Shanghai Trasun Mechanical Seals and metal bellow Manufacture Co., Ltd. Is the largest Chinese professional designer & manufacturer of mechanical seal for pump, auto compressors and can replace the similar products of John Crane and Burgmann. Since 1998, we consistently demonstrated our passion for its reputation as a reliable and stable manufacturer of superior quality products and passed ISO9001, ISO14001 & ISO/TS16949, becoming the appointed OEM suppliers of famous domestic and overseas enterprises, 80% products are exported to outside and receive respected honor. In order to supply better and quick communication & service platform for worldwide customers, we set up the sales branch office in Guangzhou. 
 (Chinese: Chong Shang metal bellows mechanical seals and Manufacturing Co., Ltd., founded in 1998, is a manufacturing conglomerate. Specializing in the production of light duty mechanical seals, metal bellows mechanical seals, and other alternative Crane Company and Bo Bergman's similar products, 80% of world exports, and number of family and domestic well-known European and American enterprises to provide supporting services. 
 Chong is still zero-metal bellows seal and mechanical Manufacturing Co., Ltd. based in Shanghai, China established Songjiang Industrial Park, a product research and development centers, product testing center, storage and logistics products shipped three centers. Our products are widely used in petroleum, chemical, paper, power, water treatment and other industrial fields. )