Flowserve Durco HF Plug Valves

Durco HF plug valves, such as the G4BZ-HF Marathon Sleeveline series, are engineered specifically for HF alkylation service, delivering reliable bubble tight shutoff and low emissions performance. Built with solid Monel M35-1 bodies and plugs, these non-lubricated quarter-turn valves feature a PTFE sleeve for 360° sealing, Viton O-rings with PTFE backup rings, and Grafoil fire-safe packing for maximum containment. Their in-line adjustability, vented plug design, and North American sourced castings with lifetime warranty make them a durable, cost-effective solution for refineries requiring high-cycle, safety-critical valve performance.