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Page Title:
Selection of specification and standards |
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|  MIL-V-18318B
Selection of specification and standards - Specifications and
3.3.
standards for necessary commodities and services not specified herein shall be
selected in accordance with MIL-STD-143.
M a t e r i a l s - Materials shall conform to applicable specifications
3.4
and shall be as specified herein and on applicable drawings. Materials which are not
covered by specifications, or which are not specifically described herein, shall be
of the best. quality, of the lightest practicable weight, and suitable for the purpose
intended.
Metal parts - All metal parts shall be of a corrosion-resistant
3.4.1
material or treated in a manner to render them adequately resistant to corrosion.
Dissimilar metals - Unless suitably protected against electrolytic
3.4.1.1
corrosion, dissimilar metals shall not be used in intimate contact with each other.
Dissimilar metals are defined in MS33586.
Nonmetallic materials - Any nonmetallic material that is
3.4.2
adversely affected by continued use with oxygen shall not be used.
Age - Elastomer components, except silicone, shall not be more
3.4.2.1
than 12 months old from the cure date of manufacture to the date of delivery to any
Government Service or to any airframe or accessory manufacturer.
Protective treatment - When materials are used in the con-
3.4.3
struction of the valve that are subject to deterioration when exposed to environmental
conditions likely to occur during service usage, they shall be protected against such
deterioration in a manner that will in no way prevent compliance with the performance
requirements of this specification. Protective coating which might crack, chip, or
scale during normal service life or under extremes of environmental conditions shall
not be used.
Standard parts - MS and AN standard parts shall be used
3,5
s
where they suit the purpose, They shall be identified on the manufacturer drawings
by their part numbers, Parts which are not covered by specifications or military
standards. or which are not specifically described herein or on the drawings, shall
be completely described on manufacturer's drawings,
Design and construction - The pressure
regulating valve
3.6
shall be designed in accordance with Figure 1. The valve shall
be capable of reducing
inlet pressures, up to 2,000 psi, to low pressures at the outlet.
An adjustable
pressure reduction control shall be provided for pre-setting the
outlet pressure to a
predetermined fixed pressure within the range of 70 to 400 psi.
4
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