Proportional Pressure-Relief Cartridge Valve, Size2...4
Q
max
= 24 l/min,p
max
= 300bar
Direct acting, electrically operated
Series DBDSB-1L…
1/8
Reference: 400-P-585301-EN-03
Issue: 05.2020
S Compact construction
for cavity type AL– 3/4-16 UNF
S Operated by a proportional solenoid
S In a power failure, the pressure setting drops to the mini
mum value
S 6 pressure ranges available
S All exposed parts with zinc-nickel plating
S High pressure wet-armature solenoids
S The slip-on coil can be rotated, and it can be
replaced without opening the hydraulic envelope
S Various plug-connector systems and voltages
are available
S With integral manual pressure setting
S Can be fitted in a line-mounting body
1 Description
Series DBDSB-1L… proportional pressure-relief valves are
direct acting screw-in cartridges of sliding-spool design with
a 3/4-16 UNF mounting thread. With these pressure-relief
cartridges, the relief pressure is dependent on the electrical
control signal and can be continuously varied. When the
solenoid is de-energised (initial position), connection 2 → 1
is open and the minimum pressure (free flow) depends on
the flow rate. Any pressure at port 1 is additive to the valve
setting at port 2, therefore port 1 should preferably be con
nected directly to tank. In control mode, the relief pressure
is proportional to the change in the required value (amplifier
output current). In order to obtain precise pressure settings
over the whole of the required pressure range (optimum res
olution), the pressure relief cartridges are available in six
spring ranges. If a proportional solenoid is faulty, for
example, the integral manual pressure setting enables the
required pressure to be set mechanically. Proportional
pressure-relief cartridges are predominantly used in mobile
and industrial applications to allow a pressure in hydraulic
installations to be limited electro-proportionally. All external
parts of the cartridge are zinc-nickel plated to DIN 50979
and are thus suitable for use in the harshest operating envi
ronments. The slip-on coils can be replaced without ope
ning the hydraulic envelope and can be positioned at any
angle through 360°. 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
1
2
3 Technical data
General characteristics Description, value, unit
Designation proportional pressure-relief cartridge
Design direct acting, electrically operated
Mounting method screw-in cartridge 3/4-16UNF
Tightening torque 40 Nm ± 10%
Size nominal size 2...4, cavity type AL
Weight 0.45 kg
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
2/8
Description, value, unitGeneral characteristics
Mounting attitude unrestricted (preferably vertical, coil down)
Ambient temperature range -25°C … +50°C
MTTF
D
values 150 years, see data sheet 400-P-010101-en
Hydraulic characteristics Description, value, unit
Maximum operating pressure - main port 2
- port 1
300bar
250 bar
1)
Maximum flow rate 24l/min
2)
Nominal pressure ranges …18bar, …45bar, …70bar,
…110bar, …160bar, …250bar
3)
Leakage flow rate 2 → 1 … 0.10l/min = pressure range 18 bar / 45bar
… 0.15l/min = pressure range 70bar
… 0.20l/min = pressure range 110bar
… 0.25l/min = pressure range 160bar / 250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 … +70°C
Viscosity range 15…380mm
2
/s (cSt), recommended 20...130mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 18/16/13
ATTENTION!
1)
To prevent any pressure surges, port 1 must be routed to tank with the least possible back-pressure.
Any tank pressure acting at port 1 is additive to the pressure setting at the main port 2.
2)
Depending on the nominal pressure stage.
3) F
or higher pressure to 350 bar can be used DBDTC.
Electrical characteristics Description, value, unit
Supply voltage 12V DC, 24V DC
Control current 12 V = 0…1400 mA, 24 V = 0…700 mA
Power consumption at max. control current max. 19 W
Coil resistance R - cold value at 20°C
- max. warm value
12 V = 5.8Ω/24V = 21Ω
12 V = 8.6Ω/24V = 32Ω
Recommended PWM frequency (dither) 200 Hz
Hysteresis with PWM 2…4 % I
N
Reversal error with PWM 2…4 % I
N
Sensitivity with PWM < 1 % I
N
Reproducibility with PWM < 2 % p
N
Switching time 20 … 60 ms (Solenoid ON)
6 … 20 ms (Solenoid OFF)
These times are strongly influenced by fluid pressure, flow rate and viscosity, as well as by
the dwell time under pressure.
Relative duty cycle 100%
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
3/8
Description, value, unitElectrical characteristics
Protection class to ISO20653 / EN60529 IP 65 / IP 67 / IP 69K, see “Ordering code”
(with appropriate mating connector and
proper fitting and sealing)
Electrical connection DIN EN 175301-803, 3-pin 2 P+E (standard)
for other connectors, see “Ordering code”
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
4/8
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
p = f (I) Pressure adjustment characteristic (Q=1l/min)
P0146.ai
0
80
60
40
20
I [mA]0 100 200 500 700
200 400
300
600
400
800 1000
600
1200 1400
p
2
[bar]
p
N
18 bar
p
N
45bar
p = f (Q) Pressure - Flow rate characteristic p
N
= 18 bar
P0164.ai
0
5
10
15
20
25
Q [l/min]
Einsatzgrenze
Application limit
24812162040
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 70 bar
P0166.ai
0
20
40
60
80
100
Q [l/min]
Einsatzgrenze
Application limit
156 8 10 12 14240
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 160 bar
P0168.ai
0
50
100
150
200
Q [l/min]
Einsatzgrenze
Application limit
968240
p
2
[bar]
p = f (I) Pressure adjustment characteristic (Q=1l/min)
P0147.ai
0
250
150
200
100
50
I [mA]0 100 200 500 700
200 400
300
600
400
800 1000
600
1200 1400
p
2
[bar]
p
N
70 bar
p
N
110bar
p
N
160bar
p
N
250bar
p = f (Q) Pressure - Flow rate characteristic p
N
= 45 bar
P0165.ai
0
10
20
30
40
50
60
Q [l/min]
Einsatzgrenze
Application limit
188121640
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 110 bar
P0167.ai
0
30
60
90
120
150
Q [l/min]
Einsatzgrenze
Application limit
136 8 10 12240
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 250 bar
P0169.ai
0
50
100
150
200
300
Q [l/min]
Einsatzgrenze
Application limit
6451230
p
2
[bar]
250
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
5/8
5 Dimensions & sectional view
4
1
2
5
4
4
3
M
A
= 40 [Nm] ± 10 %
3/4−16 UNF
24
M
A
= 10 [Nm] ± 10 %
M
A
= 2.7 [Nm] ± 10 %
13
1
2
28
135.4
107.4
66.4
54.5
72.5
Ø 36
2
A
B
M
A
= 1 [Nm] ± 10%
Seal kit NBR no. DS-284-N
1)
Item Qty. Description
1 1 O-ring ∅18.00x2.00 FKM
2 1 O-ring no.017 ∅17.17x1.78 N90
3 1 O-ring no.014 ∅12.42x1.78 N90
4 2 O-ring ∅16.00x2.00 FKM
5 1 Backup ring ∅10.70x1.45x1.00 FI0751
IMPORTANT!
1)
Seal kit with FKM (Viton) seals no. DS-284-V
Integral air-bleeding
If necessary, air can be purged from these proportional
pressure-relief cartridges by using the integral air-bleed
screw (Item B). The procedure is as follows:
F Protective cap
G Air-bleed screw
Steps:
Remove the protective cap.
Slacken the air-bleed screw approx. 2 turns.
Switch the pressure-relief cartridge ON/OFF
several times until no more air bubbles escape.
Tighten the air-bleed screw (Ma = 1 Nm ± 10%).
Fit the protective cap.
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
6/8
6 Installation information
IMPORTANT!
To achieve the maximum performance rating, fit
the solenoid coil as shown (with the plug pins at
the bottom) and install the valve in a steel body.
When fitting the cartridges, note the mounting atti
tude (preferably vertical, with coil down → auto
matic air bleed) and use the specified tightening
torque. No adjustments are necessary, since the
cartridges are set in the factory.
ATTENTION!
To prevent any pressure surges, port 1 must be
routed to tank with the least possible back-pres
sure. Any tank pressure acting at port 1 is additive
to the pressure setting at the main port 2.
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.
7 Manual pressure setting
The proportional pressure relief cartridges are equipped
with manual emergency pressure adjustment as standard.
This allows the desired pressure value to be set mechani
cally, e.g. in the event of failure of the electrical control or the
proportional solenoid. The emergency pressure setting is
not intended for adjusting pressure values in solenoid oper
ation and must then be reset to the factrory setting.
IMPORTANT!
Any changes to the manual emergency pressure
setting have a direct effect on the factory settings.
4
C
E
D
13
M
A
= 10 [Nm] ± 10 %
H Protective cap
I Lock nut (13 A/F)
J Adjusting spindle for pressure setting
Setting the pressure manually
Steps:
Remove the protective cap.
Slacken the lock nut (13 A/F).
Screw in (turn to right) the adjusting spindle (4 A/F) until the
required pressure is set.
Tighten the lock nut (13 A/F).
Fit the protective cap.
ATTENTION!
To reset the inverse proportional pressure-relief
cartridges to their initial position (the factory set
ting), a constant flow rate and a pressure gauge
that measures the pressure in the main port 2 are
needed.
Restoring the factory settings
Steps:
Solenoid de-energised.
Remove the protective cap.
Slacken the lock nut (13 A/F).
Unscrew the adjusting spindle (4 A/F) to its end-stop, then
screw it in until the pressure on the gauge just starts to
rise.
Unscrew the spindle again by:
250 bar = 1/4 of a turn
160, 110, 70 bar = 1/2 of a turn
45, 18 bar = 3/4 of a turn
Tighten the lock nut (13 A/F).
Fit the protective cap.
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
7/8
8 Ordering code
D = pressure control valve
B = pressure relief function
D = direct acting
S = standard solenoid (proportional)
B ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
1 = pressure function 1
L = cavity type AL
250 = pressure range …250 bar
1)
160 = pressure range …160 bar
110 = pressure range …110 bar
070 = pressure range … 70 bar
045 = pressure range … 45 bar
018 = pressure range … 18 bar
2 = nominal size 2 for pressure ranges 250and160
3 = nominal size 3 for pressure ranges 110and70
4 = nominal size 4 for pressure ranges 45and18
(blank) = NBR (Nitrile) seals (standard)
V = FKM (Viton) seals
(special seals - please contact BUCHER)
1 ... 9 = design stage (omit when ordering new units)
... = voltage e.g. 24 (24 V)
D = current DC
(blank) = DIN EN 175301-803 connection with mating plug (standard, IP65)
M100 = DIN EN 175301-803 connection without mating plug
C = Kostal plug connection (IP65)
JT = Junior Timer radial plug connection (with protection diode, IP65)
IT = Junior Timer axial plug connection (with protection diode, IP65)
D = Deutsch plug connection 45° DT04-2P (IP67/69K) mating plug not supplied
DT = Deutsch plug connection 45° DT04-2P (with protection diode, IP67/69K)
S = AMP Superseal 1.5 (IP67) / Metri-Pack 150 (IP65) plug connection
F = flying leads (500 mm)
_
L 250
_
-
1 ---BSDB 32D 24 D
1)
for higher pressure to 350 bar can be used the valve DBDTC.
400-P-585301-EN-03/05.2020
Series DBDSB-1L…
8/8
9 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-060171 Cavity type AL
400-P-120110 (W-2.141) Coils for screw-in cartridge valves
400-TI-000041 Coils for screw-in cartridge valves
400-P-510101 Amplifier unit for proportional valves (1-channel) PBS-3A
400-P-585111 Prop. Pressure-Relief Cartridge Valve, Size 2..4, type DBDTC-1L…
400-P-720101 Line-mounting body, type GALA (G3/4”)
400-P-010101 MTTF
D
values for hydraulic valves
E 2020 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: 430.305.300.305.305.310