One-piece precision forged body, 

Safety bonnet construction prevents accidental disassembly of the valve under extreme service conditions, 

Two-trunnion stem design with roll-hardened upper stem threads and specially hardened lower stem surfaces, 

Upper stem threads are grease segregated from the system media, and the nonrotating lower stem moves up and down instead of rotating up and down to minimize wear on the packing during each stroke and to minimize friction between the seat and the head, 

Valve has back-seal function in the fully open position. The valve has a back seal in the fully open position. 

Maximum working pressures: 
N6 series: 414 bar (6000 psig), 
N6H series: 690 bar (10000 psig), 

Operating temperatures: 
-54°C to 232°C (PTFE packing), 
-54°C to 260°C (PEEK packing), 
-54°C to 649°C (graphite packing).