MIL-PRF-25675C
4.
VERIFICATION
4.1
Classification of inspections. The inspection requirements specified herein are classified as follows:
a. Qualification (see 4.2).
b. Conformance inspection (see 4.3).
4.2
Qualification inspection. Qualification inspections shall be performed on two valves. One valve shall be
subjected to tests indicated in 4.2.1 and the other valve to tests indicated in 4.2.2.
4.2.1
Minimum dimension test sample. One test sample shall be assembled of parts whose dimensions are at the
minimum of the tolerance range. This test sample shall be subjected to the following tests in the following order:
a.
Examination of product (4.6.1).
b.
Leakage (4.6.4).
c.
Proof pressure (4.6.2).
d.
High temperature (4.6.11).
e.
Repeated assembly (4.6.16).
f.
Salt-fog (4.6.17).
g.
Final examination (4.6.18).
4.2.2
Maximum dimension test sample. The second test sample shall be assembled of parts whose dimensions are
at the maximum of the tolerance range. This test sample shall be subjected to the following tests in the following
order:
a.
Examination of product (4.6.1).
b.
Proof pressure (4.6.2).
c.
Surge flow (4.6.3).
d.
Repeated assembly (4.6.16).
e.
Vertical leakage (4.6.5).
f.
Checking time (4.6.6).
g.
Cracking pressure (4.6.7).
h.
Pressure drop (4.6.8).
i.
Low temperature (4.6.9).
j.
Intermediate temperature (4.6.10).
k.
High temperature (4.6.11).
l.
Endurance (4.6.12).
m.
Vibration (4.6.14).
n.
Flexural strength (4.6.15).
o.
Burst pressure (4.6.13).
p.
Final examination (4.6.18).
4.3
Conformance inspection. Each valve shall be subjected to the tests below:
a.
Examination of product (4.6.1).
b.
Proof pressure (4.6.2).
c.
Vertical leakage (4.6.5).
d.
Cracking pressure (4.6.7).
e.
Final examination (4.6.18).
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