Admiral Filter contact info
High Performance

Product Overview

Admiral's duplex lube oil filters provide uninterrupted flow during fluid transfer and cartridge changeout. Filtration of lube oil at flows up to 1500 GPM are standard. Higher flows are available, with system pressures up to 500 p.s. i.

Admiral's duplex lube oil filters are installed on hundreds of naval and merchant marine vessels worldwide, including frigates, destroyers and submarines, e.g. AD, AOE, LSD, AO, FF, AS, DDG, SSN, LHA, MCM,FFG, and DD class, US Navy ships, plus those of foreign navies.

Product Description

Two cylindrical housings are connected via inlet and outlet valves. The valves are linked by a common gear box with a hand wheel that allows selection of a clean housing without interruption of the oil flow. Oil enters the top of the housing, and particulates are trapped within the elements as the oil passes through. When a predetermined differential pressure is reached, changeover to a clean housing is accomplished, automatically or manually. The cover hold-down bolts and vent valve associated with the out of service housing become exposed and this allows the dirty filter elements to be cleaned or replaced without interruption of flow.



  • Fabricated construction gives flexibility
  • Indicator shows housing in use
  • Pivoting safety cover encloses closure bolts and vent valve of housing in operation
  • Equalizing valve closes automatically when unattended
  • Fail safe interlock prevents accidental changeover during element maintenance
  • Spray deflector welded to head/housing


  • Provides uninterrupted flow during fluid transfer
  • Accepts disposable or cleanable elements, or baskets without hardware modification
  • Minimum space for mounting and easy maintenance



Filtration Efficiency:


Flow Rate:

Liquid Filtered:

Operating Pressure:

Hydrostatic Test Pressure:

Clean Pressure Drop:

Unit Height:

Unit Width:

Dim. Across Inlet & Outlet:

Unit Weight, Dry:

Unit Weight, Wet:

Temperature Range:

Material, Housing:

Test Qualifications



Duplex Filter, 6" NPS

25 Microns Absolute

MIL-S-17849D, Type I, Class 8 except for C.S. welded construction & HH-P-96 gasket material

850 GPM @ 80 psig

Lubricating Oil per MIL-L 17331

90 psig

143 psig

10 psig maximum with 600SSU oil at 90°F

57 inches maximum

59 inches maximum

30 inches reference

1500 pounds estimated

1850 pounds estimated

40° to 180°

Carbon Steel


MIL-S-901 Grade A Class I

MIL-STD-167 Type I

Typical Aplications

  • Engines
  • Turbines
  • Compressors
  • Generators and other rotating and reciprocating machinery
  • Lube or Fuel Oil (Diesel or Turbine)
  • Sea or Fresh Water


  • Alarm Switches
  • Totally Automatic Changeover
  • Backflush or Self-cleaning
  • Differential Pressure Gauge
  • Differential Pressure Indicator
  • Inlet and Outlet Pressure Gauges
  • Various construction materials, Cupro Nickel, Monel, Stainless Steel & Aluminum