Hamai Industries Ltd. engages in the manufacture and sale of precision machinery, compressed gas valves, and high pressure gas equipment. It operates through the Valves and Real Estate Leasing business segments. The Valves business segment manufactures and sells liquefied petroleum gas valves, ball valves, high pressure gas cylinder valves, and precision machinery. The Real Estate Leasing business segment deals with the leasing of real estate properties. The company was founded by Sakae Hamai on February 1, 1927 and is headquartered in Tokyo, Japan.