Inline Compensator Cartridge, Size 16
Q
max
= 250l/min,p
max
= 420bar
Direct acting,adjustable compensator spring
Series DWDPA-5B…
1/6
Reference: 400-P-330801-EN-02
Issue: 02.2022
S Compensator spring adjustable from 8…16 bar
S External remote-control port 3 with integral
damping orifice
S High flow rates
S Very good dynamics
S Excellent stability over the whole pressure
and flow range
S Available with hand-knob or tamper-proof cap
S All exposed parts with zinc-nickel plating
S Can be fitted in a line-mounting body
1 Description
These direct-acting inline pressure-compensator (hydro
stat) cartridges, series DWDPA-5B…-16…, are size 16,
high performance screw-in cartridges with an M42x2 moun
ting thread. The main stage is designed on the sliding-spool
principle, and it can be set between 8…16 bar using the ad
justable compensator spring. Inline compensators 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 handwheel enable the user to carry out system optimi
sation 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 adju
sting spindle can be sealed with a tamper-proof cap. These
screw-in cartridges are used in hydraulic circuits, predomi
nantly in conjunction with a throttle cartridge, to ensure con
stant travel speed irrespective of variations in load or pri
mary pressure. All external parts of the cartridge are zinc-
nickel plated according to DIN EN ISO 19 598 and are thus
suitable for use in the harshest operating environments. For
self-assembly, please refer to the section related data
sheets.
2 Symbol
1
3
3 Technical data
General characteristics Description, value, unit
Designation inline pressure-compensator cartridge
Design direct acting, adjustable compensator spring, external
remote-control port 3 with integral damping orifice
Mounting method screw-in cartridge M42x2
Tightening torque 200Nm ± 10%
Size nominal size 16, cavity type EB
Weight 0.92 kg
Mounting attitude unrestricted
Ambient temperature range -25°C … +80°C
400-P-330801-EN-02/02.2022
Series DWDPA-5B…
2/6
Hydraulic characteristics Description, value, unit
Maximum operating pressure 420bar
Maximum allowable pressure in port 3 420bar
Maximum flow rate 2 → 1 250l/min
Maximum flow rate attainable at the actuator 130 l/min with control Δp of 8 bar
225 l/min with control Δp of 16 bar
Pressure adjustment range 8…16bar (1 turn ≅ 1.5bar)
Flow direction 2 → 1, 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
400-P-330801-EN-02/02.2022
Series DWDPA-5B…
3/6
4 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt) and in a cavity with an annular groove
Test setup (for flow rate v. load pressure characteristic)
p
L
P0000.ai
1)
2)
4)
3)
2
1
1)
Load sensing immediately after orifice
2)
2)
Throttle function (orifice size, see performance graphs)
3)
Inline pressure-compensator cartridge
4)
Actuator port (p
L
= load pressure)
IMPORTANT!
The load-sensing tapping point must be located
immediately after the throttle (orifice). Also bear in
mind that the pressure drop between the compen
sator inlet (2) and the throttle outlet (orifice
2
) must
be as small as possible (short distance between
the two components). This gives the best flow rate
/ load pressure values.
Q = f (Δp) Flow rate - Pressure drop characteristic
at the minimum compensator setting (8 bar)
P0035.ai
0
25
100
75
50
125
150
Q [l/min]
4003002001000
~ Ø 8.5...9.5 mm
~ Ø 7.5...8.5
~ Ø 5...6
~ Ø 3.5...4.5
Q = f (Δp) Flow rate - Pressure drop characteristic
at the mid-range compensator setting (12 bar)
P0036.ai
0
100
50
150
200
Q [l/min]
4003002001000
~ Ø9.5...10.5 mm
~ Ø 8.5...9.5
~ Ø 6.5...7.5
~ Ø 4.5...5.5
Q = f (Δp) Flow rate - Pressure drop characteristic
at the maximum compensator setting (16 bar)
P0037.ai
0
50
200
150
100
250
Q [l/min]
4003002001000
~ Ø10...11 mm
~ Ø 7.5...8.5
~ Ø 6...7
~ Ø 4...5
~ Ø 9...10
Δp = f (Q) Pressure-drop characteristic (control Δp, 2→1)
(port 3 completely unloaded)
P0034.ai
0
5
10
15
20
Q [l/min]250200150100500
p [bar]
400-P-330801-EN-02/02.2022
Series DWDPA-5B…
4/6
5 Dimensions & sectional view
With adjusting screw “S”
73 26.5
23.8 ... 30.4
123 ... 130
(8 ... 16 bar)
s
1
5
5)
46
Ma = 200
± 10 [Nm]
16
Ø 49
1
2
3
4
5
M42 x 2
2
3
1
With hand-knob adjuster “H”
41.1 ... 47.8
Adjusting screw with tamper-proof cap
(order separately in plain language)
36.2
6 Installation information
IMPORTANT!
When fitting the cartridges, use the specified
tightening torque. Set the required control Δp
(8…16 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.
IMPORTANT!
Valve settings can be sealed by fitting the tamper-
proof cap. To fit the cap, the snap ring
5)
has to be
removed. Subsequent adjustment is only possi
ble by destroying the tamper-proof cap.
Seal kit NBR no. DS-359-N
6)
Item Qty. Description
1 1 O-ring no.129 ∅39,34x 2,62 N90
2 1 O-ring no.125 ∅32,99x 2,62 N90
3 1 O-ring no. 124 ∅31,42x 2,62 N90
4 2 Backup ring ∅32,00x2,00x1,40 FI0751
5 2 Backup ring ∅30,00x2,00x1,40 FI0751
IMPORTANT!
6)
Seal kit with FKM (Viton) seals, no. DS-359-V
400-P-330801-EN-02/02.2022
Series DWDPA-5B…
5/6
7 Application examples
The following diagram shows a typical manifold block for a
load-sensing circuit with a pressure/flow-controlled pump.
The block uses our direct acting, inline pressure-compen
sator cartridges.
In this application all three actuators have to travel together,
and it is therefore necessary to provide an inline compen
sator for each station.
The direction and speed of cylinder 1 is determined by the
4/3 proportional directional valve (4/3-PW), which has me
ter-in and meter-out throttling.
The inline compensator (IDW1) ensures that there a
constant pressure drop across the proportional directional
valve. Since the cylinder is also braked by this proportional
directional valve (4/3-PW), the load signal is fed back
through a 3/2 solenoid valve (StV) that connects with the re
spective cylinder supply line in each situation.
The speed of cylinder 2 (Zyl. 2) is independent of the load,
and it is determined by the ventable proportional throttle
(PD1) and the inline compensator (IDW2).
By placing a proportional pressure-relief valve (ePD) in the
remote-control line for the compensator, we create a pro
portional 2-way pressure-reducing function. The direction
of travel is determined by a 4/2 solenoid valve (4/2-WV) and
the deceleration is controlled by the two counterbalance
valves.
In the case of cylinder 3 (Zyl. 3), the ventable proportional
throttle (PD2) and inline compensator (IDW3) ensure that its
travel speed is also load-compensated. The electrically
operated pressure-relief valve (DV1) enables two different
adjustable pressure levels to be set and activated. The two
3/2 directional valves (3/2-WV1 / 3/2-WV2) control the direc
tion of travel (and fast-advance, slow speed). The coun
terbalance valve, which is unaffected by back pressure,
prevents the cylinder from overrunning.
400-P-330801-EN-02/02.2022
Series DWDPA-5B…
6/6
8 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
5 = pressure function 5 (with external remote-control port 3)
B = cavity type EB
16 = nominal size 16
S = screw adjuster (standard)
H = hand-knob adjuster
0816 = adjustable compensator spring (control Δp), steplessly adjustable 8…16 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.
16 0816-B5 SA --PDDW
IMPORTANT!
When required, the tamper-proof cap (the adjustment seal) must be ordered separately in plain language.
9 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-080111 (i-55.2) Cavity type EB to ISO 7789-42-06-0-07
400-P-750115 (G-29.22) Line-mounting body, type GEBAA (G1”)
E 2022 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