliance in critical applications. High temperature capability – Suitable for elevated temperatures up to 250 °C, depending on materials and seat configuration. Compact, lightweight design – Wafer pattern construction reduces total valve mass and centre-of-gravity loading on pipework, supporting easier installation and improved mechanical stability.
Size Range	DN 25 – 250 / 1” – 10”
Pressure Rating	PN 40 / ANSI 150 – 300
Temperatures	Up to 250°C
End Connections	Wafer
Body Materials	Stainless Steel EN1.4408 / CF8M
Seat Materials	Metal Seats Alloy 6 / Stainless Steel
Ball Materials	Stainless steel EN1.4408 / CF8M + Hard Chrome Overlay
Options & Accessories	Profibus Valve Positioners HART Valve Positioners Air block to connect actuator and positioner replacing older piping that are easily damaged
Applications	Process control applications throughout industry Media that contains solids and particles Pulp stock and media containing fibres Where an accurate and wide control range is required High pressure drops