year 1999 1999.Registered Changjiang Valve Factory.

year 2004 2004.Registered Zhejiang Yadeng Valve & Fittings Co., Ltd.

year 2005 2005.Obtain ISO9001 Certification, ISO14001 Certification, OHSAS18001 Certification, TS-A1 Certification, Special equipment test certificate etc.

year 2006 2006. Registered Shanghai Changkai Valve Co., Ltd

year 2013 2013. Registered Tanggong Valve Group Co., Ltd

year 2016 2016.Established a research and development center and obtained 20 utility model patents

year 2017 2017.Obtain API-6D Certification, API607 Certification, API624 Certification, STL Certification, Ce certification, CCC certification, Health licensing certification, measurement management system certification(AAA) etc..

year 2018 2018.Build butterfly valve workshop

year 2019 2019.Now has 1,287 employees and more than 1,000 sets of manufacturing equipment.