MIL-DTL-24402F(SH)
3.5.2.1 Filter housing bowls. Filter housing bowls shall utilize threaded connections between the filter bowl
and housing. The entering ends of the bowl and housing threads shall incorporate a blunt start in which the partial
thread at the entering end is removed to prevent crossing of threads during assembly. Filter housing bowls shall be
provided with square wrench flats to facilitate bowl removal during filter element replacement. The threaded filter
bowls shall be provided with not less than 2-inch wide knurling completely around the bowl circumference.
3.5.2.2 Drain plug. Filter housings shall be equipped with a drain plug. The positioning of the drain plug shall
permit maximum drainage of oil from the assembly during filter element replacement.
3.5.2.3 Loads. Filter housings shall withstand the structural loads imposed by the tests (see 4.3). In addition,
the filter housing shall be of such strength and rigidity as to withstand the wrench loads required for making tube
connections and replacing filter elements.
3.5.3 Protective and control devices.
3.5.3.1 Differential pressure indicators. Filter assemblies shall be equipped with differential pressure
indicators. The indicators shall conform to the envelope and male gland dimensions shown on the specification
sheet for differential pressure indicators and shall be mounted to the filter assembly using the porting detail shown
on figure 1. The filter housing shall permit the mounting of any indicator in not less than two of four 90-degree
orientations. Three-element filter assemblies (see the applicable specification sheet) shall have an indicator installed
which can be rotated 180 degrees to permit viewing from either side of the assembly.
3.5.3.1.1 Mechanical differential pressure indicators. Mechanical differential pressure indicators shall actuate,
by raising a red indicator, at a filter element differential pressure value specified in the applicable specification
sheet. The indicator shall have a surge lockout to prevent actuation for not less than 5 seconds for differential
pressures equal to or less than a value specified in the applicable specification sheet. The indicator shall not
inadvertently actuate under the vibration of a 20 gravity shock load. Once actuated, the red indicator shall be
constructed so that it can be manually reset at 3,000 lb/inČ operating pressure without the assistance of any tool.
3.5.3.1.2 Electrical differential pressure indicators. Electrical differential pressure indicators shall actuate by
raising a red indicator and making electrical contacts simultaneously at a filter element differential pressure value
specified in the applicable specification sheet. The electrical connector shall conform to class, size, insert
arrangement, and style requirements of SAE-AS34521 as identified by part or identifying number (PIN)
MS3452W-10SL-3P. The electrical rating on the single-pole, double-throw switch shall be 5 amperes at 110 volts
alternating current (VAC), 28 volts direct current (VDC) (resistive), and 3 amperes at 100 VAC, 28 VDC
(inductive). The switch shall be constructed with a removable 2-watt, 6,800-ohm resistor installed internally across
the normally open contacts, for possible use in a supervised monitoring system. Electrical connector Pins A and B,
in accordance with MIL-STD-1651, Arrangement 3, shall be connected to the normally open contacts. The indicator
shall have a surge lockout to prevent actuation for not less than 5 seconds for differential pressure equal to or less
than a value specified in the applicable specification sheet. The indicator shall not inadvertently actuate under the
vibration of a 20 gravity shock load. Once actuated, the red indicator shall be constructed so that it can be manually
reset at 3,000 lb/inČ operating pressure without assistance of any tool.
3.5.3.1.3 Gauge-type differential pressure indicators. Gauge-type differential pressure indicators shall have a
differential pressure range as specified in the applicable specification sheet. The indicators shall be marked in
10-lb/inČ graduations with identifying numbers every 20 lb/inČ. Gauges shall not be redlined. Gauges shall
withstand forward and reverse differential pressures of up to 3,000 lb/inČ without any zero shift or loss of accuracy.
Accuracy shall be within ±11 lb/inČ. When specified (see 6.2), a calibration procedure shall be provided. Gauges
shall have a protective shield to safeguard gauge from impact damage.
3.5.3.2 Bleed valve. Each filtration circuit of each filter assembly shall include a safety bleed valve to vent
system pressure from the filter bowls, thus allowing safe disassembly.
3.5.3.3 Bypass-relief valve. Filter assemblies designated Type R (see the applicable specification sheet) shall
have a relief valve to automatically bypass hydraulic fluid, in the event of excessive flow restriction through the
filter elements. The relief valve shall be set in accordance with the setting specified in the applicable specification
sheet. The relief valve shall be integral to the filter housing.
4
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business