Loss Coefficient of Large Bore Valves

Abstract

The loss coefficient of valve is the important factor on design of piping system, and various test results were reported in the past. However, the coefficient depends on the construction, type and size of valve. The reports by The Ship-Machinery Manufacturers' Association of Japan on 1960 and 1961 clarified the loss coefficients of JIS F marine globe valves, angle valves and sluice valves of small size up to 130 mm bore. In this paper, test results of the loss coefficients of currently used 200 mm bore globe valves and sluice valves complied with JIS F for marine use and JIS B for land use, and butterfly valve for city water service are reported, and relation of coefficient of various valves are discussed.