MIL-PRF-38201D
however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3.
REQUIREMENTS
3.1
First article. When specified (see 6.2), a sample shall be subjected to first article
inspection in accordance with 4.2.
3.2
Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided
that the material meets or exceeds the operational and maintenance requirements, and promotes
economically advantageous life cycle cost.
3.3
Materials. All materials shall be suitably treated to resist corrosion due to electrolytic
decomposition and any other atmospheric conditions that may be encountered during operational
use or storage. The use of toxic chemicals, hazardous substances, or ozone depleting chemicals,
(ODCs) shall be avoided, whenever feasible.
3.3.1 Aluminum and aluminum alloys. Aluminum and aluminum alloys, if used, shall be
anodized (see 6.4) or have an alternate coating with equivalent characteristics (see 6.2).
3.4
Design. The CRU-59/E valve shall provide a positive leak-tight connection with a
CRU-50/A valve conforming to MIL-PRF-25961 for use in filling a liquid oxygen converter
from a liquid oxygen charging cart. The valve shall contain a poppet (see 6.5) that is normally
seated, preventing a flow through the valve, and shall be automatically unseated when two valves
are completely connected. Complete connection of the two valves shall require a two-phase
operation. The valves shall be connected mechanically without flow through the valves in the
primary phase. The secondary phase shall incorporate suitable actuation by one of the valves, to
allow the flow of liquid oxygen. Disconnection shall not be necessary to cease flow. Suitable
means, such as reverse rotation shall be incorporated to stop flow. If rotation is used, the amount
required to actuate or cease flow shall not exceed 100 degrees. When the two valves are
completely disconnected, the valve shall automatically return to its neutral position ready for
reconnection. The valve used for interface and testing of the CRU-59E valve shall be the CRU-
50/A valve conforming to MIL-PRF-25961 previously qualified under the applicable Qualified
Products List.
3.4.1 Valve sealing. The mating of the valves shall form an effective leaktight connection
which shall resist inadvertent disconnection due to the minor shocks and jars associated with
filling operations.
3.4.2 Internal seals. The internal seals of the valve assembly shall be designed in such a
manner that the entrapment of liquid oxygen cannot take place between screw threads, if used,
and sealing surfaces.
3.4.3 Closures. All openings of the valve shall be closeable with plugs, caps, or similar devices
that shall prevent dust and any foreign matter from entering the valve when not in use.
3
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