1/8
Pressure relief valve,
pilot operated
Types ZDB and Z2DB
Nominal size 6
Component series 4X
Maximum operating pressure 315 bar
Maximum flow 60 L/min
RE 25751/10.05
Replaces: 05.02
Overview of contents
Contents Page
Features 1
Ordering details 2
Preferred types 2
Symbols 3
Function, section 3
Technical data 4
Characteristic curves 4
Unit dimensions 5 to 7
Features
– Sandwich plate valve
– Connection location to DIN 24340 form A (without locating
pin), (standard)
– Connection location to ISO 4401-03-02-0-94 (with locating
pin), (ordering code .../60)
– 4 pressure stages
– 5 circuit options
– With 1 or 2 pressure valve cartridges
– 4 adjustment elements for pressure adjustment, optional
• Rotary knob
• Sleeve with hexagon and protective cap
• Lockable rotary knob with scale
• Rotary knob with scale
HAD5564
For information regarding the available spare parts see:
www.boschrexroth.com/spc
Inhalt
Overview of contents 1
Features 1
Ordering details 2
Preferred types (readily available) 2
Symbols ( = valve side, = subplate side) 3
Function, section 3
Technical data (for applications outside these parameters, please
consult us!) 4
Characteristic curves (measured with HLP46 and ϑoil = 40 °C ±
5 °C) 4
Unit dimensions: type ZDB 6 VA... (nominal dirmensions in mm)
5
Unit dimensions: type ZDB 6 VB... and type ZDB 6 VP... (no-
mainl dimensions in mm) 6
Unit dimensions: type Z2DB 6 VC... and type Z2DB 6 VD...
(nominal dimensions in mm) 7
Notes 8
2/8 Bosch Rexroth AG Industrial Hydraulics
ZDB 6; Z2DB 6 RE 25751/10.05
Ordering details
Sandwich plate = Z
1 pressure valve cartridge = No code
(only for versions „VA“, „VB“ and „VP“)
2 pressure valve cartridges = 2
(only for versions „VC“ and „VD“)
Pressure relief valve = DB
Nominal size 6 = 6
Relief function from – to:
A – T = VA
P – T = VP
B – T = VB
A – T and B – T = VC
A – B and B – A = VD
Adjustment element for pressure adjustment
Rotary knob = 1
Sleeve with hexagon and protective cap = 2
Lockable rotary knob with scale = 3
1)
Rotary knob with scale = 7
Further details in clear text
No code = Without locating pin
/60
2)
= With locating pin
Seal material
V = FKM seals
(other seals on request)
Attention!
The compatibility of the seals and
pressure fluid is to be taken into account!
Pressure stage
50 = Settable pressure up to 50 bar
100 = Settable pressure up to 100 bar
200 = Settable pressure up to 200 bar
315 = Settable pressure up to 315 bar
4X = Component series 40 to 49
(40 to 49: unchanged installation and connection dimensions)
Z DB 6 4X V
*
1)
H key under Material No. R900008158
is included within the scope of supply
2)
Locating pin ISO 8752-3x8-St, Material No. R900005694
(separate order)
Preferred types (readily available)
Type ZDB Material No.
ZDB 6 VA2-4X/100V R900409889
ZDB 6 VA2-4X/200V R900409886
ZDB 6 VA2-4X/315V R900409893
ZDB 6 VB2-4X/200V R900409854
ZDB 6 VB2-4X/315V R900409896
ZDB 6 VP2-4X/50V R900409847
ZDB 6 VP2-4X/100V R900409933
ZDB 6 VP2-4X/200V R900409844
ZDB 6 VP2-4X/315V R900409898
Further standard components can be
found within the EPS
(Standard Price List).
Type Z2DB Material No.
Z2DB 6 VC2-4X/200V R900411312
Z2DB 6 VC2-4X/315V R900411318
Z2DB 6 VD2-4X/100V R900411317
Z2DB 6 VD2-4X/200V R900411314
Z2DB 6 VD2-4X/315V R900411357
1
2
AP B T
1
2
AP B T
1
2
AP B T
1
2
AP B T
1
2
AP B T
A T P B
A T P B
54 6 8 73 1 2
1
2
Industrial Hydraulics Bosch Rexroth AG
RE 25751/10.05 ZDB 6; Z2DB 6
3/8
Function, section
At rest, the valve is closed. Pressure in port A acts on the spool
(1). At the same time pressure passes through orifice (2) onto
the spring loaded side of spool (1) and via orifice (3) to the
pilot poppet (6). If the pressure in port A rises above the value
set on spring (5), then the pilot poppet (6) opens.
Fluid can now flow from the spring loaded side of the spool (1),
then via orifice (3), and channel (8) into port T. The resulting
pressure drop then moves the spool (1) thereby opening the
connection A to T, while maintaining the pressure set at spring
(5).
Pilot oil return from the two spring chambers is taken externally
via port T.
Pressure valve types ZDB and Z2DB are pilot operated
pressue relief valves and of sandwich plate design.
They are used to limit the pressure within a hydraulic system.
They basically consist of the housing (7), together with one or
two pressue relief valve cartridges.
The system pressure is set by means of adjustment element
(4).
Type ZDB 6 VA2-...
Type ZDB 6 VA... Type ZDB 6 VB...
Type ZDB 6 VP...
Type Z2DB 6 VC...
Type Z2DB 6 VD...
Symbols (
1
= valve side,
2
= subplate side)
350
300
250
200
150
100
50
0
0
10
20
30 40
50
60
1
2
3
4
30
25
20
15
10
5
0
0
10
20
30 40
50
60
4/8 Bosch Rexroth AG Industrial Hydraulics
ZDB 6; Z2DB 6 RE 25751/10.05
Technical data (for applications outside these parameters, please consult us!)
General
Weight Type ZDB 6 kg Approx. 1
Type Z2DB 6 kg Approx. 1,2
Installation Optional
Ambeint temperature range °C –20 to +80
Settable pressure in bar →
Min. settable pressure in bar →
Flow in L/min →
Flow in L/min →
p
E
–q
V
– characteristic curves p
E min
–q
V
– characteristic curves
1
VD (A to B)
2
VA
3
VB, VC
4
VP, VD
The characteristic curves are valid for an outlet pressure = zero over the entire flow range!
Characteristic curves (measured with HLP46 and ϑ
oil
= 40 °C ± 5 °C)
1)
The cleanliness class stated for the components must be
adhered to in hydraulic systems. Effective filtration prevents
faults from occurring and at the same time increases the
components service life.
Hydraulic
Maximum operating pressure bar 315
Maximum settable pressure bar 50; 100; 200; 315
Maximum back pressure (port Y) bar 315 (take the max. tank pressure of the built-on valve/
directional valve into account!)
Maximum flow L/min 60
Pressure fluid Mineral oil (HL, HLP) to DIN 51524; fast bio-degradable
pressure fluids to VDMA 24568 (also see RE 90221); HETG
(rape seed oil); HEPG (polyglycols); HEES (synthetic ester);
other pressure fluids on request
Pressure fluid temperature range °C –20 to +80
Viscosity range mm
2
/s 10 to 800
Max. permissible degree of pressure fluid contamination
Cleanliness class to ISO 4406 (c)
Class 20/18/15
1)
For the selection of filters see data sheets RE 50070,
RE 50076, RE 50081, RE 50086 and RE 50088.
96,5
187
211
3
8
2
91
18
40
63
Ø30
Ø30
16,5
2,5
57
33
4 x Ø5,4
44,5
A
B
T
P
35
Ø32
6 4 5
10
1
2
8
9 3
11
11
0
41
7
12
13
2
F1
F2
F3
F4
G
6,75
0,01/100mm
Rzmax 4
Industrial Hydraulics Bosch Rexroth AG
RE 25751/10.05 ZDB 6; Z2DB 6
5/8
1
Name plate
2
Adjustment type "1"
3
Adjustment type "2"
4
Adjustment type "3"
5
Adjustment type "7"
6
Space required to remove the key
7
Valve sixing screw holes
8
Locknut A/F24, tightening torque M
A
= 10
+5
Nm
9
Hexagon A/F10
10
Identical seal rings for ports A, B, P, T (subplate side)
11
Hexagon 24A/F, tightening torque M
A
= 50 Nm
12
Subplate side – connection location to DIN 24340 form A
(without locating pin), or
ISO 4401-03-02-0-94 (with locating pin Ø3 x 5 mm
deep for locating pin ISO 8752-3x8-St, Material No.
R900005694, separate order)
13
Valve side – connection location to DIN 24340 form A
(without locating pin), or
ISO 4401-03-02-0-94 (with locating pin Ø4 x 4 mm deep)
Unit dimensions: type ZDB 6 VA... (nominal dirmensions in mm)
Valve fixing screws (separate order)
– 4 S.H.C.S. ISO 4762 - M5 - 10.9-flZn-240h-L
Friction co-efficient µ
total
= 0.09 to 0.14;
Tightening torque M
A
= 7.4 Nm ± 10%,
or
– 4 S.H.C.S. ISO 4762 - M5 - 10.9
Friction co-efficient µ
total
= 0.12 to 0.17,
Tightening torque M
A
= 8.1 Nm ± 10%
Required surface finish of the
valve mounting surface
0,01/100mm
Rzmax 4
6/8 Bosch Rexroth AG Industrial Hydraulics
ZDB 6; Z2DB 6 RE 25751/10.05
Unit dimensions: type ZDB 6 VB... and type ZDB 6 VP... (nomainl dimensions in mm)
1
Name plate
2
Adjusment type "1"
3
Adjusment type "2"
4
Adjusment type "3"
5
Adjusment type "7"
6
Space required to remove the key
7
Valve fixing screw holes
8
Locknut 24A/F, tightening torque M
A
= 10
+5
Nm
9
Hexagon 10A/F
10
Identical seal rings for ports A, B, P, T (subplate side)
11
Hexagon 24A/F, tightening torque M
A
= 50 Nm
12
Valve side – connection location to DIN 24340 form A
(without locating pin), or
ISO 4401-03-02-0-94 (with locating pin Ø3 x 5 mm
deep for locating pin ISO 8752-3x8-St, Material No.
R900005694, separate order)
13
Valve side – connection location to DIN 24340 form A
(without locating pin), or
ISO 4401-03-02-0-94 (with locating pin Ø4 x 4 mm deep)
Valve fixing screws (separate order)
– 4 S.H.C.S. ISO 4762 - M5 - 10.9-flZn-240h-L
Friction co-efficient µ
total
= 0.09 to 0.14;
Tightening torque M
A
= 7.4 Nm ± 10%,
or
– 4 S.H.C.S. ISO 4762 - M5 - 10.9
Friction co-efficient µ
total
= 0.12 to 0.17,
Tightening torque M
A
= 8.1 Nm ± 10%
Required surface finish of the
valve mounting surface
114,5 114,5
T
P
20
40
35
113
294
18
239
35
57
24
32,5
4 x Ø5,4
44,5
90,590,5
25
57
227
63
63
18
Ø32
Ø30
Ø30
6 5 5 6
4 1
10 48
2
3
11 11
11 11
12
2 1 0 9 8
3
2 1 0 9 8
3
7
13
A
B
F1
F2
F3
F4
G
6,75
2,5
2
9
8
2,5
0,01/100mm
Rzmax 4
Industrial Hydraulics Bosch Rexroth AG
RE 25751/10.05 ZDB 6; Z2DB 6
7/8
Unit dimensions: type Z2DB 6 VC... and type Z2DB 6 VD... (nominal dimensions in mm)
1
Name plate
2
Adjustment type "1"
3
Adjustment type "2"
4
Adjustment type "3"
5
Adjustment type "7"
6
Space required to remove the key
7
Valve fixing screw holes
8
Locknut 24A/F, tightening torque M
A
= 10
+5
Nm
9
Hexagon 10A/F
10
Identical seal rings for ports A, B, P, T (valve side)
11
Hexagon 24A/F, tightening torque M
A
= 50 Nm
12
Subplate side – connection location to DIN 24340 form A
(without locating pin), or
ISO 4401-03-02-0-94 (with locating pin Ø3 x 5 mm
deep for locating pin ISO 8752-3x8-St, Material No.
R900005694, separate order)
13
Valve side – connection location to DIN 24340 form A
(without locating pin), or
ISO 4401-03-02-0-94 (with locating pin Ø4 x 4 mm deep)
Valve fixing screws (separate order)
– 4 S.H.C.S. ISO 4762 - M5 - 10.9-flZn-240h-L
Friction co-efficient µ
total
= 0.09 to 0.14;
Tightening torque M
A
= 7.4 Nm ± 10%,
or
– 4 S.H.C.S. ISO 4762 - M5 - 10.9
Friction co-efficient µ
total
= 0.12 to 0.17,
Tightening torque M
A
= 8.1 Nm ± 10%
Required surface finish of the
valve mounting surface
Bosch Rexroth AG
Industrial Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Telefon +49 (0) 93 52 / 18-0
Telefax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other informations
set forth in it, are the exclusive property of Bosch Rexroth AG. Without their
consent it may not be reproduced or given to third parties.
The data specified above only serves to describe the product. No statements
concerning a certain condition or suitability for a certain application can be
derived from our information. The details stated do not release you from the
responsibility for carrying out your own assessment and verification. It must
be remembered that our products are subject to a natural process of wear
and ageing.
8/8 Bosch Rexroth AG Industrial Hydraulics
ZDB 6; Z2DB 6 RE 25751/10.05
Notes