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Low Pressure Filter Pi 2000/Pi 2200
Nominal pressure 25 bar (360 psi), nominal size 630 up to 2000 according DIN 24550
1. Features
High performance filters for modern hydraulic system
  • Provided for pipe installation
  • Modular system
  • Compact design
  • Minimal pressure drop through optimal flow design
  • Visual/electrical/electronic maintenance indicator
  • Flanged connections
  • Quality filters, easy to service
  • Equipped with highly efficient glass fibre Sm-x filter elements
  • Beta rated elements according to ISO 16889 multipass test
  • Elements with high differential pressure stability and dirt holding capacity
  • Worldwide distribution
  • 2. Flow rate/pressure drop curve complete filter

    y=differential pressure Δp [bar]
    x = flow rate V [l/min]

    3. Separation grade characteristics 4. Filter performance data

    y=beta-value
    x=particle size [µm]

    determined by multipass tests (ISO 16889)
    calibration according to ISO 11171 (NIST)

    tested according to ISO 16889 (multipass test)

    Sm-x elements with

    Sm-x vst elements with

    max. Δp 20 bar

    max. Δp 210 bar

    Sm-x    3     5(c)    ≥200 Sm-x vst    3       5(c)   ≥200
    Sm-x    6     7(c)    ≥200 Sm-x vst    6       7(c)   ≥200
    Sm-x    10   10(c)   ≥200 Sm-x vst    10     10(c)  ≥200
    Sm-x    16   15(c)   ≥200 Sm-x vst    16     15(c)  ≥200
    Sm-x    25   20(c)   ≥200 Sm-x vst    25     20(c)  ≥200
    Values guaranteed up to
    10 bar differential pressure
    Values guaranteed up to
    20 bar differential pressure
    5. Quality assurance
    6. Symbols
    7. Order numbers

    8. Technical specifications
    Design: Flange filter
    Nominal pressure: 25 bar (360 psi)
    Test pressure: 32 bar (460 psi)
    Temperature range: -10 C to +120 C
    (other temperature ranges on request)
    Bypass setting: Δp 3.5 bar 10 %
    Filter head material: GDAL
    Filter housing material: AL
    Sealing material: NBR/AL
    Maintenance indicator setting Δp 2.2 bar 0.3 bar
    Electrical data of maintenance indicator PiS 3097:
    Max. voltage: 250 V AC/200 V DC
    Max. current: 1 A
    Contact load: 70 W
    Type of protection: IP 65 in inserted and
    secured status
    Contact: normally open/closed
    Cable sleave: M20x1.5

    The switching function can be changed by turning the electric upper part by 180 (normally closed contact or normally open contact). The state on delivery is a normally closed contact. By inductivity in the direct current circuit the use of suitable protection circuit should be considered. Further maintenance indicator details and designs are available in the maintenance indicator data sheet.

    We draw attention to the fact that all values indicated are average values and do not always occur in specific cases of application. Our products are continually being further developed. Values, dimensions and weights can change as a result of this. Our specialized department will be pleased to offer you advice.

    We recommend you to contact us concerning applications of our filters in areas governed by the EU Directive 94/9 EC (ATEX 95). The standard version can be used for liquids based on mineral oil (corresponding to the fluids in Group 2 of Directive 97/23 EC Article 9). If you consider to use other fluids please contact us for additional support.

    Due to the modular system, filter can be easily converted from single type into parallel or duplex type.

    Subject to technical alteration without prior notice.

    9. Dimensions

    10. Installation, operating and maintenance instructions
    10.1 Filter installation
    When installing the filter make sure that sufficient space is available to remove filter element and filter housing. Preferably the filter should be installed with the filter housing pointing downwards.
    The maintenance indicator must be visible.
    10.2 Connecting the electrical maintenance indicator
    The electrical indicator is connected via a 2-pole appliance plug according to DlN 43650 with poles marked 1 and 2. The electrical section can be inverted to change from normally open position to normally closed position or vice versa.
    10.3 When should the filter element be replaced?
    1. Filters equipped with visual and electrical maintenance indicator:
    During cold starts, the indicator may give a warning signal. Press the red button of the visual indicator once again only after operating temperature has been reached. If the red button immediately pops up again and/or the electrical signal has not switched off after reaching operating temperature, the filter element must be replaced after the end of the shift.
    2. Filters without maintenance indicator: The filter element should be replaced after trial run or flushing of the system. Afterwards follow instructions of the manufacturer.
    3. Please always ensure that you have original MAHLE spare elements in stock: Disposable elements (Sm-x) cannot be cleaned.
    10.4 Element replacement
    1 . Stop system and relieve filter from pressure.
    2 . Open venting screw in filter cover (ascertain switching lever position with duplex filter and carefully check which filter housing is under pressure).
    3 . Remove drain plug in housing bottom and drain oil.
    4 . Unscrew filter cover (CCW).
    5 . Lift out filter element.
    6 . Check seal on filter cover. We recommend replacment in any case.
    7 . Make sure that the order number on the spare element corresponds to the order number of the filter name-plate. Remove packaging and place element closed end downward into filter housing.
    8 . Carefully insert element holding fixture of the filter cover into the open end of the element and tighten cover against stop.
    9 . Close drain plug on housing bottom.
    10 . Carefully vent filter prior operation. Then thighten venting screw.
    Additional remark:For cleaning purposes the filter housing can be removed by unscrewing counter-clockwise. Please change both elements at the parallel type.
    11. Spare parts list