Key Specifications / Parameters Parameter Description / Value Part Number 16A5483X012 Product Type Backup (anti-extrusion) ring Intended Application Used in the trim/seat assembly of sliding-stem control valves, specifically for valves with HPT/HPAT designs Housing/Valve Sizes Applicable to valve sizes NPS 2 to 6 (2″–6″) as listed in the parts list for HPT/HPAT trims. Material Stainless steel (per parts list entry “S31600 (316 SST)” for this part number) Role Acts as a rigid support ring beneath soft or polymer seating materials to prevent extrusion under elevated pressure / temperature service Status / Usage A component to be ordered as part of trim or overhaul kits; used for legacy or replacement service in Fisher HP/HPT valve series
