SL6PB2-6X/

Manufacturer: Bosch Rexroth

Material #: R900590409

Model : SL6PB2-6X/

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth SL6PB2-6X (R900590409) is an advanced isolator valve designed for subplate mounting, delivering reliable performance in controlling hydraulic flow. This releasable check valve is engineered to enable leakage-free blocking of one actuator port, ensuring stability and safety even during extended periods of inactivity. The SL6PB2-6X features a robust construction that includes a housing, seat poppet, compression spring, and a control spool. An optional preopening as a ball seat valve enhances its functionality. This valve allows unidirectional flow from A to B without the need for external pilot pressure, provided that the pressure at port A exceeds that at port B. For reverse flow, the hydraulic tight closure is achieved through the seat valve mechanism. The application of sufficient pilot pressure at port X actuates the control spool which disengages the seat poppet allowing bidirectional flow by keeping the valve actively open. The SL6PB2-6X offers different configurations to suit various requirements: Version A includes a preopening feature that ensures secure unloading even under low pilot pressures and mitigates switching shocks through dampened decompression. Conversely, Version B operates without preopening and may result in sudden unloading pressure volumes leading to potential switching shocks and noise. Additionally, users can modify this type from SV to SL by simply exchanging plugs; it's mandatory that one of the two plugs remains installed at all times. The product adheres to ISO standards for porting patterns and provides options for various cracking pressures as well as check valve installation sets sold separately. Users can also opt for corrosion-resistant designs if required by their specific applications. The Bosch Rexroth SL6PB2-6X is an adaptable solution designed to meet diverse hydraulic system needs with precision and reliability.

$649.00 USD

Availability: 10 In Stock

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Qty: Delivered as early as January 2, 2025 when ordered in

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For subplate mounting Porting pattern according to ISO 4401-03-02-0-05 and ISO 5781-03-04-0-00 For the leakage-free blocking of one actuator port With external pilot oil return Various cracking pressures, optional With or without pre-opening, optional Check valve installation sets available individually Corrosion-resistant design, optional

The isolator valve type SV is a releasable check valve for subplate mounting. It is used for the leakage-free blocking of one actuator port, also in case of longer standstill times.

The valve basically consists of a housing (1), a seat poppet (2), a compression spring (3), a control spool (4) as well as of a pre-opening as ball seat valve (7), which is optional.

The seat valve can be flown through from direction A to B without external pilot pressure.

Condition: pA > pB + cracking pressure (compression spring). In the opposite direction, the seat valve closes hydraulically tight.

A sufficiently high pilot pressure at port X moves the control spool (4) in the direction of the seat valve and pushes the seat poppet (2) out of its seat. This allows for a free flow in both directions (active keeping open).

In order to ensure that the seat valve actively opens, the pressure ratios on both sides of the control spool (4) are just as important as the area ratios at the seat poppet (2) or (7).

This results in the following available options for the types

SV (large spool face A2 (6) connected to pA ) or

as well as for the versions with pre-opening "A" and without pre-opening "B".

Version "A" (with pre-opening)

This valve is provided with an additional pre-opening. By pressurization at port X, the control spool (4) is moved to the right. As a result, the ball (7) is pushed off the seat first and the seat poppet (2) afterwards.

Notes!

Version "A":

The two-stage set-up with an increased control open ratio means even low pilot pressure can be unloaded securely. Avoidance of switching shocks due to dampened decompression of the pressure volume on the actuator side.

Version "B":

In case of valves without pre-opening, the included pressure volume may be unloaded suddenly. Resulting switching shocks may lead to premature wear on installed components, as well as noise formation.

The modification of type SV to type SL is possible by exchange of plugs (9) and (10). One of the both plugs must always be installed!

Type SL 6 PB.‑6X/…

Type	Plug (9)	Plug (10)
SL	M3 (closed)	M6 x 1 (open)

01	02	03	04	05	06		07		08	09	10
S	L	6	P			–	6X	/			*

01		S
02	Pilot oil return, external	L
03	Size 6	6
04	For subplate mounting	P
05	With pre-opening	A
05	Without pre-opening	B
Cracking pressure
06	See characteristic curves	1
		2
		3
		4 1)
07	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions)	6X
Corrosion resistance (outside)
08	Without	no code
08	Galvanic coating DIN 50979 - Fe//Zn8//Cn//T0 (thick film passivation)	J50
Seal material 2)
09	NBR seals	no code
	FKM seals	V
	Other seals on request
10	Further details in the plain text	*

1) Only version "B"

2) The selection of the seal material depends on the operating parameters (fluid, temperature, etc.)

general

Size			6
Weight		kg	0.8
Installation position			any
Ambient temperature range	NBR seals	°C	-30 … +80
Ambient temperature range	FKM seals	°C	-20 … +80
MTTFD values according to EN ISO 13849		Years	150 1)

1)	For further details, see data sheet 08012

hydraulic

Size			6
Maximum operating pressure		bar	315
Cracking pressure 1)		bar	1.5 / 3 / 6 / 10
Maximum flow		l/min	60
Direction of flow			see symbols
Hydraulic fluid			see table
Minimum pilot pressure		bar	5
Maximum pilot pressure		bar	315
Hydraulic fluid temperature range (NBR seals)		°C	-30 … +80
Hydraulic fluid temperature range (FKM seals)		°C	-20 … +80
Viscosity range		mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid 2)			Class 20/18/15 according to ISO 4406 (c)
Pilot volume	Port X	cm³	0.68
Pilot volume	Port Y	cm³	0.58
Area ratio	Without pre-opening		A1/A2 ~ 1/3; A4/A2 ~ 1/7 (see sectional drawing)
Area ratio	With pre-opening		A3/A2 ~ 1/13 (see sectional drawing)

1)	in free direction
2)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

For applications outside these parameters, please consult us!

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oils and related hydrocarbons		HL, HLP, HVLP	NBR, FKM	DIN 51524
Environmentally compatible	Insoluble in water	HEES	NBR, FKM	ISO 15380
	Insoluble in water	HEPR	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU, HFDR	FKM	ISO 12922
Flame-resistant	Containing water	HFC	NBR	ISO 12922
Important information on hydraulic fluids! For further information and data on the use of other hydraulic fluids please contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)!

pA*	Type-dependent (for type SL: pA* = 0)
pSt	Pilot pressure
pA	Working pressure in A
pB	Working pressure in B
pF	Cracking pressure (spring)
A1 – A4	For areas, see sectional drawing and control area ratios

Δp-qV characteristic curves

Calculation of the pilot pressure pSt dependent on pA and pB

(measured with HLP46, ϑOil = 40 ±5 °C)

Version "A" (with pre-opening)

Balance of forces:

Assumption: pA = 0

Version "B" (without pre-opening)

Balance of forces:

Assumption: pA = 0

Pilot oil return, external

Dimensions in mm

	L in mm
Version	without pre-opening "B"	with pre-opening "A"
„1“ , „2“ , „3“	11	21,5
„4“	14	–

1	Port Y (M6 x 1; closed for type SV)
2	Name plate
3	Identical seal rings for ports A, B, P(X), (T)Y
4	Plug screw SW24 (pilot spool), tightening torque MA = 80+5 Nm
5	Plug screw SW22 (check valve uses), tightening torque MA = 25+5 Nm
6	Through hole for valve mounting screws
7	Porting pattern according to ISO 4401-03-02-0-05 and ISO 5781-03-04-0-00(with locating hole and locking pin ISO 8752-3x8-St)
8	Locking pin ISO 8752-3x8-St

Valve mounting screws (separate order)

4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9

(with friction coefficient μtotal = 0.14);

tightening torque MA = [si]8.9 Nm[/si][/imp]6.6 lb-ft[/imp] ± 10%

(please adjust in case of modified surfaces; use manual torque wrench!)