RE 21553, Edition 2015-11, Bosch Rexroth AG
Check valve,
pilot operated
Features
▶ Sandwich plate valve for use in vertical stackings
▶ Porting pattern according to ISO 4401-05-04-0-05,
ISO 4401-05-05-0-05 and NFPA T3.5.1 R2-2002 D05
▶ For the leakage-free blocking of one or two actuator
ports, optional
▶ Various cracking pressures
▶ With pre-opening (standard); without pre-opening
(optional)
▶ Check valve installation sets available individually
▶ Special versions upon request
Contents
Features 1
Ordering codes 2
Symbols 3
Function, sections, circuit example 4 … 6
Technical data 7
Characteristic curves 8
Dimensions 9
Inductive position switch type QM 10
Mating connectors 11
Additional information 12
▶ Size 10
▶ Component series 3X
▶ Maximum operating pressure 315 bar [4568 psi]
▶ Maximum flow 120 l/min [31.7 US gpm]
RE 21553 
Edition 2015-11
Replaces: 07.10
Z2S10
Type Z2S
Inhalt
Features 1
Contents 1
Ordering codes 2
Symbols (① = component side, ② = plate side) 3
Function, sections, circuit example 4
Function, sections 5
Function, sections 6
Technical data
(For applications outside these values, please consult us!)
7
Characteristic curves
(measured with HLP46, ϑ
Oil
= 40 ± 5 °C [104 ± 9 °F]) 8
Dimensions
(dimensions in mm [inch]) 9
Inductive position switch type QM: Electrical connection 10
Inductive position switch type QM: Switching logics 10
Mating connectors
(dimensions in mm [inch]) 11
Further information 12
2/12 Z2S | Check valve
Bosch Rexroth AG, RE 21553, Edition 2015-11
Ordering codes
01 Check valve, sandwich plate Z2S
02 Size 10 10
Leakage-free blocking
03 In channel A and B –
In channel A A
In channel B B
Cracking pressure
04 1.5 bar [21.7 psi] 1
3 bar [43.5 psi] 2
6 bar [87.0 psi] 3
10 bar [145.0 psi] 4
05 Component series 30 … 39 (30 … 39: unchanged installation and connection dimensions) 3X
Corrosion resistance (outside; thick film passivation according to DIN50979 – Fe//Zn8//Cn//T0)
06 None (valve housing primed) no code
Improved corrosion protection (240 h salt spray test according to EN ISO 9227) J3
Seal material
07 NBR seals no code
FKM seals V
Observe compatibility of seals with hydraulic fluid used! (Other seals upon request)
Additional pilot oil ports X and Y
1)
08 Without X and Y no code
With X and Y XY
Spool position monitoring
2)
09 Without position switch no code
– Inductive position switch type QM (version "3" only)
Monitored spool position "a" QMA
Monitored spool position "b" QMB
Special version
10 Without no code
Check valve with stroke limitation SO14
Control open by external port G1/4 (only version "A" and "B") SO40
Without pre-opening SO41
Control spool unloaded to port T SO60
With pre-opening and control open from channel P SO150
For symbols (examples), see page 3
11 For further information, see the plain text *
01 02 03 04 05 06 07 08 09 10 11
Z2S 10 – 3X / *
1)
In version "SO150", ports X and Y are already in place.
(Noordering code required)
2)
Only with version "3" (cracking pressure 6 bar) and on side with
leakage-free blocking. E.g. Z2S10A3-3X/QMA
Check valve | Z2S 3/12
RE 21553, Edition 2015-11, Bosch Rexroth AG
Symbols (① = component side, ② = plate side)
Notice:
Deviating from ISO 4401, port T is called TA and port T1 is called
TB in this data sheet.
Version "A" Version "–", "–…SO41" and "–…SO14"
PA
BT
B
2
1
TA PA
BT
B
2
1
TA
Version "B"
PA
BT
B
2
1
TA
Version "A…SO40" Version "A…SO60"
G1/4
1
2
TA TBPAB
PA
BT
B
2
1
TA
Version "–…SO150"
PA
BT
B
2
1
TA
3,0
X Y
Version "A3…QMA" Version "B3…QMB"
1
2
TA TBPAB
1
2
TA TBPAB
PT
AB
1
2
TA
A
PB TB
14
TA
A
PB TB
1
2
5
TA
A
PB TB
1
3
24
TA
A
PB TB
1
2
4/12 Z2S | Check valve
Bosch Rexroth AG, RE 21553, Edition 2015-11
Function, sections, circuit example
The isolator valve type Z2S is a releasable check valve in
sandwich plate design.
It is used for the leakage-free blocking of one or two actua-
tor ports, also in case of longer standstill times.
In direction A① to A② or B① to B②, there is a free flow;
in the opposite direction, the flow is blocked.
If, for example, there is a flow through the valve in
direction A① to A②, the control spool (1) is moved in the
direction of the B side, opens the ball seat valve (2) and
then pushes the poppet (3) off its seat. Hydraulic fluid can
now flow from B② to B①.
In order to allow the ball seat valve (2) to be safely closed,
the control spool (1) must be hydraulically unloaded
(seecircuit example).
Due to the pre-opening, there is a damped decompression
of the pressurized liquid. Thus, possible switching shocks
are avoided.
Pre-opening
▶ The two-stage set-up with an increased control open
ratio means even low pilot pressure can be
unloadedsecurely.
▶ Avoidance of switching shocks due to dampened
decompression of the pressure volume on the
actuatorside.
Type Z2S 10 –… (with pre-opening)
Type Z2S 10 A…
① = component side
② = plate side
1 Control spool, areaA
2
2 Ball, areaA
3
4 Poppet, areaA
1
5 Stop
Circuit example,
schematic
Notice:
Deviating from ISO 4401, port T
is called TA and port T1 is called
TB in this data sheet.
TA
A
PB TB
14
TA
A
PB TB
1
2
TA
A
PB TB
14
TA
A
PB TB
1
2
3
G1/4
2
TA
A
PB TB
14
TA
A
PB TB
1
2
52 6
Check valve | Z2S 5/12
RE 21553, Edition 2015-11, Bosch Rexroth AG
Function, sections
Type Z2S 10 –…S041 (no pre-opening)
Type Z2S 10 A…SO40
Type Z2S 10 A…SO60
① = component side
② = plate side
1 Control spool, areaA
2
2 Ball, areaA
3
4 Poppet, areaA
1
5 Stop
6 Control spool, areaA
4
Notices:
▶ In valves without pre-opening, sudden unloading of pent-up
pressure volume may occur. Resulting switching shocks may
lead to premature wear on installed components, as well as
noise formation.
▶ Deviating from ISO 4401, port T is called TA and port T1 is
called TB in this data sheet.
TA
A
PB TB
1
3
4
TA
A
PB TB
1
2
6/12 Z2S | Check valve
Bosch Rexroth AG, RE 21553, Edition 2015-11
Function, sections
Type Z2S 10 A…SO14
① = component side
② = plate side
1 Control spool,
areaA
2
4 Poppet, areaA
1
Check valve | Z2S 7/12
RE 21553, Edition 2015-11, Bosch Rexroth AG
Technical data
(For applications outside these values, please consult us!)
1)
The cleanliness classes specified for the components must be
adhered to in hydraulic systems. Effective filtration prevents faults
and simultaneously increases the life cycle of the components.
Available filters can be found at www.boschrexroth.com/filter.
Hydraulic fluid Classification Suitable sealing
materials
Standards Data sheet
Mineral oils HL, HLP, HLPD, HVLP, HVLPD NBR, FKM DIN 51524 90220
Bio-degradable ▶ insoluble in water HETG NBR, FKM ISO15380 90221
HEES FKM
▶ soluble in water HEPG FKM ISO15380
Flame-resistant ▶ water-free HFDU, HFDR FKM ISO 12922 90222
▶ containing water HFC (Fuchs Hydrotherm 46M,
Petrofer Ultra Safe 620)
NBR ISO 12922 90223
Important information on hydraulic fluids:
▶ For more information and data on the use of other hydraulic
fluids, please refer to the data sheets above or contact us.
▶ There may be limitations regarding the technical valve data (tem-
perature, pressure range, life cycle, maintenance intervals, etc.).
▶ The flash point of the hydraulic fluid used must be 40 K higher
than the maximum solenoid surface temperature.
▶ Flame-resistant – containing water:
– Maximum pressure differential per control edge 50 bar
– Pressure pre-loading at the tank port > 20 % of the pressure
differential, otherwise increased cavitation
– Life cycle as compared to operation with mineral oil HL, HLP
50 to 100 %
hydraulic
Maximum operating pressure bar [psi] 315 [4568]
Cracking pressure in free direction see characteristic curves page 8
Maximum flow l/min [US gpm] 120 [31.7]
Direction of flow See symbols page 3
Hydraulic fluid See table below
Hydraulic fluid temperature range
(at the valve service ports)
°C [°F] –30 … +80 [–22 … +176] (NBR seals)
–20 … +80 [–4 … +176] (FKM seals)
Viscosity range mm
2
/s [SUS] 2.8 … 500 [35 … 2320]
Maximum admissible degree of contamination of the hydraulic fluid
cleanliness class according to ISO 4406 (c)
Class 20/18/15
1)
Area ratio ▶ Without pre-opening A
1
/A
2
~ 1/3 (see sectional drawing page 4 … 6)
▶ With pre-opening A
3
/A
2
~ 1/11.5 (see sectional drawing page 5 and 6)
▶ Version "SO60" A
1
/A
4
~ 1/6 (see sectional drawing page 5)
general
Weight kg [lbs] Approx. 3 [6.6]
Installation position Any
Ambient temperature range °C [°F] –30 … +80 [–22 … +176] (NBR seals)
–20 … +80 [–4 … +176] (FKM seals)
Notice:
Selection of optimal sealing material (see ordering code
page2) also depends on the type of hydraulic fluid used.
1
2
1,2,3,4
55
1,2,3,4
1
2
65
1,2,3,4
10 20 30 40 50 60 70 80 90 100 110 120
5
10
15
20
25
4
3
2
1
5
6
0
[0]
[5] [10] [20][15] [31.7]
0
[362]
[0]
[50]
[100]
[150]
[200]
[250]
[30][25]
[300]
8/12 Z2S | Check valve
Bosch Rexroth AG, RE 21553, Edition 2015-11
Characteristic curves
(measured with HLP46, ϑ
Oil
= 40 ± 5 °C [104 ± 9 °F])
∆p-q
V
characteristic curves
Flow in l/min [US gpm]
→
Pressure differential in bar [psi] →
Cracking pressure:
1 1.5 bar [21.7 psi]
2 3 bar [43.5 psi]
3 6 bar [87.0 psi]
4 10 bar [145.0 psi]
5 Check valve controlled open via control spool
6 Free flow (without check valve use), version "A" and "B"
0,01/100
[0.0004/4.0]
Rz1max 4
105
[4.13]
105
[4.13]
L2
L1
132
[5.2]
AB
14
2
3
1
2
6
5.15.2
F1 F2
F4 F3
TBTA
A
P
BYX
12
122
[0.079]
51
[2.01]
6,5
[0.256]
29
[1.14]
50
[1.97]
69,5
[2.74]
39
[1.54]
4 x Ø6,7
[Ø0.26]
[0.472]
[0.472]
Check valve | Z2S 9/12
RE 21553, Edition 2015-11, Bosch Rexroth AG
①
component side
②
plate side
1 Name plate
2 Through hole for valve mounting
3 Identical seal rings for ports A, B, P, TA, and TB
4
Plug screw SW30, tightening torque M
A
= 40
+5
Nm [29.5
+3.7
ft-lbs]
5.1 Version with position switch "QMA" (circuitry see page 10)
5.2 Version with position switch "QMB" (circuitry see page 10)
6 Porting pattern according to ISO 4401-05-04-0-05,
ISO 4401-05-05-0-05 and NFPA T3.5.1 R2-2002 D05; deviating
from ISO 4401, port T is called TA and port T1 is called TB in
this data sheet.
Valve mounting screws (separate order)
4 hexagon socket head cap screws ISO 4762 - M6 - 10.9
4 hexagon socket head cap screws 1/4-20 UNC
Notice:
The length of the valve mounting screws of the sandwich plate
valve must be selected according to the components mounted
under and over the isolator valve.
Depending on the application, screw type and tightening torque
must be adjusted to the circumstances.
Please ask Rexroth for screws with the required length.
"SO14" "no code" "SO40" "SO41" "SO60" "SO150"
Version "A" Version "B"
L1 in mm [inch] 13.5 [0.53] 13.5 [0.53] 6.5 [0.26] 13.5 [0.53] 13.5 [0.53] 13.5 [0.53] 13.5 [0.53]
L2 in mm [inch] 38.5 [1.52] 13.5 [0.53] 13.5 [0.53] 6.5 [0.26] 13.5 [0.53] 13.5 [0.53] 13.5 [0.53]
Required surface quality of
the valve contact surface
Dimensions
(dimensions in mm [inch])
10/12 Z2S | Check valve
Bosch Rexroth AG, RE 21553, Edition 2015-11
Inductive position switch type QM: Electrical connection
The electric connection is realized via a 4-pole mating
connector (separate order, see page 11) with connec-
tion thread M12 x 1.
Connection voltage: 24 V +30 %/–15 %, direct voltage
Admissible residual ripple: ≤ 10 %
Load capacity: Maximum 400 mA
Switching outputs: PNP transistor outputs, load between switching outputs and GND
4
3
1
2
+
–
GND
Pinout: 1 +24 V
4
1
2
3
2 Switching output: 400 mA
3 0 V, GND
4 Switching output: 400 mA
Inductive position switch type QM: Switching logics
PIN 2
1
0
PIN 4
1
0
10
Spool stroke in % →
Leakage oil →
Overlap
Check valve | Z2S 11/12
RE 21553, Edition 2015-11, Bosch Rexroth AG
Mating connectors
(dimensions in mm [inch])
For further information refer to data sheet 08006.
Mating connector suitable for K24 4-pole, M12 x 1
with screw connection, cable gland Pg 9.
Material no. R900031155
Mating connector suitable for K24 4-pole, M12 x 1
with screw connection, cable gland Pg 9, angled.
Housing rotatable by 4 x 90° in relation to the contact insert.
Material no. R900082899
54
M12 x 1
Ø19,6


M12 x 1
Ø19,6
35
40



Mating connector suitable for K24-3m 4-pole, M12 x 1
with potted-in PVC cable, 3 m long.
Line cross-section: 4 x 0.34 mm
2
Core marking: 1
2
3
4
brown
white
blue
black
Material no. R900064381
41,5
M12 x 1
Ø14,5


Bosch Rexroth AG, RE 21553, Edition 2015-11
12/12
Z2S | Check valve
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
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 statements
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.
Further information
▶ Subplates Data sheet 45052
▶ Inductive position switch and proximity sensors (contactless) Data sheet 24830
▶ Smoothly switching version Data sheet 23183
▶ Hydraulic fluids on mineral oil basis Data sheet 90220
▶ Environmentally compatible hydraulic fluids Data sheet 90221
▶ Flame-resistant, water-free hydraulic fluids Data sheet 90222
▶ Flame-resistant hydraulic fluids - containing water (HFAE, HFAS, HFB, HFC) Data sheet 90223
▶ Reliability characteristics according to ENISO13849 Data sheet 08012
▶ Hexagon socket head cap screw, metric/UNC Data sheet 08936
▶ Hydraulic valves for industrial applications Operating instructions 07600-B
▶ General product information on hydraulic products Data sheet 07008
▶ Assembly, commissioning and maintenance of industrial valves Data sheet 07300
▶ Selection of filters www.boschrexroth.com/filter
▶ Information on available spare parts www.boschrexroth.com/spc