4WH6D5X/O SO135

Manufacturer: Bosch Rexroth

Material #: R978908621

Model : 4WH6D5X/O SO135

***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 4WH6D5X/O SO135 (R978908621) is a high-performance directional spool valve designed to control the start, stop, and direction of fluid flow in hydraulic systems. This particular model is part of the WH series of valves that are known for their robust construction, consisting of a durable housing, actuation elements such as a hydraulic actuation cylinder, a control spool, and return springs. The valve ports are radially positioned for ease of integration into various systems. This specific valve features a throttle insert which is essential when operational conditions may lead to flows during switching processes that could surpass the valve's performance limit. The throttle insert is placed in channel P to regulate these flows effectively. Moreover, the 4WH6D5X/O SO135 operates without spring return and includes a detent mechanism allowing each spool position to be securely locked, providing stability in various positions during operation. Additionally, the model is designed to be directly operated with hydraulic actuation and can be used as a spool position valve with detent. It comes without spring return in its default state which means there isn't a defined spool position when deenergized unless actuated otherwise. This feature allows for flexibility in control depending on system requirements. The Bosch Rexroth 4WH6D5X/O SO135 also adheres to international standards with porting patterns according to DIN form A without locating hole and ISO with locating hole, ensuring compatibility with various subplates which must be ordered separately. It can accommodate maximum operating pressures and flow rates specified by its component series X. For precise monitoring of the valve's position, it supports inductive position switches and proximity sensors that operate contactlessly for enhanced durability and reliability during operation.

$926.00 USD

More are expected on June 23, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as June 23, 2025 when ordered in

This product is eligible for factory repair.

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Direct operated directional spool valve Operating methods: Hydraulic Porting pattern according to DIN 24340 form A (without locating hole) Porting pattern according to ISO 4401-03-02-0-05 (with locating hole) Subplates see data sheet 45052 (separate order) Inductive position switch and proximity sensors (contactless)

General information

Valves of type WH are fluidically actuated directional spool valves. They control the start, stop and direction of a flow.

The directional valves basically consist of housing (1), one or two actuation elements (2) (hydraulic actuation cylinder), control spool (3) and one or two return springs (4). The ports for the control are positioned radially (5).

When de-energized, the control spool (3) is held in the central position or in the initial position by the return springs (4) (except impulse spool).

The control spool (3) is moved to the desired spool position by means of the actuation elements.

Throttle insert

The use of a throttle insert is required when due to prevailing operating conditions, flows can occur during the switching processes, which exceed the performance limit of the valve.

It is inserted in channel P of the directional valve.

Typ 4WH 6 E5X/...

Without spring return, with detent,

version ..OF/..

Directional valves with hydraulic actuation are also available as a 2-spool position valve with detent (7). If actuation elements with detent are used, each spool position can be locked.

Without spring return,

version ..O/..

If actuation elements without return springs and without detent are used, there is no defined spool position in the de-energized state.

Type 4WP 6 C6X/OF/N...

01	02	03	04	05	06	07		08	9	10	11		12	13	14	15	16
	W	H	no code	6		5X	/		J			/					*

01	3 main ports	3
01	4 main ports	4
02	Directional valve	W
Type of actuation
03	hydraulic	H
04	Ports radial	no code
05	Size 6	6
06	Spool symbol, e. g. C, E, EA, EB etc. 2)
07	Component series 50 … 59 (50 … 59: unchanged installation and connection dimensions)	5X
08	With spring return	no code
	Without spring return	O
	Without spring return with detent	OF
09	Improved corrosion protection 3)	J
10	Without manual override	no code
10	With manual override	N3)
Spool position monitoring 7)
11	Without position switch	no code
	Monitored spool position "a"	QMAG24
	Monitored spool position "b"	QMBG24
	Monitored rest position	QM0G24
12	Without throttle insert	no code
	Throttle Ø 0.8 mm	B086)
	Throttle Ø 1.0 mm	B106)
	Throttle Ø 1.2 mm	B126)
Seal material
13	NBR seals	no code
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
Clamping length
14	42 mm (standard)	no code
14	22 mm	Z
15	Without locating hole	no code
	With locating hole	/605)
	With locating hole and locking pin ISO 8752-3x8-St	/62
16	Further details in the plain text	*

Preferred types and standard units are specified in the EPS (standard price list).

	Switching positions
	2	3	Type WH
no code	●	●	●
O	●		●
OF	●		●
● = available

	1) Not with version “N”
	2) For symbols and example, see Symbols and Types of actuation
	3) The external parts made of metal are galvanized, treated with an anti-corrosion agent or made of stainless steel. This design is also suitable for on-wall applications.
	5) Locking pin ISO 8752-3 x 8-St, material no. R900005694, separate order
	6) Use if volume flow > performance limits of the valve, effective in channel P.
	7) Not for version “J”

general

Size			6
Weight (approx.)	Valve with one actuation cylinder	kg	2
Weight (approx.)	Valve with two actuation cylinders	kg	2.2
Installation position 1)			any
Ambient temperature range	NBR seals	°C	-30 … +80
Ambient temperature range	FKM seals	°C	-20 … +80

1)	With version ../O.. (A, C and D) : horizontal

hydraulic

Size			6
Maximum operating pressure	Port P	bar	315
	Port A	bar	315
	Port B	bar	315
	Port T 1)	bar	160
Maximum flow		l/min	60
Flow cross-section (spool position 0)	Symbol Q	mm2	approx. 6 % of nominal cross-section
Flow cross-section (spool position 0)	Symbol W	mm2	approx. 3 % of nominal cross-section
Minimum pilot pressure 2)		bar	6
Maximum pilot pressure		bar	200
Pilot volume		cm³	1.23
Hydraulic fluid			see table
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 3)			Class 20/18/15 according to ISO 4406 (c)
Maximum switching frequency		Hz	2

1)	With symbols A and B, port T must be used as leakage oil connection if the operating pressure exceeds the admissible tank pressure.
2)	6 ... 10 bar > tank pressure, performance limits dependent on the minimum pilot pressure, see chapter "Diagrams/characteristic curves", section "Performance limits"
3)	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.

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oil		HL, HLP	FKM, NBR	DIN 51524
Bio-degradable	Insoluble in water	HEES (synthetic esters)	FKM	VDMA 24568
	Insoluble in water	HETG (rape seed oil)	FKM, NBR	VDMA 24568
	Soluble in water	HEPG (polyglycols)	FKM	VDMA 24568
Other hydraulic fluids on request

Inductive position switch type QM: electrical connection

The electric connection is realized via a 4-pole mating connector (separate order) with connection thread M12 x 1.

electrical

Connection voltage (DC voltage)			V	24
Voltage tolerance (connection voltage)				+30 %/-15 %
Admissible residual ripple			%	≤ 10
Max. load capacity			mA	400
Switching outputs				PNP transistor outputs, load between switching outputs and GND
Pinout	1		V	24
	2, 4	Switching output	mA	400
	3	Earthing (GND)	V	0

For applications outside these parameters, please consult us!

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

Δp-qV characteristic curves

Symbol	Direction of flow
Symbol	P-A	P-B	A-T	B-T
A	3	3	–	–
B	3	3	–	–
C	1	1	3	1
D	5	5	3	3
E	3	3	1	1
F	1	3	1	1
G	6	6	9	9
H	2	4	2	2
J	1	1	2	1
L	3	3	4	9
M	2	4	3	3
P	3	1	1	1
Q	1	1	2	1
R	5	5	4	–
T	10	10	9	9
U	3	3	9	4
V	1	2	1	1
W	1	1	2	2
Y	5	5	3	3

Further characteristic curves:
7	Symbol “R” in switching position “b” (B → A)
8	Symbol “G” and “T” in central position (P → T)
9	Symbol “H” in central position (P → T)

Minimum pilot pressure dependent on the tank pressure

At a higher tank pressure, the minimum pilot pressure has to be increased according to this diagram.

Performance limits

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

Notice!

The switching function of the valves is independent from the filtration due to the adhesive effect. To achieve the specified admissible flow values, a full flow filtration with 25 μm is recommended. The flow forces acting within the valves also influence the flow performance.

With 4-way directional valves, the specified flow data are therefore valid for normal operation with 2 directions of flow (e. g. from P to A and simultaneous return flow from B to T).

If there is only one direction of flow, the admissible flow may be significantly lower in critical cases (e. g. if a 4-way directional valve is used as a 3-way directional valve due to blocked port A or B).

Pilot pressure 6 bar > tank pressure
Spring return	Characteristic curve	Symbol
“no code” (with spring return)	1	A, B
	2	C, D, Y
	3	E, J, L, U, M, Q, V, W, E1-
	4	F, P
	5	T
	6	G, H
	7	R
../O..	8	A, C, D
../OF..	8	A, C, D

Pilot pressure 10 bar > tank pressure
Spring return	Characteristic curve	Symbol
“no code” (with spring return)	1	A, B
	8	C, D, Y, E, G, H, J, L, U, M, Q, V, W, E1-
	9	F, P
	10	R
	11	T
../O..	8	A, C, D
../OF..	8	A, C, D

Attention!

Caution in conjunction with differential cylinders due to pressure intensification!

1)	Example: – Symbol E with spool position "a" → ordering code ..EA.. – Symbol E with spool position “b” → ordering code ..EB..
2)	Symbol E1-: P → A/B pre-opening

Ordering code			Type of actuation
Symbol	Actuation side	Spool return	Type of actuation
A, C, D
		../O..
		../OF..
B, Y
E, F G, H J, L M, P Q, R T, U V, W	a = A
	b = B

Dimensions in mm


Required surface quality of the valve contact surface

L1	L2	L3	L4	L5
mm	mm	mm	mm	mm
22.5	64.5	48	90	138

1	Valve with 2 spool positions and 2 actuation cylinders
1	Valve with 3 spool positions and 2 actuation cylinders
2	Actuation cylinder “a”
3	Actuation cylinder “b”
4	Cover for valve with 1 actuation cylinder (2 spool positions)
5	Same seal rings for ports A, B, P, T
6	Name plate
7	Porting pattern according toISO 4401-03-02-0-05 (with locating hole for locking pin ISO 8752-3x8-St, material no. R900005694, separate order)
8	Connection
9	Port with version “WHZ”
11	Alternative clamping length (): 22 mm

Subplates according to data sheet 45052 (separate order)

(without locating hole)

G 341/01 (G1/4)

G 342/01 (G3/8)

G 502/01 (G1/2)

(with locating hole)

G 341/60 (G1/4)

G 342/60 (G3/8)

G 502/60 (G1/2)

G 341/12 (SAE-6)1)

G 342/12 (SAE-8)1)

G 502/12 (SAE-10)1)

1) On request

Valve mounting screws (separate order)

Clamping length 42 mm:

4 hexagon socket head cap screws, metric

ISO 4762-M5 x 50-10.9-flZn-240h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 7 Nm ± 10 %,

material no. R913000064

4 hexagon socket head cap screws

ISO 4762-M5 x 50-10.9 (self procurement)

(friction coefficient μtotal = 0.12 to 0.17);

tightening torque MA = 8.1 Nm ± 10 %

4 hexagon socket head cap screws UNC

10-24 UNC x 2″ ASTM-A574

(friction coefficient μtotal = 0.19 to 0.24);

tightening torque MA = 11 Nm± 15 %,

(friction coefficient μtotal = 0.12 to 0.17);

tightening torque MA = 8 Nm ± 10 %,

material no. R978800693

Clamping length 22 mm:

4 hexagon socket head cap screws, metric

ISO 4762-M5 x 30-10.9-flZn-240h-L

(friction coefficient μtotal= 0.09 to 0.14);

tightening torque MA = 7 Nm ± 10 %,

material no. R913000316

4 hexagon socket head cap screws

ISO 4762-M5 x 30-10.9 (self procurement)

(friction coefficient μtotal = 0.12 to 0.17);

tightening torque MA = 8.1 Nm± 10 %

4 hexagon socket head cap screws UNC

10-24 UNC x 1 1/4 ″

(friction coefficient μtotal = 0.19 to 0.24);

tightening torque MA = 11 Nm± 15 %,

(friction coefficient μtotal = 0.12 to 0.17);

tightening torque MA = 8 Nm± 10 %,

material no. R978802879

Spool position monitoring

Inductive position switch type QM

Dimensions in mm

1)	For dimensions, see valve dimensions

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

4WH6D5X/O SO135

Manufacturer: Bosch Rexroth

Material #: R978908621

Model : 4WH6D5X/O SO135

More are expected on June 23, 2025

This product is eligible for factory repair.

Typ 4WH 6 E5X/...

general

hydraulic

Inductive position switch type QM: electrical connection

electrical

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

Δp-qV characteristic curves

Minimum pilot pressure dependent on the tank pressure

Performance limits

Spool position monitoring

Inductive position switch type QM

Notice:

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