1/6
Check valve,
pilot operated
Type Z2S
Size 25
Component series 5X
Maximum operating pressure 315 bar
Maximum flow 450 l/min
RE 21564/08.05
Replaces: 02.03
Table of contents Features
– Sandwich plate valve
– Position of ports to ISO 4401-08-07-0-94
– For the leak-free closure of one or two actuator ports, optional
– For use in vertical stacking assemblies
– 4 different cracking pressures, optional
K3826-12
Information on available spare parts:
www.boschrexroth.com/spc
Contents Page
Features 1
Ordering code 2
Standard types 2
Symbols 2
Function, section, circuit example 3
Technical data 4
Characteristic curves 4
Unit dimensions 5
Further standard types and components can be
found in the EPS (standard price list).
2/6 Bosch Rexroth AG Hydraulics
Z2S RE 21564/08.05
Ordering code
Sandwich plate check valve
Size 25 = 22
Leak-free closure
In channels A and B = –
In channel A = A
In channel B = B
Cracking pressure
3 bar = 1
5 bar = 2
7,5 bar = 3
10 bar = 4
Further details in clear text
Seal material
no code = NBR seals
V = FKM seals
Caution!
Observe compatibility of seal material with hydraulic
fluid used!
5X = Component series 50 to 59
(50 to 59: unchanged installation and connection dimensions)
Z2S 22 5X
*
Type Material number
Z2S 22 -1-5X/ R900432915
Z2S 22 A1-5X/ R900433032
Z2S 22 B1-5X/ R900433037
Standard types
Symbols (
1
= component side,
2
= plate side)
Type Z2S 22 A… Type Z2S 22 –…
P A B T
2
1
XL Y
P A B T
2
1
L YX
Type Z2S 22 B…
P A B T
2
1
L X Y
A1 B1
P T
A2
B2
A
B
A
B
6 5
1
4
3
2
1
2
Hydraulics Bosch Rexroth AG
RE 21564/08.05 Z2S
3/6
Function, section, circuit example
Isolator valves of type Z2S are pilot operated check valves of
sandwich plate design.
They are used for the leak-free closure of one or two actuator
ports, even over longer periods of standstill.
In direction A1 to A2 or B1 to B2 the fluid can flow freely,
whereas in the opposite direction the flow is blocked.
When fluid flows through the valve in the direction from A1 to
A2, spool (1) is pressurised and shifted to the right. This caus-
es ball seat valve (2) to open and then pushes poppet (3) off
its seat.
In order to ensure reliable closing of the valve poppets, the ac-
tuator ports of the directional valve must be unloaded to the
tank in the central position (see circuit example).
4 Area A
1
5 Area A
2
6 Area A
3
0 50 100 150 200 250 350
0
5
10
15
20
25
400 450300
30
1
4
2
3
4/6 Bosch Rexroth AG Hydraulics
Z2S RE 21564/08.05
Technical data (for applications outside these parameters, please consult us!)
1)
Suitable for NBR and FKM seals
2)
Suitable only for FKM seals
3)
The cleanliness classes specified for components must be
adhered to in hydraulic systems. Effective filtration prevents
Hydraulic
Maximum operating pressure bar 315
Cracking pressure in free direction See characteristic curves below
Maximum flow l/min 450
Direction of flow See symbols on page 2
Hydraulic fluid Mineral oil (HL, HLP) to DIN 51524
1)
; fast bio-degradable
hydraulic fluids to VDMA 24568 (see also RE 90221); HETG
(rape seed oil)
1)
; HEPG (polyglycols)
2)
; HEES (synthetic
esters)
2)
; other hydraulic fluids on enquiry
Hydraulic fluid temperature range °C –30 to +80 (NBR seals)
–20 to +80 (FKM seals)
Viscosity range mm
2
/s 2.8 to 500
Max. permissible degree of contamination of the hy-
draulic fluid - cleanliness class to ISO 4406 (c)
Class 20/18/15
3)
Area ratio
A
1
/A
2
= 1/13.6; A
3
/A
2
= 1/2.8 (see sectional drawing, page 2)
malfunction and, at the same time, prolongs the service life
of components.
For the selection of filters, see data sheets RE 50070,
RE 50076, RE 50081, RE 50086 and RE 50088.
General
Weight kg approx. 12
Installation orientation Optional
Ambient temperature range °C –30 to +50 (NBR seals)
–20 to +50 (FKM seals)
Characteristic curves (measured with HLP46, ϑ
oil
= 40 °C ± 5 °C)
Flow in l/min →
Pressure differential in bar →
Δp-q
V
charactersistic curves
A1 → A2; B1 → B2
A2 → A1; B2 → B1
Cracking pressure:
1 3 bar
2 5 bar
3 7.5 bar
4 10 bar
0,01/100mm
Rzmax 4
240
P
41,4
117
T
Y
270
270
59
100
4
300
B
A
71,4
Ø6
2.1
3
6
8
4
275
T
Y
2.2 1
F1
F2
F3
F4
F5
F6
G1
G2
11
10
9
L
X
12,5
28,4
6 x Ø12
SW40
SW40
Hydraulics Bosch Rexroth AG
RE 21564/08.05 Z2S
5/6
Unit dimensions (nominal dimensions in mm)
Required surface quality
of mating surface
1
Valve with cracking pressure 3 or 5 bar,
leak-free closure in channel A and/or B
2
Valve with cracking pressure 7.5 or 10 bar,
leak-free closure in channel A and B
2.1
Valve with cracking pressure 7.5 or 10 bar,
leak-free closure in channel A
2.2
Valve with cracking pressure 7.5 or 10 bar,
leak-free closure in channel B
3
Nameplate
4
6 through-bores for valve fixing
5
Identical seal rings for ports A, B, P, T
6
Identical seal rings for ports X, Y, L
7
Locating pins
8
Locating bores
9
Plate side
10
Component side
11
Position of ports to ISO 4401-08-07-0-94
Valve fixing screws (separate order)
6 socket head cap screws ISO 4762 - M12 - 10.9
(friction coefficient µ
total
= 0.14);
tightening torque M
T
= 130 Nm
(please adjust in the case of changed surfaces)
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified above only serve to describe the product. No state-
ments concerning a certain condition or suitability for a certain application
can be derived from our information. The information given does not
release the user from the obligation of own judgment and verification. It
must be remembered that our products are subject to a natural process of
wear and aging.
6/6 Bosch Rexroth AG Hydraulics
Z2S RE 21564/08.05
Notes
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified above only serve to describe the product. No state-
ments concerning a certain condition or suitability for a certain application
can be derived from our information. The information given does not
release the user from the obligation of own judgment and verification. It
must be remembered that our products are subject to a natural process of
wear and aging.
Hydraulics Bosch Rexroth AG
RE 21564/08.05 Z2S
7/6
Notes
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified above only serve to describe the product. No state-
ments concerning a certain condition or suitability for a certain application
can be derived from our information. The information given does not
release the user from the obligation of own judgment and verification. It
must be remembered that our products are subject to a natural process of
wear and aging.
8/6 Bosch Rexroth AG Hydraulics
Z2S RE 21564/08.05
Notes
