甲山製作所 Company Profile

We meet our customers' expectations with technology and quality.

Koyama Manufacturing Co., Ltd. is engaged in business activities aimed at "contributing to society and humanity, as well as the happiness of employees and their families." The fundamental mindset that serves as a guideline for this behavior is "friendship and cooperation." We strive to empathize with and support not only our customers but also everyone involved with the company, sharing both joys and hardships together. We manufacture and sell hydraulic valve assemblies, earthquake-resistant precision valve components, and our own developed chamfering machine designs.