Continuous bleed. If the valve Incorporates any
requirement for continuous bleed, the amount of flow from the valve
shall be considered as a part of the total valve leakage as defined in
Electrical requirements. The valve shall meet the
requirements of this specification with electric power from a 28-volt dc
system conforming to MIL-STD-704. Steady-state operating or holding
current of the unit shall not exceed 3 amperes.
Connectors. Electric connectors shall be in accordance
with MIL-C-5015. Provisions for lockwiring the connector plug shall be
incorporated at the electric receptacle.
Internal electric connections. Internal connections
shall be made in accordance with MIL-E-5400 and MIL-STD-454.
Position indicator. The valve shall be equipped
with an external position indicator which shall include suitable markings
to indicate valve "open" and "close" positions. In addition, an electric
switch shall be provided to operate an indicator light when the valve is
more than 3 degrees open.
The valve shall not require lubrication.
Weight. The weight of the valve shall not exceed
the value specified on the specification sheet.
Performance. The valve performance shall meet the
operating requirements specified herein for any valve attitude. All
performance data shall be based upon the use of production hardware.
Valve manufacturers shall furnish performance data on each model valve
they propose to have qualified in accordance with the requirements of
4.2.1 herein. The data shall be in the form shown on Table I, and may
be estimated or calculated until the valve has been tested. After that
time, performance data shall be based on test results.
Valve operation. The valve shall be normally closed,
electrically and pneumatically operated open and pressure regulating.
The valve shall remain open as long as pneumatic pressure is maintained
and the electric circuit is energized. The valve shall close automatically
in the event of loss of electric power or pneumatic energy.