MIL-DTL-5500G
3.6 Impulse. During the impulse test there shall be no leakage in excess of 1 drop per
10,000 cycles at room temperature or 1 drop per 1,000 cycles at -65°F (-54°C).
3.7 Leakage. The cap shall not leak or malfunction in any manner at all operating
conditions up to the design operating pressure of 5,000 psi at a wrench tightening torque of 15 to
50 inch-pounds when seated on an MIL-PRF-6164 valve stem.
3.8 Identification of product. Each cap shall be permanently marked for identification
with the part number and the manufacturer's name, symbol, or trade-mark in accordance with
MIL-STD-130. This marking shall be placed in the recessed diameter as shown on MS20813.
3.9 Recycled, recovered, or environmentally preferable materials. Recycled, recovered,
or environmentally preferable materials should be used to the maximum extent possible,
provided that the material meets or exceeds the operational and maintenance requirements, and
promotes economically advantageous life cycle costs.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.5).
4.2 Inspection conditions. Unless otherwise specified, all tests required by this
specification shall be made at an atmospheric pressure of approximately 29.92 inches of Hg and
a temperature of 77 °F. When tests are made with ambient pressure or temperature substantially
different from the above values, proper allowance shall be made for the difference from the
specified conditions.
4.2.1 Sampling instructions. Qualification test samples shall consist of 12 caps, 144
square inches of 0.125 inch thick platen press sheets of the seat material compounded as in the
production seat and given an equivalent cure, and detail and assembly drawings. Identify
samples as required.
4.2.2 Preparation of valve caps for qualification inspection. Three caps to be subjected
to qualification tests shall be air-aged in a Geer oven, or equivalent, at 158°±2°F (70°±1°C) for 7
days, and a second group of 3 shall be aged in hydraulic fluid conforming to MIL-PRF-83282
and held at a temperature of 158°±2°F (70°±1°C) in a closed container or reflux condenser for 7
days.
4.3 Qualification inspections. The qualification tests of the caps shall consist of all the
tests specified under Conformance inspections and, in addition, the following tests:
4.3.1 Seat material. The seat material shall be tested in accordance with MIL-PRF-6855.
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