Valve sealing surface maintenance procedures

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Grinding steps 1, rough grinding 2, fine grinding 3, fine grinding 4, polishing 5, grinding Recommended consumables ZrO2 full resin sandpaper 80# SiC full resin sandpaper 120#150# SiC full resin sandpaper 180#, 240#SiC full resin sandpaper 320#, 400#, 600#SiC Grinding Paste 1000# Operation Purpose: Grind out deep grooves and pits on the valve sealing surface. Scratches on the abrasive cloth during rough grinding. Inspect the sealing surfaces of medium and low-pressure valves. Inspect the sealing surfaces of medium- and low-pressure valves. Check for "Verline" marks. Check for scratches on the sealing surfaces of high-pressure valves and all safety valves. Discover and prevent cracks and penetration scratches from grinding the mating surfaces of cone stop valves and safety valves against each other. Check Vertical Line seals.