MIL-PRF-9050G
3.5.2 Leakage. The valve shall not leak at a rate greater than 0.01 liter per minute (LPM) when
subjected to an internal pressure at the minimum operating pressure of the valve (see 1.2) and
after establishing a 15 LPM flow through the valve.
3.5.3 Flow capacity. The valve shall have a minimum gas flow rate of 100 LPM at the
maximum operating pressure (see 1.2).
3.5.4 Sustained flow. The valve shall withstand a gas flow rate of 100 LPM for 1 hour without
chatter (see 6.6).
3.5.5 Endurance. The valve shall withstand 5,000 endurance cycles of operation. For each
endurance cycle, the valve shall be pressurized from below the minimum operating pressure to
the maximum operating pressure and back to below the minimum operating pressure (see 1.2).
The valve shall seat each time at the minimum operating pressure.
3.5.6 Overpressure cycling. The valve shall be pressurized from below the minimum operating
pressure to a pressure of 50 psig above the maximum operating pressure and back to below the
minimum operating pressure (see 1.2). This shall constitute one overpressure cycle. The valve
shall not leak at a rate greater than 0.01 LPM after the 5th, 15th, and 25th pressurization cycles.
3.5.7 Orientation. The valve shall operate in any orientation.
3.5.8 Tamper-proof relief pressure setting mechanism. The valve shall be equipped with a relief
pressure setting mechanism which shall be tamper-proof.
3.5.9 Inlet filter. The inlet of the valve shall have a 75 micron filter or screen to prevent foreign
material from entering the valve.
3.6 Environmental conditions.
3.6.1 Temperature. The valve shall operate between LOX exposure temperatures and 265° ±
5°F.
3.6.2 Vibration. The valve shall withstand resonant frequencies as shown in table I (see 6.9)
and cycling frequencies between 5 and 500 Hz at an applied double amplitude of 0.036 inch or
an applied acceleration of ±10g.
TABLE I. Vibration data
Frequency (Hz)
Displacement in double amplitude (inch) and
acceleration (g), if applicable
5-10
0.080
10-10.9
±0.41g (0.080 to 0.067)
10.9-16.2
0.067
16.2-18.6
±0.9g (0.067 to 0.051)
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