MIL-PRF-62382C
3.3 Design and construction. The valve shall conform to the manufacturer's design and
construction for hydraulic pressure relief valves except for outline dimensions, and porting hole
dimensions and locations which shall conform to Drawing 12265558 (see 4.5.2).
3.3.1 End cap. The threaded end cap (outlet port) of the valve shall be safety-lockwired
with 0.51 millimeter (mm) (0.020 inch) diameter corrosion resistant steel wire in accordance
with Drawing 12265558.
3.4 Performance.
3.4.1 Proof pressure. The valve shall withstand an internal pressure of
31 000 kilopascals (kPa) (4500 pounds per square inch gage [psig]) without leaking externally.
The valve shall not be damaged and shall subsequently meet the requirements of 3.4.3 and 3.4.4
(see 4.5.4.1).
3.4.2 Burst pressure. The valve shall withstand an internal pressure of 52 000 kPa
(7500 psig) without rupture of internal or external parts. The valves need not be operable after
this exposure (see 4.5.4.2).
3.4.3 Function. Unless otherwise specified herein, the valve shall function as specified
below with hydraulic pressure applied to the inlet port.
3.4.3.1 Cracking pressure. The valve poppet shall crack open when the differential
pressure across the valve is not more than 140 kPa (20 psi). The flow after cracking shall be not
less than 1.9 liters per minute (L/min) (0.5 gallons per minute [gal/min]) at 140±7 kPa
(20±1 pounds per square inch differential [psid]) (see 4.5.4.3).
3.4.3.2 Rated flow and pressure drop. With fluid flow through the valve of 20 L/min
(5 gal/min), the pressure drop through the valve shall not be greater than 100 kPa (15 psid)
(see 4.5.4.4).
3.4.3.3 Reseat pressure. After flow is established through the valve, the poppet shall
reseat when the differential pressure is not less than 70 kPa (10 psid). No flow shall be permitted
in the reverse direction (see 4.5.4.5).
3.4.4 Low pressure leakage. There shall be no evidence of leakage through the valve
when a pressure of 35 kPa (5 psig) is applied at the inlet port; there shall be no evidence of
leakage when 200 kPa (30 psig) is applied at the outlet port (see 4.5.4.6).
3.4.5 Environmental. The valve shall meet the requirements of 3.4.1 and shall operate as
specified in 3.4.3 and 3.4.4 under the following environmental conditions.
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