Nakakita Seisakusyo Co., Ltd.

Nakakita Seisakusyo Co., Ltd. is a Japanese manufacturer of valves and fluid control systems, headquartered in Daito, Osaka. Founded in 1930 by Benzō Nakakita as a private venture producing automatic control valves, the company was incorporated in 1937 and has since grown into a specialist supplier of valves for marine and power generation applications. Its product range includes automatic control valves, safety valves, butterfly valves, and other fluid control equipment used in ship engine rooms, diesel engines, and power plants. The company is recognized as a major player in the marine valve sector in Japan. Nakakita Seisakusyo operates a head office and factory in Daito, Osaka, with sales offices in Tokyo and Kitakyushu. It has expanded internationally, establishing subsidiaries such as ACE VALVE CO., LTD. in South Korea (acquired in 2024) and Nakakita (Wuxi) Industrial Technology Co., Ltd. in China. The company is listed on the Tokyo Stock Exchange Standard Market, having originally listed on the Osaka Securities Exchange in 1971. Its corporate philosophy emphasizes "progress and development" (進取発展) and a commitment to one-stop service from design and manufacturing to maintenance of fluid control systems. The company's history reflects Japan's industrial development, from its designation as a Navy-managed factory during World War II to its post-war expansion into commercial shipbuilding and energy sectors. Today, Nakakita Seisakusyo continues to focus on valve technology, with recent initiatives in branding and technology development to address changing market needs.

Nakakita Seisakusyo was founded in May 1930 by Benzō Nakakita in Matsugae-cho, Kita-ku, Osaka, as a private enterprise manufacturing automatic control valves. In May 1937, the business moved to Imai-cho, Kita-ku, Osaka, and was reorganized into a company. In June 1939, it relocated to Gamo-cho, Joto-ku, Osaka, with capital of 1 million yen. During World War II, in May 1942, the company was designated as a Navy-managed factory and ordered to produce valves for transport ships. After the war, Nakakita Seisakusyo resumed its sales network, reopening the Tokyo sales office and establishing a Kyushu branch in January 1950. In August 1955, it received a research grant from the Ministry of Transport for research on desuperheaters. In March 1958, it received financing from the Japan Development Bank based on designation under the Specific Machinery Promotion Act, allowing it to invest in new machine tools and inspection equipment. Capital was increased to 28 million yen in December 1958 and to 35 million yen in December 1959. In May 1959, the company celebrated its 30th anniversary and purchased land in Daito City for factory expansion. Construction of the Daito Factory began in June 1960, with the first phase completed in November 1960 and the second phase in October 1961. Capital was increased to 56 million yen in October 1962. In June 1963, it received a science and technology research grant from the Ministry of Transport for research on rubber-lined butterfly valves. In November 1965, following the death of founder Benzō Nakakita, Hiroshi Nakakita became the second president. In March 1968, the company obtained high-pressure gas second-class certification. In the 1970s, capital was increased to 112 million yen in January 1970. In May 1970, the new Daito factory was completed, consolidating production from the main factory. In June 1971, the company received approval for welding methods under the Electric Utility Industry Act. In December 1971, capital was increased to 370 million yen and the company listed its shares on the Osaka Securities Exchange. In December 1972, a new head office building was completed within the Daito factory, and head office operations were relocated there. Capital was further increased to 600 million yen in December 1973, to 1 billion yen in December 1974, and to 1.15 billion yen in June 1975. In May 1976, the scope of high-pressure gas ministerial certification was expanded. In January 1979, the company was certified by the American Society of Mechanical Engineers (ASME) to use the V and UV stamps for safety valves. In the 1980s, Nakakita Seisakusyo introduced a production management system (NAPS) using a large computer in March 1985, and a design OA system (NADAS) with CAD in June 1988. In January 1989, it installed advanced machine tools including machining centers. In the 1990s, it continued to modernize, updating to robot-equipped MC/NC machine tools in April 1993, and networking CAD and electronic files in August 1994. In September 1994, it obtained ISO 9001 certification from LRQA for its quality system for product design and manufacturing. In February 1997, Osamu Nakakita became the third president. In May 1999, it introduced a three-dimensional measuring machine, and in June 1999, it rebuilt its electronic filing system. In July 2013, following the integration of the Osaka and Tokyo stock exchanges' cash equity markets, the company's shares were listed on the Tokyo Stock Exchange Second Section. In December 2024, it acquired ACE VALVE CO., LTD. in South Korea as a subsidiary. The company continues to operate as a specialist in valves and fluid control systems, with a head office and factory in Daito, Osaka, and sales offices in Tokyo and Kitakyushu.

• Benzō Nakakita starts manufacturing automatic control valves in Kita-ku, Osaka.

• Reorganized into a company and moved to Imai-cho, Kita-ku, Osaka.

• Moved to Gamo-cho, Joto-ku, Osaka, with capital of 1 million yen.

• Designated as a Navy-managed factory and ordered to produce valves for transport ships.

• Reopened Tokyo sales office and established Kyushu branch.

• Received research grant from Ministry of Transport for desuperheater research.

• Received financing from Japan Development Bank under Specific Machinery Promotion Act.

• Increased capital to 28 million yen.

• Celebrated 30th anniversary and purchased land in Daito City for factory expansion.

• Increased capital to 35 million yen.

• Started first phase construction of Daito Factory.

• Completed first phase of Daito Factory and began machine work operations.

• Completed second phase of Daito Factory as assembly plant.

• Increased capital to 56 million yen.

• Received science and technology research grant for rubber-lined butterfly valve research.

• Hiroshi Nakakita became second president after death of founder.

• Obtained high-pressure gas second-class certification.

• Increased capital to 112 million yen.

• Completed new Daito factory, consolidating production from main factory.

• Received approval for welding methods under Electric Utility Industry Act.

• Increased capital to 370 million yen and listed on Osaka Securities Exchange.

• Completed new head office building within Daito factory and relocated head office functions.

• Increased capital to 600 million yen.

• Increased capital to 1 billion yen.

Specialist manufacturer of valves and fluid control systems for marine and energy applications, emphasizing one-stop service from design to maintenance.

• Automatic control valves

• Safety valves

• Butterfly valves

• Marine valves

• Power plant valves

• Fluid control systems

1. 1株式会社中北製作所 公式サイトnakakita-s.co.jp
2. 2沿革｜株式会社中北製作所nakakita-s.co.jp
3. 3会社案内｜株式会社中北製作所nakakita-s.co.jp
4. 4製品紹介｜株式会社中北製作所nakakita-s.co.jp
5. 5中北製作所 - Wikipediaja.wikipedia.org
6. 6Nakakita Seisakusyo - Wikidatawikidata.org