MIL-DTL-19068B
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temperature at +225 F and no external leakage. The valve shall not be damaged and shall
shuttle satisfactorily at that temperature.
3.12.8 Endurance cycling. The requirements of 3.12.4 shall be met when tested as
specified in 4.6.9.
3.12.9 Shuttling against a closed line. When tested in accordance with 4.6.10, the
pressure drop of the valve from emergency inlet through outlet shall be not greater than 10 times
the maximum allowable pressure drop at rated flow as specified in table II.
3.12.10 Surge flow shuttling. The valve shall not be damaged or malfunction when
tested in accordance with 4.6.11.
3.12.11 Pressure drop. The pressure drop of the test shuttle valve shall be as specified in
table II when tested in accordance with 4.6.12.
3.12.12 Burst pressure. The valve shall withstand a burst pressure at 7,500 psi for 2
minutes without rupture of internal or external parts when tested in accordance with 4.6.13.
There shall be no damage and the valve shall shuttle satisfactorily after the test.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. First article inspection (see 4.4)
b. Conformance inspection (see 4.5)
4.2. Inspection conditions. Unless otherwise specified, all inspections shall be
performed in accordance with the conditions specified herein and SAE-AS8775. If the
requirements conflict between SAE-AS8775 and this specification, the latter shall govern.
4.3 General. The first article and the conformance tests provisions contained in section 4
of SAE-AS8775 are applicable to and form a part of this specification.
4.4 First article inspection. When specified (see 6.2), the first article tests shall be
performed on the applicable specimen by the manufacturer and the activity responsible for the
tests in the order specified in table I. Tests may be supplemented with tests under actual service
conditions at the option of the acquiring activity. In addition to the first article tests, the
manufacturer shall complete an engineering analysis on their valve design showing the valve
shall function at the extreme temperature conditions under all maximum and minimum
clearance. Include the engineering analysis report with the first article test report submitted for
examination and approval.
4.4.1 Test samples. Unless otherwise specified in the contract, the first article test shall
be conducted on two samples.
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