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Page Title:
Directional control valve handle installation |
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|  MIL-H-8891A
Directional control valve handle installation - All
3,10.7.1
installations of directional control valve handles shall conform to AFSC
DH 2-2 for the Air Force and the Army, and for the Navy as approved by the
Cockpit Board of the Naval Air Systems Command. When the effective handle
length exceeds 0.8 inch, limiting stops, external to the valve, shall be
provided. These stops shall be capable of withstanding 75 pound-inches
limit load and shall be so positioned that no load will be applied to the
internal valve stops, unless the valve has been specifically designed to
handle subject loads.
Multiple control valve systems - In systems which in-
3.10.7.2
corporate two or more directional control valves, provision shall be made
to prevent fluid from being transferred inadvertently, at any possible valve
setting, from the cylinder ports of one valve into the cylinder ports of
another valve.
Control valve actuation - Control valve operation may
*
3.10.7.3
be direct, such as push-pull rods or cable control, or indirect, such as
electrically operated controls. Push-pull rods shall require a-minimum or
no adjustment. Cable control shall be designed to provide minimum adjust-
ment and positive control. All controls shall be designed to prevent over-
travel or undertravel of the valve control handle by use of external or
internal stops. Electrically operated valves shall be provided with mechan-
ical override control mechanisms wherever practicable and at the option of
the procuring activity,
Control valve wiring - Electrically operated control
3.10.7.4
valves shall be wired in accordance with MIL-W-5088.
Filters - Line filters, when installed in the vehicle
*
3.10.8
system in close proximity to an accumulator, shall be installed upstream of
the accumulator. Pressure-drop indicators shall be provided on the filter
assembly; the indicator shall be easily visible to servicing personnel.
When a screen or filter is provided either internally or in close proximity
to a component, suitable provisions shall be made for removal of the screen
or filter for cleaning or replacment. Sintered-type elements shall not be
used. Filters shall not be installed between the system reservoir and the
pump suction port unless specifically authorized by the procuring activity.
Navy vehicle filters - All filters installed in the
3.10.8.1
hydraulic system(s) shall be in general accordance with the requirements
of MIL-F-8815 (5 micron absolute type) except that each filter element
and the filter assembly shall be suitable for the temperature and pressure
specified in the detail specification, Filter elements shall be the dis-
posable (throwaway), depthtype unit. These filters shall be used to filter
all the the circulating fluid in the system. In all aircraft delivered,
the system contamination level shall not exceed the particle size and range
listed as class 8 of Table I of NAS 1638 as determined in accordance with
method 3009 of FED-STD-791.
*
Air Force and Army vehicle filters - All filters in-
3.10,8.2
stalled in the hydraulic system(s) shall be in general accordance with the
requirements of MIL-F-8815 (15 micron absolute type) except that each filter
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