Model: NOV 98290 Upper Stem Liner
Material: High strength alloy steel, surface hardening treatment
Application: Wash pipe assembly of NOV Varco TDS-9SA / TDS-11SA top drive
Function: Wear-resistant sliding surface for wash pipe packing seals
Working medium: Drilling fluid, mineral lubricant
Operating temperature: -40℃ ~ +120℃
Feature: Mud erosion resistance, low friction, anti-abrasion
Installation: Upper section of rotary wash pipe assembly
