System Circuit Diagram; Graphic Symbols For Hydraulic Circuits - Sakai R2-4 Shop Manual

HYDRAULIC SYSTEMS

1. SYSTEM CIRCUIT DIAGRAM

1-1. Graphic Symbols for Hydraulic Circuits

Basic Symbols
DESCRIPTION
Lines:
Main working
Pilot control
Drain or bleed
Lines, joining
Not connected
Component outline
Arrow indicates direction
of flow.
Line with fixed restriction
(orifice).
Test port, pressure
measurement.
Temperature measure-
ment gauge
Pressure measurement
gauge
Reservoir (vented)
Filter or strainer
Heat exchanger, lines in-
dicate flow of coolant.
Quick disconnect:
Connected with mechan-
ically opened checks.
Disconnected.
Sloping arrow through a
symbol at 45° indicates
that a component can be
adjusted or varied.
4-001
Pump, Motors and Cylinders
SYMBOL
Hydraulic pumps:
Fixed displacement
Variable displacement
Hydraulic Motor:
Double acting hydraulic
cylinder
Differential cylinder
Electric motor
DESCRIPTION
Unidirectional
Bidirectional
Unidirectional
Bidirectional
Variable displace-
ment pressure com-
pensated
Unidirectional
Unidirectional
Bidirectional
SYMBOL