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Union Bonnet Needle Valves NU/NUH Series
NU and NUH Series Union Bonnet Needle Valves feature a one-piece forged body with a working pressure of up to 10,000 psig. The union bonnet design prevents accidental disassembly. The two-piece stem design includes cold-rolled upper stem threads and a hardened lower stem for strength and smooth operation. The upper stem thread lubricant is isolated from system media. The non-rotating lower stem moves linearly up and down instead of rotating, minimizing packing abrasion and reducing friction between the seat and tip. A safety back-seating seal is provided in the fully open position. Available in various connection types, sizes, and handle colors. The handle is securely fastened with double lock-pins.
NU Series: Working pressure up to 6000 psig
NUH Series: Working pressure up to 10000 psig
Features Union Bonnet Needle Valves
◎ One-piece forged body
◎ Two piece- stem design: Upper stem threads cold rolled and lower stem hardened for high strength and smooth operation
◎ Accidental valve disassembly disabled by union bonnet construction
◎ Upper stem thread lubricant isolated from system media
◎ Linear instead of rotary movement of the rising, non-rotating stem minimizes packing abrasion and reduces the friction between the seat and the tip
◎ Safety back seating seal in fully open position
◎ Panel mounting available
◎ Steady and durable fastening of the handle by double lock-pins
◎ Handles of different colors available
◎ Every valve leak tested with Nitrogen or compressed air (NU Series)
at the maximum allowable working pressure or with water (NUH Series)
at 1.1 times the maximum allowable pressure
◎ Working pressure up to:
NU Series Stainless steel: 6000 psig (414 bar)
Alloy C-276: 6000 psig (414 bar)
Alloy 400: 5000 psig (345 bar)
Titanium: 3500 psig (241 bar)
NUH Series Stainless steel: 10000 psig (690 bar)
◎ Working temperature:
PTFE: -65°F to 450°F (-54°C to 232°C)
PEEK: -65°F to 500°F (-54°C to 260°C)
When the connection type of valves is FITOK double ferrule tube fitting, the working pressures of the valves are related to the wall thickness of tubing applied. For specific working pressure of the valves.
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