Proportional Pressure-Relief Cartridge Valve, Size2...4
Q
max
= 24 l/min,p
max
= 350bar
Direct acting, electrically operated
Series DBDRB-1L…
1/6
Reference: 400-P-585101-EN-03
Issue: 03.2017
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, without solenoid coil,
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 With integral manual pressure setting
S Can be fitted in a line-mounting body
1 Description
Series DBDRB-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 re
solution), 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 –
solenoid coil are zinc plated, and are thus suitable for use
in the harshest operating environments. The slip-on coils
can be replaced without opening the hydraulic envelope
and can be positioned at any angle through 360°. If you in
tend to manufacture your own cavities or are designing a
line-mounting installation, please refer to the section “Rela
ted 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 0.50 kg
400-P-585101-EN-03/03.2017
Series DBDRB-1L…
2/6
Description, value, unitGeneral characteristics
Mounting attitude unrestricted (preferably vertical, coil down)
Ambient temperature range -25°C … +50°C
Hydraulic characteristics Description, value, unit
Maximum operating pressure - main port 2
- port 1
350bar
250 bar
1)
Maximum flow rate 24l/min
Nominal pressure ranges …25bar, …63bar, …100bar,
…160bar, …230bar, …350bar
Leakage flow rate 2 1 … 0.10l/min = pressure range 25 bar / 63bar
… 0.20l/min = pressure range 100 bar
… 0.25l/min = pressure range 160bar
… 0.30l/min = pressure range 230bar
… 0.40l/min = pressure range 350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.
Electrical characteristics Description, value, unit
Supply voltage 12V DC, 24V DC
Control current 12 V = 0…1600 mA, 24 V = 0…800 mA
Power consumption at max. control current max. 19.5 W
Coil resistance R - cold value at 20°C
- max. warm value
12 V = 4.8/24V = 17.7
12 V = 7.5/24V = 30
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%
Protection class to ISO20653 / EN60529 IP65
Electrical connection 3-pin square plug to ISO 4400 / DIN 43 650 (standard)
for other connectors, see “Ordering code”
400-P-585101-EN-03/03.2017
Series DBDRB-1L…
3/6
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
p = f (I) Pressure adjustment characteristic (Q=1l/min)
P0126.ai
0
100
80
60
40
20
I [mA]0 200 400 500 600 700 800
I [mA]
100
200 400
300
600 800 1000 1200 1400 1600
p
2
[bar]
p
N
25 bar
p
N
63 bar
p = f (Q) Pressure - Flow rate characteristic p
N
= 25 bar
P0128.ai
0
10
20
30
40
Q [l/min]
Einsatzgrenze
Application limit
242012 16840
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 100 bar
P0130.ai
0
20
40
60
80
100
120
Q [l/min]
Einsatzgrenze
Application limit
156 8 10 12 14420
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 230 bar
P0133.ai
0
50
100
150
200
250
Q [l/min]
Einsatzgrenze
Application limit
9234567810
p
2
[bar]
p = f (I) Pressure adjustment characteristic (Q=1l/min)
P0127.ai
0
350
200
250
300
150
100
50
I [mA]0 200 400 500 600 700 800
I [mA]
100
200 400
300
600 800 1000 1200 1400 1600
p
2
[bar]
p
N
100 bar
p
N
160 bar
p
N
230 bar
p
N
350 bar
p = f (Q) Pressure - Flow rate characteristic p
N
= 63 bar
P0129.ai
0
10
20
30
40
50
60
70
Q [l/min]
Einsatzgrenze
Application limit
1812 16840
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 160 bar
P0131.ai
0
30
60
90
120
150
180
Q [l/min]
Einsatzgrenze
Application limit
136 8 10 12420
p
2
[bar]
p = f (Q) Pressure - Flow rate characteristic p
N
= 350 bar
P0132.ai
0
50
100
150
200
250
300
350
Q [l/min]
Einsatzgrenze
Application limit
6234510
p
2
[bar]
400-P-585101-EN-03/03.2017
Series DBDRB-1L…
4/6
5 Dimensions & sectional view
4
1
2
5
3
2
1
4
13
MA = 10 [Nm] 10 %
M
A
= 2.7 [Nm] 10 %
M
A
= 40 [Nm] 10 %
60.3
77.8
35
24
3/4−16 UNF
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 1 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:
7. Remove the protective cap.
8. Slacken the air-bleed screw approx. 2 turns.
9. Switch the pressure-relief cartridge ON/OFF several
times until no more air bubbles escape.
10. Tighten the air-bleed screw (Ma = 1 Nm 10%).
11. Fit the protective cap.
400-P-585101-EN-03/03.2017
Series DBDRB-1L…
5/6
6 Installation information
IMPORTANT!
To achieve the proportional pressure-relief car
tridge's maximum performance rating, fit the sole
noid coil as shown (with the plug pins at the bot
tom). When fitting the cartridges, note the moun
ting attitude (preferably vertical, with coil down
automatic air bleed) and use the specified tighte
ning 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
These proportional pressure-relief cartridges are equipped
as standard with an integral manual pressure setting. If a
proportional solenoid is faulty, for example, this manual
pressure setting enables the required pressure to be set
mechanically. This manual pressure setting is not designed
for adjusting the pressure in a dynamic control mode.
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:
1. Remove the protective cap.
2. Slacken the lock nut (13 A/F).
3. Screw in (turn to right) the adjusting spindle (4 A/F) until
the required pressure is set.
4. Tighten the lock nut (13 A/F).
5. Fit the protective cap.
ATTENTION!
To reset the proportional pressure-relief cartrid
ges to their initial position (the factory setting), a
constant flow rate (e.g. 1 l/min) and a pressure
gauge that measures the pressure in the main
port 2 are needed. The procedure is as follows:
Restoring the factory settings
Steps:
1. Solenoid de-energised.
2. Remove the protective cap.
3. Slacken the lock nut (13 A/F).
4. 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.
5. Unscrew the spindle again by:
350 bar = 1/4 of a turn
230, 160, 100 bar = 1/2 of a turn
63, 25 bar = 3/4 of a turn
6. Tighten the lock nut (13 A/F).
7. Fit the protective cap.
400-P-585101-EN-03/03.2017
Series DBDRB-1L…
6/6
8 Ordering code
D = pressure control valve
B = pressure relief function
D = direct acting
R = proportional solenoid
A ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
1 = pressure function 1
L = cavity type AL
350 = pressure range …350 bar
230 = pressure range …230 bar
160 = pressure range …160 bar
100 = pressure range …100 bar
063 = pressure range … 63 bar
025 = pressure range … 25 bar
2 = nominal size 2 for pressure ranges 350and230
3 = nominal size 3 for pressure ranges 160and100
4 = nominal size 4 for pressure ranges 063and025
(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) = ISO 4400 / DIN 43 650 connection with mating plug (standard, IP65)
M100 = ISO 4400 / DIN 43 650 connection without mating plug
for the following plug-variants, please consult Bucher:
J = Junior Timer radial plug connection (IP 65) mating plug not supplied
_
L 350
_
-
1 ---BRDB 32D 24 D
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-510101 Amplifier unit for proportional valves (1-channel) PBS-3A
400-P-511101 (P-3) Amplifier card, 1-channel for valves with one solenoid, type SAN-535…
400-P-720101 Line-mounting body, type GALA (G3/4”)
E 2017 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