Metal-to-metal body-to-bonnet seal in constant compression prevents bonnet thread corrosion, eliminates possible tensile breakage and gives a reliable seal point.Rolled stem and bonnet threads provide additional strength.Dust cover protects stem from lubricant contamination.Packing below threads prevents lubricant washout, thread corrosion, process contamination and eliminates galling.Replaceable soft seat and can operate in dirty service with repetitive bubble-tight shutoff.Easily adjustable PTFE packing decreases replacement downtime and increases valve life.Mirror stem finish in the packing area provides smooth operation and extends packing life.Safety back seating prevents stem blowout or accidental removal and provides a metal-to-metal secondary stem seal while in the fully open position.Straight-through flow path means high flow capacity, bi-directional flow and rodding capabilities.