MIL-PRF-25675C
4.4
Inspection conditions.
4.4.1
Test fluid. The test fluid used during testing shall conform to MIL-H-5606 or MIL-H-83282. The test fluid
shall be filtered continuously through a 15-micron absolute filter.
Temperature. Unless otherwise specified, the tests shall be performed at an ambient temperature of 70° to
4.4.2
90°F and a test fluid temperature of 70° to 110°F.
4.4.3
Valve axis position. Unless otherwise specified, tests may be made with the valve axis in either a horizontal
or vertical position. For the vertical position the inlet port shall be positioned so that the force of gravity shall act with
the valve checking action (i.e., direction of flow is up).
4.4.4
Immersion. Prior to performing any tests, except examination of product, the valve shall be immersed in
450° ± 5°F test fluid for 72 hours. All internal parts shall be in contact with the fluid during this period. After
immersion, the valve shall remain in ambient temperature test fluid until ready for tests. The valve shall not be
exposed to air for more than 24 hours between tests.
4.5
Requirements cross-reference matrix. Table II provides a cross-reference matrix of the section 3 requirements
tested or verified in the paragraphs below.
TABLE II. Requirements cross-reference matrix
Requirement
Verification
3.1
4.2
3.3
4.6.1, 4.6.17, 4.6.18
3.4.1
4.6.1
3.4.2
4.6.1, 4.6.18
3.4.3
4.6.1
3.5
4.6.9, 4.6.10, 4.6.11, 4.6.14
3.6.1
4.6.2
3.6.2
4.6.3
3.6.3
4.6.4, 4.6.5
3.6.4
4.6.6, 4.6.7
3.6.5
4.6.8
3.6.6
4.6.12
3.6.7
4.6.13
3.6.8
4.6.15
3.6.9
4.6.16
3.6.10
4.6.1
4.6
Tests.
4.6.1
Examination of product. The valve shall be examined to determine compliance with materials, dimensions,
markings, and weight.
Proof pressure. After the valve has reached 450° ± 5°F, the valve shall have flow applied in both the free-
4.6.2
flow and reverse-flow directions at least 2 successive times in each direction. During each flow, a proof pressure of
4,500 (+150, -0) psi shall be applied and held for 2 minutes. For the reverse-flow direction, the poppet shall be
unseated between applications of the proof pressure. There shall be no evidence of damage or deformation.
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