MIL-DTL-23953D(SH)
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Valve assembly type (see table I).
c.
Parts designated for traceability number marking (see 3.7.3).
d.
Packaging (see 5.1).
e.
Test and inspection reports including all required data (see table IV).
f.
Additional spare parts and seals (see 6.3).
g.
Specific control of processed materials and certification thereof (see 6.6).
6.3 Provisioning. Provisional Technical Documentation (PTD), spare parts, and repair parts should be
furnished as specified in the contract (see 6.2). When ordering spare parts or repair parts for the equipment covered
by this specification, the contract should state that such spare parts and repair parts should meet the same
requirements and verification and documentation provisions as the parts used in the manufacture of the equipment.
Packaging for such parts should also be specified.
6.4 Qualification. With respect to products requiring qualification, awards will be made only for products
which are, at the time of award of contract, qualified for inclusion in Qualified Products List QPL No. 23953
whether or not such products have actually been so listed by that date. The attention of the contractors is called to
these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the
Federal Government tested for qualification in order that they may be eligible to be awarded contracts or orders for
the products covered by this specification. Information pertaining to qualification of products may be obtained from
Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160,
Washington Navy Yard DC 20376-5160 or emailed to CommandStandards@navy.mil. An online listing of
products qualified to this specification may be found in the Qualified Products Database (QPD) at
6.4.1 Provisions governing qualification. Copies of SD-6, "Provisions Governing Qualification" may be
obtained using the ASSIST Online database at https://assist.dla.mil.
6.5 Drawings. Drawings which illustrate or describe pressure boundary components as defined in 3.7.3 should
be stamped or labeled, "Material Identification Control," in or near the title block.
6.6 Objective quality evidence (OQE). Certification should be identified through a unique traceability number,
heat-lot number, or heat-treat number, as applicable, which must also be marked on the material (see 3.7.3). This
traceability number marked on the material should provide direct traceability to the material's chemical composition
and mechanical properties certification data (see 6.2).
6.6.1 Mechanical properties certification. OQE providing certification of two mechanical properties of the
material used in the fabrication of all vent-check valves should be provided. When the mechanical properties of the
material used in the fabrication of a valve are altered by metal working processes or heat treatment, sample material
from each lot of material, as defined in the material specification, should be subjected to tensile tests in the final heat
treated condition for the valve. As a minimum, tensile tests should determine ultimate strength, percent reduction in
area, percent elongation, and hardness. The tensile tests should be conducted on test samples machined from the
heat treated material or from a piece of parent stock which had been heat treated in the same batch in the lot
processed at the same time. Acceptance criteria for the mechanical properties should be in accordance with the
material specification or as approved by the design review agency. In no case should ductility of less than
10-percent elongation in 2 inches be allowed.
6.6.2 Chemical composition certification. OQE providing certification of the chemical test results for each heat
of material and the specific heat treatment (including temperature and holding time) to which each sating was
subjected should be provided. This certification should list both chemical test results and specification
requirements.
6.7 Patent notice. Where the government has limited rights in the data shown on the drawings as determined
by the contractual provisions regarding rights in technical data, the drawings may be marked with a legend. If used,
the "Limited Rights Legend" of FAR should be used.
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