MIL-DTL-23953D, DETAIL SPECIFICATION: VALVES, COMBINED VENT-CHECK, FOR SUBMARINE MBT BLOW LINES (SIZES 2.00 AND 2.50 INCHES) (11-FEB-2014) [SUPERSEDING MIL-V-23953C]

MIL-DTL-23953D, DETAIL SPECIFICATION: VALVES, COMBINED VENT-CHECK, FOR SUBMARINE MBT BLOW LINES (SIZES 2.00 AND 2.50 INCHES) (11-FEB-2014) [SUPERSEDING MIL-V-23953C]., This specification covers the construction, testing, and operation of combined vent-check valves with a nominal pressure seating of 4,500 pounds per square inch gage (psig), for use in submarine main ballast tank (MBT) high-pressure air blow lines (sizes 2.00 and 2.50 inches).