MIL-DTL-24695C(SH)
4.2.1 Samples for qualification. Samples for the qualification tests shall consist of one vent and test valve, one
adapter, and two hose assemblies for each part number as specified on the applicable specification sheet.
4.2.1.1 Extension of qualification. Qualification of one hose assembly length can be extended to all lengths
provided that the end fittings are identical for each assembly and only the hose length varies. For valves and
adapters whose only difference is the end fitting configuration, qualification can be extended provided a burst
pressure test is conducted.
4.2.2 Test conditions. Unless otherwise specified herein, the hydraulic fluid used for all tests shall conform to
MIL-PRF-17672, 2135TH. The fluid shall be maintained at a minimum temperature of 45 °C (113 °F).
4.2.3 Vent and test valves.
4.2.3.1 Examination. Each valve shall be examined for conformance to the requirements of this specification,
applicable specification sheets, and manufacturer s drawings.
4.2.3.2 Proof pressure (uncapped valve and capped valve).
a. Proof pressure (uncapped valve). The uncapped valve 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,
malfunction, or leakage other than a slight wetting at seals. Proof pressure shall be applied at least two successive
times and held 2 minutes for each pressure application. The valve shall be operated between pressure applications.
The pressure shall be reduced to atmospheric pressure between applications.
b. Proof pressure (capped valve). The male connection of the valve cap and the probe seal in the valve shall
withstand a proof pressure of 465 bars (6,750 lb/in2) without evidence of failure, permanent set, or leakage at the
seal other than a slight wetting insufficient to form a drop. Proof pressure shall be applied once and held for
1 minute. This test may be accomplished on a separate valve with the check valve device removed.
4.2.3.3 Shock. The valve shall be subjected to high-impact mechanical shock tests in accordance with the
requirements for Grade A, subsidiary component, Class I, lightweight, Type B, fixture 4A of MIL-S-901. A valve
shall be considered as having failed the shock test if it does not meet the leakage test of 4.2.3.4, or shows any signs
of external or internal damage when examined in accordance with 4.2.3.1. The valve shall be pressurized to the
maximum operating pressure of 310 bars (4,500 lb/in2) during the test.
4.2.3.4 Leakage (uncapped valve). The valve shall be uncapped and subjected to the operating pressure of
310 bars (4,500 lb/in2). The valve shall then be actuated with the probe and the operating pressure maintained for
2 hours. There shall be no leakage other than a slight wetting of the seal. During connection to the probe, one drop
shall be allowed. The test shall be repeated at 50 percent of the specified operating pressure and at 0.35 bars
(5 lb/in2). The valve shall automatically close after disconnection from the probe without leakage.
4.2.3.5 Leakage (capped valve). The cap shall prevent leakage at 310 bars (4,500 lb/in2) in the event of total
valve failure. This pressure shall be held for 2 hours. During this time, leakage shall be insufficient to form a drop.
This test may be accomplished on a separate valve, with the check valve device removed, at any time in the testing
sequence.
4.2.3.6 Valve operation. The valve inlet shall be pressurized to 310 bars (4,500 lb/in2) and torque required to
connect the hose assembly to the valve shall be measured. The torque shall not exceed the limit specified herein
(see 3.5.1.4). In addition, the valve shall be pressurized to 310 bars (4,500 lb/in2) and operated for 250 open/shut
cycles. This may be accomplished by seating/unseating the valve s internal check or poppet by the hose assembly
probe or equivalent substitute at room temperature. After cycling, the leakage test of 4.2.3.4 shall be performed.
Leakage shall not exceed the limit specified herein (see 3.5.1.5).
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