TXV - Presentation
TXV series
pumps with
control
variable displacement piston pumps
► TXV series pumps are variable displacement with pressure-ow control – called Load Sensing.
They self-regulate to give just the ow required for each movement.
► Specically designed for the needs of the truck hydraulics market, TXV pumps are particularly
well adapted for applications in:
▪ loader cranes,
▪ forestry cranes,
▪ refuse vehicles,
▪ salt spreaders, snow and ice equipment,
▪ construction equipment vehicles.
► Extremely compact in size to allow direct ange-mounting on vehicle engine or gearbox PTOs.
► TXV pumps are available in 11 models with maximum displacement from 40 to 150 cc/rev.
Maximum pressure is up to 420 bar depending on model.
ADVANTAGES
TXV series
Variable displacement - TXV
Why use a variable
displacement pump?
► Installing a TXV variable displacement pump will transform your hydraulic equipment.
Slow or rapid movements are done with precision, due to the constant adjustment of pump ow rate.
► The pump incorporates a load sensing device to control ow and maximum pressure.
This control device is piloted by a proportional valve which informs the pump of the ow needed for the
different circuits supplied by the pump, independently of pressure.
Q
Time
For slow and precise movements, the pump adjusts its ow to whatever
the user needs, whilst also controlling maximum circuit pressure.
Oil heating and lamination, and noise level, are considerably reduced
compared to a xed displacement pump.
The motor driving the pump only provides the power actually
needed by the equipment, thus ensuring:
For rapid movements, the pump supplies the
required ow virtually instantaneously.
1 & 3
longer service life of that equipment;
signicant gains in energy consumption;
and overall a more environmentally friendly solution.
2
The proportional movement of
the control lever is perfectly
reproduced by the pump.
2 Quick
3 Slow
and precise
1 Slow
and precise
TXV - How does it work ?
Standby pressure
setting
Direct return to tank
(drain)
Pump pilot
pressure line (LS)
Max. pump output pressure (PC)
► TXV variable displacement pumps are of axial piston design with 11 pistons, thus ensuring optimal regularity
of ow and a low noise level.
► The displacement of the pump is proportional to the stroke of the pistons.
Displacement – and thus ow - is varied by changing the angle α of the swashplate (Fig.1).
► To change displacement from maximum to zero (complete ow cancellation),
the swashplate angle goes from α max (Fig. 1) to α min (=0) (Fig. 2).
► Setting the servo pump.
Figure 2 - zero displacement
Bleed screw
Swashplate
Bleed screw
Swashplate
α max
Figure 1 - Maximum displacement
TXV series
Pressure-flow regulation: "Load Sensing" - TXV
► Zero flow (standby)
The proportional valve is closed.
The pressure in the P line increases until it reaches the value at which
the standby spring is set.
Under the pressure in the P line, the spool moves and oil ow supplies
the setting piston which moves the swashplate into vertical position
(angle
α =0): no ow, but standby pressure is maintained.The pump
stays in standby mode.
► Full flow
The proportional valve is fully open, allowing passage of pump ow.
The pressure in the LS line is the same as in the P line.
Hydraulic pressure is the same on either side of the spool.
The standby spring holds the spool in its closed position.
The cancellation piston is not supplied with oil.
The swashplate is at maximum angle
α: the pump is at full
displacement.
► Flow control
As soon as the proportional valve tends to reduce the ow
requested by the user, the pressure drop created allows the pump
displacement setting piston to be piloted.
This setting piston automatically adjusts pump displacement to match
the order given by the proportional valve.
► Zero flow (maximum pressure)
This is the case for example of a cylinder which arrives at a
mechanical stop. The proportional valve is still open.
The pressure of the cylinder at a mechanical stop is sensed by the
pump pressure relief valve which opens at the set pressure (PC).
This allows the pump displacement setting piston to be supplied and
the pump sets itself to a displacement just sufcient to maintain the
circuit pressure.
LS line
Spool
Stand-by spring
Cancellation piston
Swashplate
P line
LS line
P line
LS Line
P line
LS line
P line
TXV - Characteristics
TXV pumps are available in 11 models from 40 to 150 cc/rev maximum displacement.
Pump
reference
Direction
of rotation
Maximum
displac.
(1)
Max. opera-
ting pressure
Max. peak
pressure
(intermittent:
5%)
Torque at
300 bar
(2)
Max.speed
at full displa-
cement
(3)
Max.speed
in stand-by
Weight
Overhang
torque
(4)
(cc/rev) (bar) (bar) (N.m) rpm rpm (kg) (N.m)
► Standard pump range
TXV 40
0512950
0512955
CW
CCW
40 400 420 225 3000 3000 26 34
TXV 60
0512500
0512505
CW
CCW
60 400 420 335 2600 3000 26 34
TXV 75
0512510
0512515
CW
CCW
75 400 420 420 2000 3000 26 34
TXV 92
0512520
0512525
CW
CCW
92 400 420 515 1900 3000 26 34
TXV 120
0515700
0515705
CW
CCW
120 380 400 675 2100 3000 26 34
TXV 130
0515300
0515515
CW
CCW
130 365 380 730 2100 3000 28,2 38,6
TXV 150
0518600
0518605
CW
CCW
150 310 330 840 2000 3000 28,2 38,6
TXV 130
0520300 CW/CCW 130 365 380 730 1750 3000 29,3 42
TXV 150
0525070 CW/CCW 150 310 330 840 1750 3000 29,3 42
► With through shaft
TXV 130
0518700
0518705
CW
CCW
130 365 380 730 1900 3000 31,1 47,4
(1) TXV pumps can be set for smaller maximum displacements (see page 41).
(2) For a mechanical efciency at 85%.
(3) Higher speed - at full displacement - possible depending on ow required : please contact us.
Viscosity affects maximum possible rotating speed. If viscosity > 400 cSt, please contact us to obtain corresponding speed possibilities.
series: see pages 34 and 35.
(4) Value of the overhang torque of the only pump.
► Ideal installation
► Calculation of power to be supplied to the shaft as a function of flow and pressure
Calculation of torque to determine PTO,
as a function of the displacement and the pressure
Splined shaft: 8-32-36
DIN ISO 14 - NF 22.131
Fr
Fa
=
=
► Force on pump shaft
Fr : Acceptable max. radial force = 3000 N
Fa : Acceptable axial force = 1600 N.
C=
Cyl x ∆P
62.8 x ŋ
méca
Avec :
P
= Hydraulic power in kW
∆P = Differential pressure in bar
Q = Flow in l/min
C = Torque in N.m
Cyl = Displacement in cc/rev
ŋ
méca
= Mechanical efciency
ŋ
global
= Mechanical efciency + volumetric efciency
Application
circuit
Return to the tank
Drain line
Inlet line
Outlet line
Pilot line
P
=
∆P x Q
600
x ŋ
global
TXV series
Attention: the TXV indexables pumps are limited at 1750 rpm maximum.
!
0
50
100
150
200
250
300
0
500 1000 1500 2000 2500 3000
TXV 150
TXV 150
TXV 130
TXV 130*
TXV 120
TXV 92
TXV 75
TXV 60
TXV 40
*TXV 130 with through shaft
limited at 1900 rpm.
Q (l/min)
N (rpm)
Performance - TXV
► Torque absorbed as a function of pump output pressure (with a mechanical efciency considered at 85%)
► Flow as a function of rotating speed
► Volumetric efficiency
Flow as a function of speed, with pump in maximum displacement position and oil level in tank above the pump.
These graphs are the results of testwork done in HYDRO LEDUC R&D laboratory, on a specic test bench
with a mineral hydraulic uid ISO VG46 at 25°C (~100 cSt) - disregarding the volumetric efciency.
TXV 150 / TXV 150
TXV 130
/ TXV 130*
TXV 120
TXV 92
TXV 75
TXV 60
TXV 40
* TXV with through shaft
Torque (N.m)
Pressure (bar)
0
100
200
300
400
500
600
700
800
900
0 50 100 150 200 250 300 350 400 450
2001000
90
100
%
300 360
Efficiency at 1500 rpm
Pressure (bar)
View from F View from F
CW CCW
A
25
6.45 29
B
28
36
Outlet
Inlet
Connection for
pressure gauge G1/4"
M10x1.5-6H (2x)
Depth 15 mm to
attach support device
A
25
6.45
29
B
28
36
Outlet
Inlet
TXV 40 to 120 - Dimensions
TXV 40 TO 120
80 f7
194
9
55.1
331.1
276
Splined shaft: 8-32-36
DIN ISO 14 - NF 22.131
(DIN 5462)
Drain G3/8’’
connected to tank
Connection
for pressure gauge G1/4’’
F
40
80
40
80
125
M12x1.75-6H
12.75 (4x)
LS G1/4"
stand-by pressure
setting
247.8
Max. pressure setting (PC)
► TXV connections
Pump
reference
Outlet Inlet A B
(Ø) (Ø) (mm) (mm)
TXV 40 to 92 G 3/4"
G 1"1/2
15 19
TXV 120 G 1" 6 23.57
► Support device
In cases where it is necessary to use a support device (overhang
torque) for the pump, this must be xed to the same part which the
pump is mounted on.
Dimensions in mm.
L
M
*Support device
Centre of gravity
Screw M10
* This support has to be designed to avoid strain on the pump flange.
► Mass and position of centre of gravity
Pump type
L
(mm)
Weight
(kg)
Overhang
torque
(N.m)
TXV 40 à 92 130 26 34
TXV 120 130 26 34
TXV 130 et TXV 150 128 28.2 38.6
TXV 130 et TXV 150
128 29.3 42
TXV 130 with through shaft 152.6 31.1 47.4
TXV 130 constant torque 143 28.3 40
TXV series
Dimensions - TXV 150
TXV 150
Inlet G1 1/2"
29.4 37
32
5050
Connection for
pressure gauge G1/4"
Outlet G1"
M10x1.5-6H (2x)
Depth 15mm to
attach support device
View from F View from F
CW CCW
219
321.1
Ø 80 f7
55.1
9
277
266
Splined shaft: 8-32-36
DIN ISO 14 - NF 22.131
(DIN 5462)
Standby pressure setting
Maximum pressure setting
Drain G3/8"
to be connected to tank
Connection for
pressure gauge G1/4"
F
M12x1,75-6H
80
80
127
40
40
LS G1/4"
F
Ø 12,75 (4x)
Dimensions in mm.
TXV 130 with through shaft - Dimensions
The TXV 130 pump exists in a “through shaft” version.
With side porting for inlet and output, this “through shaft” TXV 130 conguration means any LEDUC TXV pump, or xed displacement XP
or PA pump, can be mounted on the back.
The maximum displacement of the “through shaft” TXV 130 can be factory set, on request, between 60 and 130 cc/rev.
It is important to check that maximum torque to be transmitted by the shaft of the “through shaft” TXV 130 does not exceed 900 N.m.
TXV 130 THROUGH SHAFT PUMP
228
382.6
Ø 80 f7
55.1
9
281.5
327.5
57.1
Splined shaft: 8-32-36
DIN ISO 14 - NF 22.131
(DIN 5462)
F
E
Splined hub: 8-32-36
DIN ISO 14 - NF 22.131
27
15
M10x1.5-6H (2x)
Depth 15mm
to attach support device
Connection for
pressure gauge G1/4"
M12x1.75-6H
80
80
127
40
40
LS G1/4"
View from E
(Shaft side)
80
40
Inlet G1 1/2
"
View from F
(Hub side)
Outlet G1"
Interface to mount
TXV, XPi, PA pumps
Connection for
pressure gauge G1/4"
Standby pressure setting
Maximum pressure setting
Drain G3/8" to be
connected to tank
Ø 12.75 (4x)
Interface to mount TXV, XPi, PA pumps
(splines 8-32-36 DIN ISO 14 - NF E 22.131)
Dimensions in mm.
TXV series
Dimensions - TXV 130 with through shaft
Outlet G1"
Outlet G1"
Inlet G1 1/2"
Inlet
G1 1/2"
CW
CCW
View from F (see p.30)
TXV 130 THROUGH SHAFT PUMP
► Support device
The support device for the pump must be xed to the same part which the pump is mounted on (see diagram below) and has to be designed
to avoid strain on the pump ange.
Maximum torque transferable by the shaft
of the pump driven by the PTO:
C = 900 N.m
That is, the sum of torque for both pumps must be < 900 N.m.
Please consult our Technical Department for advice regarding your installations.
Support device
Example of two TXV pumps.
C
Example of TXV with a PA pump.
C
Example of TXV with a XPi pump.
C
