Linear Motion and
Assembly Technologies ServicePneumaticsHydraulics
Electric Drives
and Controls
Data sheet
Flushing valve with
pressure holding valve SV
RE 95512/05.10 1/8
Replaces: 12.98
Series 10
Nominal pressure 400 bar
Maximum pressure 450 bar
Closed circuit
Features
The flushing valve is used to flush heated hydraulic fluid from –
the closed circuit, and, thus, dirt particles as well.
The integrated pressure holding valve is used to prevent –
drops in the boost pressure.
The flushing valve with pressure holding valve is available –
in two basic versions:
- Line valve for universal use
- Flange valve for reduced piping and installation costs
and effort
Contents
Ordering code for standard program 2
Technical data 3
Functional description 4
Line valve dimensions 5
Flange valve dimensions, size 75 6
Flange valve dimensions, size 90 7
General instructions 8
2/8 Bosch Rexroth AG
Flushing valve with pressure holding valve SV Series 10
RE 95512/05.10
l = Available m = On request – = Not available
Ordering code for standard program
SV / 10 M V –
01 02 03 04 05 06 07 08
09 10 11 12 13
Valve type
01
Flushing valve with pressure holding valve
SV
Mounting variant
02
Flange valve for flange-mounting to the pump, e.g. A10VG Standard
F
Heightened (NG75G only)
H
Line valve
L
Size Flange valve Line valve
03
Mounting variant
F
(standard)
H
(heightened)
Spacing, port A to B 40 mm
– –
l
40
75 mm
(e.g. for A4VG/32 NG28;
A10VG NG28, 45, 63)
l l
– 75
90 mm
l
– – 90
Port versions Flange valve Line valve
04
Mounting variant
F
(standard)
H
(heightened)
Threaded port
l l l
G
SAE flange port
l
– – S
Series
05
Series 1, index 0
10
Version of port thread
06
Metric
M
Seals
07
FKM (fluor-caoutchouc)
V
Orifices Orifice dia. Flange valve Line valve
08
Without
00
Flushing flow q
v
(L/min) with
Dp = p
ND
–
p
G
= 25 bar
and ν = 10 mm
2
/s
p
ND
= low pressure
p
G
= case pressure
ν = viscosity
2.2 L/min 1.0 mm
–
l
10
3.2 L/min 1.2 mm
l l
12
4.3 L/min 1.4 mm
l l
14
5.5 L/min 1.6 mm
l l
16
7 L/min 1.8 mm
l l
18
8.8 L/min 2.0 mm
l l
20
11.5 L/min 2.3 mm
l
– 23
12.5 L/min 2.4 mm
l
– 24
13.7 L/min 2.5 mm
–
l
25
17.2 L/min 2.8 mm
–
l
28
20 L/min 3.0 mm
l
– 30
27 L/min 3.5 mm
–
l
35
35 L/min 4.0 mm
–
l
40
55 L/min 5.0 mm
–
l
50
RE 95512/05.10 Flushing valve with pressure holding valve SV Series 10
Bosch Rexroth AG 3/8
Ordering code for standard program
SV / 10 M V –
01 02 03 04 05 06 07 08 09 10 11 12 13
Flushing side (low-pressure side) Flange valve Line valve
09
A (one sided)
l l
A
B (one sided)
l l
B
A and B (alternating, standard)
l l
C
Switching pressure Flange valve Line valve
10
Differential pressure Dp = 3 to 5 bar (standard)
l l
3
Differential pressure Dp = 8 to 12 bar
–
l
8
Flushing-piston damping
11
Low
D2
Medium
D4
Medium-strong
D6
Strong
D8
Minimum holding pressure
12
16 bar (standard)
H16
20 bar
H20
25 bar
H25
Standard / special version
13
Standard version
0
Special version
S
Note
Short designation X on a feature refers to a special version not covered by the ordering code.
= Available m = On request – = Not available
Technical data
Table of values
Line valve Flange valve Flange valve Flange valve
Distance between axes NG 40
(SVL40G...)
75, standard
(SVF75G/S...)
75, heightened
(SVH75G...)
90, standard
(SVF90G/S...)
Holding pressure bar 16, 20, 25 16, 20, 25 16, 20, 25 16, 20, 25
Switching pressure Dp
of the flushing piston
bar 3 to 5 or
8 to 12
3 to 5 3 to 5 3 to 5
Temperature range °C -40 °C to +115 °C -40 °C to +115 °C -40 °C to +115 °C -40 °C to +115 °C
Installation position arbitrary arbitrary arbitrary arbitrary
Mass kg 1.5 1.9 3.0 2.1
Hydraulic fluid
For the choice of hydraulic fluid, the used axial piston unit is decisive. For further information, please refer to our data sheets
during project planning.
4/8 Bosch Rexroth AG
Flushing valve with pressure holding valve SV Series 10
RE 95512/05.10
The flushing valve is used to flush heated hydraulic fluid from
the closed circuit, and, thus, dirt particles as well.
Via the flushing piston, the respective low-pressure side of the
closed circuit is detected and, at a pressure difference exceeding
approx. 5 bar, flushed out of this line.
During this process, it is necessary that the flushed quantity
and the case drain fluid of the axial piston unit be replaced via
an infeed. The infeed with filtered and cooled hydraulic fluid
decreases the circuit temperature. The flushed quantity is
determined by an orifice in the tank canal. This is dependent on
the orifice size, the pressure difference between low pressure
and tank line as well as the current viscosity.
A pressure holding valve is also installed in the tank canal. As
soon as the pressure level drops below the set holding pressure,
e.g due to an excessive flush quantity, the pressure holding
valve reduces the flush quantity, thereby preventing an imper-
missible pressure drop.
The flushing valve with pressure holding valve is available in
two basic versions:
As a line valve which is connected to the two lines of the –
closed circuit via the piping. Fixing to the device frame is by
means of three through-holes.
The separate arrangement enables universal use.
As a flange valve which is flanged onto the adjacent high- –
pressure ports of the variable pumps A10VG and A4VG
series 32. Fixing is by means of the screws for the SAE
flange port.
This arrangement eliminates the piping and reduces installation
costs and effort.
The tank ports of the flushing valves are directed to the tank via
the cooler.
Characteristic
0
0
A
B
q
V max
p
SP
p
ND
p
SP max
C
Valve ➀
without flushing
Valve ➁
with flushing
Orifice
q
V flushing
q
V valve
q
V boost pump
Flushing valve in middle position, without flushing
Flushing valve switched
Point A: Pressure holding valve ➁ opens (16 bar).
Start of flushing.
Point B: Limiting of flushing quantity by orifice.
Point C: q
V max flushing
(boost pressure valve with adjustment
> 16 bar of variable pump ➀ opens). Flushing flow
increases only according to the pressure-relief valve
characteristic.
q
V flushing
: Flushing flow; flows to the tank via the pressure hold-
ing valve ➁.
q
V valve
: Residual quantity of the boost pump is flushed out
via valve ➀ into the case of the variable pump.
Functional description
Circuit diagram examples
Line valve
Pump MotorFlushing valve with
pressure holding valve
Cooler
B
A
T
1
2
➀ Boost pressure-relief valve in the pump
➁ Pressure holding valve in the flushing valve
Flange valve
Pump MotorFlushing valve with
pressure holding valve
Cooler
B
A
T
1
2
RE 95512/05.10 Flushing valve with pressure holding valve SV Series 10
Bosch Rexroth AG 5/8
Line valve dimensions
40
100
99
124
66
45
70
102
91
8.4
40
60
40
22
A
T
B
1.5
T
11
15; 1 deep
Mounting surface
Ports
Designation Port for Standard Size
1)
Maximum
pressure [bar]
2)
State
A, B Service line DIN 3852 M22 x 1.5; 14 deep 450 O
T Tank DIN 3852 M22 x 1.5; 14 deep 30 O
Observe the general instructions on page 8 for the maximum tightening torques.
1)
Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings.2)
O = Must be connected (plugged on delivery)
6/8 Bosch Rexroth AG
Flushing valve with pressure holding valve SV Series 10
RE 95512/05.10
Flange valve dimensions, size 75
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
Port version G Port version S
Sectional
148
23
23.8
50.8
75
A
B
T
A A
B B
ø42
1
16
14
ø18
ø10.5
47.5
5
39
117
77.5
66
29
123
T
T
67.5
25
59
Sectional
Mounting variant F
Mounting variant H
77.5
117
23
23.8
66
29
123
148
50.8
75
5
47.5
35
T
T
A
B
ø10.5
ø19
Ports
Designation Port for Port
version
Standard Size
1)
Maximum
pressure [bar]
2)
State
A, B Service line (high-pressure series) G DIN 3852 M27 x 2; 16 deep 450 O
A, B Service line (high-pressure series) S SAE J518 3/4 in 450 O
T Tank
DIN 3852
3)
M16 x 1.5; 12 deep 30 O
Observe the general instructions on page 8 for the maximum tightening torques.
1)
Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings.2)
The spot face can be deeper than specified in the appropriate standard.3)
O = Must be connected (plugged on delivery)
Sectional A-A Sectional B-B
RE 95512/05.10 Flushing valve with pressure holding valve SV Series 10
Bosch Rexroth AG 7/8
Flange valve dimensions, size 90
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
Port version G Port version S
Sectional Sectional
ø49
ø20
1
19
14
27
27.8
57.2
A
B
A A
B B
90
171.5
1
47.5
42
T
ø13
29
133
81.5
121
66
T
ø13
ø25
29
133
81.5
121
1
27.8
57.2
90
171.5
66
40
T
T
B
A
27
47.5
Ports
Designation Port for Port
version
Standard Size
1)
Maximum
pressure [bar]
2)
State
A, B Service line (high-pressure series) G DIN 3852 M33 x 2; 19 deep 450 O
A, B Service line (high-pressure series) S SAE J518 1 in 450 O
T Tank
DIN 3852
3)
M16 x 1.5; 12 deep 30 O
Observe the general instructions on page 8 for the maximum tightening torques.
1)
Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings.2)
The spot face can be deeper than specified in the appropriate standard.3)
O = Must be connected (plugged on delivery)
Sectional A-A Sectional B-B
8/8 Bosch Rexroth AG
Flushing valve with pressure holding valve SV Series 10
RE 95512/05.10
© This document, as well as the data, specifications and other information set
forth in it, are the exclusive property of Bosch Rexroth AG. It may not be repro-
duced or given to third parties without its consent.
The data specified above only serve to describe the product. No statements
concerning a certain condition or suitability for a certain application can be de-
rived from our information. The information given does not release the user from
the obligation of own judgment and verification. It must be remembered that our
products are subject to a natural process of wear and aging.
Subject to change.
Bosch Rexroth AG
Hydraulics
Axial piston units
Glockeraustraße 2
89275 Elchingen, Germany
Phone +49 73 08 82-0
Fax +49 73 08 72 74
info.brm-ak@boschrexroth.de
www.boschrexroth.com/axial-piston-pumps
General instructions
The SV flushing valve with pressure holding valve – is designed to be used in closed circuits.
Project planning, assembly and commissioning of – components for the axial piston unit require the involvement of qualified per-
sonnel.
The service line ports and function ports are only designed to accommodate hydraulic lines. –
During and shortly after operation, there is a risk of burns on the flushing valve. Take appropriate safety measures (e. g. by wearing –
protective clothing).
Depending on the operational state of the axial piston unit or flushing valve (operating pressure, fluid temperature), the charac- –
teristic may shift.
Pressure ports: –
The ports and fixing threads are designed for the specified maximum pressure. The machine or system manufacturer must
ensure that the connecting elements and lines correspond to the specified operating conditions (pressure, flow, hydraulic fluid,
temperature) with the necessary safety factors.
The data and notes contained herein must be adhered to. –
The product is not approved as a component for the safety concept of a general machine according to DIN EN ISO 13849. –
The following tightening torques apply: –
Fittings: -
Observe the manufacturer's instruction regarding the tightening torques of the used fittings.
Threaded hole of the - flushing valve:
The maximum permissible tightening torques M
G max
are maximum values of the threaded holes and must not be exceeded.
For values, see the following table.
Ports
Maximum permissible
tightening torque of the
threaded holes M
G max
Required tightening
torque of the locking
screws M
V
WAF
hexagon socket of the
locking screws
Standard Threaded size
DIN 3852 M16 x 1.5 100 Nm 50 Nm 8 mm
M22 x 1.5 210 Nm 80 Nm 10 mm
M27 x 2 330 Nm 135 Nm 12 mm
M33 x 2 540 Nm 225 Nm 17 mm
