MIL-DTL-9370E
TABLE II. Conformance inspections, sample size, and acceptance criteria.
Classification of
Sample Size 1/
Acceptance Criteria
Inspection
Characteristics
Method
Visual
Critical
Every valve for
Reject all valves with
4.6.1.1
examination (see
critical defects.
any critical defects.
classification of
Minor
Inspection level
defects, table III)
II for minor
defects.
Dimensions and
Major
4.6.1.2
Inspection level
Acceptance number zero
configuration
S-2
Rejection number one
Minimum
Major
4.6.2
Inspection level I Acceptance number zero
operating
Rejection number one
acceleration
force
Outlet pressure
Major
4.6.3
Inspection level
Acceptance number zero
regulation
S-2
Rejection number one
Leakage
Critical
4.6.4
Every valve
Reject all defective
units.
Anti-chattering
Major
4.6.5
Inspection level I Acceptance number zero
Rejection number one
Response time
Major
4.6.6
Inspection level
Acceptance number zero
S-2
Rejection number one
1/ The sample size shall be based only on the applicable sample size code letter corresponding
to the specified inspection level of ASQ-Z1.4.
4.4.1.1.1 Valve. An inspection lot size shall be expressed in units of valves. A lot shall
consist of valves manufactured essentially under the same conditions and from the same
materials and components. The sample unit shall be one valve.
4.4.1.2 Sample size. The sample size and acceptance criteria shall be as specified in table
II.
4.5 Test conditions.
4.5.1 Temperature and pressure. Unless otherwise specified, tests shall be conducted at
local ambient temperature and barometric pressure. Test instruments shall be calibrated or
adjusted according to their required usage in conducting individual tests. The temperature and
barometric pressure shall be recorded at the time of inspection. This information shall be
available for comparison of test data, where required, to normal temperature and pressure (NTP)
conditions. NTP conditions are 29.92 inches of mercury and 70 °F.
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