BOSCH REXROTH Check Valve, Pilot Operated Types Sv and Sl

1/8Check valve,pilot operated

Types SV and SL

Size 6Component series 6XMaximum operating pressure 315 barMaximum flow 60 l/min

RE 21460/07.05Replaces: 06.02

Table of contents Features

– For subplate mounting

– Position of ports to ISO 4401-03-02-0-94

– Subplates to data sheet RE 45052 (separate order)

– With internal or external pilot oil drain, optional

– 4 cracking pressures, optional

H6090

Contents Page

Features 1

Ordering code 2

Standard types 2

Symbols 2

Function, section 3

Technical data 4

Characteristic curves 5

Unit dimensions 6

Further standard types and components can be found in the EPS (standard price list).

2/8 Bosch Rexroth AG Hydraulics SV; SL RE 21460/07.05

Ordering code

Pilot oil drain internal = VPilot oil drain external = L

Size 6 = 6

For subplate mounting = P

Without pre-opening = B

Cracking pressure = 1See Δp-qV chatacteristic curves A to B, page 5 = 2 = 3 = 4

Further details in clear text

/62 = With locating bore and locating pin

ISO 8752-3x8-St

Seal materialNo code = NBR sealsV = FKM seals

Caution!Observe compatibility of seals with hydraulic

fluid used!

6X = Component series 60 to 69 (60 to 69: unchanged installation and

connection dimensions)

Standard types

Type Material no.

SL 6 PB1-6X/ R900491117

SV 6 PB1-6X/ R900494086

Symbols

Version SV (pilot oil drain internal) Version SL (pilot oil drain external)

A X

B

A X

B

Y

S 6 P B 6X 62 *

Y (T)A B

6 4 7 15 2 3

Y (T)

A

B

X (P)

Hydraulics Bosch Rexroth AGRE 21460/07.05 SV; SL 3/8

Function, section

Valves of types SV and SL are pilot operated check valves of poppet design that can be opened in the checked direction.

These valves are used to isolate pressurised working circuits, to prevent a load from lowering in the event of a pipe rupture or to protect hydraulically isolated actuators from creeping down.

These valves basically consist of housing (1), poppet (2), com-pression spring (3) and pilot piston (4).

Type SV…

The valve allows free flow from A to B; in the opposite direc-tion, poppet (2) is held seated by the spring force and addition-ally by the system pressure.

When pressure is applied in port X, control spool (4) is moved to the right. This pushes poppet (2) off its seat, and the annu-lus area of pilot piston (4) is connected with port A. The fluid can now also flow from B to A in the valve.

To ensure reliable opening of the valve via pilot piston (4), a certain, minimum pilot pressure is required (see page 5). Port Y is closed.

Type SL...

The operating principle of this valve corresponds to that of valve type SV.

The difference is external port Y. Here, the annulus area of pilot piston (4) is separated from port A. The pressure in A only acts on area A3 (7) of the pilot piston (4).

Type SV 6 PB.–6X/… SL 6 PB.–6X/…

5 Area A1

6 Area A2

7 Area A3


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

1) Suitable for NBR and FKM seals2) Suitable for FKM seals only3) 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 and RE 50088.

GeneralWeight kg approx. 0.8

Installation orientation Optional

Ambient temperature range °C –30 to +80 (NBR seals)–20 to +80 (FKM seals)

HydraulicMaximum operating pressure bar 315

Maximum flow l/min 60

Pilot pressure bar 5 to 315

Hydraulic fluid °C Mineral oil (HL, HLP) to DIN 51524 1); fast bio-degradable hydraulic fluids to VDMA 24568 (see also RE 90221); HETG (rape seed oil) 1); HEPG (polyglycols) 2); HEES (synthetic esters) 2); other hydraulic fluids on enquiry

Hydraulic fluid temperature range –30 to +80 (NBR seals)–20 to +80 (FKM seals)

Viscosity range mm2/s 2,8 to 500

Max. permissible degree of contamination of the hy-draulic fluid - cleanliness class to ISO 4406 (c)

Class 20/18/15 3)

Direction of flow Free from A to B, from B to A when pilot operated

Pilot flow – Port X cm3 0.68

– Port Y (type SL only) cm3 0.58

Control areas

(areas according to sectional drawing, see page 3)

– Area A1 cm2 0.42

– Area A2 cm2 1.33

– Area A3 cm2 0.19

0 602010 4030

12

10

8

6

4

2

0

50

14

16

18

4

1

3

2

1

2

3

0 60 120 180 240 300

100

80

40

20

330315

0

60

120


Characteristic curves (measured with HLP46, ϑoil = 40 °C ± 5 °C)

Flow in l/min →

Pre

ssur

e di

ffere

ntia

l in

bar →

Δp-qV characteristic curves

Load pressure in bar →

Pilo

t pre

ssur

e in

bar

→

Pilot pressure/load pressure characteristic curves

Cracking pressure:

1 1.5 bar

2 3 bar

3 7 bar

4 10 bar

1 Spread

2 Limit value

3 Valve poppet

A to B

B to A

A B

1,4

Ø12,2

A

B

X (P)

9,1 53,5

22,5

26

Y (T)44

4 x Ø5,4

2

1

3

6

45

23,5

42

7

F1 F2

F3F4 G

13

6,5

SW24 SW22 8

4

0,01/100mm

Rz1max 4


Unit dimensions (nominal dimensions in mm)

1 Port Y for valve type "SL" (on valve type "SV", this port is plugged)

2 Nameplate

3 Identical seal rings for ports A, B, X, Y

4 Dimension for valve with cracking pressure version "1", "2", "3"

5 Dimension for valve with cracking pressure version "4"

6 Through bore for valve fixing screws

7 Position of ports to ISO 4401-03-02-0-94(with locating bore and locating pin ISO 8752-3x8-St)

8 Locating pin ISO 8752-3x8-St

Subplates

G 341/01 (G1/4)G 342/01 (G3/8)G 502/01 (G1/2)

to data sheet RE 45052 (separate order)

Valve fixing screws (separate order)

4 socket head cap screws ISO 4762 - M5 x 50 - 10.9(friction coefficient µtotal = 0.14);tightening torque MT = 8.9 Nm ± 10%(please adapt in the case of changed surfaces)

Required surface quality of mating part


Notes

Bosch Rexroth AGHydraulicsZum Eisengießer 197816 Lohr am Main, GermanyPhone +49 (0) 93 52 / 18-0Fax +49 (0) 93 52 / 18-23 [email protected]

© 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 state-ments concerning a certain condition or suitability for a certain application can be derived from our information. The information given does notrelease 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

Documents

BOSCH REXROTH Check Valve, Pilot Operated Types Sv and Sl