MIL-DTL-25427B
considered external leakage. Both coupling halves shall seal fluid under low and high operating
pressures.
3.5.3 Seals. SAE-AMS-P-83461 packing, MIL-P-25732 packing, and
SAE-AS8791 PTFE retainer shall be used which are compatible with MIL-PRF-5606,
MIL-PRF-83282, or MIL-PRF-87257 hydraulic fluids.
3.5.4 Operation. The coupling shall be so designed that it can be coupled and uncoupled
with one hand without the use of tools. Coupling and uncoupling operations shall be possible
with 60 psi static pressure applied to both halves of the coupling. Inadvertent uncoupling shall
not occur under normal vibration environment of powered flight, dynamic loading of aircraft
within flight and maneuvering envelopes, and during shocks associated catapult launch/arrested
landing. It shall be possible to determine by visual inspection that the coupling is completely
coupled and locked. In addition, couplings shall provide a touch indication for determining
whether the coupling is locked or unlocked. Couplings shall not have any partially coupled
unlocked positions in which the couplings can remain stable and permit fluid flow. Couplings
shall be coupled with a single simple motion.
TABLE II. Coupling assembly rated flow, surge flow, and pressure drop
for all pressure classes.
Dash
Tube
Rated flow
Surge flow
Pressure drop
No.
OD
Gal/min
Gal/min
psi (max)
-04
0.250
1.2
6
8
-06
0.375
3.5
17.5
8
-08
0.500
6.0
30
8
-10
0.625
10.5
52.5
8
-12
0.750
16
80
8
-16
1.000
29
87
8
-20
1.250
45
90
4
-24
1.500
60
120
4
6
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business