In Shaoxing Keqiao district, there was a DN 800 gate valve (external leakage planetary gearbox) had serious corrosion of gears and components due to long time in water, even 5 people could not turn it. After on-site inspection, the TVD engineer provided a solution quickly, disassembled, rusted and repaired the key components, and finally successfully restarted the opening and closing function of the valve. TVD engineer has won high recognition from the owner with its professional technical capabilities and efficient after-sales service!