1/8
Check valve,
pilot operated
Type Z2S
Size 6
Component series 6X
Maximum operating pressure 315 bar [4568 psi]
Maximum flow 60 l/min [15.8 US gpm]
RE 21548/02.09
Replaces: 07.05
Table of contents Features
– Sandwich plate valve for use in vertical stackings
– Porting pattern according to DIN 24340 form A (without
locating bore) (standard)
– Porting pattern according to ISO 4401-03-02-05 and
NFPA T3.5.1 R2-2002 D03 (with locating bore)
–
For the leak-free blocking of one or two actuator ports, optionally
– Various cracking pressures
– Special versions upon request
– Supplementary documentation:
•SandwichplatesNG6,seeRE48050
•Hydraulicfluidsonmineraloilbasis,seeRE90220
Information on available spare parts:
www.boschrexroth.com/spc
Contents Page
Features 1
Ordering code 2
Symbols 3
Function, sections 4, 5
Technical data 6
Characteristic curves 7
Unit dimensions 8
tb0256
Inhalt
Table of contents 1
Features 1
Ordering code 2
Symbols (① = device side, ② = plate side) 3
Function, sections, sample circuit 4
Function, sections 5
Technical data (For applications outside these parameters,
please consult us!) 6
Characteristic curves(measuredwithHLP46,ϑ
oil
= 40°C ±
5°C [104 °F ± 9 °F]) 7
Unit dimensions (dimensions in mm) 8
2/8 Bosch Rexroth AG Hydraulics Z2S 6 RE 21548/02.09
Ordering code
Check valve, sandwich plate
Size 6 = 6
Leak-freeblockinginchannelAandB = –
Leak-freeblockinginchannelA = A
Leak-freeblockinginchannelB = B
Cracking pressure
1.5 bar [21.7 psi] = 1
3 bar [43.5 psi] = 2
6 bar [86.0 psi] = 3
Componentseries60to69 = 6X
(60to69:unchangedinstallationandconnectiondimensions)
Surface without corrosion resistance
1)
= No code
Seal material
NBRseals = No code
FKM seals = V
Note!
With regard to the selection, observe the dependency of the operating
parameters (fluid, temperature, etc.)!
Further details in the clear text
Special version
No code = Without
SO40 = Opening via external port
G1/4(onlyversion“A”and“B”)
SO55 = With pre-opening
SO60 = Pilot piston to
“T”portunloade
d
SO150 = With pre-opening and open
controlfromchannel“P”
Symbols (examples), see page 3
No code = Without locating bore
/60
2)
= With locating bore
/62 = With locating bore and locating pin
ISO 8752-3x8-St
Z2S 6 6X
*
1)
Corrosion-resistant surface upon request.
2)
LocatingpinISO8752-3x8-St,
material no. R900005694 (separate order)
Hydraulics Bosch Rexroth AGRE 21548/02.09 Z2S 6 3/8
Type Z2S 6 A… Type Z2S 6 –… and Z2S 6 –…SO55
PABT
2
1
PABT
2
1
Type Z2S 6 B…
PABT
2
1
Type Z2S 6 A…SO40 Type Z2S 6 A…SO60
PABT
2
1
G1/4
PABT
2
1
Type Z2S 6 –…SO150
PABT
2
1
1,0
Symbols (① = device side, ② = plate side)
PT
AB
1
2
A
AB
12
2
B
1
2
A
AB
12
3
B
1
2
4/8 Bosch Rexroth AG Hydraulics Z2S 6 RE 21548/02.09
Function, sections, sample circuit
The non-return valve Type Z2S is a pilot operated check
valve in sandwich plate design.
It is used for the leak-free blocking of one or two actuator
ports, also in case of longer standstill times.
InthedirectionA①toA②orB①toB②,thereisafreeflow,
in the opposite direction, the flow is blocked.
Ifthevalveis,forexample,flownthroughinthedirectionA①
toA②,thepilotpiston(1)ismovedtowardstheBsideand
pushes the poppet (2) off its seat. Now, hydraulic fluid can
flowfromB②toB①.
In order to allow for a safe closing of the poppets (2), the pilot
piston (1) must be hydraulically unloaded (see sample circuit).
Type Z2S 6 –…
Type Z2S 6 A…
①=Deviceside
②=Plateside
1 Pilot piston, area A
2
2 Poppet, area A
1
3 Positive stop
Sample circuit,
schematic
A
AB
142
B
1
2
A
AB
12
3
B
1
2
G1/4
A
AB
12
3
B
1
2
T
T
Hydraulics Bosch Rexroth AGRE 21548/02.09 Z2S 6 5/8
Function, sections
Type Z2S 6 –…SO55
Type Z2S 6 A…SO40
Type Z2S 6 A…SO60
“SO55” version (with pre-opening)
This valve is provided with an additional pre-opening feature.
BypressurizationoftheXport,thepilotpiston(1)ismovedto
theright.Bydoingso,youfirstlypushtheball(5)offtheseat
and then the poppet (2). Now, the valve can also be flown
throughfromBtoA.
①=Deviceside
②=Plateside
1 Pilot piston,
area A
2
2 Poppet, area A
1
3 Positive stop
Due to the pre-opening, there is a damped decompression
of the pressurized fluid. Thus, possible switching shocks are
avoided.
1 Pilot piston, area A
2
2 Poppet, area A
1
4 Pre-opening, area A
3
6/8 Bosch Rexroth AG Hydraulics Z2S 6 RE 21548/02.09
Technical data (For applications outside these parameters, please consult us!)
1)
SuitableforNBRandFKMseals
2)
The cleanliness classes specified for the components
mustbeadheredtoinhydraulicsystems.Efficientfiltration
prevents malfunctions and at the same time prolongs the
service life of components.
For the selection of the filters, see data sheets RE50070,
RE50076,RE50081,RE50086,RE50087andRE50088.
hydraulic
Maximum operating pressure
bar [psi] 315 [4568]
Cracking pressure in free direction See characteristic curves page 6
Maximum flow
l/min [USgpm] 60 [15.8]
Flow direction See symbols page 3
Hydraulicfluid Mineraloil(HL,HLP)accordingtoDIN51524
1)
; other
hydraulic fluids upon request
Hydraulicfluidtemperaturerange
°C [°F] –30 to +80 [–22 to +176](NBRseals)
–20 to +80 [–4 to +176] (FKM seals)
Viscosity range
mm
2
/s [SUS] 2.8 to 500 [35 to 2320]
Maximum permitted degree of contamination of the hydraulic fluid -
cleanliness class according to ISO 4406 (c)
Class 20/18/15
2)
Area ratio – without pre-opening A
1
/A
2
~ 1/3.5 (see section page 4)
– with pre-opening A
3
/A
2
~ 1/12.5 (see section page 4)
general
Weight
kg [lbs] ca. 0.8 [1.76]
Installation position Any
Ambient temperature range
°C [°F] –30 to +80 [–22 to +176](NBRseals)
–20 to +80 [–4 to +176] (FKM seals)
Hydraulics Bosch Rexroth AGRE 21548/02.09 Z2S 6 7/8
Characteristic curves(measuredwithHLP46,ϑ
oil
= 40°C ± 5°C [104 °F ± 9 °F])
Flow in l/min [US gpm] →
Pressure differential in bar [psi] →
∆p-q
V
characteristic curves
Cracking pressure:
1
1.5 bar [21.7 psi]
2
3 bar [43.5 psi]
3
6 bar [87.0 psi]
4 Check valve opened by piston
5 Free flow (without check valve insert),
version“A”and“B”
1,2,3 4 1,2,3 4
2
1
5 1,2,3 4
2
1
0,01/100
[0.0004/4.0]
Rzmax 4
44,5
40
80
L1
A B
24,5
L1
P
A
T
B
4 x 5,4
19
36
4
F1 F2
F4 F3G
7
5
7
1
2
[3.15] [1.75]
[0.96]
[1.57]
[0.75]
[0.28]
[Ø0.21]
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 informa-
tion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 applica-
tion 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.
8/8 Bosch Rexroth AG Hydraulics Z2S 6 RE 21548/02.09
Unit dimensions (dimensions in mm)
① Device side – porting pattern according to
DIN 24340 form A (without locating bore), or
ISO 4401-03-02-0-05 (with locating bore Ø4 x 4 mm
deep) and NFPA T3.5.1 R2-2002 D03
② Plate side – porting pattern according to
DIN 24340 form A (without locating bore), or
ISO 4401-03-02-0-05 (with locating bore for locat-
ingpinISO8752-3x8-St;version“/60”and“/62”)and
NFPA T3.5.1 R2-2002 D03
3 Nameplate
4 Through bore for valve mounting
5 IdenticalsealringsforportsA,B,P,T
6 LocatingpinISO8752-3x8-St(onlyversion“/62")
7 Plug screw 22 A/F,
Tightening torque M
T
= 25
+5
Nm [18.4
+3.7
ft-lbs]
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
Note!
The length of the valve mounting screws of the sandwich
platevalve(screw-indepth≥10mm [0.39 inch]) must be se-
lected according to the components mounted under and over
the check 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.
L1 in mm [inch]
“No code” “SO40” “SO55” “SO60” “SO150”
11 [0.43] 11 [0.43] 11 [0.43] 21.5
1)
[0.85]
11 [0.43] 21.5 [0.85]
1)
Maximum dimension on the side of the check valve use
Required surface quality of the
valve mounting face