MIL-PRF-6164G
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article inspection. First article inspection shall be performed on ten valves of each
class and shall consist of installing valves as specified in 4.4.3, pre-torqueing them as specified
in 4.4.4, and then subjecting them to all the tests in 4.6 except 4.6.2.2. The test in 4.6.8 is
required when specified in the acquisition document (see 6.2). All valves subjected to first article
inspection shall not be delivered (see 6.9).
4.3 Conformance inspection. Conformance inspection shall consist of the following tests:
a. Examination (see 4.6.1)
b. Leakage (see 4.6.2.2)
4.4 Test conditions.
4.4.1 Temperature and pressure. Unless otherwise specified in the individual test description,
tests shall be conducted at ambient temperature and pressure.
4.4.2 Test medium. Unless otherwise specified in the individual test description, the gas used
for testing shall be compressed air conforming to BB-A-1034, Grade B or nitrogen conforming
to A-A-59503, type I, Class I, Grade B.
4.4.3 Valve installation.
4.4.3.1 O-ring. SAE-AMS-P-83461/1 O-ring shall be used. The valve O-ring shall be
lubricated (see 6.4) before installing the valve into the boss.
4.4.3.2 M6164-2 through M6164-5 valves. The M6164-2 through M6164-5 shall have the cap
removed before installing, finger tight, into SAE-AS5202 boss. MS33651 may be used for
installation guidance. The valve body shall be torqued to 120 ± 5 inch-pounds. The nut shall be
opened to a free swiveling condition (see 6.8).
4.4.3.3 M6164-12 valve. The M6164-12 valve shall have the cap removed before installing into
SAE-AS5202 boss rated for 8,000 psig applications. The MS33651 boss may be used for
installation guidance but is only rated for a maximum 5000 psig. The valve body shall be
torqued to 120 ± 5 inch-pounds. The nut shall be opened to a free swiveling condition (see 6.8).
4.4.4 First article pre-torque. All first article valves shall have the nut pre-torqued to 120 +5
inch-pounds two successive times before beginning tests in 4.6.3. The nut shall be opened to a
free swiveling condition (see 6.8) after each torque application and remain attached to the valve
body. This pre-torque does not apply to valves subjected to conformance inspection.
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