FHF 325 series
Maximum working pressure up to 35 MPa (350 bar) - Flow rate up to 550 l/min
High Pressure  lters
Filter housing according to SAE J2066 for HF4  lter elements
High Pressure  lters
553
Choose  lter type (MPF, MPT, etc.) in function of
the max working pressure and the max  ow rate
Step
3
TYPICAL FILTER SIZING
Select “FILTERS”
Step
1
Choose  lter group (Return Filter, Pressure Filter, etc.)
Step
2
Push “PROCEED”
Step
4
Download PDF
Datasheet “Report.aspx” pushing the button “Drawing”
Step
7
Insert all application data to calculate the  lter size following the sequence:
- working pressure
- working  ow rate
- working pressure drop
- working temperature
-  uid material and  uid type
-  ltration media
- connection type
Step
5
Push “CALCULATE” to have result;
in case of any mistake, the system
will advice which parameter is out
of range to allow to modify/adjust
the selection
Step
6
Selection Software
GENERAL INFORMATIONFHF 325
- Head: Phosphatized cast iron
- Housing: Phosphatized steel
- Cover: Cast iron (chemical heat treatment)
- Bypass valve: Brass - Steel
Filter housing materials
- Working pressure: 35 MPa (350 bar)
- Test pressure: 52.5 MPa (525 bar)
- Burst pressure: 105 MPa (1050 bar)
- Pulse pressure fatigue test: 1 000 000 cycles
with pressure from 0 to 35 MPa (350 bar)
Pressure
From -25 °C to +110 °C
Temperature
- Opening pressure 600 kPa (6 bar) ±10%
- Other opening pressures on request.
Bypass valve
- Micro bre  lter elements - series N: 20 bar
- Wire mesh  lter elements - series N: 20 bar
- Fluid  ow through the  lter element from OUT to IN
∆p element type
- Standard NBR series A
- Optional FPM series V
Seals
FHF  lters are provided
for vertical mounting
Note
FHF 325: In-line threaded connection
FHF 325: In-line  anged connection
FHF 325: Manifold mounting
Connections
Filter housing according to SAE J2066 for HF4  lter elements
Weights [kg] and volumes [dm
3
]
23.90 32.68 41.47
1 2 3Length Length
Weights [kg]
FHF 325 3.50 5.80 8.11
1 2 3
Volumes [dm
3
]
Filter series
High Pressure  lters
Manifold
Maximum working pressure up to 35 MPa (350 bar)
Flow rate up to 550 l/min
FHF is a range of high pressure filter for protection of sensitive
components in high pressure hydraulic systems in the mobile machines.
They are directly connected to the lines of the system through the
hydraulic  ttings or the proper  anged interface.
Available features:
- 1 1/2” female threaded connections, 1 1/2”  anged connections and
manifold connections up to 1 1/2”, for a maximum  ow rate of 500 l/min
- Base-mounting design, for ease of the replacement of the  lter element
- Filter element designed in accordance with SAE J2066 HF4 regulation
- Fine  ltration rating, to get a good cleanliness level into the system
- Bypass valve, to relieve excessive pressure drop across the  lter media
- Low collapse filter element “N”, for use with filters provided with
bypass valve
- Visual, electrical and electronic differential clogging indicators
Common applications:
Delivery lines, in any high pressure industrial equipment
Description Technical data
High Pressure  lters
554
GENERAL INFORMATION FHF 325
Filter housing according to SAE J2066 for HF4 lter elements
Hydraulic symbols
Style S Style B Filter series
FHF 325
OUT
D.I.
IN
OUT
D.I.
IN
• •
Filter housings ∆p pressure drop
Pressure drop
The curves are plotted using mineral oil with density of 0.86 kg/dm
3
in compliance with ISO 3968. ∆p varies proportionally with density.
Valves
Bypass valve pressure drop
1.50
1.00
0.50
0.00
0 120
240
360 480
600
FHF 325
1 1/2”
Flow rate l/min
∆p bar
Manifold
1
2
3
FHF 325
LengthFilter series
Maximum ow rate for a complete pressure lter with a pressure drop ∆p = 1.5 bar.
The reference uid has a kinematic viscosity of 30 mm
2
/s (cSt) and a density of 0.86 kg/dm
3
.
For different pressure drop or uid viscosity we recommend to use our selection software available on www.mpltri.com.
You can also calculate the right size using the formulas present on the FILTER SIZING paragraph at the beginning of the full catalogue or at the beginning of the lter family brochure.
Please, contact our Sales Department for further additional information.
Filter element design - N Series
A03 A06 A10 A16 A25 M25
302 339 348 419 500 556
401 424 434 457 505 557
416 451 460 469 510 559
FILTER ASSEMBLY SIZING
Flow rates [l/min
]
High Pressure lters
555
Designation & Ordering code
COMPLETE FILTER
Element series and size
HF325
Conguration example:
Execution
P01
Pxx
MP Filtri standard
Customized
HF325 A2 NA10 P01
Element ∆p
N 20 bar
Element length
1 2 3
Seals
A
V
NBR
FPM
FILTER ELEMENT
Filtration rating (lter media)
A03
M25A10
A06
A16
A25
Inorganic microber
Wire mesh
3 µm
25 µmInorganic microber 10 µm
Inorganic microber 6 µm
Inorganic microber 16 µm
Inorganic microber 25 µm
M25
A16
A25
Wire mesh 25 µm
Inorganic microber 16 µm
Inorganic microber 25 µm
Series and size
Conguration example:
Execution Element ∆p
P01N
Pxx
MP Filtri standard20 bar
Customized
FHF325 A2 7 NHS A10 P01
FHF325
Filtration rating (lter media)
Connection for differential indicator
A03
7
A10
A06
Inorganic microber
With two connections plugged on both sides
3 µm
Inorganic microber 10 µm
Inorganic microber 6 µm
Seals
A
S
B
V
NBR
Without bypass
With bypass 6 bar
FPM
Length
Valves
1 2 3
Connections
A
G
C
M
N
B
H
G 1 1/2”
1 1/2” SAE 6000 psi/M
SAE 24 - 1 7/8” - 12 UN
Manifold ø1.38”
Manifold ø1.50”
1 1/2” NPT
1 1/2” SAE 6000 psi/UNC
FHF 325
ACCESSORIES
Additional features
page
T2 Plug 582
Differential indicators
page page
DEA
DLE
Electrical differential indicator 577
Electrical / visual differential indicator 580
DLA
DEM
Electrical / visual differential indicator 579-580
Electrical differential indicator 578-579
DVA
DTA
DVM
Visual differential indicator 581
Electronic differential indicator
Visual differential indicator
581
581
DEH Hazardous area electronic differential indicator 577-578
High Pressure lters
556
Ø136
Dimensions
Connection A - B - C
FHF325
Filter
length
1
2
3
H
[mm]
452
690
928
H2
[mm]
250
485
725
OUTIN
Drain plug
on both sides
Vent IN
Vent OUT
Nr. 4 holes
Connection for
differential indicator
T2 plug on both sides
FHF 325
Recommended
clearance space
for maintenance
High Pressure lters
557
Dimensions
Ø136
Connection G - H
FHF325
Filter
length
1
2
3
H
[mm]
463
701
939
H2
[mm]
250
485
725
OUTIN
Drain plug
on both sides
Vent IN
Vent OUT
Nr. 4 holes
Connection for
differential indicator
T2 plug on both sides
Recommended
clearance space
for maintenance
FHF 325
High Pressure lters
558
Connection M - N
Ø136
FHF325
Filter
length
1
2
3
H
[mm]
452
690
928
H2
[mm]
250
485
725
Dimensions
OUTIN
Drain plug
on both sides
Vent IN
Vent OUT
Nr. 4 holes
Connection for
differential indicator
T2 plug on both sides
Recommended
clearance space
for maintenance
FHF 325
High Pressure lters
559
SPARE PARTS
Filter housing according to SAE J2066 for HF4  lter elements
Item: Item:
Filter
series
Filter
series
Seal Kit code number Seal Kit code numberFilter
element
Filter
elementNBR NBRFPM FPM
See
order
table
See
order
table
2 2
Q.ty: 1 pc. Q.ty: 1 pc.Q.ty: 2 pc. Q.ty: 2 pc.Q.ty: 1 pc. Q.ty: 1 pc.
(3a ÷ 3f) (3a ÷ 3h)
3 34 4
Indicator connection plug Indicator connection plug
NBR NBRFPM FPM
T2H T2HT2V T2V02050588 0205059002050589 02050591
FHF 325
A-B-C-G-H
FHF 325
M-N
FHF 325 FHF 325
Connections
A - B - C - G - H
Connections
M - N
3f
3f
3a
3b
3c
3a
3f
3d
3e
2
4
3b
3f
3a
3b
3c
3f
3a
3b
3f
3d
3e
3g
3h
2
4
FHF 325
Order number for spare parts
High Pressure  lters
560