Inverse Proportional Pressure-Relief Cartridge, Size 5
Q
max
= 60 l/min,p
max
= 300bar
Seated pilot,spool-type main stage
Series DBVSA-1LG…
1/6
Reference: 400-P-586101-EN-03
Issue: 05.2020
S Compact construction
for cavity type AL– 3/4-16 UNF
S Excellent stability over the whole pressure
and flow range
S Nominal pressure when solenoid de-energised
(fail-safe function)
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 DBVSA-1LG… inverse-proportional pressure-relief
valves are size 5, two stage screw-in cartridges with a
3/4-16 UNF mounting thread. They consist of a spool-type
main stage and a leak-free, poppet-type pilot stage with a
falling pressure/current characteristic. Thanks to the dam
ping of the solenoid armature, these pressure-relief cartrid
ges exhibit excellent stability over the whole pressure and
flow range. With these proportional pressure-relief cartrid
ges, the relief pressure is dependent on the electrical con
trol current and can be continuously varied. When the sole
noid is de-energised (initial position), the relief pressure is
the nominal pressure of the applicable spring range (fail-
safe function). 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 inversely proportional to the change in the required value
(amplifier output current). In order to obtain precise pres
sure settings over the whole of the required pressure range
(optimum resolution), the pressure relief cartridges are avai
lable 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. These propor
tional pressure-relief cartridges with damping are predomi
nantly used in mobile and industrial applications to allow a
pressure in a motor bypass line to be limited electro-propor
tionally. The cartridges are distinguished by outstanding
stability in oscillation-susceptible systems such as fan-drive
control circuits. 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. The slip-on coils can
be replaced without opening 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 inverse proportional pressure-relief cartridge
Design seated pilot,spool-type main stage,damped design
Mounting method screw-in cartridge 3/4-16UNF
400-P-586101-EN-03/05.2020
Series DBVSA-1LG…
2/6
Description, value, unitGeneral characteristics
Tightening torque 40 Nm ± 10%
Size nominal size 5, cavity type AL
Weight 0.40 kg
Mounting attitude unrestricted (preferably vertical, coil down)
Ambient temperature range -25°C … +50°C
Hydraulic characteristics Description, value, unit
Maximum operating pressure (p
max
) - main port 2
- port 1
300bar
250 bar
1)
Maximum flow rate 60l/min
Nominal pressure ranges (p
N
) …50bar, …63bar, …100bar,
…160bar, …230bar, …300bar
Leakage flow rate 2 → 1 … 0.10l/min = pressure range 50 bar / 63bar
… 0.15l/min = pressure range 100bar
… 0.25l/min = pressure range 160bar
… 0.36l/min = pressure range 230bar
… 0.45l/min = pressure range 300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…1400 mA, 24 V = 0…760 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
Relative duty cycle 100%
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-586101-EN-03/05.2020
Series DBVSA-1LG…
3/6
4 Performance graphs measured with oil viscosity 33mm
2
/s (cSt)
p = f (I) Pressure adjustment characteristic (Q=5l/min)
P0173.ai
0
80
60
100
40
20
I [mA]0 200
400
400
800
500
1000
600
1200
700
1400
100
200
300
600
p
2
[bar]
p
N
63 barp
N
63 bar
p
N
100 barp
N
100 bar
p
N
50 barp
N
50 bar
p = f (Q) Pressure - Flow rate characteristic p
N
= 50 bar
P0175.ai
0
10
20
30
40
50
60
Q [l/min]6020 30 40 50100
p
2
[bar]
Einsatzgrenze
Application limit
(p min. / I = max. mA)
p = f (Q) Pressure - Flow rate characteristic p
N
= 100 bar
P0177.ai
0
20
40
60
80
120
100
140
Q [l/min]6020 30 40 50100
p
2
[bar]
Einsatzgrenze
Application limit
(p min. / I = max. mA)
p = f (Q) Pressure - Flow rate characteristic p
N
= 230 bar
P0179.ai
0
40
80
120
160
200
240
280
Q [l/min]6020 30 40 50100
p
2
[bar]
Einsatzgrenze
Application limit
(p min. / I = max. mA)
p = f (I) Pressure adjustment characteristic (Q=5l/min)
P0174.ai
0
200
250
150
300
100
50
I [mA]0 200
400
400
800
500
1000
600
1200
700
1400
100
200
300
600
p
2
[bar]
p
N
300 barp
N
300 bar
p
N
230 barp
N
230 bar
p
N
160 barp
N
160 bar
p = f (Q) Pressure - Flow rate characteristic p
N
= 63 bar
P0176.ai
0
20
40
60
80
Q [l/min]6020 30 40 50100
p
2
[bar]
Einsatzgrenze
Application limit
(p min. / I = max. mA)
p = f (Q) Pressure - Flow rate characteristic p
N
= 160 bar
P0178.ai
0
40
80
120
160
200
Q [l/min]6020 30 40 50100
p
2
[bar]
Einsatzgrenze
Application limit
(p min. / I = max. mA)
p = f (Q) Pressure - Flow rate characteristic p
N
= 300 bar
P0180.ai
0
50
100
150
200
250
300
Q [l/min]6020 30 40 50100
p
2
[bar]
Einsatzgrenze
Application limit
(p min. / I = max. mA)
400-P-586101-EN-03/05.2020
Series DBVSA-1LG…
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5 Dimensions & sectional view, Application examples
Reversible fan-drive system
M
A
= 40 [Nm] ±10%
24
M
A
= 2.7 [Nm] ±10%
30.5
107.4
137.9
78.4
3
1
4
2
M
A
= 10 [Nm] ±10%
4
3/4−16UNF
54.5
72.5
2
1
Ø 36
3
13
M
V1
WK42 A ...
12
41
32
2
A
B
M
A
= 1 [Nm] ±10%
Seal kit NBR no. DS-284-N
1)
Item Qty. Description
1 1 O-ring no.017 ∅17.17x1.78 N90
2 1 O-ring no.014 ∅12.42x1.78 N90
3 2 O-ring ∅16.00x2.00 FKM
4 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:
A Protective cap
B Air-bleed screw
Steps:
1. Remove the protective cap.
2. Slacken the air-bleed screw approx. 2 turns.
3. Switch the pressure-relief cartridge ON/OFF
several times until no more air bubbles escape.
4. Tighten the air-bleed screw (Ma = 1 Nm ± 10%).
5. Fit the protective cap.
400-P-586101-EN-03/05.2020
Series DBVSA-1LG…
5/6
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
These inverse proportional pressure-relief cartridges are
equipped as standard with an integral manual pressure set
ting. If a proportional solenoid is faulty, for example, this ma
nual pressure setting enables the required pressure to be
set mechanically. The manual pressure setting can also be
used to make minor pressure adjustments directly at the sy
stem.
IMPORTANT!
Any changes to the manual pressure setting have
a direct effect on the factory settings.
4
C
E
D
13
M
A
= 10 [Nm] ± 10 %
C Protective cap
D Lock nut (13 A/F)
E Adjusting spindle for pressure setting
Setting the pressure manually
Steps:
1. Remove the protective cap.
2. Slacken the lock nut (13 A/F).
3. Unscrew (turn to left) 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 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. The pressure setting must not exceed
the nominal pressure of the spring range in use.
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 reaches
the nominal pressure (pN) of the spring range in use.
5. Tighten the lock nut (13 A/F).
6. Fit the protective cap.
400-P-586101-EN-03/05.2020
Series DBVSA-1LG…
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8 Ordering code
-
D = pressure control valve
B = pressure relief function
V = two stage
S = standard solenoid (proportional)
A ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
1 = pressure function 1
L = cavity type AL
G = proportional solenoid, inverse type (pulling)
300 = pressure range …300 bar
230 = pressure range …230 bar
160 = pressure range …160 bar
100 = pressure range …100 bar
063 = pressure range … 63 bar
050 = pressure range … 50 bar
5 = nominal size 5
(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 300
_
-
1 --ASV 3D GB 5 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-120110 (W-2.141) Coils for screw-in cartridge valves
400-P-510101 Amplifier unit for proportional valves (1-channel) PBS-3A
400-P-720101 Line-mounting body, type GALA (G3/8”)
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: 430.305.300.305.310.310