MIL-DTL-25427B
TABLE IV. Coupling pressure, torque, and force requirements for manual operation.
Dash No.
Static Pressure
Push-pull
Torque rotation
psi
Axial force lb
lb-in
-04
60
30
15
-06
60
35
20
-08
60
40
25
-10
60
45
30
-12
50
50
40
-16
30
60
50
-20
20
60
60
-24
15
60
70
3.7.5 Leakage. Coupling halves shall meet the leakage requirements when tested as
specified in 4.8.5 at 30 inches of static head of hydraulic fluid and operating pressure.
3.7.6 Pressure drop. Each coupling shall indicate a pressure drop within the limits
specified in table II. The fluid temperature shall be 100 °F ± 10 °F and test set-up shall be as
shown on figure 2.
3.7.7 Vacuum. Each coupling half shall meet leakage requirements with no evidence of
malfunction or degradation when hydraulic pressure equivalent to 10 inches of Hg (5 psi) is
applied and lines are closed for five minutes.
3.7.8 Extreme temperature functioning. Each coupling half shall not malfunction during
or after it is subjected to extreme temperature functioning tests low at -65 °F and high at +275 °F
(see 4.8.8).
3.7.9 Rapid warm up. The coupling shall be assembled and disassembled five times
smoothly without malfunction and shall pass the rapid warm up test specified in 4.8.9.
3.7.10 Proof pressure. Each coupling half shall meet operational and leakage
requirements after being subjected to proof pressure of 150 percent of operating pressure for a
period of one minute as specified in 4.8.10.
3.7.11 Surge flow. Coupling halves shall meet leakage, operational, and pressure drop
requirements after being subjected to surge flow (five times the rated flow) in each direction as
specified in table II (see 4.8.11).
3.7.12 Impulse and vibration (1000 and 3000 psi only). The coupling and coupling
halves shall be designed to meet the impulse and vibration test requirements specified in 4.8.12.
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