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Valves Ball Valve for the Chemical Processing Industry

Editor: Dominik Stephan

Flowserve, a US based manufacturer of flow control products and services for the global infrastructure markets, announced the release of the Flowserve NAF Duball DL ball valve featuring spring-loaded packing technology – The latest addition to the company's full bore, metal seated NAF Duball valve range.

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"The NAF Duball has been a popular choice in some of the most demanding applications worldwide, due to its safe and effective operation and its ability to help minimize plant downtime," said Keith Barnard, vice president and general manager, Flow Control Division, General Industries Sector.
"The NAF Duball has been a popular choice in some of the most demanding applications worldwide, due to its safe and effective operation and its ability to help minimize plant downtime," said Keith Barnard, vice president and general manager, Flow Control Division, General Industries Sector.
(Picture: Flowserve)

The patented Z-trim option improves control behaviour, providing high rangeability, and also provides anti-cavitation functionality and noise attenuation, the company says. A NAF Turnex pneumatic actuator can be mounted on the ball valve and offers an ideal high-performing, vibration-resistant compact valve package providing economical total cost of ownership. The design incorporates new spring-loaded stem packing technology on ANSI class 150 and 300 versions covering applications up to 250 degrees Celsius/482 degrees Fahrenheit.

The NAF Duball product family has a split body with floating ball design providing excellent leak tightness. The valve's ball and seat are designed to be easily serviced without removing the valve stem and actuator. The valve can be used in automated on/off applications, suited for a wide range of control options. The ball valve's spring-loaded packing remains tight for a higher number of cycles, virtually eliminating the need for manual retightening of the packing. The mechanical backlash is minimized by the uniquely designed long connection between the ball and stem.

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