MIL-PRF-25961H
4.6.16 Vibration. The valve shall be mounted rigidly by its mounting provisions on the
vibration table and then exposed to random vibration for 1 hour along each axis. The APSD shall
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be 0.04g /Hz from 15 to 50 Hz and then increased at a rate of ±4 dB per octave to 300 Hz. Next
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the APSD shall be 0.3g /Hz from 300 to 1,000 Hz and then decreased at a rate of 6 dB per octave
to 2,000 Hz. For half the test time, along each axis and with the gas port capped, the valve shall
have 70 to 90 psig applied to the fill outlet and buildup ports. The valve shall meet the leakage
limits specified in 4.6.3 through 4.6.5 while being vibrated along each of the three axis (see 6.8).
4.6.17 Reliability. When required (see 6.2), perform a reliability test. With the valve
connected as specified in 4.6.13.1, the filling cycle in 4.6.13.3 shall be conducted with sufficient
duration to obtain a 90% confidence that an MCBF of 200 cycles has been achieved. The test
also may be used to demonstrate an MCBF of 133 cycles and 99.5% probability of completing a
one-cycle mission. At the conclusion of the reliability testing, the valve shall be subjected to the
tests in 4.6.3 through 4.6.5. There shall be no malfunction preventing the repetition of normal
filling cycles or LOX leakage exceeding maximum limits.
4.6.18 Venting endurance. The CRU-50/A valve shall be connected as specified in
4.6.13.1 and the fill outlet, gas, and buildup ports shall be pressurized to 50 psig. The vent cap
(see 6.10) shall be installed and removed 200 cycles while allowing for venting and
repressurizing the system to 50 psig. When cycling is complete, the valve shall be subjected to
the tests in 4.6.4 and 4.6.6. There shall be no LOX leakage exceeding maximum limits.
4.6.19 Corrosion. The valve, with the ports plugged, shall be subjected to a 50 hour salt
fog test specified in ASTM B117. The valve then shall be examined for corrosion and internal
contamination and subjected to the tests in 4.6.3, 4.6.4, and 4.6.5. Material certification may be
used to demonstrate compliance with the requirement in 3.4.
4.6.20 Compatibility. Nonmetallic materials when tested using ASTM D 2512 shall
demonstrate no reaction when subjected to 98 J impact energy (see 6.5). Material certification
may be used to demonstrate compliance.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified
in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-
house contractor personnel, these personnel need to contact the responsible packaging activity to
ascertain packaging requirements. Packaging requirements are maintained by the Inventory
Control Point packaging activities within the Military Service or Defense Agency, or within the
military
Packaging data retrieval is available from the managing
Military Department or Defense Agency automated packaging files, CD-ROM products, or
by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
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