Specifications

Fluid Service Catalog
4
Finding the cleanliness level required by a system
1. Starting at the left hand column, select the most sensitive component used in the system.
2. Move to the right to the column that describes the system pressure and conditions.
3. Here you will find the recommended ISO class level, and recommended element micron rating.
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available on our ISO Cleanliness Guidelines poster.
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Low/Medium Pressure
Under 2000 psi
(moderate conditions)
High Pressure
2000 to 2999 psi
(low/medium with
severe conditions
1
)
Very High Pressure
3000 psi and over
(high pressure with
severe conditions
1
)
ISO Target
Levels
Micron
Ratings
ISO Target
Levels
Micron
Ratings
ISO Target
Levels
Micron
Ratings
Pumps
Fixed Gear or Fixed Vane
20/18/15 20 19/17/14 10 18/16/13 5
Fixed Piston
19/17/14 10 18/16/13 5 17/15/12 3
Variable Vane
18/16/13 5 17/15/12 3 not applicable not applicable
Variable Piston
18/16/13 5 17/15/12 3 16/14/11 3
(2
Valves
Check Valve
20/18/15 20 20/18/15 20 19/17/14 10
Directional (solenoid)
20/18/15 20 19/17/14 10 18/16/13 5
Standard Flow Control
20/18/15 20 19/17/14 10 18/16/13 5
Cartridge Valve
19/17/14 10 18/16/13 5 17/15/12 3
Proportional Valve
17/15/12 3 17/15/12 3 16/14/11 3
(2
Servo Valve
16/14/11 3
(2
16/14/11 3
(2
15/13/10 3
(2
Actuators
Cylinders, Vane Motors,
Gear Motors
20/18/15 20 19/17/14 10 18/16/13 5
Piston Motors, Swash Plate
Motors
19/17/14 10 18/16/13 5 17/15/12 3
Hydrostatic Drives
16/15/12 3 16/14/11 3
(2
15/13/10 3
(2
Test Stands
15/13/10 3
(2
15/13/10 3
(2
15/13/10 3
(2
Bearings
Journal Bearings
17/15/12 3 not applicable not applicable not applicable not applicable
Industrial Gearboxes
17/15/12 3 not applicable not applicable not applicable not applicable
Ball Bearings
15/13/10 3
(2
not applicable not applicable not applicable not applicable
Roller Bearings
16/14/11 3
(2
not applicable not applicable not applicable not applicable
1. Severe conditions may include high flow surges, pressure spikes, frequent cold starts, extremely heavy duty use, or the presence of water
2. Two or more system filters of the recommended rating may be required to achieve and maintain the desired Target Cleanliness Level.
ISO Cleanliness Levels