MIL-PRF-62382C
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4.5.2 Defects. Conformance to 3.3, 3.3.1, 3.6, 3.7 and 3.8 shall be determined by
examination for the defects listed in table II. Examination shall be visual, tactile, or by
measurement with SIE.
4.5.3 Test conditions. Unless otherwise specified (see 6.2), ambient air temperature shall
be 23±10 °C (73±18 °F), barometric pressure shall be 725 +50/-75 mm mercury (Hg)
(28.5 +2/-3 inches Hg), and relative humidity shall be 50±30 percent. Unless otherwise specified
herein, the valve shall meet all specified performance requirements in a hydraulic system,
utilizing hydraulic fluid conforming to MIL-PRF-5606 or MIL-PRF-6083 or the commercial
equivalents under the following conditions:
a. Hydraulic fluid temperature of 38±5 °C (100±10 °F).
b. Hydraulic fluid operating pressure of 20 700±700 kPa (3000±100 psi).
4.5.4 Performance.
4.5.4.1 Proof pressure. To determine conformance to 3.4.1, the valve shall be subjected
to a static pressure test of 31 000 kPa (4500 psi) for a duration of 2 minutes. There shall be no
external leakage. The test shall be performed with pressure applied to the inlet port with the
outlet port plugged.
4.5.4.2 Burst pressure. To determine conformance to 3.4.2, the valve shall be subjected
to a static pressure test of 52 000 kPa (7500 psig) for a duration of 2 minutes. Pressure shall be
applied to the inlet port, with the outlet port plugged. External or internal parts of the valve shall
not rupture. This is a destructive test, so test valves shall be indelibly marked "DO NOT USE"
and discarded.
4.5.4.3 Cracking pressure. To determine conformance to 3.4.3.1, pressure shall be
applied slowly to the valve inlet until the valve poppet cracks open. The pressure differential at
the instant of valve opening shall not be more than 140 kPa (20 psid). After opening, the flow
shall be not less than 1.9 L/min (0.5 gal/min) at 140±7 kPa (20±1 psid).
4.5.4.4 Rated flow and pressure drop. To determine conformance to 3.4.3.2, pressure
shall be applied to the valve inlet and the flow shall be adjusted to 20 L/min (5 gal/min). The
pressure drop through the valve shall not be more than 100 kPa (15 psi).
4.5.4.5 Reseat pressure. To determine conformance to 3.4.3.3, a pressure of 172 kPa
(25 psi) shall be applied to the valve inlet and flow through the valve verified. Then the pressure
shall be gradually decreased until the valve closes. The differential pressure at the instant of
valve closing shall be not less than 70 kPa (10 psi).
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