RE 21534, edition: 2015-08, Bosch Rexroth AG
Check valve
Features
▶ Sandwich plate valve for use in vertical stackings
– as angle valve
– as straight-through valve
▶ Porting pattern according to ISO 4401-03-02-0-05
andNFPA T3.5.1 R2-2002 D03
▶ Various one- and two-channel blocking functions
▶ Perfect leak-tightness due to poppet made of high-
performance plastic
▶ Corrosion-resistant surface upon request
▶ Easily adjustable to special hydraulic fluids by exchang-
ing the external seal rings
▶ With measuring ports, optional
▶ As throttle check valve upon request
Contents
Features 1
Ordering codes 2
Symbols 3, 4
Function, sections 5
Technical data 6
Characteristic curves 7
Dimensions 8, 9
Notices 10
Troubleshooting 10
Check valve installation set: Disassembly and assembly 11
Additional information 11
▶ Size 6
▶ Component series 4X
▶ Maximum operating pressure 350 bar [5076 psi]
▶ Maximum flow 40 l/min [10.6 US gpm]
RE 21534 
Edition: 2015-08
Replaces: 02.09
H7601
Type Z1S
Inhalt
Features 1
Contents 1
Ordering codes 2
Symbols: Straight-through valve (① = component side, ② =
plate side) 3
Symbols: Angle valve (① = component side, ② = plate
side) 3
Symbols: Examples for special versions (① = component
side, ② = plate side) 4
Function, sections 5
Technical data
(For applications outside these parameters, please consult
us!) 6
Characteristic curves: Straight-through valve
(measured with HLP46, ϑ
oil
= 40 ± 5 °C [104 ± 9 °F]) 7
Characteristic curves: Angle valve
(measured with HLP46, ϑ
oil
= 40 ± 5 °C [104 ± 9 °F]) 7
Dimensions: Straight-through valve
(dimensions in mm [inch]) 8
Dimensions: Angle valve
(dimensions in mm [inch]) 9
Notices 10
Troubleshooting 10
Check valve installation set: Disassembly and assembly 11
Additional information 11
Notes 12
2/12 Z1S | Check valve
Bosch Rexroth AG, RE 21534, edition: 2015-08
Ordering codes
01 Check valve, sandwich plate Z1S
02 Size 6 6
Direction of flow
03 – Straight-through valve (in the channel)
A (A2 → A1) A
B (B2 → B1) B
A (A1 → A2) C
B (B1 → B2) D
A and B (A1 → A2) and (B1 → B2) E
P and T (P2 → P1) and (T1 → T2) F
P (P2 → P1) P
T (T1 → T2) T
– Angle valve
B → A B-A
T → P T-P
AB → P AB-P
(For symbols, see page 3 and 4)
Cracking pressure
04 0.5 bar [7.25 psi] 05
1.5 bar [21.76 psi] 15
3.0 bar [43.51 psi] 30
5.0 bar [72.52 psi] 50
05 Component series 40 … 49 (40 … 49: Unchanged installation and mounting dimensions) 4X
Seal material
06 FKM seals V
Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
Corrosion resistance (outside; thick film passivated according to DIN50979Fe//Zn8//Cn//T0)
07 None (valve housing primed) no code
Improved corrosion protection (240 h salt spray test according to EN ISO 9227) J3
08 Without locating hole no code
With locating hole /60
1)
With locating hole and locking pin ISO 8752-3x8-St /62
Special version
09 Standard version no code
Measuring port P (G1/4; on channel B side) SO68
Measuring port P (G1/4; on channel A side) SO118
Measuring port A and B (G1/4) SO90
Measuring port T (G1/4) SO2
Direction of flow P1 → P2 (opposite to version "P") SO104
For symbols (examples), see page 4
10 Further details in the plain text *
01 02 03 04 05 06 07 08 09 10
Z1S 6 – 4X / V / *
1)
Locking pin ISO 8752-3x8-St, material no. R900005694
(separateorder)
Check valve | Z1S 3/12
RE 21534, edition: 2015-08, Bosch Rexroth AG
Type Z1S 6 A… Type Z1S 6 D…
1
2
TPAB
1
2
TPAB
Type Z1S 6 P… Type Z1S 6 B…
1
2
TPAB TPAB
1
2
Type Z1S 6 E… Type Z1S 6 T…
1
2
TPAB
1
2
TPAB
Type Z1S 6 C… Type Z1S 6 F…
1
2
TPAB
1
2
TPAB
Type Z1S 6 AB-P… Type Z1S 6 T-P…
1
2
TPAB
1
2
TPAB
Type Z1S 6 B-A…
1
2
TPAB
Symbols: Straight-through valve (① = component side, ② = plate side)
Symbols: Angle valve (① = component side, ② = plate side)
4/12 Z1S | Check valve
Bosch Rexroth AG, RE 21534, edition: 2015-08
Symbols: Examples for special versions (① = component side, ② = plate side)
Type Z1S 6 P.-4X/…SO68
(check valve in channel P, measuring port P Out G1/4)
Type Z1S 6 P.-4X/…SO118
(check valve in channel P, measuring port P Out G1/4)
1
2
TPAB
M
1
2
TPAB
M
Type Z1S 6 P.-4X/…SO90
(check valve in channel P, measuring port A and B G1/4)
Type Z1S 6 P.-4X/…SO2
(check valve in channel P, measuring port T G1/4)
1
2
TPAB
MM
1
2
TPAB
M
Type Z1S 6 P.-4X/…SO104
(check valve in channel P, direction of flow P1 → P2)
1
2
TPAB
T P
1
2
2
3
1
5
1
2
31
AB
4 5
Check valve | Z1S 5/12
RE 21534, edition: 2015-08, Bosch Rexroth AG
Function, sections
The valve type Z1S is a direct operated check valve in
sandwich plate design.
It is used for the leakage-free blocking in one direction and
allows for free flow in the opposite direction.
The stroke of the poppet (1) is limited by the plastic
socket (2). The installed spring (3) supports the closing
movement. When no fluid flows through the valve, the
spring (3) keeps the poppet (1) in closed position.
In contrast to the straight-through valve (section 1), the
angle valve (section 2) links or closes off up to three inter-
nal channels. Stop and sealing function are taken over by
the plug screw (4).
Notice:
For all installation positions in which the blue plastic
socket (2) is mounted at the plate side ②, no additional
seal ring may be used at this position! At the compo-
nent side ①, the seal ring (5) (as usual) seals the
assembly installed downstream.
The installed plastic socket (2) has a sealing function
and may not be removed or damaged.
Section 1: Type Z1S 6 F (straight-through valve) Section 2: Type Z1S 6 BA (angle valve)
6/12 Z1S | Check valve
Bosch Rexroth AG, RE 21534, edition: 2015-08
Technical data
(For applications outside these parameters, please consult us!)
1)
The cleanliness classes specified for the components must be
adhered to in hydraulic systems. Effective filtration prevents
faults and at the same time increases the life cycle of
thecomponents.
Available filters can be found at www.boschrexroth.com/filter.
general
Weight kg [lbs] Approx. 0.8 [1.76]
Installation position Any
Ambient temperature range °C [°F] –20 … +80 [–4 … +176]
hydraulic
Maximum operating pressure bar [psi] 350 [5076]
Cracking pressure bar [psi] 0.5; 1.5; 3; 5 [7.25; 21.76; 43.51; 72.52]
Maximum flow l/min [US gpm] 40 [10.57]
Hydraulic fluid See table below
Hydraulic fluid temperature range °C [°F] –20 … +80 [–4 … +176]
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)
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
(temperature, 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 %
▶ Bio-degradable and flame-resistant: When using hydraulic fluids
that are simultaneously zinc-solving, zinc may accumulate
(700mg zinc per pole tube).
0510 15 20 25 30 35 40
1
2
3
4
5
6
7
[101.5]
[0]
[20]
[40]
[60]
[80]
[1]
[0]
[2] [3][4] [5][6] [10.57][7][8] [9]
1
2
3
4
0510 15 20 25 30 35 40
1
2
3
4
[0]
[20]
[40]
[1]
[0]
[2] [3][4] [5][6] [10.57][7][8] [9]
5
6
7
8
9
[60]
[80]
[100]
[120]
1.1
1.2
2
3
4
Check valve | Z1S 7/12
RE 21534, edition: 2015-08, Bosch Rexroth AG
∆p-q
V
-characteristic curves (A2 → A1)
1 Cracking pressure 0.5 bar
2 Cracking pressure 1.5 bar
3 Cracking pressure 3 bar
4 Cracking pressure 5 bar
1.1 Cracking pressure 0.5 bar (B → P, B → A)
1.2 Cracking pressure 0.5 bar (A → P, T → P)
2 Cracking pressure 1.5 bar
3 Cracking pressure 3 bar
4 Cracking pressure 5 bar
Pressure differential in bar [psi] →Pressure differential in bar [psi] →
Flow in l/min [US gpm] →
Flow in l/min [US gpm] →
Characteristic curves: Straight-through valve
(measured with HLP46, ϑ
oil
= 40 ± 5 °C [104 ± 9 °F])
Characteristic curves: Angle valve
(measured with HLP46, ϑ
oil
= 40 ± 5 °C [104 ± 9 °F])
0,01/100
[0.0004/4.0]
Rzmax 4
T
A
B
4 x Ø5,3
P
4
44
64
A
B
2
A
B
40
1
11
F1
F2
F3
F4
G
6,5
4
B1
6
2
3
6
[1.58][0.16]
[0.26]
[0.24] [0.43]
[1.73]
[2.51]
[0.08]
[4 x Ø0.21]
5
H1
H2B2
6
6
[0.24]
2
8
7
1
8/12 Z1S | Check valve
Bosch Rexroth AG, RE 21534, edition: 2015-08
Dimensions: Straight-through valve
(dimensions in mm [inch])
1 Name plate
2 Identical seal rings for ports A, B, P, T (plate side)
3 Plastic socket, blue (plate side)
4 Valve mounting bores
5 Porting pattern according to ISO 4401-03-02-0-05
andNFPA T3.5.1 R2-2002 D03
6 Plug screw for measuring port,
tightening torque M
A
= 30 Nm [22.1 ft-lbs] +10 %
7 Locking pin ISO 8752-3x8-St (only version "60" and "62")
8 Bore for locking pin (only version "60" and "62")
Valve mounting screws (separate order)
4 hexagon socket head cap screws ISO 4762 - M5 - 10.9
4 hexagon socket head cap screws 10-24 UNC
Notice:
The length of the valve mounting screws of the sandwich plate
valve (screw-in depth ≥10mm[inch] 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.
① = component side
② = plate side
Type B1 B2 H1 H2
Z1S 6 C…SO68 22 [0.87] – 13.5 [0.53] –
Z1S 6 P…SO68 – 26.5 [1.04] – 13 [0.51]
Z1S 6 P…SO118 26.5 [1.04] – 13 [0.51] –
Z1S 6 P…SO90 22 [0.87] 22 [0.87] 20 [0.79] 20 [0.79]
Z1S 6 P…SO2 – 17.5 [0.69] – 20 [0.79]
Required surface quality
ofthe valve contact surface
0,01/100
[0.0004/4.0]
Rzmax 4
T
A
B
4 x Ø5,3
P
4
44
64
A
B
2
A
B
40
1
11
F1
F2
F3
F4
G
6,5
8
7
4
B3
9
20
2
3
9
[1.58]
[0.79]
[0.16]
[0.26]
[0.35] [0.43]
[1.73]
[2.51]
[0.08]
[4 x Ø0.21]
5
1
2
Check valve | Z1S 9/12
RE 21534, edition: 2015-08, Bosch Rexroth AG
Dimensions: Angle valve
(dimensions in mm [inch])
Valve mounting screws (separate order)
4 hexagon socket head cap screws ISO 4762 - M5 - 10.9
4 hexagon socket head cap screws 10-24 UNC
Notice:
The length of the valve mounting screws of the sandwich plate
valve (screw-in depth ≥10mm[inch] 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.
① = component side
② = plate side
Design B3
"AB-P" 24.5 [0.96]
"T-P" 24.5 [0.96]
"B-A" 22 [0.87]
1 Name plate
2 Identical seal rings for ports A, B, P, T (plate side)
3 Plastic socket, blue (plate side)
4 Valve mounting bores
5 Porting pattern according to ISO 4401-03-02-0-05 and
NFPA T3.5.1 R2-2002 D03
7 Locking pin ISO 8752-3x8-St (only version "60" and "62")
8 Bore for locking pin (only version "60" and "62")
9 Plug screw, tightening torque M
A
= 55 Nm [40.6 ft-lbs] +10 %
Required surface quality
ofthe valve contact surface
10/12 Z1S | Check valve
Bosch Rexroth AG, RE 21534, edition: 2015-08
Notices
Troubleshooting
▶ Valve housing (steel) and plastic spool with plastic
socket can be disassembled into individual components
for proper disposal.
▶ The check valve installation set is available separately
(plastic socket, plastic spool, spring):
Email: spare.parts@boschrexroth.de
▶ The plastic socket has a sealing function and may there-
fore not be damaged!
▶ For installation and disassembly of the check valve
installation set, a special multi-purpose tool is required,
see page
11.
External leakage at the
flow passages
Seal ring faulty. Replace seal rings (seal kit).
Lip of the plastic socket is damaged. Replace check valve installation set.
1)
Mounting screws tightened unevenly. Loosen screws and tighten them again crosswise using
the recommended tightening torque.
Internal leakage at
thecheck valve
installation set
Foreign particle on poppet surface. Check poppet surface from the outside for foreign
particles and remove them.
Poppet does not move freely. Check free movement of the poppet from the outside
using an appropriate mandrel.
Caution - do not push the plastic socket out of the
housing!
Leakage caused by downstream assembly. Check if the check valve installation set is the reason for
the leakage.
Hydraulic fluid quality does not correspond to the
specification.
Check hydraulic fluid quality and adjust it to the
specifications, if required.
Dependent on the included hydraulic fluid volume and its temperature variations, there may be pressure changes
which are not due to leakage.
If the measures described above are not successful: Completely replace the check valve installation set.
1)
External leakage at
measuring ports
Seal faulty. Replace profile seal.
Plug screw or fitting not tightened correctly. Tighten plug screw or fitting using the specified
tightening torque.
1)
Use the special multi-purpose tool to avoid damaging the plastic
socket, see page 11!
1
1
2
0,3
[0.0118]
Check valve | Z1S 11/12
RE 21534, edition: 2015-08, Bosch Rexroth AG
Check valve installation set: Disassembly and assembly
Disassembly/assembly without causing damage is achieved
by using the special multi-purpose tool (1)(separate order,
material no. R901182853).
Disassembly:
Push out the check valve installation set.
Assembly:
Insert the check valve installation set and push in the
plastic socket (2).
With correct assembly using the special multi-purpose
tool(1), the protrusion of the plastic socket (2) is
approx.0.3 mm [0.0118 inch].
Notice:
Once removed, plastic sockets may no not be
usedagain.
Assembly
Disassembly
Additional information
▶ Sandwich plates size 6 Data sheet 48052
▶ 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
Bosch Rexroth AG, RE 21534, edition: 2015-08
12/12
Z1S | 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.
Notes