Corporate Information


As a leading comprehensive manufacturer of valves in Japan, Hamai has established a production system for over 5 million valves annually. We develop products with high performance and high added value.

Since being established in 1927, Hamai has supplied high-performance valves to many industries as a comprehensive manufacturer of valves. Our LP gas valves hold the top share in Japan, with a total production of 300 million units. In addition, we develop valve products for a variety of needs, including ball valves and high-pressure valves. Further, we became the first in the industry to enter the field of cutting-edge hydrogen valves that require advanced technology. From Japan to the world, we supply our products globally.


Company name Hamai Industries Limited
Headquarters 7-7-7, Nishigotanda, Shinagawa-ku, Tokyo 141-8512
Tel +81-(0)3-3492-6655
Foundation February 1, 1927
President and CEO: Satoshi Kasai
Managing director and general manager of the Sales Division: Hiroyuki Watanabe
Managing director and general manager of the Production Division : Shinichi Kawamura
Managing director and general manager of the Administrative Division: Shinsuke Yoshimura
Objectives Manufacture and sale of precision machinery
Manufacture and sale of valves
Manufacture and sale of high-pressure gas-related equipment
Real estate rental
All work incidental to the business items mentioned above
Major products
for sale
LP Gas Valves
Ball Valves
High Pressure Valves
Clean Energy Valves
Total number of
issued shares
Capital 395.3 million yen
Stock exchange on which shares of the company are listed: JASDAQ
Securities code: 6497
Number of
332 (August 2021)
Certifications ISO 9001:2015 Quality management systems (QMS)
Certification authority: TUV Rheinland Japan Ltd.

ISO 14001:2015 Environmental management systems (EMS)
Certification authority: ISO Registration Center, High Pressure Gas Safety Institute of Japan
Licenses Ministerial certified factory by types Factory manufacturing products certified by the Fire Equipment and Safety Center of Japan Medical equipment manufacturing approval by the Ministry of Health, Labour and Welfare Medical equipment manufacturing license by the Tokyo Metropolitan Government