Bypass Compensator Cartridge, Size 10
Q
max
= 140l/min,p
max
= 350bar
Direct acting, compensator spring adjustable or fixed, optional spool-locking
Series DWDPB-2D…
1/8
Reference: 400-P-330101-EN-01
Issue: 09.2015
S Compensator spring adjustable: from 7…15 bar
S Compensator spring fixed: 3, 5, 8, 10, 12 or 15 bar
S External remote-control port Z with integral
damping orifice
S High flow rates
S Excellent stability over the whole pressure
and flow range
S Available with hand-knob or tamper-proof cap
S With spoollocking option to allow application with vari
able or fixeddisplacement pumps
S All exposed parts with zinc-nickel plating
S Can be fitted in a line-mounting body
S Can be fitted in sandwich bodies
1 Description
These direct-acting bypass pressure-compensator
(hydrostat) cartridges, series DWDPB-2D…-10…, are size
10, high performance screw-in cartridges with an M24x1.5
mounting thread. The main stage is designed on the slid
ingspool principle. The range includes a model with an ad
justable pressurecompensator spring (7 ... 15 bar) and six
models with a fixed compensator spring (3, 5, 8, 10, 12 or
15 bar). In addition, a model with a lockable spool is avail
able as an option. This enables the valve to be used in
loadsensing systems with either variabledisplacement
pumps (closed center) or fixeddisplacement pumps (open
center). Pressure-compensator cartridges maintain the
control pressure difference between inlet and outlet
pressure - for example, across a throttle (an orifice) - at a
constant level. This means that the flow rate is independent
of the load pressure at the actuator. The adjusting screw or
the hand-knob enable the user to carry out system
optimisation directly on the equipment, without any need to
install or replace components that have different flow
ranges (e.g. proportional valves). To safeguard valve
settings, the adjusting screw can be sealed with a
tamper-proof cap. By fitting external pilot controls
(pressure-relief valves or 2/2 unloading valves) in the line to
the port Z, additional functions such as pressure relief or
vented bypass from A B can be produced. These
screw-in cartridges are used in hydraulic circuits in mobile
and industrial applications, predominantly in conjunction
with a throttle cartridge. All external parts of the cartridge are
zinc-nickel plated to DIN 50979 and are thus suitable for
use in the harshest operating environments. If you intend to
manufacture your own cavities or are designing a line-
mounting installation, please refer to the section “Related
data sheets”.
2 Symbol
A
B
Z
A
B
Z
DWDPB-2D-10-…0715… DWDPB-2D-10-F…
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
2/8
3 Technical data
General characteristics Description, value, unit
Designation bypass pressure-compensator cartridge
Design direct acting, compensator spring adjustable or fixed, optio
nal spool-locking, external remote-control port Z with
integral damping orifice
Mounting method screw-in cartridge M24x1.5
Size nominal size 10, cavity type DD to Bucher Standard
Weight 0.25 kg
Mounting attitude unrestricted
Ambient temperature range -25°C … +80°C
Hydraulic characteristics Description, value, unit
Maximum operating pressure 350bar
Maximum flow rate A B 140 l/min
Maximum flow rate attainable at the actuator See performance graphs
Pressure adjustment range 7…15bar (1 turn 1.2bar)
Flow direction A B, see symbols
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Hydraulic fluid temperature range -25°C … +80°C
Viscosity range 10…650mm
2
/s (cSt), recommended 15...250mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15
4 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt)
Test setup (for flow rate v. load pressure characteristic)
AB
Z
p
L
P0000.ai
1)
2)
3)
4)
1)
Load sensing immediately after orifice
2)
2)
Throttle function (orifice size, see performance graphs)
3)
Bypass pressure-compensator cartridge
4)
Actuator port (p
L
= load pressure)
IMPORTANT!
The load sensing and compensator inlet (port A)
tapping points must be located immediately after
the throttle (orifice) and before it respectively. This
minimises the pressure drop and gives the best
flow rate / load pressure values.
IMPORTANT!
All characteristics were recorded with a surplus
flow of 10…15 l/min.
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
3/8
Q = f (p
L
) Flow rate v. load pressure characteristic
at the minimum compensator setting (7 bar)
P0325.ai
0
20
80
60
100
Q [l/min]
3500
P0325.ai
p
L
[bar]
30025020015010050
40
~ Ø 3.5...4.5~ Ø 3.5...4.5
~ Ø 4.5...5.5~ Ø 4.5...5.5
~ Ø 5.5...6
~ Ø 5.5...6
~ Ø 6...6.5
~ Ø 6...6.5
~ Ø 2.5...3.5~ Ø 2.5...3.5
Q = f (p
L
) Flow rate v. load pressure characteristic
at the maximum compensator setting (15 bar)
P0324.ai
0
20
80
60
40
100
120
140
Q [l/min]
0
p
L
[bar]
300 35025020015010050
~ Ø 3...4~ Ø 3...4
~ Ø 4.5...5.5~ Ø 4.5...5.5
~ Ø 5.5...6.5~ Ø 5.5...6.5
~ Ø 6.5...7.5~ Ø 6.5...7.5
~ Ø 7.5...8.5~ Ø 7.5...8.5
~ Ø 8.5...9.5~ Ø 8.5...9.5
Q = f (p
L
) Flow rate v. load pressure characteristic
at the fixed compensator setting (3 bar)
P0326.ai
0
20
60
80
Q [l/min]
3500
p
L
[bar]
30025020015010050
40
~ Ø 7.5...8.5~ Ø 7.5...8.5
~ Ø 4...5~ Ø 4...5
~ Ø 6...7~ Ø 6...7
Q = f (p
L
) Flow rate v. load pressure characteristic
at the fixed compensator setting (5 bar)
P0327.ai
0
20
80
60
100
Q [l/min]
3500
p
L
[bar]
30025020015010050
40
~ Ø 8...9~ Ø 8...9
~ Ø 6.5...7.5~ Ø 6.5...7.5
~ Ø 5...6~ Ø 5...6
~ Ø 3.5...4.5~ Ø 3.5...4.5
Q = f (p
L
) Flow rate v. load pressure characteristic
at the fixed compensator setting (8 bar)
P0328.ai
0
20
80
60
120
Q [l/min]
3500
p
L
[bar]
30025020015010050
40
100
~ Ø 5.5...6.5
~ Ø 6.5...7.5
~ Ø 4.5...5.5
~ Ø 3...4
~ Ø 7.5...8.5
Q = f (p
L
) Flow rate v. load pressure characteristic
at the fixed compensator setting (10 bar)
P0329.ai
0
20
100
60
120
Q [l/min]
3500
p
L
[bar]
30025020015010050
40
80
~ Ø 7.5...8.5~ Ø 7.5...8.5
~ Ø 6...7~ Ø 6...7
~ Ø 5...6~ Ø 5...6
~ Ø 4...5~ Ø 4...5
~ Ø 3...4~ Ø 3...4
Q = f (p
L
) Flow rate v. load pressure characteristic
at the fixed compensator setting (12 bar)
P0330.ai
0
20
80
60
140
Q [l/min]
3500
p
L
[bar]
30025020015010050
40
100
120
~ Ø 7.5...8.5
~ Ø 6.5...7.5
~ Ø 6...7
~ Ø 5...6
~ Ø 4...5
~ Ø 2.5...3.5
Q = f (p
L
) Flow rate v. load pressure characteristic
at the fixed compensator setting (15 bar)
P0331.ai
0
20
80
60
140
Q [l/min]
3500
p
L
[bar]
30025020015010050
40
120
100
~ Ø 7.5...8.5~ Ø 7.5...8.5
~ Ø 6.5...7.5~ Ø 6.5...7.5
~ Ø 5.5...6.5~ Ø 5.5...6.5
~ Ø 5...6~ Ø 5...6
~ Ø 4...5~ Ø 4...5
~ Ø 2.5...3.5~ Ø 2.5...3.5
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
4/8
p = f (Q) Pressure-drop characteristic (control p, AB)
(port Z completely unloaded)
1)
2)
3)
P0323.ai
0
5
10
15
20
25
Q [l/min]120 140100806040200
p [bar]
1)
15bar control p setting (maximum value)
2)
11bar control p setting (mid-range value)
3)
7bar control p setting (minimum value)
p = f (Q) Pressure-drop characteristic (control p, AB)
(port Z completely unloaded)
9)
7)
6)
8)
5)
4)
P0332.ai
0
5
10
15
20
25
Q [l/min]120 140100806040200
p [bar]
4)
3bar control p fixed
5)
5bar control p fixed
6)
8bar control p fixed
7)
10bar control p fixed
8)
12bar control p fixed
9)
15bar control p fixed
5 Dimensions & sectional view
5.1 Model with adjustable compensator spring
With adjusting screw “S”
94.5...102
47.5 47...54,5
15.5...23
M24x1.5
B
Z
A
S
1
5
17
27
2
1
11)
2
M
A
10)
With hand-knob adjuster “H”
33...40.5
Ø 40
Adjusting screw with tamper-proof cap
(order separately in plain language)
28
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
5/8
5.2 Model with fixed spring
83
47.5 35.4
B
Z
5
27
A
M24x1.5
1
2
2
M
A
10)
Tightening torque M
A
10)
±10%
Cavity type DD
When fitted in steel
When fitted in aluminium
65[Nm]
50[Nm]
47.5
112...119.5
64.5...72
31.5
A
B
Z
27
1
2
M24x1.5
2
M
A
10)
P
S
min.
33...40.5
Ø 40
P
S
max.
5.3 With spool locking (optional)
6 Options
6.1 Spool locking (with handknob)
In a loadsensing system, the optional model featuring
spool locking can be changed over to allow operation with
either a fixeddisplacement pump (open center) or a vari
abledisplacement pump (closed center).
For use with variabledisplacement pumps, the spindle is
screwed in fully. This locks the spool and closes the connec
tion from A to B.
IMPORTANT!
Carry out the changeover only when the valve is
unpressurised.
6.2 Model with steel ring
12)
IMPORTANT!
For installation in aluminium bodies (manifold
blocks), we recommend the model with the steel
ring
12)
.
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
6/8
7 Installation information
IMPORTANT!
When fitting the cartridges, use the specified
tightening torque. Set the required control p
(7…15 bar) with the adjusting screw (s
1
5). After
you have set the valve, lock the adjusting screw
with the lock nut.
ATTENTION!
Only qualified personnel with mechanical skills
may carry out any maintenance work. Generally,
the only work that should ever be undertaken is to
check, and possibly replace, the seals. When
changing seals, oil or grease the new seals tho
roughly before fitting them.
For installation in aluminium bodies (manifold
blocks), we recommend the model with the steel
ring
12)
. (see options in Section 6.2)
IMPORTANT!
Valve settings can be sealed by fitting the
tamper-proof cap. To fit the cap, the snap ring
11)
has to be removed. Subsequent adjustment is
only possible by destroying the tamper-proof cap.
Seal kit NBR no. DS-288-N
9)
Item Qty. Description
1 1 O-ring 22.10/16.50 x 2.50
2 2 O-ring no.020 21.95x 1.78 N90
IMPORTANT!
9)
Seal kit with FKM (Viton) seals, no. DS-288-V
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
7/8
8 Application examples
The following diagram shows a typical manifold block that
uses our direct acting, bypass pressure-compensator
cartridges. Because the port can be pressurised by the
returning oil, priority and series circuits can be constructed.
If the direct acting bypass compensator (BDWD1) does not
receive a load signal from the shuttle valve (WV), it forwards
the oil flow to the next actuator with a pressure drop that, at
its maximum, is equal to the control Δp (7...15 bar) that has
been set or the fixed compensator spring rating that was
chosen. If the 4/3 proportional directional valve (4/3-PW) is
now operated, the inline compensator (IDW) ensures
load-independent travel at a speed that is determined by the
4/3 proportional directional valve. A maximum pressure can
be set with the proportional pressure-relief pilot valve (ePD).
The direct acting bypass compensator (BDWD1) ensures
that the 4/3 proportional directional valve (4/3-PW) is
supplied with the oil flow rate that it requires, regardless of
the other actuators. The surplus flow is made available to
the other actuators. If the ventable proportional throttles
(PD1 and PD2) are not operated, the flow is routed to tank
through the bypass compensators (BDWD2 and BDWD3).
If the proportional throttles (PD1 and/or PD2) are activated,
the hydraulic motors (Motor 1 and/or Motor 2) rotate at
speeds that are independent of their loads. The speed is
determined by the respective proportional throttle. The
direction of rotation of Motor 1 can be reversed by operating
the 4/2 directional valve (4/2-WV). The hydraulic motors
(Motor 1 and Motor 2) work in a series mode in which either
or both can be switched on, and their speeds can be set
individually at any required level and will be independent of
load.
M
s1
P T
s2
ab
AB
5-15 bar
P
BA
a
s4
a
A
0
TPs5
s6
a
A
0
7-15 bar
7-15 bar
7-15 bar
315 bar
Zyl. 1
B1A1
M1
M2 A2 M3B2
A3
PMp
T
L
10-150 bar
s3
B3
Motor 1 Motor 2
EM P
P
P
T
T
BDWD2
DBV
BDWD1
BDWD3
IDW
ePD
PD1
PD2
4/3-PW
WV
4/2−WV
400-P-330101-EN-01/09.2015
Series DWDPB-2D…
8/8
9 Ordering code
DW = compensator
D = direct acting
P = cartridge design
A ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
(blank) = without steel ring (for use in steel body)
S = with steel ring (for use in aluminium body)
2 = pressure function 2 (with external remote-control port Z)
D = cavity type DD
10 = nominal size 10
S (*) = screw adjuster (standard) – adjustable compensator spring
H = hand-knob adjuster – adjustable compensator spring
F = fixed compensator spring
HA = spool locking via handknob;
service with variable or fixeddisplacement pumps
0715 = adjustable compensator spring (control p), steplessly adjustable 7…15 bar
03 = fixed compensator spring (control p), 3 bar
05 = fixed compensator spring (control p), 5 bar
08 = fixed compensator spring (control p), 8 bar
10 = fixed compensator spring (control p), 10 bar
12 = fixed compensator spring (control p), 12 bar
15 = fixed compensator spring (control p), 15 bar
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please contact BUCHER)
1 ... 9 = design stage (omit when ordering new units)
-1
_
Ex.
10 0715-D2 SB --PDDW
_
IMPORTANT!
() When required, the tamper-proof cap (the adjustment seal) must be ordered separately in plain language.
10 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-060121 (i-45.2) Cavity type DD
400-P-740111 (G-24.21) Line- and manifold-mounting body, type DDY-12 (G1/2”)
400-P-335101 (D-30.12) Sandwich presssure-relief valve, size 6, type SDWDPB-2D…
400-P-336101 (D-31.12) Sandwich presssure-relief valve, size 10, type SDWDPB-2D…
E 2015 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
www.bucherhydraulics.cominfo.ch@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.305.320.305.330.355