MIL-PRF-25961H
6.1 Intended use. The valve covered by this specification is used to control the flow of
gaseous oxygen in the pressure buildup and vent circuits and the flow of LOX in the fill circuit
of oxygen converter systems of 70 and 300 psig operating pressure.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Item identification
c. When reliability testing is required (see 4.6.17).
d. The requirement for the vendor to identify proposed cleaning and verification
methods (see 4.6.2).
e. Packaging requirements (see 5 and 6.9).
f. When verification inspection is required (see 4.2.1).
6.3 Qualification. The attention of the contractors is called to the requirements with
respect to products requiring qualification. Award will be made only for products which are, at
the time of award of contract, qualified for inclusion in the Qualified Products List (QPL No.
25961) whether or not such products have actually been listed by that date. In order that the
manufacturers may be eligible to be awarded contracts or purchase orders for the products
covered by this specification, they are urged to arrange to have the products that they propose to
offer to the Federal Government tested for qualification. Information pertaining to qualification
of products may be obtained from Oklahoma City Air Logistics Center/ENEP, 3001 Staff Drive,
Suite 2AG-68A, Tinker AFB, OK 73145-3036.
6.4 SLPM. One SLPM is equal to one liter flow at a pressure of 760 millimeter of
Mercury at the temperature of 0° Celsius per one minute.
6.5 Nonmetallic materials. For additional guidance selecting nonmetallic materials for
use with LOX see ASTM G63. A proven nonmetallic material for usage with LOX is
polytetrafluoroethyene (Teflon). Materials that are pre-certified to meet the 98 J threshold of
ASTM D 2512 do not require demonstration.
6.6 Cleaning. See MIL-STD-1330 and SAE-ARP 1176 for guidance on proven cleaning
methods and verifications. Visible inspections are typically conducted using white light and
ultraviolet light to detect particulates and some types of hydrocarbons. The non-volatile residue
test in MIL-STD-1359 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.
6.7 Sampling. For sampling guidance see Table II.
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