Koyo Sangyo

Koyo Sangyo Co., Ltd. is a Japanese manufacturer whose operations center on valves and related products, guided since its founding in 1926 by a policy of quality-first manufacturing that delivers safety and peace of mind through its products. Its business is organized into three categories: gas cocks and gas cords, general and railway industry valves, and production equipment, inspection machines and tooling.

The gas product line spans gas outlets, replaceable fuse-type gas cocks, appliance connection cocks, flexible-tube cocks, service and branch cocks, meter unit assemblies and related parts for city gas and LP gas, searchable by installation location such as kitchens and rooms. Leveraging technology cultivated in gas cocks, the company also supplies waterworks valves and fittings and valves for railway rolling stock including Shinkansen vehicles, alongside high-reliability production equipment, inspection machinery and tools for factories, supported by formal quality and environmental policies.