MIL-DTL-5523E
4.5 Conformance inspection. Conformance inspection shall consist of individual tests and sampling tests,
4.5.1 Individual tests. Each valve is to be furnished under contract and shall be subjected to:
a. Examination of product. (4.5.4.1)
b. Normal temperature performance. (4.5.4.2)
4.5.2 Sampling tests. Valves up to 2 percent of the contract may be selected for any other tests which the inspector
considers necessary to determine conformance with the requirements of this specification.
4.5.3 Rejection and retest. When an item selected from a production run fails to meet the specification, no items still
on hand or later produced shall be accepted until the extent and cause of failure have been determined and
appropriately corrected. The contractor shall explain to the Government representative the cause of failure and the
action taken to preclude recurrence. After correction, all the tests shall be repeated.
4.5.4 Test method.
4.5.4.1 Examination of product. Each valve shall be carefully examined to determine conformance with the
requirements of this specification for design, weight, workmanship, marking, conformance to applicable drawings, and
for any visible defects. The manufacturer's drawings and the manufacturer's applicable specifications which were
submitted when qualification approval was granted, shall be used by the inspector, as necessary, to determine that
the valves submitted for acceptance under contract are identical to design when submitted for qualification.
4.5.4.2 Normal temperature performance. Unless otherwise specified, the valve shall be subjected to its rated flow
by means of a power-driven pump at the maximum pressure settings specified in table II, with a back pressure at the
outlet port of 200 psi, for class AB and CD valves only, and the pressure differential between the ports observed.
This is the setting pressure. The pressure shall then be reduced to the reseat pressure specified for its class in
table II, and the outlet port opened for observation of leakage. This pressure shall be maintained constant and the
leakage observed during the third minute. Leakage shall not exceed that specified in table III. The pressure shall
then be increased slowly until a leakage equivalent to 3 times the value specified in table III is noted. The pressure at
this value shall be not less than 91 percent of the rated flow pressure.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order
(see 6.2). W hen packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel
need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are
maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the managing Military
Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory).
6.1 Intended use. The relief valves covered by this specification are intended for use in aircraft hydraulic systems,
whose normal operations are covered by SAE AS5440, to provide for relief of excessive pressure and should not be
used with any hydraulic fluid other than that conforming to MIL-PRF-5606, MIL-PRF-83282 or MIL-PRF-87257,
unless otherwise specified by the procuring activity.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification.
b. Applicable government and manufacturer's PIN.
c. Level of packaging and packing required (see section 5).
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