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NAF Trunnball

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The NAF Trunnball DL is a full-bore trunnion-mounted ball valve developed by Flowserve engineers with over 80 years of experience in manufacturing ball valves. The valve is designed to offer bidirectional tightness, low friction, and high controllability, making it an excellent choice for isolation, on/off, and modulating control applications.

 

It is available in standard materials such as stainless steel and carbon steel, with options for other materials like Duplex and titanium. The NAF Trunnball DL is equipped with features such as a spring-loaded stem seal packing, a blowout-proof stem, and low friction bearings, ensuring long, maintenance-free operation.

  • Technical Data
  • Advantages
  • Industries
  • Applications
  • Documents
  • Contact

Technical Data

  • Size Range: DN 150–800 (6” to 32”)
  • Pressure Rating: PN 10-40 (ANSI Class 150, 300)

Advantages

  • Trunnion-mounted ball provides bidirectional tightness and excellent control performance.
  • Low friction bearings ensure low torque and smooth operation, even at high differential pressures.
  • Spring-loaded stem seal packing offers maintenance-free and safe operation in automated on/off and control service.
  • Direct actuator mounting capabilities with NAF Turnex actuator provide high performance and vibration resistance.
  • Sturdy, blowout-proof stem for high torque transmission with minimal mechanical backlash.
  • Z-trim option minimizes cavitation and noise while providing excellent control characteristics.
  • Easy-to-service design with off-centre valve body joint, allowing easy replacement of the ball and seals without removing the stem and actuator.
  • Metal seats with a rigid welded overlay of Alloy 6 or metal-supported, reinforced PTFE seats.

Industries

Suitable for industries where media and extreme pressure conditions demand robust design, material, and performance.

Applications

The NAF Trunnball DL is an ideal solution for applications that require tightness and control in both directions, especially under high differential pressures. Its robust design and material options make it suitable for demanding applications in various industries.

Contact Us

Contact our Valve Specialist Team

  • Brendan Merrigan (External) – mob: 087 2598124
  • Vicki McGrath – tel: 021 461 7207
  • Brian Barry – tel: 021 461 7211
  • Tim Quigley – tel: 021 461 7209
  • Ross O’Donovan – tel: 021 461 7230
  • Shauna O’Connor – tel: 021 461 7237
  • Tel: 021 461 7200

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