NAF Trunnball

The NAF Trunnball DL is a full-bore trunnion-mounted ball valve, developed by Flowserve engineers with more than 80 years of experience manufacturing ball valves. The ball is supported by two large, low friction trunnion bearings for consistent low torque even at high differential pressures. Due to its bidirectional tightness, low friction and high controllability, it is an excellent choice for isolation, on/off and modulating control applications.
NAF Trunnball DL is supplied as standard in stainless steel or carbon steel but is also available in other materials e.g. Duplex, titanium, etc.
The valve has:

• A spring-loaded stem seal packing that provides long, maintenance-free and safe operation in automated on/off and control service
• Direct actuator mounting capabilities of the NAF Turnex actuator which provide a high performance, vibration resistant, compact valve package
• A sturdy, blowout-proof stem providing high torque transmission with a minimum mechanical backlash for optimum controllability
• A trunnion-mounted ball providing bidirectional tightness
• Low friction bearings for low torque and smooth operation
• The unique Z-trim option that minimizes cavitation and noise and has excellent control characteristics
• An extensive size range, DN 150–800, size 6” to 32”
• An easy-to-service arrangement, due to the off-centre joint face of the valve body, which allows for easy replacement of the ball and seals without the need for removing the stem and actuator
• Metal seats with a rigid welded overlay of Alloy 6 or alternatively, metal supported, reinforced PTFE seats

CE-marked according to Pressure Equipment Directive (PED 97/23/EG) module H, category III. For module H1, category IV
contact NAF.

The Flowserve NAF-Trunnball design provides excellent control performance and tightness in both directions, even at high differential pressures.
DN150-800 (6″-32″)
PN10-40 (ANSI Class 150, 300)

NAF-Trunnball is an excellent solution where media and extreme pressure conditions make severe demands on design, material and performance. Equipped with NAF´s unique pre-load self-adjustable double stem packing.
The trunnion mounted ball design provides excellent control performance and tightness in both directions, even at high differential pressures. Service-friendly due to the off-centre body split and modular design.
NAF-Trunnball is an integrated part of the NAF control valve package with a unique direct mounting concept.