MIL-V-2042E, MILITARY SPECIFICATION: VALVES, REDUCING, WATER SERVICE FOR NAVAL SHIPBOARD USE (06 JUN 1990) [S/S BY ASTM-F1370]., This specification covers self-contained globe, pressure reducing valves for use in water systems aboard Naval ships and in marine environments. These valves are limited to discharge pressure setting os 200 pounds per square inch (lb/in2) and below. Guidance in the selection and installation of these valves is contained in MIL-HDBK-227.