MIL-DTL-24695C(SH)
4.2.3.7 Vibration. The valve shall be pressurized and subjected to Type I (environmental vibration) vibration
tests in accordance with MIL-STD-167-1 for the frequency of 4 to 50 Hertz. The valve shall be tested in each of
three mutually perpendicular axes. However, if a component is symmetrical about a principal axis, vibration testing
need only be accomplished along two orthogonal axes, one of which shall be the principle axis of symmetry. For
the last axis tested, the valve cap shall not be installed. Any of following conditions resulting from vibration shall
constitute failure of this test:
a.
Damage to parts.
b.
Loosening of parts (including cap).
c.
External leakage of one drop or more from the uncapped valve.
d. Loosening (unscrewing) of the valve when the cap is removed [for vibration test, installation torque applied
for installing valve shall be 11-13.5 Newton meters (99-121.5 inch-pounds) which is one-half the normal torque
value of 22-27 Newton meters (198-243 inch-pounds)].
4.2.3.8 Burst pressure. Pressure shall be applied to the valve at a rate not to exceed 1,725 bars (25,000 lb/in2)
per minute until 620 bars (9,000 lb/in2) burst pressure is obtained. After this pressure has been held for 2 minutes,
the valve shall show no sign of rupture or permanent deformation. The pressure may be further increased to
determine the actual burst pressure.
4.2.3.9 Valve flow rate. It shall be demonstrated that the vent and test valve, when connected to the hose
assembly and adapter, provides a minimum flow rate of 250 milliliters (15.3 in3) per minute at a differential pressure
of 10 bars (145 lb/in2). Minimum hose length shall be 915 millimeters (36 inches).
4.2.4 Hose assembly.
4.2.4.1 Examination. Each hose assembly shall be examined for conformance to the requirements of this
specification, applicable specification sheets, and manufacturer s drawings.
4.2.4.2 Proof pressure. The hose assembly shall withstand a proof pressure of 620 bars (9,000 lb/in2) without
evidence of permanent deformation or external leakage. The proof pressure shall be applied at least twice and held
for 2 minutes at each application. The pressure shall be reduced to atmospheric pressure between applications.
4.2.4.3 Flexibility. The hose assembly shall be pressurized to the 310 bars (4,500 lb/in2) operating pressure.
The assembly shall be flexed to the minimum bend radius of 40 millimeters (1.57 inches), and the pressure increased
to the applicable proof pressure. Pressure shall be reduced to atmospheric pressure, and the test repeated. Any
evidence of permanent deformation or leakage shall constitute failure of this test.
4.2.4.4 Leakage. The hose assembly shall be subjected to the 310 bars (4,500 lb/in2) operating pressure with
each end connected to either a MIL-DTL-24695/l vent and test fitting or a MIL-DTL-24695/3 adapter. After
2 hours there shall be no evidence of leakage.
4.2.4.5 Burst pressure. Pressure shall be applied to the hose assembly at a rate not to exceed 1,725 bars
(25,000 lb/in2) per minute until the 1,240 bars (18,000 lb/in2) burst pressure is obtained. After this pressure has been
held for 2 minutes, the hose and end fittings shall show no sign of leakage. Following this verification, either the
pressure shall be further increased to determine the actual burst pressure or other action shall be taken to render the
hose assembly unfit for use.
4.2.5 Adapters.
4.2.5.1 Examination. Each adapter shall be examined for conformance to the requirements of this
specification, applicable specification sheets, and manufacturer s drawings.
4.2.5.2 Proof pressure. The adapter shall withstand a proof pressure of 465 bars (6,750 lb/in2) applied to the
inlet with the outlet port blocked without evidence of permanent deformation or damage.
4.2.5.3 Leakage. The adapter shall be subjected to the 310 bars (4,500 lb/in2) operating pressure. After 2 hours
there shall be no evidence of leakage.
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