Clow Valve Co.
American manufacturer of waterworks valves and fire hydrants.
Last updated September 2, 2026
Overview
Clow Valve Company produces waterworks valves and fire hydrants in Oskaloosa, Iowa. For more than 130 years, Clow Valve has been servicing its customers as one of the United States' premiere manufacturers of iron valves and hydrants for the waterworks industry. Clow Valve is proud to be a part of the McWane companies.
History
Clow Valve Company’s roots date back to 1878. Then known as James B. Clow & Sons, the company was a jobber of wrought iron pipe and other foundry products. In 1890, Clow added fire hydrants and waterworks valves to its line by becoming a distributor for the Eddy Valve Company of Waterford, N.Y. In the 1940s, Clow purchased the Eddy Valve Company and the Iowa Valve Company of Oskaloosa, Iowa. In 1972, Rich Manufacturing Company of Corona, Calif., was acquired. In 1985, McWane, Inc. purchased all of Clow Corporation’s stock, and Clow became a wholly owned subsidiary. In 1996, the Waterworks Division of Long Beach Iron Works was acquired by Clow. Today, Clow Valve Company operates at two locations: Oskaloosa, Iowa, and Riverside, Calif.
Products and positioning
Product categories. waterworks valves · fire hydrants
Sources
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