MIL-PRF-6164G
(pneumatic), SAE-AS5440 Hydraulic Systems, Aircraft, Design and Installation Requirements
For (hydraulic), and similar systems. The M6164-3 is intended for use where a more extreme
definition of leak-free is required to be verified. The M6164-12 is intended for use where higher
pressure is used or increased durability is needed.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this specification.
b. Classification (see 1.2).
c. Issue of ASSIST to be cited in solicitation, and if required, the specific issue of
individual documents referenced (see 2.2.1 and 2.3).
d. When first article is required (see 3.1).
e. Additional item identification required, if any (see 3.6).
f. Whether the salt fog is waived and material certification is acceptable (see 4.6.8).
g. Packaging requirements (see 5.1).
6.3 Interchangeability. The high pressure air valve classes in this specification are not
interchangeable with each other. A higher pressure valve may be substituted for a lower, but not
the reverse. If a substation is made it should be noted that the charging, discharging and removal
requirements differ.
6.4 Lubrication. SAE-AMS-G-4343 grease and MIL-PRF-6083 hydraulic fluid are proven o-
ring lubricants.
6.5 Leakage test. A light has been used during the leakage tests to aid in detection of gas
bubbles.
6.6 One cycle of opening and closing. One cycle of opening and closing is defined as rotating
the nut CCW until it swivels freely (open) and then rotating the nut CW to the specified torque
(closed).
6.7 Audible pressure warning feature. The audible pressure warning feature is to warn a user
not to loosen the valve body from the boss while under pressure. If not warned, the user can
continue to loosen the valve and the valve could become a projectile injuring the user. A proven
audible pressure warning feature is a slot cut into the valve body threads (.500-20 UNF-3A)
which allows air to escape from the threads when loosened.
6.8 Free swiveling. The free swiveling condition is when the nut is between open and closed
positions and rotates freely.
6.9 First article valves. The first article inspection depletes the usable life of the valve. These
valves should be used only for inspection and reference applications.
6.10 Supersession data. For supersession data see figure 1.
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