Operating service time. Equipment shall operate for
a minimum of 10,000 cycles to overhaul without maintenance other than
Performance curves. The valve performance shall be
defined by the following curves which shall be submitted with the qualification
Maximum pressure rise. Curves showing the maximum
pressure rise versus time at each specified inlet condition at sea
Maximum peak pressure. Curies showing maximum peak
pressures and regulated pressures (with allowable tolerance limits) for
a minumum of six inlet pressures greater than the regulated pressure.
Pressure vs. altitude and temperature. Curves
showing variations in pressure rise time and regulated pressure with
altitude and temperature.
Temperature. The valve shall meet the requirements
of this specification over the ambient temperature range specified on
the specification sheet.
Acceleration forces. While mounted rigidly during
nonoperating periods, valves shall be capable of withstanding nonvibratory
linear acceleration forces of 25 g applied at the valve center of gravity
in any direction, without structural damage. Valves shall be capable of
normal operation after exposure to this force.
Vibration. Valves shall be designed to meet the
vibration test requirements specified in 4.5.6 and on the specification
Installation drawing. The manufacturer's installation
drawing shall be approved by the qualifying activity and will form a
part of the qualification test report. Manufacturers interested in
qualifying valves to this specification shall coordinate installation
with the qualifying activity prior to fabrication of qualification