Low Pressure Filter Pi 150

Filtration Group


Related Documents:
Spec/Diagram PDF

Item Information:

High performance filters for modern hydraulic system.  Nominal pressure 10/25 bar (140/360 psi), nominal size up to 630.


  • Provided for pipe installation
  • Modular system
  • Compact design
  • Minimal pressure drop through optimal flow design
  • Visual/electrical/electronic maintenance indicator
  • Threaded 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



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

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 max.Δ p 10 bar
Sm-N 2 Elements with max.Δ p 5 bar

Sm-N   2     ß4(c)  ≥200

Sm-x    3     ß5(c)  ≥200
Sm-x   6     ß7(c)  ≥200
Sm-x   10   ß10(c)  ≥200
Sm-x   25   ß20(c)  ≥200

values guaranteed up to 10 bar differential pressure, Sm-N 2 elements up to 5 bar differential pressure

The filter element Sm-N 2 is an element with a very large dirt holding capacity, especially for bypass filtration.

5. Quality assurance
Filtration Group filters and filter elements are produced according to the following international standards:
6. Symbols
7. Order Numbers
8. Technical specifications
Nominal pressure: 10/25 bar (140/360 psi)
Temperature range: -10 °C to +120 °C
  (other temperature ranges on request)
Bypass setting: Δ p 3.5 bar 10 %
Material filter head/cover: GAL
Material filter housing: St
Sealing material: NBR
Maintenance indicator setting: Δ p 2.2 bar 10 %
Electrical data of maintenance indicator:  
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.

Housings with nominal pressure 10 bar (140 psi) are fitted standard with air bleeder valve, housings with nominal pressure 25 bar (360 psi) with a venting screw.

Subject to technical alteration without prior notice.

9. Dimensions
All dimensions except "C" in mm.

NPT- and SAE connections on request.
* Standard pressure series hole pattern 3000 PSI
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.
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 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. 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 Filtration Group spare elements in stock: Disposable elements (Sm-x, Sm-N, Mic) cannot be cleaned.
10.4 Element replacement
1 . Stop system and relieve filter from pressure.
2 . Loosen quick-action clamp (10 bar version) or screws of flanged cover, remove cover, and open drain valve. Housing completely vented.
3 . Remove filter element from the filter housing.
4 . Check seal for damages, replace if necessary.
5 . 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.
6 . 10 bar version: Close drain valve, relocate cover, and close the quick-action clamp. Filters are automatically vented via the airbleeder valve, the protection cap S has to be turned 2 times for being open.
7 . 25 bar version: Close drain valve, and put the cover plate on so that the stud bolts go into the holes of the cover plate. Make sure not to squeeze the O-ring on the bottom side of the cover plate. Hand-tighten the 8 mounting nuts with spring rings. Then draw up the nuts tight crosswise with a turn-screw SW 19 without canting the cover plate. Tightening torque for mountings nuts is 50 Nm. After bringing the hydraulic unit to service deaerate the filter via vent-screw.
11. Spare parts list