MIL-DTL-45300C
3.4.1.2 Fording valve (type II only). The torque required to move the fording valve out of closed or open position
shall be not less than 10 inch-ounces (see 4.6.3.2).
3.4.2 Leakage (all types). When tested as specified in 4.6.4, with a pressure of 2 pounds per square inch (psi) for
type I and 1 psi for type II (with fording value closed) and type III caps, the leakage shall not exceed 0.5 ounce per
minute.
3.4.3 Pressure relief valve opening.
3.4.3.1 Type I. When tested as specified in 4.6.5.1, the pressure relief valve for type I caps shall open at between
4 to 5 psi, when the float is in the actuated condition.
3.4.3.2 Type II. When tested as specified in 4.6.5.2, the pressure relief valve for type II caps shall open at
between 2 to 3 psi, when the fording valve is in the closed position.
3.4.4 Free breathing (types I and II). When tested as specified in 4.6.6, type I and type II caps (type II cap with
fording valve open) shall have an air flow through them of not less than 0.010 cubic foot per minute (cfm), at room
temperature with 1 psi vacuum.
3.4.5 Shear strength (all types). When tested as specified in 4.6.7, type I and type II caps shall withstand not less
than 25 foot-pounds of applied torque before showing any rotation of the inner member with respect to the outer shell.
Type II and type III caps shall withstand not less than 25 foot-pounds of applied torque before showing any rotation of
cup on inner plate or inner plate on shell.
3.4.6 External pressure (types II and III). When tested as specified in 4.6.8, type II (with fording valves closed) and
type III caps shall not leak.
3.5 Finish (all types). Unless otherwise specified (see 6.2), caps shall be finished on the interior or exterior as
specified in the applicable MS standard (see 3.3 and 4.6.2).
3.6 Identification marking (all types). Caps shall be marked in accordance with the applicable MS standard and
the requirements of MIL-STD-130 (see 3.3 and 4.6.2).
3.7 Cleaning. The caps and all cap parts in contact with fuel shall be cleaned.
3.8 Workmanship (all types). The workmanship of the cap shall be of such quality as to assure a product free of
defects affecting its serviceability and appearance (see 4.6.2).
4. VERFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.5).
4.1.1 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient
accuracy, quality and quantity to permit performance of the required inspection shall be used. The establishment and
maintenance of a calibration system to control the accuracy of the measuring and test equipment shall be in
accordance with ISO 17025 and NCSL Z540.3 as applicable.
4.1.1.1 Component and material inspection. Components and materials shall be inspected in accordance with all
the requirements specified herein and in applicable documents.
4.2 First article inspection. First article inspection shall be performed on one complete cap assembly when a first
article sample is required (see 3.1). This inspection shall include the examination of 4.4 and the tests of 4.5.1
through 4.5.3.
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