1/8
Information on available spare parts:
www.boschrexroth.com/spc
Twin throttle check valve
Type Z2FS
RE 27506/05.11
Replaces: 02.03
Table of contents Features
– Sandwich plate valve
– Porting pattern according to DIN 24340 form A
– Porting pattern according to ISO 4401-03-02-0-05
(with locating hole)
– For the main or pilot flow limitation of 2 actuator ports
– 4 adjustment types:
•Setscrewwithlocknutandprotectivecap
•Lockablerotaryknobwithscale
•Spindlewithinternalhexagonandscale
•Rotaryknobwithscale
– For supply or discharge throttling
Contents Page
Features 1
Ordering code 2
Symbols 2
Function, section 3
Technical data 4
Characteristic curves 5
Unit dimensions 6, 7
H5556
Size 6
Component series 4X
Maximum operating pressure 315 bar
Maximum flow 80 l/min
Inhalt
Table of contents 1
Features 1
Ordering code 2
Symbols (① = component side, ② = plate side) 2
Function, section 3
Technical Data (For applications outside these parameters,
please consult us!) 4
Characteristic curves(measuredwithHLP46,ϑ
oil
= 40 ± 5 °C) 5
Unit dimensions (dimensions in mm) 6
Unit dimensions 7
Notes 8
2/8 Bosch Rexroth AG Hydraulics Z2FS RE 27506/05.11
Ordering code
Twin throttle check valve;
sandwich plate design
Size 6 = 6
Throttle check valve side A and B = –
1)
Throttle check valve side A = A
Throttle check valve side B = B
Adjustment type
Setscrew with lock nut and protective cap = 2
Lockablerotaryknobwithscale = 3
2)
Spindle with internal hexagon and scale = 5
Rotary knob with scale = 7
Further details in the plain text
No code = Without locating hole
/60
3)
= With locating hole
Seal material
No code = NBR seals
V = FKM seals
(other seals upon request)
Attention!
Observe compatibility of seals with hydraulic fluid
used!
1Q = With fine adjustment
2Q = Standard design
4X = Component series 40 to 49
(40 to 49: unchanged installation and connection
dimensions)
Z2FS 6 4X
*
1)
Identical adjustment types on the A and B side.
2)
H key with material no. R900008158 is included in the de-
livery.
3)
LocatingpinISO8752-3x8-St,materialno.R900005694
(separate order)
Symbols (① = component side, ② = plate side)
Standard types and standard units are contained in the
EPS (standard price list).
Supply throttling
Type Z2FS 6 –… Type Z2FS 6 B…
TPAB
1
2
TPAB
1
2
Discharge throttling
Type Z2FS 6 –… Type Z2FS 6 A…
TPAB
1
2
TPAB
1
2
5
AB
4 2
31
1
2
AB
Hydraulics Bosch Rexroth AGRE 27506/05.11 Z2FS 3/8
Function, section
ThehydraulicfluidflowingbackfromtheactuatorA②moves
the valve seat (2) against the spring (5) in the direction of the
throttle spool (3) and thus allows for the unhindered flow as
check valve. Depending on the installation position, the throt-
tling effect may be directly in the supply or in the discharge.
Main flow limitation (version "2Q")
For changing the velocity of an actuator (main flow limitation),
the twin throttle check valve is installed between the direction-
al valve and the subplate.
Pilot flow limitation (version "1Q")
With pilot operated directional valves, the twin throttle check
valve can be used as switching time adjustment (pilot flow
limitation). Then, it is installed between pilot control and
main valve.
The valve type Z2FS is a twin throttle check valve in sand-
wich plate design. It is used for the main or pilot flow limitation
of one or two actuator ports.
Two throttle check valves aligned symmetrically to each other
limit flows in one direction and allow free return flow in the op-
posite direction.
In the supply throttling, the hydraulic fluid reaches actua-
torA②throughchannel①viathethrottlingpoint(1)created
by the valve seat (2) and the throttle spool (3). The throttle
spool (3) can be axially adjusted by means of a setscrew (4)
and thus allows for the setting of the throttling point (1).
Type Z2FS 6 –2… (supply throttling)
①=componentside
②=plateside
4/8 Bosch Rexroth AG Hydraulics Z2FS RE 27506/05.11
Technical Data (For applications outside these parameters, please consult us!)
general
Weight kg Approx. 0.8
Installation position Any
Ambient temperature range °C –20 to +80
hydraulic
Maximum operating pressure bar 315
Maximum flow l/min 80
Hydraulic fluid See table below
Hydraulic fluid temperature range °C –20 to +80
Viscosity range mm
2
/s 10 to 800
Maximum permitted degree of contamination of the hydraulic fluid -
cleanliness class according to ISO 4406 (c)
Class 20/18/15
1)
1)
The cleanliness classes specified for the components must
be adhered to in hydraulic systems. Effective filtration pre-
vents faults and at the same time increases the service life
of the components.
For the selection of the filters see
www.boschrexroth.com/filter.
Hydraulic fluid Classification Suitable sealing materials Standards
Mineral oils and related hydrocarbons HL,HLP,HLPD NBR, FKM DIN 51524
Environmentally
compatible
– Insoluble in water
HETG NBR, FKM
ISO 15380
HEES FKM
– Soluble in water HEPG FKM ISO 15380
Flame-resistant
– Water-free HFDU, HFDR FKM ISO 12922
– Water-containing
HFC (Fuchs Hydrotherm 46M,
Petrofer Ultra Safe 620)
NBR ISO 12922
Important information on hydraulic fluids!
– For more information and data on the use of other hydrau-
lic fluids refer to data sheet 90220 or contact us!
– There may be limitations regarding the technical valve
data (temperature, pressure range, service life, mainte-
nance intervals, etc.)!
– Flame-resistant – water-containing:
• Maximumoperatingpressure210bar
• Maximumhydraulicfluidtemperature60°C
• ExpectedservicelifeascomparedtoHLPhydraulicoil
30 % to 100 %
23 45 67 8
9
10
11
250
200
150
100
90
80
70
60
50
40
30
20
10
5
01020304050607080
11,5
23 45 67 8
250
200
150
100
90
80
70
60
50
40
30
20
10
5
01020304050607080
910 11 11,5
15
10
5
01020304050607080
Hydraulics Bosch Rexroth AGRE 27506/05.11 Z2FS 5/8
∆p-q
V
characteristic curves
(via check valve; throttle closed)
∆p-q
V
characteristic curves (version "2Q") ∆p-q
V
characteristic curves (version "1Q")
Pressure differential in bar →
Pressure differential in bar →
Pressure differential in bar →
Flowinl/min→
Flowinl/min→
Throttle position in rotations Throttle position in rotations
Characteristic curves(measuredwithHLP46,ϑ
oil
= 40 ± 5 °C)
0,01/100
Rzmax 4
3
82 0
61 x 40
1,4
75
81
38,6
22,6
35
64
18
4 x 5,4
45 81
45
46
8
32
82 901
75 24
20
91
3
A
T
B
P
13
5; 12
11
1
10
15
6
133; 12
19; 12 4 29; 12 2134 9; 12
1314 14
7
"X"
"X"
"X"
"X"
"X"
38,6
"X"
7
81
7
1
15
8
32
61 x 40
1,4
11
10
46
8
61 x 40
1,4
11
10
F1
F2
F3F4 G
45
7
1
2
1
2
1
2
6/8 Bosch Rexroth AG Hydraulics Z2FS RE 27506/05.11
Unit dimensions (dimensions in mm)
Item explanations and valve mounting screws see page 7.
Required surface quality of the
valve mounting face
Hydraulics Bosch Rexroth AGRE 27506/05.11 Z2FS 7/8
Unit dimensions
① Component side – porting pattern according to
ISO 4401-03-02-0-05 (with locating hole Ø3 x 5 mm
deep)
② Plate side – porting pattern according to
DIN 24340 form A (without locating hole), or
ISO 4401-03-02-0-05 (with locating hole for locating
pin ISO 8752-3x8-St; version "/60")
1 Name plate
2 Adjustment type "2"
3 Adjustment type "3"
4 Adjustment type "5"
5 Adjustment type "7"
6 Space required to remove the key
7 Valve mounting bores
8 LocknutSW10
9 Set screw/spindle for changing the flow cross-section
(internal hexagon SW5)
10 Identical seal rings for ports A, B, P, and T
11 Seal ring plate
12 With all adjustment types:
Counterclockwise rotation = larger flow
Clockwise rotation = smaller flow
13 The unit is converted from supply to discharge throt-
tling by rotating it around the "X"–"X" axis
14 Stroke
15 Plug screw SW22
Valve mounting screws (separate order)
4 hexagon socket head cap screws ISO 4762 - M5 - 10.9
Note!
Lengthandtighteningtorqueofthevalvemountingscrews
must be calculated according to the components mounted un-
der and over the sandwich plate valve.
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 Z2FS RE 27506/05.11
Notes