Loading...Proportional Hydraulics Textbook
Learning System for Automation and Communications
Festo Didactic
Chapter 1
Introduction to proportional hydraulics B-3
Table of contents
1.1 Hydraulic feed drive with manual control B-6
1.2 Hydraulic feed drive with electrical control
and switching valves B-7
1.3 Hydraulic feed unit with electrical control
and proportional valves B-8
1.4 Signal flow and components of proportional hydraulics B-10
1.5 Advantages of proportional hydraulics B-12
Chapter 2
Proportional valves: Design and mode of operation B-15
2.1 Design and mode of operation of a proportional solenoid B-17
2.2 Design and mode of operation of
proportional pressure valves B-22
2.3 Design and mode of operation of proportional
flow restrictors and directional control valves B-25
2.4 Design and mode of operation of proportional
flow control valves B-28
2.5 Proportional valve designs: Overview B-30
Chapter 3
Proportional valves: Characteristic curves and parameters B-31
3.1 Characteristic curve representation B-33
3.2 Hysteresis, inversion range and response threshold B-34
3.3 Characteristic curves of pressure valves B-36
3.4 Characteristic curves of flow restrictors and
directional control valves B-36
3.5 Parameters of valve dynamics B-42
3.6 Application limits of proportional valves B-46
Chapter 4
Amplifier and setpoint value specification B-47
4.1 Design and mode of operation of an amplifier B-51
4.2 Setting an amplifier B-56
4.3 Setpoint value specification B-59
B-1
Basics
TP701 • Festo DidacticChapter 5
Switching examples using proportional valves B-63
5.1 Speed control B-65
5.2 Leakage prevention B-71
5.3 Positioning B-71
5.4 Energy saving measures B-73
Chapter 6
Calculation of motion sequence for a
hydraulic cylinder drive B-79
6.1 Flow calculation for proportional
directional control valves B-85
6.2 Velocity calculation for an equal area
cylinder drive disregarding load and
frictional forces B-87
6.3 Velocity calculation for an unequal area
cylinder drive disregarding load and
frictional forces B-91
6.4 Velocity calculation for an equal area
cylinder drive taking into account load and
frictional forces B-98
6.5 Velocity calculation for an unequal
cylinder drive taking into account load and
frictional forces B-104
6.6 Effect of maximum piston force on the
acceleration and delay process B-111
6.7 Effect of natural frequency on the acceleration
and delay process B-115
6.8 Calculation of motion duration B-119
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