Section E - Hydraulics
E-3 E-3
9803-9570-4
Operation Description
Introduction to Hydraulic Schematic Symbols
TE-001
General (Basic and Functional Symbols)
Complex hydraulic components and circuits can be
described to the engineer by using graphical symbols. The
following pages illustrate and give a brief description for
some of the more common symbols used.
There are many symbols in use and it would be impossible
to include them all here. However it should be noted that
most are only variations or refinements on the basic
principles explained here. If more detailed information is
required you are recommended to obtain a copy of
BS2917 or IS01219.
Once familiar with the symbols, the engineer can use
hydraulic circuit diagrams as an aid to fault finding. It will
be possible to see the complete hydraulic circuit and
decipher the relationship between hydraulic components.
Table 1. General
Table 2. Rams
Table 3. Pumps and Motors
Spring
Flow restriction affected by
viscosity
Direction of flow
Indication of rotation
Indication of direction and
paths of flow
Variable control
Single acting
Double acting
Double ended
Double acting with damping
at rod area end
Variable capacity pump two
directions of flow
Fixed capacity motor one
direction of flow
Fixed capacity motor two
directions of flow
Variable capacity motor one
direction of flow
Variable capacity motor two
directions of flow
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