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MIL-V-5527A
(May 1951)
3.2.8  Snap Rings .- Snap Rings, if used, shall be used in accordance with the
requirements of Specification MIL-H-5440.
3.2.9  Pressure Adjustment Screws.- Pressure adjustment screws shall be so designed
and constructed that they may be locked to prevent loosening under vibration. It shall
be possible to adjust and lock the adjustable screws with a standard wrench or screw driver.
The adjustment means shall be such that the pressure adjustment can be made under pressure
with no loss of hydraulic fluid during the adjustment. Standard recessed hex head (Allen
type of equivalent) steel adjustment screws may be uses in sizes up to 1/2-inch hex socket
size.
3.2.10  Flow Rate.- The relief valve shall by-pass fluid, or have a minimum rated
flow of 15cc per minute at 110 percent of the cracking pressure.
3.3  Interchangeability.- All parts having the same manufacturer part number shall
be directly and completely interchangeable with each other with respect to installation and
performance. Changes in manufacturer's part numbers shall be governend by the drawing number
requirements of Specification MIL-D-5028.  Sub-assemblies, composed of selected mating
components, must be interchangeable as assembled units, and shall be so indicated on the
s
manufacturer drawing.  The individual components of such assembled units need not be
interchangeable.
3.4  Weight.- The weight shall be held to a minimum consistent with the requirements
of this specification.
3.5
Finish.-
3.5.1  Aluminum-Alloy Parts.- Unless otherwise specified, all aluminum-alloy parts,
except those in constant contact with hydraulic fluid shall be inodized in accordance
with the requirements of Specification AN-QQ-A-696.
3.5.2  Steel Parts.- Unless otherwise specified, all steel or copper-alloy parts,
except those in constant contact with hydraulic fluid, shall be cadmium-plated in accord-
ance with Specification QQ-P-416, type I Class B, or chrome-plated in accordance with
Specification MIL-P-6871.  Cadmium plating may be used in contact with hydraulic fluid
provided there is no rubbing or abrasion on the surfaces to which it is applied.  Surfaces
in sliding contact with each other may be chrome-plated.
3.5.3  No finishes or paints} other than those specified above, or color markings
specified herein or otherwise authorized by the Services, shall be applied to the valves
either externally or internally prior to installation in the airplane.
3.6 Magnetic Inspection.-  All magnetizable, highly stressed parts of the valve
shall be subjected to magnetic inspection in accordance with Specification MIL-I-6868.
Where necessary, such inspection shall be called for on the manufacturers drawing. Cracks
or other injurious defects disclosed by magnetic inspection shall be cause for rejection
3.7 Changes.- No changs shall be made in the assembly or detail part of an AN
approved valve without obtaining prior approval from the Qualifying Agency and notifica-
tion of such approval from the Aeronautical Standards Group.
3.8 Performance.- Valves shall satisfy the Performance tests specified in Section 4,
under paragraphs headed as follows and shall be conducted in the order listed below:
Immersion
(a)
Proof Pressure
(b)
Static Leakage
(c)
Dynamic Leakage and Flow
(d)
Extreme Temperature Operation
(e)
Endurance
(f)
Burst Pressure
(g)
4

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