1. PISTON PUMPS Steve Skinner, Eaton Hydraulics, Havant, UK
Copyright  Eaton Hydraulics 2000

2. PISTON PUMPS
Introduction
Products

3. CYLINDER BLOCK AND PISTON

4. CYLINDER BLOCK AND PISTON

5. PISTON SHOE

6. ROTATING GROUP

7. PISTON PUMP PRINCIPLE

8. FIXED DISPLACEMENT AXIAL PISTON PUMP1 2

9. Q FIXED DISPLACEMENT PISTON PUMP
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)

10. Q VARIABLE DISPLACEMENT PUMP - MAX FLOW STROKE
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)

11. Q VARIABLE DISPLACEMENT PUMP - REDUCED FLOW STROKE
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)

12. VARIABLE DISPLACEMENT PUMP - REDUCED FLOW
STROKE Q
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)

13. VARIABLE DISPLACEMENT PUMP - ZERO FLOW
STROKE Q
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)

14. VARIABLE DISPLACEMENT PUMP - ZERO FLOW
STROKE
Q = (No. of Pistons) x (Piston Size) x (Piston Stroke) x (Drive Speed)

15. VARIABLE DISPLACEMENT PUMP - REVERSED FLOWQ

16. SINGLE OPERATING PISTON

17. DOUBLE ACTING OPERATING PISTON

18. DUAL OPERATING PISTON

19. PERPENDICULAR OPERATING PISTON

20. SWASH PLATE BEARING
PINTLE
SADDLE

21. PISTON SHOE LUBRICATION

22. PISTON SHOE LUBRICATION

23. TYPICAL CONSTRUCTION

24. TYPICAL CONSTRUCTION

25. OPEN LOOP TRANSMISSION

26. OPEN LOOP TRANSMISSION

27. OPEN LOOP TRANSMISSION

28. OPEN LOOP TRANSMISSION

29. OVER CENTRE OPEN LOOP TRANSMISSION

30. CLOSED LOOP TRANSMISSION

31. CLOSED LOOP TRANSMISSION

32. CLOSED LOOP TRANSMISSION

33. CLOSED LOOP TRANSMISSION

34. CLOSED LOOP TRANSMISSION

35. CLOSED LOOP TRANSMISSION

36. TYPICAL CLOSED LOOP CIRCUITRY

37. DISPLACEMENT CONTROL OPTIONS
DIRECT DISPLACEMENT CONTROL:
Manual
Electric Motor
Pilot pressure
Electronic
PRESSURE / DISPLACEMENT CONTROL:
Pressure Compensation
Load Sensing
Constant Power
CONTROL

38. MANUAL DISPLACEMENT CONTROLQ

39. ELECTRIC DISPLACEMENT CONTROLQ
~8 sec
~40 sec M M

40. ELECTRONIC DISPLACEMENT CONTROLQ U
tMIN ~ 300 mS mS U

41. PILOT PRESSURE DISPLACEMENT CONTROLQ
PP (bar) 10 40 PP

42. PRESSURE COMPENSATIONQ P

43. LOAD SENSING Q P P1 P2 P2 P1

44. POWER LIMITING Q P
P.Q

45. AXIAL PISTON PUMP CHARACTERISTICS
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.

46. PISTON PUMPS
Introduction
Products

47. PVB SERIES Classic product Single control piston
No separate valve plate
Pintle bearing yoke
Fixed displacements up to 95 cm3/rev.
140 bar
210 bar 11 14 21 33 43 62 95
198
cm3 / rev

48. 25 41 45 cm3 / rev PVE SERIES Mainly mobile applications
Single control piston
Pintle bearing yoke
Through drive option
Integral vane pump option.
185 bar
CONTROLS
Pressure compensator
Load sensing
Remote compensator
Electric dual setting compensator
Accumulator unloading compensator
210 bar 25 41 45
cm3 / rev

49. PVQ SERIES
Industrial pump range comprising quietened versions of PVB & PVE
Single control piston
Pintle bearing yoke.
140 bar
CONTROLS
Pressure compensator
Load sensing
Remote compensator
Electric dual setting compensator
Accumulator unloading compensator
185 bar
210 bar 11 14 21 25 33 41 45
cm3 / rev

50. TA 19 SERIES TRANSMISSION PUMPS
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.
41 cm3/rev
cm3/rev
PMAX
210
350
bar
psi
3000
5000

51. PVH SERIES 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.
250 bar 57 74 98
131
cm3 / rev

52. PVM SERIES PMAX 230 bar Range PMAX
psi
280
4000
250
3600
230
3300
230 bar
Range
bar
PMAX
psi
Low noise Industrial and Mobile pump series
Single control piston
Saddle bearing yoke
200% through drive capability.
350
5000
320
4600
280
4000
280 bar
Range

53. PVM SERIES - 230 bar - 280 bar 141 cm3/r 106 81 63 50 32 20

54. PMAX PVX SERIES HYDROKRAFT PUMPS
High pressure open loop pumps for industrial applications
Wide range of control options
Saddle bearing yoke with single axial control piston.
PMAX
420 bar
350 bar

55. PMAX 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

56. cm3/rev PVX & PVW SERIES OPEN LOOP PUMPS PVW PVX 250 360 500 750 66 90
130
180
PVX
PVW

57. PMAX 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

58. TVW SERIES CLOSED LOOP PUMPS
cm3/rev
130
180
250
360
500
750
TVW

59. INTEGRATED MOTOR PUMP
An oil-cooled electric motor and pump assembly mounted within a noise reducing shroud

60. INTEGRATED MOTOR PUMP
An oil-cooled electric motor and pump assembly mounted within a noise reducing shroud

61. INTEGRATED MOTOR PUMP
An oil-cooled electric motor and pump assembly mounted within a noise reducing shroud

62. INTEGRATED MOTOR PUMP 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 HP

63. PISTON PUMP RANGE PRESSURE CAPABILITY DISPLACEMENT PVX / PVW PVM PVH
PVQ
PVE
DISPLACEMENT

64. PISTON PUMPS Steve Skinner, Eaton Hydraulics, Havant, UK
Copyright  Eaton Hydraulics 2000