Guangzhou Research Institute of Machinery (Guangzhou Machinery Institute) has successfully completed 13 meters in diameter, circumference of 42.7 meters large trial polyurethane seals and packing shipments.

The seal is provided by the Three Gorges hydropower turbine group of seals, a single set of values more than 30 million yuan. It is the production of Guangzhou, the maximum size of mechanical seals hospital, is currently the largest size of ring, showing the hospital in the "large, sophisticated, special, special-shaped" rubber sealing production of leading domestic level.