MIL-DTL-5523E
3.12.1 Government procured and indirect shipment. Government procured and indirect shipment such as spare
valves shall be tagged with a tag containing the following:
NOTICE
Valve requires pressure setting adjustment. Valve will be set by means of a power-driven pump to deliver rated flow
(2.5, 7, 12, and 32 GPM minimum for dash 4, 6, 8, and 12, respectively) at the differential pressure required by the
specific application (see applicable manual [+25, -0 psi for class YZ, +50, -0 psi for Class AB and +100, -0 psi for
class CD]), with a return port back pressure of 200 ± 25 psi for class AB and CD valves only. This pressure setting
shall be impressed on a lead seal, or equivalent attached to the lockwire of the unit. As the pressure adjustment is
altered, this seal will be destroyed and replaced with a new seal properly stamped with new pressure setting. When
emergency circumstances dictate, the valve may be set with a hand pump to first flow at the minimum rate of 1.5 cc
(30 drops) per minute, at the pressure of 95 percent of the specified setting value. Remove tag when pressure
setting has been completed.
3.13 Workmanship. Valves shall be free from cracks, laps, seams, burrs, longitudinal and spiral tool marks, or any
other defects that may detrimentally affect their intended use (see 4.5.4.1).
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 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient
accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained
or identified by the contractor. The establishment and maintenance of a calibration system to control the accuracy of
the measuring and test equipment shall be in accordance with ISO 17025 and NCSL Z540.3 as applicable.
4.3 Inspection conditions. Unless otherwise specified, all inspection shall be performed in accordance with the test
conditions specified in 4.3.1 in this specification.
4.3.1 Test fluids. First article inspections shall be performed with oil conforming to MIL-PRF-5606, MIL-PRF-83282
or MIL-PRF-87257. Acceptance tests shall be performed with oil conforming to MIL-PRF-5606,
MIL-PRF-83282, MIL-PRF-87257 or MIL-PRF-6083.
4.3.2 Filtration. The test fluid shall be continuously filtered in order to obtain SAE International Class 3 contamination
limits (or better), in accordance with SAE AS4059 for contamination limits, specified as follows:
Size (Microns)
Particle Count Per 100 Milliliters
5-10
24000
10-25
5360
25-50
780
50-100
110
100-Up
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4.3.3 Temperatures. Except where otherwise specified, the test of this specification shall be performed at room
temperature (70 to 90 degrees Fahrenheit) and an oil temperature of 70 to 100 degrees Fahrenheit. The actual
ambient temperatures shall be recorded.
4.4 First article inspection.
4.4.1 Test sample. The test sample consists of three valves of classes YZ, AB, and CD of each size fabricated in
accordance with manufacturer's drawings. The valves shall be identified with the manufacturer's PIN and such other
information as required by the qualifying activity. The valves shall be prepared as follows:
4.4.1.1 Minimum clearance specimen. One specimen shall be assembled of parts which have been selected to
provide that the clearance with regard to linear and diametrical tolerances between moving and nonmoving members,
conducive to malfunctioning at extreme temperatures, shall not exceed 110 percent of the minimum designed
clearance permitted by the manufacturer's drawings. For cases of sliding parts where packing friction would
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