Page 30 - Parker - The Handbook of Hydraulic Filtration
P. 30
Types & Locations of Filters
Filtration Fact Filter Types and Locations
▼ Suction ▼ Return
Suction strainers are often ▼ Pressure ▼ Off-line
referred to by “mesh” size:
Suction Filters
60 mesh = 238 micron
Suction filters serve to pro-
100 mesh = 149 micron To System
tect the pump from fluid
200 mesh = 74 micron contamination. They are Suction
located before the inlet Filter
port of the pump. Some
Filtration Fact may be inlet “strainers”,
submersed in the fluid.
Others may be externally
The use of suction filters
mounted. In either case,
and strainers has greatly
they utilize relatively
decreased in modern coarse elements, due to
cavitation limitations of
filtration.
pumps. For this reason,
they are not used as prima-
ry protection against contamination. use of a suction filter. Always consult
Some pump manufactures do not rec- the pump manufacturer for inlet
ommend the restrictions.
Pressure Filters
Pressure filters are To System
located downstream
Pressure
from the system pump.
Filter
They are designed to
handle the system
pressure and sized for
the specific flow rate
in the pressure line
where they are
located.
Pressure filters are
especially suited for
protecting sensitive
components directly downstream from they also help protect the entire system
the filter, such as servo valves. Located from pump generated contamination.
just downstream from the system pump,
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