Jul.1955	Founded as a diaphragm valve manufacturer with a capital of 10million yen
Mar.1958	Opened Osaka Branch Office
Aug.1958	Became a group company of Sankyo Co., Ltd.
Sep.1959	Opened Nagoya Sales Office
Mar.1961	Opened Kitakyushu Sales Office
Jan.1963	Acquired Yoshida Seisakusho Co., Ltd. and reopened as Osaka Plant
Jan.1965	Started marketing ball valves
Dec.1967	New headquarters and main plant were built at current site
May.1969	Tokyo Valve Industry Co., Ltd. was founded
Sep.1970	Opened Okayama Sales Office
Apr.1975	Acquired Tokyo Valve Industry Co., Ltd. and reopened as Tokyo Plant
Dec.1978	Tokyo plant acquired certification under High Pressure Gas Safety Act
Dec.1980	Opened Tokyo Sales Office and Osaka Sales Office
Dec.1981	Started marketing butterfly valves
Aug.1989	Integrated Tokyo plant into Head Office
May.1994	Integrated Tokyo Sales Office into the Headquarters
Apr.1995	Established Overseas Sales Department (now International Sales Department)
Apr.1999	Acquired ISO 9001 Certification
Oct.2000	Opened Osaka Manufacturing Center
Apr.2005	Became a group company of Seika Corporation
Sep.2006	Founded Tianjin Daiya Valve Co., Ltd. in PRC
Mar.2008	Acquired ISO 14001 Certification
Aug.2013	Opened TDV Shanghai Office
Mar.2015	Opened NDV (Thailand) Co., Ltd.
Nov.2022	Tianjin Daiya Valve Co., Ltd. Head Office Plant was newly constructed and moved to the current address