Nonrotating lower stem, 

Multiple seat and seal materials available, 

Valve back seals in fully open position, 

Stem threads roll formed for mechanical performance, 

Upper stem threads grease segregated from system media, 

Packing can be externally adjusted, 

Bonnet is equipped with antitampering screw, 

Working pressures up to: 
GV1, 414 bar (6,000 psig), 
GV1H, 690 bar ( 10,000 psig), 

Operating temperatures: 
PTFE packing: -65°F to 450°F (-54°C to 232°C), 
graphite packing: -65°F to 1200°F (-54°C to 649°C).