MIL-V-81356A, MILITARY SPECIFICATION: VALVE, FUEL SYSTEM PRESSURIZATION AND VENT (01 DEC 1975)

MIL-V-81356A, MILITARY SPECIFICATION: VALVE, FUEL SYSTEM PRESSURIZATION AND VENT (01 DEC 1975)., This specification covers one type of valve assembly for use in aircraft fuel tanks to sense and relieve positive or negative tank pressures and control pressurization and venting of the tank during fuel transfer and refueling operations.