Stem seals in high-pressure gate valves face dynamic and static challenges. Chevron-style graphite packing stacks provide fire-safe sealing up to 1,200°F. Each V-ring is die-formed and pre-compressed to maintain seal integrity during stem travel. Inverted packing glands allow replacement under pressure in select models. A metal backseat isolates the bonnet cavity during full-open posi... https://globalsealstech.com/