Notice: Function WP_Styles::add was called incorrectly. The style with the handle "pods-query-monitor" was enqueued with dependencies that are not registered: query-monitor. Please see Debugging in WordPress for more information. (This message was added in version 6.9.1.) in /home/valveccdevcoza/domains/valve.ccdev.co.za/public_html/wp-includes/functions.php on line 6131

Brand: NAF

NAF manufacture process control valves, including butterfly, ball segment and ball valves for chemical, pulp & paper and mining & minerals.

NAF – ProCap Capping Valve For Pulp Digesters

Safe Filling. Tight Shut-Off. Long-Term Reliability.

The NAF-ProCap capping valve is specifically engineered for the demanding conditions found in batch pulp digesters, where safe, controlled chip filling and reliable shut-off are essential for maintaining production uptime. Designed as a quarter-turn ball segment valve with heavy-duty materials, the ProCap ensures dependable operation during high-load cycles, pressure fluctuations and severe chemical exposure commonly encountered in the pulp and paper industry.

Its robust construction—including a reinforced hub design, welded Alloy 21 sealing surfaces and stainless steel body—provides excellent resistance to erosion, wear and thermal cycling. The ProCap’s eccentric ball segment is machined to deliver tight sealing performance and withstand the repeated mechanical stresses of rapid open/close cycles. Optional SIL-rated safety functions and independent “jammer” lock systems further enhance digester protection.

With direct actuator mounting and availability in large sizes up to 30–32 inches, the NAF-ProCap offers a compact, reliable capping solution that integrates seamlessly into modern or legacy digester platforms. From safety-critical isolation to efficient chip charging, it provides pulp mills with a durable, low-maintenance valve package designed for long service life under harsh operating conditions.

For technicians, engineers and production managers, this means:

  • Higher digester availability – Reliable shut-off performance supports stable batch cycles and reduces chip loss events.
  • Improved operator safety – SIL-capable actuation, secure locking systems and robust sealing lower the risk of unplanned openings.
  • Extended component life – Alloy 21 and reinforced hub/seat materials resist wear from chips, chemicals and high mechanical loading.
  • Reduced maintenance interruptions – Streamlined internal design minimises build-up, improves flushing and simplifies inspection.
  • Lower total cost of ownership – Durable construction and optimized sealing reduce replacement frequency and improve lifecycle performance.
  • Dependable performance under harsh conditions – Engineered specifically for pulp mill digester duties, not adapted from general-purpose valves.

NAF – Duball DL Ball Valve

High-Performance Full-Bore Isolation and Control

The NAF-Duball DL is a full-bore, metal or soft-seated ball valve engineered for isolation, on/off and modulating control in demanding industrial services. Its split-body construction, spring-loaded stem packing, and bidirectional sealing deliver reliable shut-off and stable operation, even with difficult media and high differential pressures. A blowout-proof stem, rigid seat designs, and a robust torque path ensure consistent performance, while the off-centre body joint enables fast seat and ball replacement without removing the actuator. With direct mounting of the NAF-Turnex actuator and full integration with the NAF-D30 intelligent positioner, the Duball DL provides a compact, vibration-resistant valve package suitable for severe service across chemical, pulp & paper, mining, petrochemical and power applications.

For technicians, engineers and production managers, this means:

  • Reliable long-term sealing – Spring-loaded stem packing provides stable, maintenance-free operation in automated and control services.
  • Consistent shut-off under demanding process conditions – Floating ball design delivers bidirectional tightness, even with challenging media.
  • Reduced downtime during shutdowns – The off-centre body joint allows seat and ball replacement without removing the actuator, simplifying maintenance.
  • Stable torque transmission – Blowout-proof stem with long foot minimises backlash, ensuring predictable operation and accurate control.
  • Flexible trim and material options – Reinforced PTFE seats, Alloy 6 metal seats, sealed or scraper designs, and high-temperature variants address a wide range of duties.
  • Optimised for automation and control loops – Direct mounting of NAF-Turnex actuators and optional NAF-D30 positioners creates a compact, vibration-resistant valve package.
  • Improved process stability in high-energy applications – Optional Z-trim reduces cavitation and noise, protecting downstream equipment.

Our Valve Repair Centres in Secunda and Durban provide expert repair, reconditioning, automation and testing services, ensuring that your NAF-Duball DL valves remain in peak condition.

Robust design. Stable operation. Lower maintenance effort. 

Scan the code