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PISTON PUMPS
Copyright Eaton Hydraulics 2000
Steve Skinner, Eaton Hydraulics, Havant, UK
Introduction
Products
PISTON PUMPS
CYLINDER BLOCK AND PISTON
CYLINDER BLOCK AND PISTON
PISTON SHOE
ROTATING GROUP
PISTON PUMP PRINCIPLE
FIXED DISPLACEMENT AXIAL PISTON PUMP
1
2
FIXED DISPLACEMENT PISTON PUMP
Q
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)
Q
STROKE
VARIABLE DISPLACEMENT PUMP - MAX FLOW
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)
STROKE
Q
VARIABLE DISPLACEMENT PUMP - REDUCED FLOW
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)
STROKE
Q
VARIABLE DISPLACEMENT PUMP - REDUCED FLOW
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)
Q
STROKE
VARIABLE DISPLACEMENT PUMP - ZERO FLOW
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)
STROKE
VARIABLE DISPLACEMENT PUMP - ZERO FLOW
Q
VARIABLE DISPLACEMENT PUMP - REVERSED FLOW
SINGLE OPERATING PISTON
DOUBLE ACTING OPERATING PISTON
DUAL OPERATING PISTON
PERPENDICULAR OPERATING PISTON
PINTLE
SADDLE
SWASH PLATE BEARING
PISTON SHOE LUBRICATION
PISTON SHOE LUBRICATION
TYPICAL CONSTRUCTION
TYPICAL CONSTRUCTION
OPEN LOOP TRANSMISSION
OPEN LOOP TRANSMISSION
OPEN LOOP TRANSMISSION
OPEN LOOP TRANSMISSION
OVER CENTRE OPEN LOOP TRANSMISSION
CLOSED LOOP TRANSMISSION
CLOSED LOOP TRANSMISSION
CLOSED LOOP TRANSMISSION
CLOSED LOOP TRANSMISSION
CLOSED LOOP TRANSMISSION
CLOSED LOOP TRANSMISSION
TYPICAL CLOSED LOOP CIRCUITRY
DIRECT DISPLACEMENT
CONTROL:
 Manual
 Electric Motor
 Pilot pressure
 Electronic
DISPLACEMENT CONTROL OPTIONS
CONTROL
PRESSURE / DISPLACEMENT
CONTROL:
 Pressure Compensation
 Load Sensing
 Constant Power
Q
MANUAL DISPLACEMENT CONTROL
ELECTRIC DISPLACEMENT CONTROL
M
Q
~8 sec ~40 sec
M
ELECTRONIC DISPLACEMENT CONTROL
U
Q
U
tMIN ~ 300 mS - 1000 mS
PILOT PRESSURE DISPLACEMENT CONTROL
PP
Q
PP (bar)
10 40
PRESSURE COMPENSATION
Q
P
LOAD SENSING
P2
P1
Q
PP1P2
POWER LIMITING
Q
P
P.Q
 Displacements to
750+ cm3/r
 Pressure capabilities
to 350/400 bar
 High noise level
 Sensitive to poor inlet
conditions &
contamination
 High overall efficiency
 Good life expectancy
 Large, bulky units
 Good fluid
compatibility
 High cost.
AXIAL PISTON PUMP CHARACTERISTICS
Introduction
Products
PISTON PUMPS
210 bar
140 bar
11 14 21 33 43 62 95 198
cm3 / rev
Classic product
Single control piston
No separate valve plate
Pintle bearing yoke
Fixed displacements up to 95 cm3/rev.
PVB SERIES
PVE SERIES
Mainly mobile applications
Single control piston
Pintle bearing yoke
Through drive option
Integral vane pump option.
25
210 bar
185 bar
cm3 / rev
41 45
CONTROLS
 Pressure compensator
 Load sensing
 Remote compensator
 Electric dual setting
compensator
 Accumulator unloading
compensator
PVQ SERIES
210 bar
140 bar
11
cm3 / rev
14 21 25 33 41 45
Industrial pump range comprising
quietened versions of PVB & PVE
Single control piston
Pintle bearing yoke.
CONTROLS
 Pressure compensator
 Load sensing
 Remote compensator
 Electric dual setting
compensator
 Accumulator unloading
compensator
185 bar
TA 19 SERIES TRANSMISSION PUMPS
PMAX
210
350
bar psi
3000
5000
41 cm3/rev
41 + 41 cm3/rev
Medium duty hydrostatic
transmission for mobile
applications
Single and double units
with integral charge and
auxiliary pumps
Based on PVE open loop
pump
Aluminium body
Typical applications include
fork lift trucks and skid-
steer loaders.
PVH SERIES
250 bar
57
cm3 / rev
74 98 131
Industrial and mobile
pump range
Wide range of control
options (including
torque limiting)
Control piston plus bias
piston
200% through drive
capability
Saddle bearing yoke.
PVM SERIES
PMAX
230
230 bar
Range
250
280
3300
3600
4000
bar psi
PMAX
280
320
350
4000
4600
5000
bar psi
Low noise Industrial and Mobile
pump series
Single control piston
Saddle bearing yoke
200% through drive capability.
280 bar
Range
PVM SERIES
20
32
50
63
81
106
141 cm3/r
18 28 45 57 74 98 131 cm3/r
- 230 bar
- 280 bar
PVX SERIES HYDROKRAFT PUMPS
PMAX
420 bar
350 bar
High pressure open
loop pumps for
industrial applications
Wide range of control
options
Saddle bearing yoke
with single axial
control piston.
PVW SERIES HYDROKRAFT PUMPS
High pressure open
loop pumps for
industrial applications
Wide range of control
options
Saddle bearing yoke
with perpendicular
control piston
Suitable for larger
displacements and
multiple units.
PMAX
420 bar
350 bar
cm3/rev
250 360 500 75066 90 130 180
PVX
PVW
PVX & PVW SERIES OPEN LOOP PUMPS
TVW SERIES HYDROKRAFT TRANSMISSION PUMPS
High pressure closed
loop pumps for
industrial applications
Wide range of control
options
Saddle bearing yoke
with perpendicular
control piston
Integral pilot and
charge pump options.
PMAX
420 bar
350 bar
cm3/rev
130 180 250 360 500 750
TVW
TVW SERIES CLOSED LOOP PUMPS
INTEGRATED MOTOR PUMP
 An oil-cooled electric motor and pump assembly mounted within
a noise reducing shroud
INTEGRATED MOTOR PUMP
 An oil-cooled electric motor and pump assembly mounted within
a noise reducing shroud
INTEGRATED MOTOR PUMP
 An oil-cooled electric motor and pump assembly mounted within
a noise reducing shroud
Significant noise and
space reductions
Suitable for standard
single or multiple vane
or piston pumps
Access port for pump
control adjustments
Available in five power
sizes from 15 to 92 kW.
kW - 15 22 45 75 92
HP - 20 30 60 100 125
INTEGRATED MOTOR PUMP
PVX / PVW
PVM
PVH
PVQ
PVE
DISPLACEMENT
PRESSURE
CAPABILITY
PISTON PUMP RANGE
PISTON PUMPS
Copyright Eaton Hydraulics 2000
Steve Skinner, Eaton Hydraulics, Havant, UK

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Piston pumps