MIL-DTL-27166F
3.4.2 Castings.
When used, castings shall be of high quality, clean, sound, and free of blow-holes, porosity,
cracks, and other defects which may adversely affect the valve performance.
3.4.3 Valve body.
Unless specifically approved by the procuring agency, non-metallic materials shall not be used
in the construction of the valve body.
3.4.4 Mounting devices.
Unless otherwise specified, each valve shall be provided with a nut, washer, and gasket or other
suitable device for installation purposes.
3.5
Design.
3.5.1 Maintenance.
The design of the valve shall be such that installation and removal from containers may be
accomplished with common hand tools.
3.5.2 Special features.
Special features, such as manual relief devices to permit equalization of pressure prior to
opening the container or filters to limit the entrance of sand or dust, may be used provided they
do not interfere with the other requirements of this specification.
3.5.3 Lubrication.
The design of the valve shall be such that lubrication shall not be required for operation during
the service life.
3.5.4 Screw threads.
All screw threads shall be in accordance with FED-STD-H28, class 2.
3.5.5 Locking of parts.
All internal and external threaded parts shall be locked.
3.5.6 Pipe threads.
Pipe threads shall be in accordance with FED-STD-H28.
3.5.7 Dimensions.
Dimensions and tolerances shall be in accordance with ASME Y14.5. Where dimensions and
tolerances may affect interchangeability, consistent operation, or performance of the valve, they
shall be limited accordingly.
3.5.8 Weight and size.
Weight and size of the valve shall be as small as possible consistent with the requirements
specified herein and with sound engineering practices.
3.6
Performance.
3.6.1 Reseal.
The valve reseal pressure shall be specified by the using activity (see 6.2). The specified reseal
pressure establishes a lower limit by which the valve must be closed. The valve shall not leak
at a rate of 0.061 cubic inch (1 cubic centimeter) of standard air per minute or more in the flow
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