MIL-PRF-8622C
Government specifications and standards. Materials selected shall be compatible with oxygen
fluid and shall meet the requirements of this specification.
3.2.1 Metal parts. All metal parts shall be of corrosion-resistant material or treated to resist to
corrosion. Material for metal parts shall be selected in accordance with ASTM-G94 for oxygen
compatibility of metals.
3.2.1.1 Dissimilar metals. Unless protected against electrolytic corrosion, dissimilar metals shall
not be used. The dissimilar metals shall be in accordance with MIL-STD-889.
3.2.2 Nonmetallic materials. Nonmetallic materials that are adversely affected by continued use
with oxygen shall not be used. Material for nonmetallic parts shall be selected in accordance with
ASTM-G63 for oxygen compatibility of nonmetallic materials. Nonmetallic parts, wetted by
oxygen, shall be resistant to auto-ignition, and shall have the lowest practicable heat of
combustion in accordance with ASTM-G63. Additionally, where nonmetallic parts are installed,
the design shall minimize the surface area and volume exposed to oxygen.
3.2.2.1 Age control. Because of the mechanical properties of elastomer are sensitive to
temperatures, elastomer components except silicones shall be treated for protection from the
environmental conditions such as moisture and extreme temperatures. The integral elastomer
components shall be operable throughout the life of the valve. The shelf life of the elastomer
components shall be determined by the acquisition activities (see 6.2).
3.2.2.2 Elastomer components. Elastomer components shall be composed of an ozone-resistant
composition which shall not swell and shall meet the ozone-resistant requirements specified
herein (see 4.5.12).
3.2.3 Protective treatment of materials. Materials used shall be protected against environmental
deterioration. Protective coatings that may crack, chip, or scale during normal service life or
under extreme environmental conditions shall not be used.
3.2.4 Surface finish. All machined surfaces shall be smooth, free of pits and discontinuities; such
as, scratches or breaks and shall be uniform in appearance. Surface roughness shall be in
accordance with ASME-B46.1.
3.2.5 Lubricants. Lubricants shall not be used within the normal flow path of oxygen.
Lubricants shall be in accordance with MIL-G-27617, Type III and shall have been tested for
compatibility with gaseous oxygen in accordance with ASTM-G72.
3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials shall 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 costs.
3.4 Design and interface requirements. The design and interface requirements of the valve shall
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