Graphite stem packing for high-temperature service.Free-swivelling SS ball stem prevents seating surface damage, ensures perfect alignment and bubble-tight shutoff.One-piece handle assembly prevents loss due to vibration or maintenance.Rolled stem threads prevent galling and extend valve life. Stem is polished to a mirror finish to minimize packing wear.Back seat design provides secondary stem seal and prevents accidental stem blowout under pressure.Full pressure and temperature range up to ASME Class 2500.Patented bonnet lock prevents accidental loosening of the bonnet-to-body seal and allows panel mounting without additional parts.Metal-to-metal bonnet-to-body seal in constant compression prevents bonnet thread corrosion, eliminates possible tensile breakage and provides a reliable seal point.Repairable metal seat can be resurfaced, when not under pressure, without removing the valve from the line.Materials of construction designed to meet ASME B31.1 or B31.3.Range of optional end connections