1/8

Information on available spare parts:

www.boschrexroth.com/spc

Throttle check valve

Type Z2FS

Size 25

Component series 3X

Maximum operating pressure 350 bar [5076 psi]

Maximum flow 360 l/min [95 US gpm]

RE 27536/05.08

Replaces: 04.02

Table of contents Features

– Sandwich plate valve

– Porting pattern to ISO 4401-08-08-0-05 and

NFPA T3.5.1 R2-D08

– For limiting the flow of 2 actuator ports

–

Adjustment element: Spindle with hexagon socket

– For meter-in or meter-out throttling

Content Page

Features 1

Ordering code 2

Symbols 2

Function, section 3

Technical data 4

Characteristic curves 5

Unit dimensions 6

tb0222

2/8 Bosch Rexroth AG Hydraulics Z2FS RE 27536/05.08

Ordering code

Throttle check valve,

sandwich plate design

Size 25 = 22

Throttle check valve, sides A and B = –

Throttle check valve, side A = A

Throttle check valve, side B = B

Adjustment element

Spindle with hexagon socket = 8

Component series 30 to 39 = 3X

(30 to 39: unchanged installation and connection dimensions)

Further details in clear text

Seal material

No code = NBR seals

V = FKM seals

(other seals on request)

Attention!

Observe compatibility of seals with the

hydraulic fluid used

S = (…A8–3X/S) meter-in throttling on side A

(…B8–3X/S) meter-in throttling on side B

(…–8–3X/S) meter-in throttling on sides A and B

S2 = (…A8–3X/S2) meter-out throttling on side A

(…B8–3X/S2) meter-out throttling on side B

(…–8–3X/S2) meter-out throttling on sides A and B

Z2FS 22 8 3X

Symbols (① = component side, ② = plate side)

Meter-in throttling “S“ Meter-out throttling “S2“

Variant “–“

XTPAB

L Y

PAB

XTL Y

Variant “A“

PAB

XTL Y

PAB

XTL Y

Variant “B“

PAB

XTL Y

PAB

XTL Y

352.1 1 2.24

Hydraulics Bosch Rexroth AGRE 27536/05.08 Z2FS

3/8

Function, section

The hydraulic fluid returning from actuator B2 shifts throttle

spool (2.2) and thus provides an unhindered flow as with a

check valve. Depending on the variant (“S“ or “S2“) throttling

can be effective on the supply or return side.

Flow limitation

To change the velocity of an actuator, the throttle check valve

can be installed between the directional valve and the sub-

plate.

Valves of type Z2FS are throttle check valves of sandwich

plate design. They are used to limit the flow of one or two ac-

tuator ports.

Two throttle check valves, which are symmetrically arranged

to each other, limit the flow (by means of adjustable throttle

spools) in one direction and allow a free flow in the opposite

direction.

In the case of meter-in throttling the hydraulic fluid is fed

through channel A1 via throttling point (1) to actuator A2.

Throttle spool (2.1) can be axially adjusted by means of spin-

dle (3), thus allowing throttling point (1) to be adjusted.

At the same time, the hydraulic fluid present in channel A1

is fed via bore (4) to spool side (5). In addition to the spring

force, the applied pressure holds throttle spool (2.1) in the

throttling position.

Meter-in throttling

① = component side

② = plate side

4/8 Bosch Rexroth AG Hydraulics Z2FS RE 27536/05.08

Technical data (for applications outside these parameters, please consult us!)

General

Weight

kg [lbs] ca. 8 [17.6]

Installation orientation Optional

Ambient temperature range

°C [°F] –30 to +50 [–22 to +122] (NBR seals)

–20 to +50 [–4 to +122] (FKM seals)

Hydraulic

Maximum operating pressure

bar [psi] 350 [5076]

Maximum flow

l/min [US gpm]

360 [95]

Hydraulic fluid Mineral oil (HL, HLP) to DIN 51524

; fast bio-de-

gradable hydraulic fluids to VDMT 24568 (see also

RE 90221); HETG (rape seed oil)

; HEPG (polygly-

cols)

; HEES (synthetic esters)

; other hydraulic

fluids on 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

/s [SUS] 2.8 to 380 [13 to 1760]

Permissible max. degree of contamination of the

hydraulic fluid - cleanliness class to ISO 4406 (c)

Class 20/18/15

Suitable for NBR and FKM seals

Suitable for FKM seals only

The cleanliness classes specified for components must be

adhered to in hydraulic systems. Effective filtration prevents

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, RE 50087 and RE 50088.

[0]

[10]

[50]

[58]

[20]

[30]

[40]

[0]

[10] [20] [30]

24060 18030 120 15090 210 270 300

[40] [50] [60]

330 360

[95.1][70] [80] [90]

[0]

[2900]

[3626]

[72.5]

[145]

[2175]

[1450]

[14.5]

[0]

[10] [20] [30]

24060 18030 120 15090 210 270 300

[40] [50] [60]

330 360

[95.1][70] [80] [90]

100

150

200

250

[290]

[580]

[870]

[1160]

45 67 8

Hydraulics Bosch Rexroth AGRE 27536/05.08 Z2FS

5/8

∆p-q

characteristic curves (via check valve, with closed throttle)

Characteristic curves (measured with HLP46, ϑ

oil ( = 190 SUS)

= 40 °C ±5 °C [104 °F ± 9 °F])

Pressure differential in bar

[psi] →

Flow in l/min [US gpm] →

∆p-q

characteristic curves (constant throttling position)

Pressure differential in bar [psi] →

Flow in l/min [US gpm] →

Throttling position in turns

188

min 268

max 320

TPY

17,2

12,6

6 x 11

76,6

554

117

2 75 84 72

[12.50]

[10.55]

[7.40]

[4.61]

[3.02]

[2.17][0.16]

[Ø0.24]

[Ø0.433]

[0.68]

[0.50]

2 x 6,5

[Ø0.256]

9.1 9.21

min 245,3

[9.66]

max 271,3

[10.68]

max 271,3

[10.68]

min 245,3

[9.66]

0,01/100

[0.0004/4.0]

Rz1max 4

6/8 Bosch Rexroth AG Hydraulics Z2FS RE 27536/05.08

Unit dimensions (dimensions in mm [inch])

Required surface quality

of valve mounting face

1 Nameplate

2 Adjustment element “8“

Spindle for adjusting the flow cross-section (hexagon

socket 6 A/F)

• Turning counter-clockwise = greater flow

• Turning clockwise = smaller flow

3 Through-bores for valve mounting

4 Identical seal rings for ports A, B, P, T

5 Identical seal rings for ports X, Y, L

6 Locating pin (included in the scope of supply)

7 Hexagon 22 A/F, tightening torque M

= 25 Nm

[18.4 ft-lbs]

8 Porting pattern to ISO 4401-08-08-0-05 and

NFPA T3.5.1 R2-D08

9.1 Plug screw for variant “B“

9.2 Plug screw for variant “A“

Valve mounting screws (separate order)

– Metric

6 hexagon socket head cap screws

ISO 4762 - M12 - 10.9-flZn-240h-L

– UNC

6 hexagon socket head cap screws 5/8-11 UNC

Note!

The length and tightening torque of valve mounting screws

must be calculated taking account of the components mount-

ed above and below 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

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 verifica-

tion. It must be remembered that our products are subject to a natural

process of wear and aging.

Hydraulics Bosch Rexroth AGRE 27536/05.08 Z2FS

7/8

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

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 verifica-

tion. 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 27536/05.08

Notes