Bosch Rexroth BVD 52 Series User manual

RE 95528/05.2016, Bosch Rexroth AG
Contents
Type code 2
Technical data 4
Characteristic curves for counterbalance spool 33 5
Functional description 6
Example applications 7
Dimensions 8
BVE installation variants for winch drives 11
Mounting of the counterbalance valve 12
Project planning notes 13
Safety instructions 15
Features
▶ Damping for stable lowering and safe downhill movement
▶ Simple adaptation to application
▶ Compact design and direct mounting to axial piston
motors A6VM and A6VE
▶ Available in a set with axial piston motors A6VM and A6VE
▶ Standard working ports according to SAE J518
▶ Integrated brake release port, with or without pressure
reduction
▶ Good efficiency through reduced flow losses
▶ Four working ports (see type code, pos. 04)
▶ Rotationally symmetric
▶ Suitable for high flow rates
▶ Size 32
▶ Nominal pressure Motor side 450bar
Pump side 350bar
▶ For winches and track drives in open circuit
Counterbalance valve
BVD/BVE Series 52
RE 95528
Edition: 05.2016

Bosch Rexroth AG, RE 95528/05.2016
2BVD/BVE Series 52 | Counterbalance valve
Type code
Valve type
01 Counterbalance valve, double-acting BVD
Counterbalance valve, one-sided BVE
Size
02 Flow, nominal qv nom 650l/min 32
Control range BVD BVE
03 Start/end of opening of counterbalance spool
(spring value without return flow pressure)
20 to 38bar ● ● W
10 to 30bar ● –V
Working port SAE J518 Hole distance
04 1 1/4in 84mm 38
1 1/4in 104mm (bearing 90° offset)1) 31
Ports for brake release
05 With high pressure S
With reduced high pressure 21+4bar (brake release valve) L2)
Series
06 Series 5, index 2 52
Version of port and fastening threads
07 Metric, port threads with profiled sealing ring according to DIN 3852 N
Long spring cover (see page 11)
08 On port side C, lift via port CC
On port side D, lift via port DD
Seal
09 FKM (fluoroelastomer) V
Counterbalance spool
10 Version 33 33
Opening characteristics of counterbalance spool
11 Standard 0
Residual opening in counterbalance spool
12 Without K00
Damping D1 (channel to counterbalance spool)
13 BVE Throttle pin installed on port side CC4599
Throttle pin installed on port side DD4599
BVD Throttle pin, comparative diameter Inlet Outlet
0.4mm 2.0mm D4599
0.4mm 0.7mm D4580
●= Available –= Not available
1) The screws are not included in the scope of delivery. These can be
supplied by Bosch Rexroth on request.
2) On request
Type code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
/ 52 – V 0 1 K00 T03 –

RE 95528/05.2016, Bosch Rexroth AG
Counterbalance valve | BVD/BVE Series 52
Type code
3
Damping D2 (reservoir outlet)
14 Without T00
With orifices on port side Cand Dø0.3mm (D1 max. D45XX) T03
With orifice installed on port side CC03
With orifice installed on port side DD03
Standard / special version
15 Standard version 0
Standard version with installation variant, e.g. ports open or closed, contrary to standard Y
Special version S
●= Available –= Not available
Notice
▶ Note the project planning notes on page 13.
▶ In addition to the type code, please specify the relevant
technical data when placing your order.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
/ 52 – V 0 1 K00 T03 –

Bosch Rexroth AG, RE 95528/05.2016
4BVD/BVE Series 52 | Counterbalance valve
Technical data
Technical data
Hydraulic fluid
The axial piston motor used is decisive for the selection of
hydraulic fluid. For further information, please refer to our
data sheets during project planning.
Note: At no point of the component may the temperature
be higher than 115°C.
Working pressure range
Pressure at working port
C/D (onthe pump side) or
C´/D´ (on the motor side)
Definition
Nominal
pressure
pnom
On the pump side:
350 bar
On the motor side:
450bar
The nominal pressure
corresponds to the maximum
design pressure.
Maximum
pressure
pmax
On the pump side:
400 bar1)
On the motor side:
500bar
Restrictions:
▶ maximum acceleration 7g
▶ maximum 1 million load
changes
Determination of cracking pressure p1(values without
return flow)
The throttle chain from D1and D2is used to damp the
opening and closing speeds of the counterbalance spool.
The actual pump pressure is reduced by the throttle chain
from D1and D2and controls the counterbalance spool.
▼ Circuit diagram BVD
D1
D1
D2
D2
MKC
MKD
Gext
D
C
G´
L´
D´
C´
Port side
(onthe pump
side)
Counterbalance
spool
Motor side
Table of values
Valve type BVD...W BVD...V BVE...W
Nominal pressure pbar On the
pump side
350 350 350
motor side 450 450 450
Flow, nominal qv max l/min 650 650 650
Start of opening of counterbalance spool at port MKΔpK B bar 20 10 20
End of opening of counterbalance spool at port MKΔpK E bar 38 30 38
Pressure reducing valve for
brake release (fixed setting)
Maximum control pressure pbar BVE...L/ 21+4 21+4 21+4
Beginning of control pbar BVE...L/ 10+4 10+4 10+4
Weight approx. mkg 37 37 42
Notice
▶ Theoretical values, without efficiency and tolerances;
values rounded
▶ Exceeding the maximum or falling below the minimum
permissible values can lead to a loss of function,
areduction in operational service life or total
destruction of the valve.
1) With versions “T03”, “C03” and “D03” (concerns damping “D2”,
forreservoir outlet), pressures that are higher than the nominal
pressure are not permitted

RE 95528/05.2016, Bosch Rexroth AG
Counterbalance valve | BVD/BVE Series 52
Characteristic curves for counterbalance spool 33
5
Characteristic curves for counterbalance spool 33
▼ Pressure differential at the outlet (via valve spool) D´ D
orC´ C working port at rear (38)
100 200 300 400 500 600 650
0
12
18
22
20
16
10
2
4
6
8
14
Flow qV[l/min]
Pressure differential ∆p [bar]
▼ Pressure differential at the inlet (via check valve) C C´ or D D´
working port at rear (38)
100 200 300 400 500 600 650
0
12
16
10
2
4
6
8
14
Flow qV[l/min]
Pressure differential ∆p [bar]
The above parameters are based on:
▶ Oil viscosity ν=approx.21mm2/s
▶ Oil temperature ϑ=50°C
▶ Counterbalance spool fully open
Notice
▶ Pressure Δp of approx.20 to 50bar is normal for deter-
mining the maximum flow in winch drives.
▶ If the desired flow (pressure difference) does not
match the counterbalance spool described here,
please contact us.
▼ Pressure differential D´ D or C´ C ( via valve spool )
with working port offset by 90° (31)
100 200 300 400 500 600 650
0
12
18
22
20
16
10
2
4
6
8
14
Flow qV[l/min]
Pressure differential ∆p [bar]
▼ Pressure differential C C´ or D D´ (via check valve),
with working port offset by 90° (31)
100 200 300 400 500 600 650
0
12
16
10
2
4
6
8
14
Flow qV[l/min]
Pressure differential ∆p [bar]

Bosch Rexroth AG, RE 95528/05.2016
6BVD/BVE Series 52 | Counterbalance valve
Functional description
Functional description
Counterbalance valves are designed to reduce the danger of
overspeed and cavitation of axial piston motors in open cir-
cuits. Cavitation occurs if, during braking or load-lowering, the
rotational speed of the motor is greater than it should be for
the given inlet flow, causing the supply pressure to fall
sharply. If the supply pressure drops below the given value
∆pKE, the counterbalance spool will move towards the close
position. The cross-sectional area in the counterbalance valve
return channel is then reduced, creating a bottleneck in the
return flow of the hydraulic fluid. The pressure increases and
brakes the motor until the rotational speed of the motor
reaches the specified value for the given inlet flow.
The counterbalance valve is available in two versions.
BVD: Throttling effect in both flow directions, e.g. for moving
forward and backward
BVE: Throttling effect in one flow direction, e.g. for lowering
with pulling loads
See BVE circuit diagram on page 7
Brake release
Version S
Counterbalance valve with shuttle valve and port Gext
(plugged), without brake release valve (pressure reduction).
The respective high pressure is balanced via the shuttle
valve and is available at port Gext for venting the mechanical
holding brake. The brake vent function without pressure
reduction via the brake release valve is only employed if the
mechanical holding brake is approved for the maximum
working pressure.
▼ Circuit diagram BVD...S
Motor side
D1
D1
D2
D2
MKC
MKD
Gext
D
C
G´
L´
D´
C´
Counterbalance
spool
Port side (on
the pump side)
Version L
Counterbalance valve with shuttle valve, brake release valve
for pressure reduction and portBr (plugged).
The respective high pressure is balanced and fed to the
brake release valve (pressure reducing valve) via the shuttle
valve. This opens from approx. 10bar and reduces the
respective working pressure to approx. 21+4bar. This brake
vent function is employed when the mechanical brake on the
gear unit cannot handle the full system pressure.
The maximum permissible brake release pressure must be
agreed with the winch or track drive manufacturer
.

RE 95528/05.2016, Bosch Rexroth AG
Counterbalance valve | BVD/BVE Series 52
Example applications
7
Example applications
Variable motor with integrated pressure relief valve in the port plate and mounted counterbalance valve.
Counterbalance valve for size 32 winches, without brake release valve (S), with counterbalance spool (pos. 10), without internal
residual opening (K00, mandatory for winches), with weak damping (D4599). E.g.: A6VM215HP5D1P001B/71MWV0S4A29W0-0 +
BVE32W38S/52ND-V330K00C4599D03S00 mounted to a Rexroth winch gearbox
Winch drive application
▶ Circuit diagram example for winch drive in cranes (BVE)
T2
T1
M1
Vg min
Vg max
G
X
U
MKC
Gext
MKC
D
C
D´
C´
G´
L´
D1
D2
S1
MKD
MKD
L´
D1
D2
P
T
A
B
MB
MA
As an alternative to the above example, other Bosch Rexroth axial piston motors (A6VM and A6VE) can also be used.
Track drive application
▶ Circuit diagram example for track drive in excavator crawlers (BVD)
Vg min
Vg max
MBG´
L´
MA
T2
T1
X1X
G
M1
D1
D1
D2
D2
MKC
MKD
Gext
D
C

Bosch Rexroth AG, RE 95528/05.2016
8BVD/BVE Series 52 | Counterbalance valve
Dimensions
Dimensions [mm]
Dimensions
Long spring cover on port side C, lift via port C
66.7
MKC MKD
GEXT
G´
(L)
CD
L´
MKC MKD
GEXT
M14 M14
MKC
31.8
473.4+3 (BVE)
405.6+3
364.6+2(BVD)
250
79
3838
174+3
84
6×ø15 2×ø6.4
o98
154-0.5
101
174+2
158.5-1
158.5+3
130+3
291+2
M61) M61)
X
C´ D´
Gext
Detail X
With shuttle valve
and port Gext (version S)
1) DIN912

RE 95528/05.2016, Bosch Rexroth AG
Counterbalance valve | BVD/BVE Series 52
Dimensions
9
Dimensions [mm]
Long spring cover on port side D, lift via port D
MKC MKD
G´
(L)
CD
L´
MKC MKD
GEXT
MKC
X
C´ D´
o98
154-0.5
101
M61)
158.5-1
158.5+3
M61)
291+2
174+2
130+3
M14 M14
3838
79
174+3
84
GEXT
6×ø15 2×ø6.4
31.8
66.7
473.4+3 (BVE)
405.6+3
364.6+2(BVD)
250
Gext
Detail X
With shuttle valve
and port Gext (version S)
1) DIN912

Bosch Rexroth AG, RE 95528/05.2016
10 BVD/BVE Series 52 | Counterbalance valve
Dimensions
Dimensions [mm]
Ports Standard Size pmax [bar]1) State5)
C, D Working port
Fastening thread
SAE J5182)
DIN13
11/4in
M14×2; 19 deep
400 O
Gext Brake release, high pressure DIN 38523) M14×1.5; 12deep 400 X
C´, D´ Working channel to motor4) ø32 500 O
G´ Balanced high pressure, channel to motor4) ø4.2 400 O
L´ Drain channel to motor4) ø4.2 10 O
VFThreaded plug for filter channel4) DIN 6149 M16×1.5; 13deep 400 X
MKMeasuring pressure in counterbalance spool DIN 38523) M14×1.5; 12deep 400 X
1) Depending on the application, momentary pressure peaks can occur.
Keep this in mind when selecting measuring devices and fittings.
2) Only dimensions according to SAE J518, metric fastening thread
isa deviation from the standard.
3) The countersink can be deeper than as specified in the standard.
4) No customer ports. Subject to technical change
5) O=Must be connected (plugged when delivered)
X=Plugged (in normal operation)