MIL-PRF-62625 Valve, Fuel-DrainThis specification covers a check valve used for draining fuel.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7

MIL-PRF-62625B(AT)

3. REQUIREMENTS

3.1 First article. When specified (see 6.2), a first article sample shall be subjected to first

article inspection in accordance with 4.2.

3.2 Materials. Materials used shall be in accordance with the manufacturer's materials

specifications for valves. The materials shall be capable of meeting all of the operational and

environmental requirements specified herein (see 4.4.1).

3.2.1 Metallic materials. Metallic materials shall be either corrosion resistant or

protected to prevent corrosion (see 4.4.1).

3.2.2 Compatibility. The valve shall be capable of functioning with, and shall not

deteriorate from contact with, the following fluids (see 4.4.1).

a. Turbine fuel per MIL-DTL-5624

b. Calibration fluid per MIL-PRF-7024

c. Diesel fuel oil per A-A-52557

3.2.3 Recycled, recovered, or environmentally preferable materials. Recycled,

recovered, or environmentally preferable materials should be used to the maximum extent

possible, provided that the material meets or exceeds the operational and maintenance

requirements, and promotes economically advantageous life cycle costs (see 4.4.1).

3.3 Design and construction.

3.3.1 Envelope. The envelope of the valve shall be as specified on drawing 12302407.

3.4 Performance.

3.4.1 Open-close pressure. When pressure is applied in the closed flow path, the valve

shall close between 55 kiloPascal (kPa) and 75 kPa (between 8 and 11 pounds per square inch

gage (psig)). When the air pressure is decreased, the valve shall open between 75 and 55 kPa

(between 11 and 8 psig) (see 4.4.4).

3.4.2 Proof pressure. The valve shall be capable of operating at 2068 kPa (300 psig) and

shall be capable of withstanding a proof pressure of 3103 kPa (450 psig) with no signs of

damage or external leakage (see 4.4.5).

3.4.3 Burst pressure. The valve shall be capable of withstanding a burst pressure of

5171 kPa (750 psig) without rupturing. The valve is not required to be operational after meeting

this requirement (see 4.4.6).