MIL-PRF-9439F
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful,
but is not mandatory.)
6.1 Intended use. The valves covered by this specification are intended for use in high-
pressure, fixed and portable, aeronautical oxygen systems for filling and controlling the flow
from these systems.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Item identification and valve size.
c.
Packaging requirements (see 5.1).
d.
If the conformance inspection sampling inspection level is other than normal
(tightened or reduced) (see 4.3).
e. The requirement for the vendor to identify proposed cleaning and verification
methods (see 4.6.3).
f. Whether the salt fog test is waived and material certification is acceptable (see
4.6.14).
g. When first article is required (see 3.1).
6.3 Cleaning. See MIL-STD-1330 and SAE-ARP1176 for guidance on proven cleaning
methods and verification. Visible inspections are typically conducted using white light and
ultraviolet light to detect particulates and some types of hydrocarbon. The non-volatile residue
test in SAE-ARP1176 may be used to baseline the hydrocarbon verification at an acceptable
contamination level, however, other cleaning and verification methods that do not contain class I
and II ODC solvents should be used for production.
6.4 Flow test. A proven procedure to maintain inlet and outlet pressure as specified is to
use a pressurized surge tank at both the inlet and outlet to stabilize flow.
6.5 Lubrication. MIL-PRF-27617 (type III) is a lubricant proven compatible with pure
oxygen.
6.6 SLPM. One SLPM is equal to one liter of flow per minute at a pressure of 760
millimeters of mercury at the temperature of 0oCelsius.
6.7 Siphon tube. A previously acceptable design of this valve had a siphon tube, with
radially distributed holes, installed to prevent any foreign matter within the cylinder from being
carried into the valve.
6.8 Internal isolation device. A previously acceptable design of this valve used a metal
diaphragm to separate the threaded handwheel shaft from the internal moving components. The
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