|January 1902||Saw cutting factory founded by Seitaro Okumura in Gamo Town, Shiga Prefecture.|
|August 1952||Transition to a factory specializing in valve cocks with expansions in manufacturing and sales.|
|May 1962||Company name changed to Okumura Engineering Works Co., Ltd..|
|June 1969||Established and moved offices to new head office and factory.|
|November 1975||Completed construction of a large factory for machines.|
|April 1980||Established a new integrated assembly line for butterfly valves.|
|October 1990||Established OKM Valve Malaysia Sdn. Bhd.|
|August 1992||Completed construction of a new factory.|
|April 1993||Company name changed to Okumura Engineering Corporation.|
|October 1997||Acquired ISO 9001 certification.|
|June 1998||Completed construction of a new head office.|
|February 2003||Established the Suzhou Okumura Valve Limited Company in China.|
|December 2008||Moved the Malaysia Factory to a new building.|
|August 2018||Acquired ISO 27001 certification.|
|March 2019||Established Shiga Higashiomi Factory in Higashiomi City, Shiga Prefecture.|
|June 2020||Selected as a"2020 GLOBAL NICHE TOP 100" by the Ministry of Economy, Trade and Industry.|
|October 2020||Established Research and Development Center in Yasu City, Shiga Prefecture.|
|December 2020||Listed on the Second Section of the Tokyo Stock Exchange.|
|February 2021||Moved the Head Office to Yasu City, Shiga Prefecture.|
|May 1967||Developed the Neo Pinch Valve.|
|August 1977||Developed the 515 Butterfly Valve.|
|March 1982||Developed the ML-515 Electronic Butterfly Control Valve.|
|October||Developed the 5400 High-Performance Butterfly Valve.|
|September 1984||Developed the 336D Knife Gate Valve.|
|June 1986||Developed the VAVTROL-S1 Electronically Controlled Air Conditioning Valve.|
|October 1988||Developed the VAVTROL-S2 Electronically Controlled Air Conditioning Valve.|
|July 1992||Developed the 601A Aluminum Butterfly Valve.|
Developed the 615X General-Purpose Butterfly Valve.
Developed the 606F Flange-Type Butterfly Valve.
|June 1993||Developed the Jumbo Butterfly Valve.|
|January 1995||Developed the 336S Knife Gate Valve.|
|November 1997||Developed the 6424 Fire-Safe Butterfly Valve.|
|August 1998||Developed the 622H High-Pressure Butterfly Valve.|
|March 1999||Developed the 607F Flange-Type Butterfly Valve.|
|October||Developed the VAVTROL-DN Electronic Butterfly Valve.|
|June 2000||Developed the 602 Aluminum Die Cast Butterfly Valve.|
Developed the 336J Multi-Seat Type Knife Gate Valve.
|August 2001||Developed the 618H High-Pressure Butterfly Valve.|
|April 2002||Developed the 612X General-Purpose Butterfly Valve.|
Developed the 606K Flange-Type Butterfly Valve.
Developed the 603A Aluminum Die Cast Butterfly Valve (PPS Disc).
Developed the 5410 High-Performance Butterfly Valve.
|April 2004||Developed the 336J Knife Gate Valve.|
|October 2005||Developed the 111S, 110S, 121S, and 120S Wafer Check Valves.|
|August 2006||Developed the 603S and 612S butterfly valves for use with powders.|
|April 2008||Developed a marine hatch rotary sluice valve.|
Developed the 110Z and 120Z Wafer Check Valves.
|March 2010||Developed the 618F | 622F High-Pressure Flange-Type Butterfly Valve.|
|December 2011||Developed the 635N Fluororesin-Lined Butterfly Valve.|
|April 2016||Developed the Exv series of Butterfly Valves for Marine Emission Control System.|
|September 2016||Remodel of the VAVTROL-DN Electronic Butterfly Valve.|
|April 2017||Developed the 637N Fluororesin-Lined Butterfly Valve.|