MIL-PRF-25962F
3.5.8 Reliability. The mean cycles between failures (MCBF) of the valve shall be not
less than 1,000 cycles (see 4.5.8 and 6.2).
3.6 Cleanliness. All surfaces shall be free of visible particulates (50 microns and larger),
free of visible fluorinated lubricants, and free of hydrocarbon contamination to a level not greater
than 3 milligrams per square foot (mg/ft2) (see 4.5.9 and 6.5).
3.7 Interchangeability. All parts having the same manufacturer's part number shall be
functionally and dimensionally interchangeable.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 Qualification inspection. If required (see 3.1 and 6.3), qualification shall be
performed on four valves. The four valves shall be subjected to all the tests in 4.5.
4.3 Conformance inspection. Conformance inspection shall include the individual tests
(see 4.3.1) and the sampling tests (see 4.3.2).
4.3.1 Individual tests. Each valve shall be subjected to the following tests:
a. Examination (see 4.5.1).
b. Cleanliness (see 4.5.9).
c. Outlet port leakage (see 4.5.3).
4.3.2 Sampling tests. Two valves selected at random from each lot not greater than 500
shall be subjected to the following sampling tests:
a.
Flow rate (see 4.5.2).
b.
High temperature operation (see 4.5.4).
c.
Low temperature operation (see 4.5.5).
d.
Overall leakage (see 4.5.7).
4.4 Inspection conditions.
4.4.1 Temperature and pressure. Unless otherwise specified, tests shall be conducted at
ambient atmospheric conditions.
4.4.2 Test medium. Gas used in testing shall conform to SAE-AS8010, Type I; air
referencing BB-A-1034 for guidance only, Grade A or C; nitrogen conforming to A-A-59503,
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