ZDRK 6 VP 1/4 RE 26 572/11.02
© 2002
by Bosch Rexroth AG, Industrial Hydraulics, D-97813 Lohr am Main
All rights reserved. No part of this document may be reproduced or stored, processed, duplicated or circulated using
electronic systems, in any form or by means, without the prior written authorisation of Bosch Rexroth AG. In the event of
contravention of the above provisions, the contravening party is obliged to pay compensation.
This document was prepared with the greatest of care, and all statements have been examined for correctness. This
document is subject to alterations for reason of the continuing further developments of products. No liability can be
accepted for any incorrect or incomplete statements.
TPAB
1
2
M
Overview of contents
Contents Page
Features 1
Ordering details, symbol 1
Function, section 2
Technical data 2
Characteristic curves 3
Unit dimensions 4
RE 26 572/11.02
Replaces: 12.95
Pressure reducing valve,
pilot operated,
Type ZDRK 6 VP
Nominal size 6
Series 1X
Maximum operating pressure 210 bar
Maximum flow 40 L/min
Type ZDRK 6 VP5-1X/…
H/A 4085/94
Features
– Sandwich plate valve
–Porting pattern to DIN 24 340 Form A,
ISO 4401 and CETOP–RP 121 H
(locating pin 3 x 8 DIN EN ISO 8752
Material No. R900005694 – separate order)
–3 pressure stages
– Pressure reduction in port P1
– Pressure gauge connection port
– Adjustment element: Sleeve with hexagon and protective cap
Ordering details, symbol (
1
= component side,
2
= subplate side)
Symbol Setting Material No. Type description
element
50 R900564543 ZDRK 6 VP5-1X/50YMV
In channel P1 100 R900564544 ZDRK 6 VP5-1X/100YMV
210 R900564545 ZDRK 6 VP5-1X/210YMV
Secondary
pressure in bar
Pressure
relief
RE 26 572/11.02 2/4 ZDRK 6 VP
A2 P2 B2
A1 P1 B1
T2
T1
4 1 7 8 9 5 6 2
310
Type ZDRK 6 VP5-1X/…
Pressure reducing valves type ZDRK 6 VP are 3-way direct operated
pressure reducing valves of sandwich plate design with a pressure
relief function on the secondary side. It is used to reduce a system
pressure.
The pressure reducing valve basically consists of the cartridge (1)
and housing (2). The secondary pressure is set by the pressure
adjustment element (4).
At rest the valves are open; pressure fluid can flow unhindered from
port P2 to port P1. The pressure in port P1 is applied simultaneously
to the main spool (6) and via the bore (5) to the spring loaded internal
area of the main spool (6). At the same time the pressure is also
applied onto the pilot poppet (8) via orifice (9). If the pressure in port
P1 rises abvove the value set at the compression spring (7) then the
pilot poppet (8) opens. Pressure fluid flows from the spring loaded
internal area of the main spool (6) via the orifice (9) and the pilot
poppet (8) into the spring chamber (10). The main spool (6) moves
into the control position and maintains the value in port P1, which
was set at the spring (7).
If the pressure in port P1 continues to rise due to external forces at
the actuator, then the main spool (6) moves still further against the
compression spring (7).
Thereby port P1 is connected to the tank (port T) via the control land
at the main spool and housing. Enough pressure fluid flows into the
tank to ensure that the pressure does not continue to rise. The leakage
oil return from the spring chamber (10) is via port T.
A pressure gauge port (3) makes it possible to monitor the secondary
pressure at the valve.
Function, section
General
Installation Optional
Ambient temperature range °C– 20 to + 80
Weight kg Approx. 1.8
Hydraulic
Pressure fluid Mineral oil (HL, HLP) to DIN 51 524;
Fast bio-degradable pressure fluids to VDMA 24 568
(also see RE 90 221); HETG (rape seed oil); HEPG (polyglycols);
HEES (synthetic ester); Other pressure fluids on request
Pressure fluid temperature range °C– 20 … + 80
Viscosity range mm
2
/s 10 to 800
Cleanliness class to ISO code Maximum permissible degree of contamination of the pressure
fluid is to ISO 4406 (C) class 20/18/15
1)
Maximum operating pressure (input) bar 210
Maximum secondary pressure (output) bar 50; 100; 210
Maximum back pressure (port T) bar 160
Maximum flow L/min 40
Technical data (for applications outside these parameters, please consult us!)
1)
The cleanliness class stated for the components must be adhered too in hydraulic systems. Effective filtration prevents faults from
occurring and at the same time increases the component service life.
For the selection of filters see catalogue sheets RE 50 070, RE 50 076 and RE 50 081.
ZDRK 6 VP 3/4 RE 26 572/11.02
250
200
150
100
50
0
40 30 20 10 0 10 20 30 40
50
100
210
30
20
10
0
100203040
2
1
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0
0,1
010203040
Secondary pressure in bar →
p
A
–q
V
characteristic curves
Flow in L/min
P1 to T
P2 to P1
Pressure stage in bar
Pressure differential in bar →
∆p–q
V
characteristic curves
Flow
in L/min →
1 P2 to P1
2 P1 to T (3. way)
Attention!
The curve characteristics remain, with a lower set pressure, the same
in relation to the pressure rating.
q
V St
–q
V
characteristic curve at ∆p = 50 to 200 bar
Control flow in L/min →
Flow in L/min →
The characteristic curves for the pressure relief function
are valid for output pressure = zero over the complete
flow range!
Characteristic curves (measured with HLP46,
ϑ
oil
= 40 °C ± 5 °C)
RE 26 572/11.02 4/4 ZDRK 6 VP
Bosch Rexroth AG
Industrial Hydraulics
D-97813 Lohr am Main
Zum Eisengießer 1 • D-97816 Lohr am Main
Telefon 0 93 52 / 18-0
Telefax 0 93 52 / 18-23 58 • Telex 6 89 418-0
eMail documentation@boschrexroth.de
Internet www.boschrexroth.de
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. It must be
remembered that our products are subject to a
natural process of wear and ageing.
Bosch Rexroth Limited
Cromwell Road, St Neots
Cambs, PE19 2ES
Tel: 0 14 80/22 32 56
Fax: 0 14 80/21 90 52
E-mail: info@boschrexroth.co.uk
0,01/100mm
R 4
max
167
5
40
44
32,5
5,75
40,5
12,5
102
Ø 30
4 x Ø5,4
A
B
T
P
31
2
5 4 61 7
3
8
9
Unit dimensions (Dimensions in mm)
1 Name plate
2 Adjustment element (sleeve with hexagon and protective cap)
3 Valve fixing holes
4 Lock nut 24A/F
5 Hexagon 10A/F
6 Identical seal rings for ports A2, B2, P2, T2
7 Pressure gauge port: G 1/4; 12 deep, internal hexagon 6A/F
Pipe thread (G..) to ISO 228/1
8 Porting pattern to ISO 4401 and CETOP–RP 121 H,
with locating pin hole, Ø3 x 5 mm deep for a
Ø3 x 8 mm DIN EN ISO 8752 locating pin,
Material No. R900005694
(separate order)
9 Porting pattern to ISO 4401 and CETOP–RP 121 H,
with locating pin hole, Ø4 x 4 mm deep
Valve fixing screws
M5 DIN 912-10.9,
Tightening torque M
A
= 8.9 Nm,
must be ordered separately
Required surface finish of the
mating piece
