MIL-DTL-24630A(SH)
TABLE II. Qualification and conformance inspections.
Qualification 1/
Requirement
Test method
Sample 1
Sample 2
Inspection
Conformance
paragraph
paragraph
(maximum
(minimum
clearance)
clearance)
Visual, mechanical, and
X
X
radiographic inspection
External
X
X
X
Internal
X
X
X
Interchangeability
X
X
Maintainability
X
Pressure drop at rated flow
X
capacity
Proof pressure
X
X
X
Leakage
X
X
X
Operation
X
X
Checking time
X
X
Cracking pressure
X
X
X
Temperature extremes
X
Endurance
X
X2/
Fatigue rating
Salt spray
X
Vibration
X
Shock
X
Structureborne noise
X
NOTES:
1/
For the purpose of qualification, a valve of the next smaller or larger size may be used to fulfill the
requirement for two samples.
2/
While tests can be conducted on a single sample, additional samples allow reduction in test pressure.
4.2.1 Test specimens. Qualification tests shall be conducted in accordance with the following criteria:
a. Qualification of a specific size valve can be extended to the next larger and the next smaller size by
similarity. For example, if a 1-inch NPS valve is qualified, then the ¾-inch NPS and the 1¼-inch NPS valve of the
same design may be qualified by similarity.
b. Qualification tests shall normally be conducted on at least two specimens of each size valve, manufactured
to the adverse dimensions of 4.2.1.1 and 4.2.1.2. However, qualification tests may be conducted on a single
specimen manufactured to nominal dimensions when approved by the qualifying activity based on an engineering
analysis, which shows that the valve will operate as required with adverse tolerances. When a single specimen is
tested for qualification, the tests for sample 2 shall be conducted in addition to the tests for sample 1. Tests that are
the same for both samples need not be repeated when a single sample is tested.
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