Training Hydraulic Circuits
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BOMAG FAYAT GROUP
TRAINING
Hydraulic Circuits
by winni
BOMAG FAYAT GROUP
Hydraulic Circuits
Open loop circuit,
Closed loop circuit,
Typical features of open loop circuit are:
Typical features of closed loop circuits are:
1) Suction lines
1) Directional valves
Large diameters, small lengths 2) Directional valves
Sizes dependent on flow 3) Filters / coolers
Small sizes for pilot operation 2) Filter / coolers
Small openings to flow / small sizes 3) Tank size
Cross – sectional areas / sizes dependent on
Small – determined only by flow of auxiliary pumps
flow
and system flow
4) Tank size Multiple of max. pump flow in litres
5) Pump arrangement Next to or under the tank 6) Drive speeds Limited by amount of suction 7) Unloading in the return line via valves
4) Speeds High limits due to anti – cavitation
5) Arrangement / installation position Any 6) Drive Completely reversible through zero position 7) Support of loads Via drive motor 8) Return of braking energy
by winni
BOMAG FAYAT GROUP
Hydraulic Circuits
Pumps supply the quantity of liquid only Pressure ist build up by restrictions
Restrictions are: motors, cylinders etc.
by winni
BOMAG FAYAT GROUP
TRAINING
open loop circuit
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Open loop circuit Basic system with hydraulik pump and motor. single direction working line Pressure relief valve for protection against overload
Fixed displacement pump
Fixed displacement motor
Hydraulic oil filter
Hydraulic oil cooler
Hydraulic oil tank
by winni
motor case flow
suction flow
pump case flow
return flow to tank
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Open loop circuit Basic system with hydraulik pump and motor. single direction working line high pressure Pressure relief valve for protection against overload
Fixed displacement pump
Fixed displacement motor
Hydraulic oil filter
Hydraulic oil cooler
Hydraulic oil tank
suction flow by winni
case flow / leakage
high pressure
motor case flow
suction flow
pump case flow
return flow to tank
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Open loop circuit Basic system with hydraulik pump and motor. single direction working line high pressure Pressure relief valve for protection against overload
Fixed displacement pump
Fixed displacement motor
Hydraulic oil filter
Hydraulic oil cooler
Hydraulic oil tank
suction flow by winni
case flow / leakage
high pressure
motor case flow
suction flow
pump case flow
return flow to tank
BOMAG FAYAT GROUP
TRAINING
closed loop circuit
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
7
8
4
6
Q max
Q max
3
Q min 0
5 2
Q max
10 4
11
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
suction flow
Diesel engine is running – pump is in neutral position
12
charge pressure case flow / leakage high pressure
A
8
7 4 Q max
Q max
6
3
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side A
case flow / leakage high pressure
A
8
7 4 Q max
Q max
3
6 0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side A
case flow / leakage high pressure
A
8
7 4 Q max
Q max
3
6 0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
suction flow
Diesel engine is running – pump is in neutral position
12
charge pressure case flow / leakage high pressure
A
8
7 4 Q max
Q max
6
3
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side B
case flow / leakage high pressure
A
8
7 4 Q max
3
6
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side B
case flow / leakage high pressure
A
8
7 4 Q max
3
6
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
suction flow
Diesel engine is running – pump is in neutral position
12
charge pressure case flow / leakage high pressure
A
8
7 4 Q max
Q max
6
3
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG FAYAT GROUP
TRAINING
Hydraulic Circuits Pump control by solenoid valve
by winni
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to motor
b
a solenoid valve
servo control piston
A
B
from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
from motor
b
a solenoid valve
servo control piston
A
B
to motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG FAYAT GROUP
Thank you very much for your attention.
by winni
TRAINING
Hydraulic Circuits
by winni
BOMAG FAYAT GROUP
Hydraulic Circuits
Open loop circuit,
Closed loop circuit,
Typical features of open loop circuit are:
Typical features of closed loop circuits are:
1) Suction lines
1) Directional valves
Large diameters, small lengths 2) Directional valves
Sizes dependent on flow 3) Filters / coolers
Small sizes for pilot operation 2) Filter / coolers
Small openings to flow / small sizes 3) Tank size
Cross – sectional areas / sizes dependent on
Small – determined only by flow of auxiliary pumps
flow
and system flow
4) Tank size Multiple of max. pump flow in litres
5) Pump arrangement Next to or under the tank 6) Drive speeds Limited by amount of suction 7) Unloading in the return line via valves
4) Speeds High limits due to anti – cavitation
5) Arrangement / installation position Any 6) Drive Completely reversible through zero position 7) Support of loads Via drive motor 8) Return of braking energy
by winni
BOMAG FAYAT GROUP
Hydraulic Circuits
Pumps supply the quantity of liquid only Pressure ist build up by restrictions
Restrictions are: motors, cylinders etc.
by winni
BOMAG FAYAT GROUP
TRAINING
open loop circuit
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Open loop circuit Basic system with hydraulik pump and motor. single direction working line Pressure relief valve for protection against overload
Fixed displacement pump
Fixed displacement motor
Hydraulic oil filter
Hydraulic oil cooler
Hydraulic oil tank
by winni
motor case flow
suction flow
pump case flow
return flow to tank
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Open loop circuit Basic system with hydraulik pump and motor. single direction working line high pressure Pressure relief valve for protection against overload
Fixed displacement pump
Fixed displacement motor
Hydraulic oil filter
Hydraulic oil cooler
Hydraulic oil tank
suction flow by winni
case flow / leakage
high pressure
motor case flow
suction flow
pump case flow
return flow to tank
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Open loop circuit Basic system with hydraulik pump and motor. single direction working line high pressure Pressure relief valve for protection against overload
Fixed displacement pump
Fixed displacement motor
Hydraulic oil filter
Hydraulic oil cooler
Hydraulic oil tank
suction flow by winni
case flow / leakage
high pressure
motor case flow
suction flow
pump case flow
return flow to tank
BOMAG FAYAT GROUP
TRAINING
closed loop circuit
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
7
8
4
6
Q max
Q max
3
Q min 0
5 2
Q max
10 4
11
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
suction flow
Diesel engine is running – pump is in neutral position
12
charge pressure case flow / leakage high pressure
A
8
7 4 Q max
Q max
6
3
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side A
case flow / leakage high pressure
A
8
7 4 Q max
Q max
3
6 0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side A
case flow / leakage high pressure
A
8
7 4 Q max
Q max
3
6 0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
suction flow
Diesel engine is running – pump is in neutral position
12
charge pressure case flow / leakage high pressure
A
8
7 4 Q max
Q max
6
3
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side B
case flow / leakage high pressure
A
8
7 4 Q max
3
6
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
12
suction flow charge pressure
pump is in Q max. position, oil flow out side B
case flow / leakage high pressure
A
8
7 4 Q max
3
6
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG
THE WAY TO THE COMPLETE HYDRAULIC SYSTEM
FAYAT GROUP
Closed loop circuit
suction flow
Diesel engine is running – pump is in neutral position
12
charge pressure case flow / leakage high pressure
A
8
7 4 Q max
Q max
6
3
Q min
0
5
2
Q max
10 4
B
11
suction flow
7
4) Pressure relief valve for protection against overload 5) Charge pump
9 1) Hydraulic oil tank 1
2) Variable displacement pump 3) Variable displacement motor
6) Charge pressure relief valve and check valves 7 Accessories, filter 8, cooler 9 etc. 10) Loop flushing valve and purge relief valve 11 12) To pump control
by winni
BOMAG FAYAT GROUP
TRAINING
Hydraulic Circuits Pump control by solenoid valve
by winni
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to motor
b
a solenoid valve
servo control piston
A
B
from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
from motor
b
a solenoid valve
servo control piston
A
B
to motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG
Pump control by solenoid valve
FAYAT GROUP
to or from motor
b
a solenoid valve
servo control piston
A
B
to or from motor
by winni
suction flow
control pressure
charge pressure
case flow / leakage
high pressure
BOMAG FAYAT GROUP
Thank you very much for your attention.
by winni
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