MIL-PRF-23256C
AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)
ASME-B46.1
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Surface Texture (DoD adopted)
(Application for copies should be addressed to the American Society of Mechanical
Engineers, 345 East 47th Street, New York, NY 10017-2392.)
2.4 Order of precedence. In the event of a conflict between the text of this document and
the references cited herein, the text of this document takes precedence. Nothing in this document,
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 Materials. Materials shall be compatible with the nitrogen gas and shall meet the
performance requirements of this specification.
3.2.1 Metal parts. All parts shall be of corrosion-resistant material or treated in such a
manner as to render them resistant to corrosion. Unless protected against electrolytic corrosion,
dissimilar metals shall not be used in close contact with each other.
3.2.2 Protective treatment. Materials used in construction of the seal valve shall be
protected against deterioration when exposed to any environmental conditions which will occur
during service life. Protective coating shall not crack, chip, or scale during normal service life, or
under extremes of environmental conditions.
3.3 Standard parts. Standard parts shall be used wherever possible.
3.4 Design. The seal valve assembly shall provide a positive closure to a receiver, containing
air or nitrogen at a pressure of 3,800 ±100 psig. The inlet port of the seal valve assembly shall
mate with a receiver conforming to MIL-R-81202 and the outlet port shall mate with a control
valve conforming to MIL-V-23254. The seal valve assembly shall operate within a temperature
range of -65°F to 250°F (-54°C to 121°C). The seal valve assembly shall include, but not be
limited to, a seal valve and a filter cartridge assembly.
3.4.1 Seal valve assembly. The seal valve assembly and integral components shall conform
to figure 1 through figure 10 to ensure proper interface with the receiver.
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