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High Pressure Filter Pi 420
Nominal pressure 400 bar (5690 psi), nominal size up to 450

optional with reverse flow valve
1. Features
High performance filters for modern hydraulic systems
  • Modular system
  • Compact design
  • Minimal pressure drop through optimal flow design
  • Visual/electrical/electronic maintenance indicator
  • Threaded or flanged connections
  • Equipped with highly efficient glass fibre PS filter elements
  • Beta rated elements according to ISO 16889 multipass test
  • Elements with high differential pressure stability and dirt holding capacity
  • NPT- and SAE-connections on request
  • 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)

    PS elements with PS vst elements with
    max. Δp 20 bar

    max. Δp 210 bar

    PS    3     5(c)    ≥200 PS vst    3       5(c)   ≥200
    PS    6     7(c)    ≥200 PS vst    6       7(c)   ≥200
    PS    10   10(c)   ≥200 PS vst    10     10(c)  ≥200
    PS    25   20(c)   ≥200 PS vst    25     20(c)  ≥200
    Values guaranteed up to
    10 bar differential pressure
    Values guaranteed up to
    20 bar differential pressure
    5. Quality assurance
    MAHLE filters and filter elements are produced according to the following international standards:
    6. Symbols
    7. Order numbers

    8. Technical specifications
    Design: line mounting filter
    Nominal pressure: 400 bar (5690 psi)
    Test pressure: 520 bar (7400 psi)
    Temperature range: -10 C to +120 C
    (other temperature ranges on request)
    Bypass setting: Δp 7 bar 10 %
    Filter head material: GGG
    Filter housing material: St
    Sealing material: NBR/PTFE
    Maintenance indicator setting: Δp 5 bar 10 %
    Electrical data of maintenance indicator:
    Maximum voltage: 250 V AC/200 V DC
    Maximum 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 which 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 to contact us concerning applications of our filters in areas governed by the EU Directive 94/9 EG (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 EG Article 9). If you consider to use other fluids please contact us for additional support.

    * Subject to technical alteration without prior notice.

    In = Inlet
    Out = Outlet
    *1= Visual maintenance indicator
    *2= Electrical upper section connector according DIN EN 175301-803, version: PiS 3092, 3105, 3115
    *3= Electrical upper section connector according DIN EN 175301-804, version: PiS3102, 3122, 3110
    *4= NG 300, 450 with drain screw G DIN 910
    DN25 according to SAE1" 6000 psi
    DN38 according to SAE1" 6000 psi
    Flange, screw, o-ring not included in delivery.
    9. Dimensions
    10. Execution with reverse flow valve
    Filters are normally designed for single- direction flow only. Reverse flows result in destruction of the cartridge. Some applications can require the medium to flow through the filter in both directions, however. The Pi 420 with a reverse flow valve can be used here. It allows medium flows in both directions, although it only filters in one. The liquid is not filtered in reverse mode. The reverse flow valve can be supplied with or without a bypass function.
    11. Installation, operating and maintenance instructions
    11.1 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.
    11.2 Connecting the electrical maintenance indicator
    The electrical indicator is connected via a 2-pole appliance plug according to DlN EN 175301-803 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.
    11.3 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. lf 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 the 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 (PS) cannot be cleaned.
    11.4. Element replacement
    1. Stop system and relieve filter from pressure.
    2. Filter sizes 300 and 450: empty the filter housing by removing the drain plug.
    3. Unscrew the filter housing by turning counter-clockwise. Clean the housing using a suitable cleaning solvent.
    4. Remove element by pulling down carefully.
    5. Check o-ring, spigot and o-ring in the element locator for damage. Replace, if necessary.
    6. Make sure that the order number on the spare element corresponds to the order number of the filter name-plate. To ensure no contamination occurs during the exchange of the element first open the plastic bag and push the element over the spigot in the filter head. Now remove plastic bag.
    7. Lightly lubricate the thread of the filter housing and screw onto the filter head completely. After that unscrew the filter housing 1/8 to 1/2 return.
    8. Check seals of vent drain plug - if necessary, please replace.
    Torque drain plug 30 Nm.
    11. Spare parts list