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SENJU SPRINKLER CO., LTD.

Japanese manufacturer of fire sprinkler heads, alarm valves and related fire-extinguishing equipment, part of the Senju Group.

Last updated September 16, 2026

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Overview

Senju Sprinkler Co., Ltd. is a Japanese manufacturer of fire-extinguishing equipment, including sprinkler heads, alarm valves (flow detection devices), deluge valves, foam extinguishing agents and fusible plugs. The company was established on 8 April 1974, when the manufacturing division of Senju Metal Industry Co., Ltd.'s sprinkler department became independent. It is headquartered in Arakawa-ku, Tokyo, and states that it has maintained the top domestic share in Japan for sprinkler heads. It also states that it has obtained product type approvals and quality/environmental international certifications in countries including Japan, the United States, Canada, China and the United Kingdom.

History

In 1963, the company succeeded in developing Japan's first domestically type-approved fire-extinguishing sprinkler head, and for over half a century it has supplied sprinkler heads, related valve products and fusible plugs as a specialist manufacturer. On 8 April 1974, the manufacturing division of Senju Metal Industry Co., Ltd.'s sprinkler department became independent, establishing Senju Sprinkler Co., Ltd. In May 1975, it took over manufacturing and inspection operations from Senju Metal Industry, and the Iwate Factory (Shibajuku) began operations. In April 1986, it opened the Osaka and Fukuoka sales offices and absorbed and merged the sprinkler department (sales division) of Senju Metal Industry, becoming an integrated production and sales company. In February 1989, cumulative sprinkler head production surpassed 10 million units. In July 1990, the Iwate Factory (Marumori) began operations. In July 1991, the Iwate Factory administration building (Jugado) was newly constructed. In April 1994, the company marked its 20th anniversary, and in June 1994 cumulative sprinkler head production surpassed 20 million units.

Products and positioning

Specialist manufacturer of fire-extinguishing sprinkler heads and related valve products, with top domestic share in Japan.

  • Closed-type sprinkler heads

  • Open-type sprinkler heads

  • Head accessories

  • Flow detection devices (alarm valves)

  • Deluge valves

  • End test devices

  • Valves and accessories

  • Foam extinguishing agents

  • Fusible plugs

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