March 1953 Founder Tokuichi Yokoyama opened a laboratory in Shibuya, Tokyo, and started trial manufacture and research of control valves.
February 1957 Established a stock company with capital of 1 million yen under the name of "TOKO Laboratory Co., Ltd." at 2, Hirai, Edogawa-ku, Tokyo.
April 1958 Developed a patented control valve for acid resistance.
September 1971 Established the Osaka office to expand the market to the west of Kansai area.
August 1972 Released V-5000 Series.
December 1977 Certified as a facility for valves for high-pressure gas by the Minister of International Trade and Industry.
September 1979 Increased the capital to 20 million yen.
October 1980 Established Fukushima Factory in Iwaki, Fukushima.
July 1982 Constructed a clean room in Head Factory to begin full production of valves for space development.
April 1984 Established "TOKO Laboratory Engineering Service Co., Ltd." (the present Valex Engineering Co., Ltd.) to expand the service.
August 1988 Iwao Yokoyama assumed the post of president, and Tokuichi Yokoyama assumed the office of chairman.
December 1988 Increased the capital to 30 million yen.
August 1989 Expanded Fukushima Factory to complete the T-8000 process line.
February 1991 Reached a total production of 100,000 globe control valves.
August 1992 Renamed the company as "TOKO VALEX CO., LTD.", introducing CI.
February 1998 Acquired ISO 9001 Quality Management System certification.
August 2000 Delivered various control valves to the nuclear fuel reprocessing facility.
May 2001 Reached a total delivery of 3,000 ultra-low-temperature valves for liquid helium.
October 2001 Delivered large sized (350A) globe control valves to JNC.
April 2004 The company becomes Eco-Action 21 (EA21) certified registered company.
August 2005 Developed a control valve for moisturizing paper machine rollers.
June 2006 Delivered liquefied helium gas relief valves to the neutrino low-temperature facility, J-PARC.
August 2008 Tatsuya Yokoyama assumed the post of president, and Iwao Yokoyama assumed the office of chairman.
July 2009 Set up an agency in China.
June 2010 Started development of valves for rocket engines using LNG as fuel.
January 2011 Succeeded in combustion testing of the LNG rocket engine fitted with our valves.
May 2013 Established Shanghai office.
Nov 2020 Closed Shanghai office.
Nov 2020 Established “TOKO VALEX TRADING (SHANGHAI) CO., LTD.”