1
RA 95 546/01.93
RA
95 546/01.93
Replaces: 1.82
Power Limiting Valve LV 06
(Constant Horsepower Control)
Control Element for Series 5*
Power limiting valve LV 06 consists of a direct operated relief valve
and a stepped spool (1), which is loaded on both sides by the pilot
control spring (2) and the regulator spring set (3), and which is
hydraulically operated by the main system pressure.
In hydrostatic drives, it is often required to alter the output flow of
the pump in such a manner that the pre-determined input drive
torque is not exceeded, even with varying working pressures. This
means that, at a constant drive speed, the input power must be
limited.
Design details
LV 06, Series 5
8
1
3
5
6
7
P
St
2
RP
St
P
HD
Symbol
1 stepped spool
2 pilot spring
3 regulating spring set
4 screw
5 threaded cap
6 hollow screw
7 screw
8 shims
Connections
p
HD
operating pressure
p
St
pilot pressure
R return line
The setting of the pilot spring (2) is achieved by means of screw (4)
or by shims (8). The two parts of the regulating spring set (3) are
set completely independent of each other by the threaded cap (5)
and the hollow screw (6). The end stop is set by screw (7).
Series
2
5 = Series 5
Type of connection
O = without subplate
A = with subplate
LV 06 1 A 5
Description
Power limiting valve = LV
Size
Size = 06
Model
1
Threaded connections = 1
O-ring connections = 2
O-ring and threaded connections = 3
Ordering example
LV 06.1.A.5
Power limiting valve
size 6 with threaded connections and subplate, for series 5
1
For model variations see unit dimensions
2
When mounting separately, the LV 06 is independent of
the pump model
Ordering code
HD
P
St
P
R
2
RA 95 546/01.93
Technical data (partly to VDI 3276)
Design: direct operated, seated type pressure relief valve
Mounting:
flange model with O-ring seals or threaded connections
Pipe connections and connection sizes:
see unit dimensions
Weight lbs (kg) Series 5
without subplate 10 (4.5) 5 (2.3)
with subplate 14.3 (6.5) 8.8 (4.0)
Mounting position: optional
Direction of flow: from P
St
to R
Operating pressure range
High pressure side: p
HD
= 0 ... 5800 PSI (0 ... 400 bar)
Pilot pressure side: p
St
= 0 ... 870 PSI (0 ... 60 bar)
Pressure setting range (pilot pressure side)
p
St
= 145 ... 406 or 145 ... 652 PSI (10 ... 28 or 10 ... 45 bar)
(alternative settings on request)
The pressure setting range must be stated in clear text when
ordering.
Fluid temperature range
δ
m min
... δ
m max
= – 4 ... 176 °F (– 20 ... + 80 °C)
Viscosity range
ν
min
...ν
max
= 45 ... 4640 SUS (10 ... 1000 mm
2
/s)
Nominal flow Q
N
= 1.3 GPM (5 L/min)
Pilot pressure curve
Q
N
= 1.3 GPM (5 L/min)
ν = 767 SUS (35 mm
2
/s)
δ = 122 °F (50 °C)
10
0 0.25
(1)
(1) (10)
(2)
(3)
(4)
20
30
40
50
55
(2) (3) (4) (5) (6) (7) (8) (9)
0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25 2.5
Differential pressure ∆p PSI (bar)
Flow Q GPM (L/min)
∆p-Q-curve
Power curves
The power curves follow extensively the power curves laid down
in DIN 42 973, and the rated powers of axial piston units with built
on regulating devices.
For the various power curves available, according to unit see and
size, see pages 3 to 5.
Power overshoot
The variation in regulated value of a power limiting valve is very
small, as the response time is 0.02 sec. When used with con
device S 3041, or the HD control, the actual variation is great as
the minimum setting time of the pump is limited to 0.15 sec. or 0.2
sec. respectively.
For further details of control tolerances, see catalogue sheet
“Control Elements model S”, series E and C.
ν = 767 SUS (35 mm
2
/s)
δ = 122 °F (50 °C)
Co-ordination with control devices
Direct mounting
Direct mounting on the HD control (series 5) (note point 5 in
ordering code).
Note that control type S 3041 is changed when LV 06 is fitted S
3141.
Separate mounting
Power limiting valve LV 06 can be fitted in the pilot circuit of axial
piston units with pressure dependent control devices independent
of the build series, if it is installed separately.
Application example
Port P
St
is connected via a shuttle valve with the pilot circuit of
control device, while port P
HD
is connected via another shuttle
valve into the main circuit of the axial piston pump. If the
operating pressure ex-
ceeds the pre-load of the
regulating spring for the
start of control, the
stepped piston moves
against the spring set and
so reduces the load on
the pilot control spring
and, in turn, the pilot
pressure, so that the
predetermined maximum
drive power at a constant
drive speed is never ex-
ceeded at any operating
point.
Operating curves
100
0
(10)
(50)
20 40 60 80 100
(20)
(30)
(40)
(28)
(45)
200
300
400
500
600
700
Differential pressure ∆p PSI (bar)
Adjustment stroke s (%)
3
RA 95 546/01.93
Power curves, series 5 (for HD control with constant horsepower control)
(360)
0
(300)
(50)
(200) (100)
102030405060708090
(100)
(150)
(200)
(250)
(300)
(350)
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
10
9
8
7
6
5
4
3
2
1
1
Operating pressure p PSI (bar)
Output flow Q GPM (L/min)
10 9
8
7
65
4
3
2
Curve Drive Drive
No. power P torque M
HP (kW) lb-ft (Nm)
1 30 (22) 107 (145)
2 40 (30) 143 (194)
3 50 (37) 178 (242)
4 54 (40) 197 (267)
5 59 (44) 214 (290)
6 74 (55) 268 (363)
7 89 (66) 322 (437)
8 99 (74) 357 (485)
9 118 (88) 430 (582)
10 148 (110) 535 (726)
Size 250
Curve Drive Drive
No. power P torque M
HP (kW) lb-ft (Nm)
1 30 (22) 160 (217)
2 40 (30) 210 (285)
3 50 (37) 267 (362)
4 54 (40) 294 (398)
5 59 (44) 321 (435)
6 74 (55) 400 (543)
7 89 (66) 477 (647)
8 99 (74) 535 (726)
9 118 (88) 637 (863)
10 148 (110) 796 (1079)
11 197 (147) 1071 (1452)
12 215 (160) 1165 (1580)
Size 355
Output flow and drive power are taken for
a standard speed n
N
= 1450 rpm
Output flow and drive power are taken for
a standard speed n
N
= 970 rpm
(345)
0
(50)
(100)
(150)
(200)
(250)
(300)
(350)
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
10
9
8
7
6
5
4
3
2
1
1
11
12
(300) (200) (100)
102030405060708090
Operating pressure p PSI (bar)
Output flow Q GPM (L/min)
10 9
8
76
5
43
2
11
12
4
RA 95 546/01.93
The control device is set to the nominal envelope curve with a variation of ± 5 % of the set value.
Power curves, series 5 (for HD control with constant horsepower control)
Curve Drive Drive
No. power P torque M
HP (kW) lb-ft (Nm)
1 40 (30) 213 (289)
2 50 (37) 267 (362)
3 59 (44) 321 (435)
4 74 (55) 400 (543)
5 99 (74) 534 (724)
6 120 (90) 669 (907)
7 148 (110) 800 (1086)
8 177 (132) 962 (1304)
9 241 (180) 1308 (1774)
Output flow and drive power are taken for a
standard speed n
N
= 970 rpm
(485)
0
(50)
(100)
(150)
(200)
(250)
(300)
(350)
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
9
8
7
6
5
4
3
2
1
1
(100)(200)(300)(400)
102030405060708090100110120
Operating pressure p PSI (bar)
Output flow Q GPM (L/min)
9
8
7
6
5
4
3
2
Size 500
Curve Drive Drive
No. power P torque M
HP (kW) lb-ft (Nm)
1 74 (55) 521 (706)
2 100 (75) 687 (932)
3 120 (90) 861 (1167)
4 148 (110) 1035 (1403)
5 177 (132) 1244 (1687)
6 215 (160) 1519 (2060)
7 252 (188) 1766 (2394)
8 295 (220) 2070 (2806)
9 326 (243) 2279 (3090)
10 389 (290) 2836 (3845)
Output flow and drive power are taken for a
standard speed n
N
= 730 rpm
(730)
0
(50)
(100)
(150)
(200)
(250)
(300)
(350)
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
9
8
7
6
5
4
3
2
1
1
(100)(200)(300)(400)(500)(600)(700)
20406080100120140160180
10
Operating pressure p PSI (bar)
Output flow Q GPM (L/min)
9
87
6
5
4
3
2
10
Size 1000
5
RA 95 546/01.93
0.27 (7)
1.9 (50)
2.9 (75)
0.19 (0.5)
0.47 (12)
Ø 0.334 (8.5)
Ø 3.9 (100)
M14 x 15
0.19 (0.5)
0.47 (12)
Ø 0.25 (6.6)
M14 x 15
2.40 (61)
2.08 (53)
R
HD
P
St
P
St
P
HD
P
R
HD
P
St
0.71 (18)
0.71 (18)
6
1.61 (41)
Ø 0.98 (25)
2.4 (61)
Ø 0.26 (6.6)
Plug M 14 x 1.5
DIN 908
Ø 0.43 (11)
0.25 (6.5)
0.71 (18)
0.06 (1.6)
Ø 0.39 (10)
Ø 0.63 (16)
Ø 0.25 (6.6)
0.67 (17)
2.02 (51.5)
2.44 (62)
1.55 (39.5)
2.61 (66.5)
O-Ring 12 x 2
0.71 (18)
0.23 (6)
0.66 (17) 0.66 (17)
1.49 (38)
Ø 0.98 (25)
0.59 (15)
Ø 0.98 (25)
Ø 0.31 (8)
30 A/F
1.02 (26)
1.02 (26)
7.1 (179.5)
6.9 (175.5)
4.2 (105.5)
0.4 (10)
Ø 1.9 (49)
1.9 (50)
30 A/F
1.55 (39.5)
1.57 (40)
1.57 (40)
0-Ring 12 x 2
0.19 (0.5)
0.06 (1.6)
Ø 0.43 (11)
HD
P
St
P
R
1.18 (30)
1.90 (48.5)
0.47 (12)
0.67 (17)
Ø 0.39 (10)
0.63 (16)
P
R
R
HD
P
st
P
State model required when ordering
Port designation stamped in body.
LV 06, Series 05
Model LV 06.2.A.5
with threaded
subplate
Model LV 06.1.0.5
with threaded
connections
Model LV 06.2.0.5
with O-ring
connections
Model LV 06.3.0.5
with O-ring and
threaded connections
p
HD
= operating pressure
p
St
= pilot pressure
R = return line
6
RA 95 546/01.93
Notes
Mannesmann Rexroth Corporation
Rexroth Hydraulics Div., Industrial,
2315 City Line Road, Bethlehem, PA 18017-2131 Tel. (610) 694-8300 Fax: (610) 694-8467
Rexroth Hydraulics Div., Mobile,
1700 Old Mansfield Road, Wooster, OH 44691-0394 Tel. (330) 263-3400 Fax: (330) 263-3333
All rights reserved – Subject to revision
Printed in U.S.A.
