Ishigaki Company, Ltd.

Ishigaki Company, Ltd. (株式会社 石垣) is a Japanese plant-engineering and manufacturing company headquartered in the Marunouchi district of Chiyoda-ku, Tokyo. Its corporate philosophy is expressed as "responding to trust with technology" (「信頼に技術で応える」), and its business is organized around technologies related to water. The company describes itself as a plant-engineering manufacturer supporting water infrastructure and industry, and it serves both water-environment fields and industrial fields through three business segments: environmental machinery, pumps, and industrial machinery. The environmental machinery segment draws on experience in water and sewage infrastructure to propose optimization solutions aimed at energy saving, CO2 reduction, and cost reduction. Its product range includes filter presses (such as the ISD/ISF, ISDG, and IMD/IMF Lath Filter series), screw presses (ISGKV, ISGKD, ISGK IV, ISGK III, and the ISGK EXPRESS mobile dewatering vehicle), belt presses (IVP Lath Belt Press), centrifugal dewatering machines, sludge thickeners, high-speed filtration equipment, combined-sewer-overflow water-quality improvement equipment, and chemical dissolving equipment. The pumps segment integrates fluid technology to supply various pumps for social infrastructure, including vertical and horizontal mixed-flow and axial-flow pumps, screw-equipped mixed-flow pumps such as "Pulse Spin" and "New Pulse Spin," submersible pumps including the "Flood Buster" full-speed, full-water-level horizontal submersible pump, and related starters. The industrial machinery segment focuses on solid-liquid separation technologies that are difficult for other companies, offering filter presses and filtration machines to solve customer problems. Ishigaki was founded in 1958 and states that it has continued to advance with technological development capability at its core, contributing to society through environmental preservation. The company maintains a nationwide Japanese network: its head office and Tokyo branch are in Marunouchi, Tokyo, with branches in Tohoku (Sendai), Nagoya, Osaka, Chugoku (Hiroshima), Shikoku (Takamatsu), and Kyushu (Fukuoka). Its manufacturing and development operations are concentrated in Kagawa Prefecture, including the Sakaide Office/Sakaide Plant, the Development Center, and the Hayashida Plant. It also operates sales offices in Hokkaido, Hokuriku, Wakayama, Yamaguchi, Kumamoto, and Kagoshima. Beyond equipment, Ishigaki engages in sustainability and corporate-social activities, including quality and environment initiatives, next-generation development, promotion of women's participation, DX efforts, and environmentally conscious materials procurement, and it publishes a sustainability report. Its news and events include naming-rights facilities for Kagawa National College of Technology, a sponsored game for the B.League basketball team Kagawa Five Arrows, participation in the Japan International Seafood Show, and product debuts at the Tokyo Sewerage Exhibition. The company also provides after-sales service information, including notices of service termination for certain products.

Ishigaki Company, Ltd. was founded in 1958. According to its corporate information, the company has continued to advance with technological development capability at its core since its founding, contributing to society through environmental preservation. Its business is built around technologies related to water, and it describes itself as a plant-engineering manufacturer supporting water infrastructure and industry. Over the decades, Ishigaki developed and commercialized a broad range of water-treatment and dewatering machinery. Its environmental machinery line includes the Lath Filter filter press family (ISD/ISF, ISDG, and IMD/IMF types), screw presses (ISGKV, ISGKD, ISGK IV, ISGK III, and the ISGK EXPRESS mobile dewatering vehicle), the IVP Lath Belt Press, centrifugal dewatering machines, sludge thickeners, high-speed filtration equipment, combined-sewer-overflow water-quality improvement equipment, and chemical dissolving equipment. Its pump line spans land and submersible pumps, including vertical and horizontal mixed-flow and axial-flow pumps, screw-equipped mixed-flow pumps such as "Pulse Spin" and "New Pulse Spin," and the "Flood Buster" full-speed, full-water-level horizontal submersible pump with its dedicated "EG Starter." Its industrial machinery segment applies solid-liquid separation technologies to industrial filtration challenges. The company established a nationwide Japanese structure. Its head office and Tokyo branch are located in the Marunouchi Kitaguchi Building in Chiyoda-ku, Tokyo. It operates branches in Tohoku (Sendai), Nagoya, Osaka, Chugoku (Hiroshima), Shikoku (Takamatsu), and Kyushu (Fukuoka), and sales offices in Hokkaido, Hokuriku, Wakayama, Yamaguchi, Kumamoto, and Kagoshima. Its manufacturing and development base is in Kagawa Prefecture, comprising the Sakaide Office/Sakaide Plant, the Development Center, and the Hayashida Plant. In recent years, Ishigaki has emphasized sustainability and corporate social responsibility, covering quality and environment, next-generation development, promotion of women's participation, DX initiatives, and environmentally conscious materials procurement, and it publishes a sustainability report. It has also engaged in community and promotional activities, including naming-rights facilities for Kagawa National College of Technology, a sponsored game for the B.League team Kagawa Five Arrows, participation in the Japan International Seafood Show, and product launches at the Tokyo Sewerage Exhibition. The company provides after-sales service information, including notices of service termination for products such as the direct-coupled water supply booster pump unit and the water jet business.

• 2026

  Unveiled two new products at the Tokyo Sewerage Exhibition 2026.

• 2016

  Notice of termination of after-sales service for the direct-coupled water supply booster pump unit.

• 2015

  Notice of transfer of the water jet after-sales service business.

• 1958

  Ishigaki Company, Ltd. founded.

Plant-engineering manufacturer supporting water infrastructure and industry, offering water-related technologies across water-environment and industrial fields.

• ISD/ISF Lath Filter filter press

  High-pressure squeezing performance; cloth-traveling / all-chamber simultaneous opening type.

• ISDG Lath Filter filter press

  High-speed processing and space saving; cloth-traveling / all-chamber simultaneous opening type.

• IMD/IMF Lath Filter filter press

  For slurries with good dewaterability; fixed-cloth / sequential opening type.

• ISGKV hybrid screw press

  Achieves even lower moisture content; hybrid system combining thickening and dewatering sections.

• ISGKD direct screw press

  Directly dewaters unthickened sludge.

• ISGK IV high-efficiency screw press

  High efficiency and high performance; energy saving and space saving.

• ISGK III screw press

  Press-in type outer-cylinder rotating screw press; energy-saving, compact high-performance dewatering machine.

• ISGK EXPRESS mobile dewatering vehicle

  Mobile dewatering system equipped with ISGK screw press; goes where needed when needed.

• IVP Lath Belt Press

  Continuous dewatering to limit moisture with high-pressure squeezing belt mechanism; continuous filtration dewatering / belt pressurization type.

• Centrifugal dewatering machine

  Energy saving through reduction of polymer flocculant.

• Sewage sludge-derived fiber utilization system "Platinum System"

  Converts hard-to-dewater sludge into gentler sludge; innovative system achieving improved dewaterability.

• IGKT differential rotation screw thickener

  Compact, low-power, high-performance sludge thickener.

• IFW high-speed fiber filter

  Rapid filtration machine using fiber filter media; upward-flow / high-speed fiber filtration type.

• ISW Super high-speed filter

  Rapid filtration machine using granular floating filter media; upward-flow / floating media filtration type.

• High-speed fiber filtration equipment for combined sewer water quality improvement

  Achieves cost reduction and space saving through high-speed filtration.

• Rotary screen for CSO countermeasures

  High-performance rotary screen for CSO countermeasures.

• IDPD disk-type polymer flocculant rapid continuous dissolving device

  Dramatically improves work efficiency and realizes an on-demand environment.

• IDFV vertical mixed-flow pump

  Supports various specifications.

• PSRV "Pulse Spin" vertical screw-equipped mixed-flow pump

  Ishigaki pump achieving both foreign-matter passage and high efficiency.

• IAFV vertical axial-flow pump

  Low-head, large-capacity vertical pump.

• IDFH horizontal mixed-flow pump

  Large-capacity horizontal pump for pumping and drainage.

• IAFH horizontal axial-flow pump

  Low-head, large-capacity horizontal pump.

• IDVV vertical volute mixed-flow pump

  Vertical pump combining features of mixed-flow and volute types.

• ISR suction screw-equipped volute pump

  Single-vane pump achieving non-clogging and high efficiency.

1. 1株式会社 石垣ishigaki.co.jp
2. 2企業情報 | 株式会社 石垣ishigaki.co.jp
3. 3製品情報 | 株式会社 石垣ishigaki.co.jp
4. 4事業所一覧 | 株式会社 石垣ishigaki.co.jp
5. 5Ishigaki Company, Ltd. (Japan) - Wikidatawikidata.org