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Medium Pressure Duplex Filter  Pi 370
Nominal pressure 200/250 bar (2850/3560 psi), nominal size up to 450
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 connections
  • Change over valve on upstream side
  • Ergonomic switch-over handle with safety lock and pressure compensation
  • User-optimized one-hand-operation
  • 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
    Operating pressure: Pi 3715 - Pi 3745 200 bar
    Pi 3705 - Pi 3711 250 bar
    Test pressure: Pi 3715 - Pi 3745 260 bar
    Pi 3705 - Pi 3711 325 bar
    Temperature range: -10 C to +120 C
    (other temperature ranges on request)
    Bypass opening pressure: Δp 7 bar 10 %
    Filter head material: GGG
    Filter bowl material: St
    Sealing material: NBR/PTFE
    Activating pressure of optical/ Δp 5 bar 10 %
    electrical differential
    pressure indicator:
    Electrical data of contamination indicator:
    Maximum voltage: 250 V AC/200 V DC
    Maximum current on contact: 1 A
    Inrush current: 70 W
    Type of protection: IP 65 in inserted and
    secured status
    Contact: bistable
    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. The use of quenching circuits must be checked in the case of inductivity in the DC current circuit. The contamination indicator data sheet contains further information and additional contamination indicator versions.

    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 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.

    * 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 EN 175301-803 with poles marked 1 and 2. The electrical section can be inverted to change from normally open 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. Please always ensure that you have original MAHLE spare elements in stock: Disposable elements (PS) cannot be cleaned.
    10.4. Element replacement
    Note: The maintenance indicator monitors the filter side in operation, which is identified by the position of the switching lever catch. The change-over transfer valve must be switched prior filter servicing. Now the signal of the maintenance indicator is cancelled and the red button can be repressed again:
    1. Operate and hold pressure equalizing lever located behind switching lever. Pull catch knob and swivel switching lever. Engage the catch on the clear filter side. Place through or drip pan underneath to collect leaving oil.
    2.Loosen vent screw of the filter side not in use by 2-3 turns; max. until contact is made with the safety stop.
    3. Unscrew filter housing by rotating same counter-clockwise and clean with a suitable medium.
    4. Remove filter element with a side-to-side motion.
    5. Check O-ring on the filter house 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. Remove the plastic bag and push element over the spigot in the filter head.
    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. To refill the filter chamber, operate only the pressure equalizing lever (leave the switching lever arrested in its catch) long enough for the medium to emerge bubble- free from the vent bore.
    9. Tighten vent screw. Check filter for leaks by operating the pressure equalizing lever once again.
    11. Spare parts list