MIL-DTL-5523E
3.4.7 Retainer rings. Except where they are positively retained form being dislodged from their grooves, retainer or
snap rings shall not be used in any location where failure of the ring will allow blow-apart of the valve caused by
internal pressure. Neither shall they be used in locations where the buildup of clearances and manufacturing
tolerances will allow destructive end play in the assembly contributing toward failure of packings or gaskets,
brinelling, or fatigue failure of parts. For retainer ring applications other than those where retention of hydraulically
pressurized parts is involved, such as locking in place nonpressurized end caps, etc., rings shall be in accordance
with MS16625 and MS16624, or other approved designs. The rings shall be capable of being installed and removed
with standard Pin-type pliers, or other standard tools developed for use with the specified rings.
3.4.8 Function-adjustment screws. Function-adjustment screws shall be so designed and constructed that they can
be positively locked to prevent loosening under vibration or flow. It shall be possible to adjust and lock the adjustable
screws with a standard wrench or screw driver, and in addition, lock wire may be used to insure positive lock, if
required. Where practicable, the adjustment means shall be such that the adjustment can be made under full system
pressure with negligible loss of fluid during the adjustment. Standard countersunk hex head (Allen type or equivalent)
steel adjustment screws may be used in sizes up to 0.50 inch hex. For pressure adjustment screws, a suitable seal,
permanently marked with the pressure setting, shall be attached to the lock wire.
3.4.9 Structural strength. The valves shall have sufficient strength to withstand all loads or combinations of loads
resulting from hydraulic pressure, temperature variations, actuation or operations, and torques loads for connection of
tube fittings.
3.4.10 Rated flow capacity. The rated flow shall be as specified in table II and the applicable detail standard.
3.4.11 Pressure drop at rate flow. Pressure drop at rated flow shall not exceed the values specified herein and the
applicable detail standard.
3.4.12 Fluid connections.
3.4.12.1 Bosses. All internally thread bosses for connecting fittings and SAE AS5169 plugs shall conform to
SAE AS5202. Bosses shall be made sufficiently deep or shall incorporate fitting stops to prevent damage to internal
mechanism or restriction of fluid flow when universal fittings are screwed into the bosses to excessive depths.
3.4.12.2 Fluid connection marking. All ports for tube connections shall be clearly and permanently marked to
indicate the connections to be made using nomenclature in accordance with MIL-STD-130. Where applicable, the
directions of flow shall be indicated. The use of abbreviations should be avoided, but if used shall be the general
industry accepted abbreviations as applicable for the marking. Use of a single letter for marking such as "P" for
pressure and "C" for cylinder is not acceptable. Decalcomanias shall not be considered a permanent marking.
3.4.12.3 Plugs. All plugs, except permanently installed plugs that will not have to be removed during the life of the
component, shall conform to SAE AS5169 for type I systems.
3.4.13 Alignment. All plungers, poppets, balls, pistons, etc., shall be accurately guided to prevent misalignment or
chattering on their seats.
3.5. Performance.
3.5.1 Proof pressure. The valve shall withstand the proof pressure specified in table II without malfunction or
leakage, when tested in accordance with 4.4.2.3.1 for qualification inspection.
3.5.2 Burst pressure. The valve shall not leak, rupture, or fail at any pressure below the minimum burst pressure
3.5.3 Normal temperature performance. There shall be no evidence of external leakage when tested in accordance
3.5.4 Extreme temperature performance. There shall be no evidence of external leakage when tested in accordance
with 4.4.2.5.
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