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valves provide positive shutoff that can be verified by opening the cavity between the two blocks.
See MIL-HDBK-1022A for recommended locations.
Figure 3.5. DBB Valve.
3.5.3. Ball valves (Figures 3.6 and 3.7) are used as quick shut-off (block) valves in applications such
as piping to hydrant outlets, between pump and header, and between pump header and F/S. They are
a suitable replacement for lubricated and non-lubricated plug valves.