三協製作所 Company Profile

A specialized manufacturer of automatic control valves that custom-makes various types of automatic adjustment valves primarily for marine applications, as well as for plants and equipment.

Our company is a specialized manufacturer of various automatic control valves, including automatic adjusting valves, power-assisted control valves, safety valves, relief valves, float switches, float gauges, and solenoid valves, all produced to order. Since our founding in 1946, we have consistently operated as a specialized manufacturer in the field of automatic control valves, including various types of valves and gauges. Our history is a testament to our countless achievements in swiftly and accurately responding to the frontline needs of various industries, including shipbuilding, steel, machinery and equipment, power, oil, chemicals, textiles, air conditioning, and trading companies. With the accumulated know-how and advanced technology, we meet more sophisticated needs. High-pressure gas manufacturing certified business, certification number [MAB-323-N-1] ISO 9001 certified business, certification body [DNV-GL] Various ship classification type approvals: LR, NK, NV, GL, BV Membership organizations: Japan Marine Industry Association Japan Valve Manufacturers Association Osaka Chamber of Commerce and Industry Osaka Pipe and Equipment Commercial Cooperative Association