Engineering Fluid Diagrams and Prints
DOE-HDBK-1016/1-93
FLUID POWER P&IDs
FLUID POWER P&IDs
Fluid power diagrams and schematics require an independent review because they
use a unique set of symbols and conventions.
EO 1.11
IDENTIFY the symbols used on engineering fluid power
drawings for the following components:
a. Pump
d. Actuators
b. Compressor
e. Piping and piping junctions
c. Reservoir
f. Valves
EO 1.12
Given a fluid power type drawing, DETERMINE the operation
or resultant action of the stated component when hydraulic
pressure is applied/removed.
Fluid Power Diagrams and Schematics
Different symbology is used when dealing with systems that operate with fluid power. Fluid
power includes either gas (such as air) or hydraulic (such as water or oil) motive media. Some
of the symbols used in fluid power systems are the same or similar to those already discussed,
but many are entirely different.
Figure 19 Fluid Power Pump and
Compressor Symbols
Fluid power systems are divided into five basic parts:
pumps, reservoirs, actuators, valves, and lines.
Pumps
In the broad area of fluid power, two categories of
pump symbols are used, depending on the motive
media being used (i.e., hydraulic or pneumatic). The
basic symbol for the pump is a circle containing one
or more arrow heads indicating the direction(s) of
flow with the points of the arrows in contact with the
circle. Hydraulic pumps are shown by solid arrow
heads. Pneumatic compressors are represented by
hollow arrow heads. Figure 19 provides common
symbols used for pumps (hydraulic) and compressors
(pneumatic) in fluid power diagrams.
Rev. 0
PR-02
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