| 出生地 |
Sichuan China (Mainland) |
| 牌子的名字 |
Greatwall |
| 模式的数量 |
customized |
| 标准或Nonstandard |
Nonstandard |
| 风格 |
O戒指 |
| 材料 |
橡胶 |
Patent products designed by the company, improving Glyd rings and Step seals significantly by replacing pressure compensating o-ring with u-ring and changing single sealing line into multiple sealing lines, resulting in no leakage under high/low pressures at a line speed below 8m/s.