M-3SED6CK1X/350CG24N9XNK4/B15V

Manufacturer: Bosch Rexroth

Material #: R901271235

Model : M-3SED6CK1X/350CG24N9XNK4/B15V

***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 M-3SED6CK1X/350CG24N9XNK4/B15V (R901271235) is a high-performance directional seat valve designed for controlling the start, stop, and direction of flow in hydraulic systems. This direct operated valve features solenoid actuation and includes a manual override for switching without solenoid energization. Its construction consists of a durable housing, solenoids, valve seats, and a control spool. The initial position of the valve can be either normally open (UK) or normally closed (CK), determined by the spring arrangement, ensuring pressure compensation against actuating forces. The M-3SED6CK1X/350CG24N9XNK4/B15V is capable of handling maximum operating pressures up to 350 bar and maximum flow rates up to specified limits. The valve's performance can be enhanced with the addition of a throttle insert when operating conditions induce flows that exceed its performance limit during switching processes. This model also offers versatility through the use of a Plus plate beneath the valve which enables additional functionality akin to a 3-way version directional seat valve. It ensures safe switching even after extended periods under pressure and features wet-pin DC solenoids with rotatable coils for flexible electrical connections. The manual override option provides added control convenience. Designed with safety in mind, this Bosch Rexroth directional seat valve complies with Explosion Protection Directive EU standards (IIG; IID) and technical rules EAC/TRCU (IIG; IID). The solenoid type protection adheres to EN standards ExecIICTGc and ExtcIIICTCDc for reliable operation in sensitive environments. With its robust design and precise control capabilities, this valve is an essential component for advanced hydraulic systems requiring dependable performance and safety compliance.

$1,657.00 USD

More are expected on April 24, 2025

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Qty: Delivered as early as April 24, 2025 when ordered in

This product is eligible for factory repair.

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3/2- or 4/2-way version Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole) Wet-pin DC solenoids Safe switching also with longer standstill periods under pressure Solenoid coil can be rotated by 90° Electrical connection with individual connection With manual override, optional

3/2 directional seat valve

General information

Directional valves of the type SED are direct operated directional seat valves with solenoid actuation. They control start, stop and direction of flow.

Directional valves basically comprise the housing (1), the solenoid (2), the valve seats (7) and (11) and the control spool (4).

The manual override (6) allows for the switching of the valve without solenoid energization.

Basic principle

The initial position of the valve (normally open "UK" or normally closed "CK") is determined by the arrangement of the spring (5). The chamber (3) behind the control spool (4) is connected to port P and sealed against port T. Thus, the valve is pressure-compensated in relation to the actuating forces (solenoid and spring).

By means of the control spool (4), the ports P, A and T can be loaded with the maximum operating pressure (350 bar) and the flow can be directed into both directions (see symbols).

In the initial position, the control spool (4) is pressed onto the seat (11) by the spring (5), in spool position, it is pressed onto the seat (7) by the solenoid (2). The flow is blocked.

Seat valves can be used according to the symbols and the related operating pressures and flows (see "Performance limits").

Type M-3SED 6 UK...
Type M-3SED 6 CK...

Throttle insert "...B"

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

1)	Seal ring

4/2 directional seat valve

With a sandwich plate, the Plus-1 plate, under the 3/2 directional seat valve, the function of a 4/2 directional seat valve is achieved.

Function of the Plus-1 plate:

Initial position:

The main valve is not operated. The spring (5) holds the control spool (4) on the seat (11). Port P is blocked and A is connected to T. Apart from that, one control line is connected from A to the large area of the control spool (8), which is thus unloaded to the tank. The pressure applied via P now pushes the ball (9) onto the seat (10). Now, P is connected to B, and A to T.

Transition position:

Upon actuation of the main valve, the control spool (4) is shifted against the spring (5) and pressed onto the seat (7). During this, port T is blocked, while P, A, and B are briefly connected to each other.

Switching position:

P is connected to A. As the pump pressure acts via A on the large area of the control spool (8), the ball (9) is pressed onto the seat (12). Thus, B is connected to T, and P to A. The ball (9) in the Plus-1 plate has a “positive spool overlap”.

Notice:

If the annulus area of differential cylinders is not connected to port A, a pressure peak is created in port B during the switching process. This pressure peak may exceed the maximum admissible operating pressure over the permissible limit.

The use of the Plus-1 plate and the seat arrangement offer the following options:
Symbol	D	Y

Type M-4SED 6 Y…

Schematic illustration: Initial position

1)	3/2 directional seat valve
2)	Plus-1 plate

Throttle insert, check valve insert

Throttle insert	Check valve insert
The use of a throttle insert is required if, due to prevailing operating conditions, flows which exceed the performance limit of the valve can occur during the switching processes. Examples: - Accumulator operation - Use as pilot control valve with internal pilot fluid tapping.	The check valve insert allows a free flow from P to A and closes A to P.

01		02	03	04	05	06		07	08	09	10	11	12		13	14
M	–		SED	6		1X	/	350	C	G24		XN	K4	/

01	Mineral oil			M
02	3 main ports			3
	4 main ports			4
03	Seat valve			SED
04	Size 6			6
Symbols
05	Main ports	3	4
		✔	–	UK
		✔	–	CK
		–	✔	D
		–	✔	Y
06	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)			1X
07	Operating pressure up to 350 bar			350
08	Wet-pin solenoid with detachable coil			C
Voltage
09	Direct voltage 24 V			G24
10	With concealed manual override			N9
	Without manual override			no code
Explosion protection
11	"Not igniting", for details, please refer to the "information on explosion protection"			XN
Electrical connection
12	Individual connection
	Solenoid without mating connector, see "Electrical connection"			K4
Throttle insert
13	Without check valve insert, without throttle insert			no code
	Throttle Ø 1.2 mm			B12
	Throttle Ø 1.5 mm			B15
	Throttle Ø 1.8 mm			B18
	Throttle Ø 2.0 mm			B20
	Throttle Ø 2.2 mm			B22
Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")
14	NBR seals			no code
	FKM seals			V
Notice: Representation of the symbols according to DIN ISO 1219-1.

For applications outside these parameters, please consult us!

general

Size			6
Installation position			any
Ambient temperature range 1)		°C	-20 … +50
Storage temperature range		°C	+5 … +40
Maximum storage time		yrs	1
Weight	3/2 directional seat valve	kg	2.2
Weight	4/2 directional seat valve	kg	3.2
Surface protection			Galvanized

1)	Maximum 40 °C when using the cable sets DS2513.

hydraulic

Size			6
Maximum operating pressure	Port P	bar	350
	Port A	bar	350
	Port B	bar	350
	Port T		See performance limits
Maximum flow		l/min	25
Hydraulic fluid			see table "Hydraulic fluid"
Hydraulic fluid temperature range 1)	NBR seals	°C	-20 … +80
Hydraulic fluid temperature range 1)	FKM seals	°C	-15 … +80
Viscosity range		mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 2)			Class 20/18/15

1)	Observe the "Special application conditions for safe application"
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.

Hydraulic fluid		Classification	Suitable sealing materials	Standards	Data sheet
Mineral oils		HL, HLP, HLPD	NBR, FKM	DIN 51524	90220
Bio-degradable	Insoluble in water	HETG	NBR, FKM	ISO 15380	90221
		HEES	FKM
	Soluble in water	HEPG	FKM	ISO 15380
Important information on hydraulic fluids: For more information and data on the use of other hydraulicfluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). Ignition temperature > 190 °C

electrical

Voltage type		Direct voltage
Available voltages	V	24
Voltage tolerance (nominal voltage)	%	± 10
Admissible residual ripple	%	< 5
Duty cycle/operating mode according to VDE 0580		S1 (continuous operation)
Rated current	mA	950
Switching time according to ISO 6403		see table
Maximum switch-off voltage peaks Solenoid 1)	V	500
Maximum switching frequency	Hz	1
Nominal power with ambient temperature 20 °C	W	23
Maximum power with 1.1 x nominal voltage and an ambient temperature of 20 °C	W	28.8
Protection class according to DIN EN 60529 2)		IP65

1)	Suitable damping by user required
2)	If a suitable mating connector and a correctly mounted electric connection are used.

Information on explosion protection – Directive 2014/34/EU

Area of application			II 3G	II 3D	II 3G	II 3D
Type of protection valve			c (EN 13463-5)
Type of protection valve solenoid according to EN 60079-7 / EN 60079-31			Ex ec IIC T3 Gc	Ex tc IIIC T140°C Dc	Ex ec IIC T3 Gc	Ex tc IIIC T140°C Dc
Maximum surface temperature 1)		°C	140
Temperature class			T3
Type examination certificate solenoid			BVS 12 ATEX E 062 X
Requirements on the mating connector	Temperature rating 2)	°C	≥ 100
	Area of application according to directive 2014/34/EU		II 3G	II 3D	II 3G	II 3D
	Protection class in plugged condition 3)		IP65

1)	Surface temperature > 50 °C, provide contact protection.
2)	Transfer temperature at the connector of the valve solenoid 85 °C at ambient temperature 40 °C.
3)	If a suitable mating connector and a correctly mounted electric connection are used.

Information on explosion protection – Technical rules EAC TR CU 012/2011

Area of application		II 3G	II 3D	II 3G	II 3D
Type of protection marking of valve		2Ex nA II T3 Gc X	Ex tc IIIC T140°C Dc X	2Ex nA II T3 Gc X	Ex tc IIIC T140°C Dc X
Maximum surface temperature 1)	°C	140
Temperature class		T3
Certificate of conformity		No TC RU C-DE.ГБ08.В.02161

1)	Surface temperature > 50 °C, provide contact protection.

Special application conditions for safe application

Connection lines must be passed in a pull-relieved way. The valve is to be installed in a way that no impact stress > 4 J can become effective. In order to avoid dangers caused by static charge, the base and/or subplate on which the valve is to be fitted must be electrically conductive and included in the equipotential bonding. The valve must not be installed close to charge generating processes. Dust layers with a thickness of > 50 mm are inadmissible. Maximum hydraulic fluid temperature:
In case of bank assembly, as long as only one solenoid is energized at a time and in case of individual assembly: +80 °C
In case of bank assembly, if more than one solenoids are energized simultaneously: +65 °C The maximum temperature of the surface of the valve jacket is 110 °C. This has to be considered when selecting the connection cable and/or contact of the connection cable with the surface of the jacket is to be prevented.

Switching times (installation position: solenoid horizontal)

Pressure p	Flow qV	Switching times t in ms
		tON without tank pressure				tOFF
		UK	CK	D	Y	CK, UK	D, Y
70 bar	25 l/min	40	45	45	50	10	10
140 bar	25 l/min	45	45	50	50	10	15
210 bar	25 l/min	50	45	55	50	15	20
280 bar	25 l/min	55	50	60	55	20	20
315 bar	25 l/min	60	50	65	55	20	20
350 bar	25 l/min	70	50	75	55	20	25
Notice: The switching times were determined at a hydraulic fluid temperature of 40 °C and a viscosity of 46 mm2/s. Deviating hydraulic fluid temperatures can result in different switching times. Switching times change dependent on operating time and application conditions.

Performance limits (measured with HLP46, ϑoil = 40 ±5 °C)

	Symbol	Comment	Operating pressure in bar				Flow in l/min
	Symbol	Comment	P	A	B	T	Flow in l/min
2-way circuit	UK	With 2/2-way circuits, port P or T must be closed.	350	350	‒	350	25
2-way circuit	CK	With 2/2-way circuits, port P or T must be closed.	350	350	‒	350	25
3-way circuit	UK		350	350	‒	350	25
3-way circuit	CK		350	350	‒	350	25
4-way circuit (flow only possible in the direction of arrow)	D	3/2 directional valve (symbol "UK") in connection with Plus-1 plate: pP ≥ pA ≥ pB ≥ pT	350	350	350	pP/pA/pB-40	25
	Y	3/2 directional valve (symbol "CK") in connection with Plus-1 plate: pP ≥ pA ≥ pB ≥ pT	350	350	350	pP/pA/pB-40	25

Notice:

The performance limits were determined when the solenoids were at operating temperature, at 10 % undervoltage and without tank preloading.

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

Δp-qV characteristic curves

3/2 directional seat valve

Δp-qV characteristic curves

4/2 directional seat valve

Δp-qV characteristic curves

Check valve insert

Δp-qV characteristic curves

Throttle insert

The type-examination tested valve solenoid of the valve is equipped with an electrical connection according to the following table. The electrical connection of the solenoid is polarity-independent.

Electrical connections and coil connection combinations

Ordering code connector		Top view	Circuit diagram	Pin	Connections, assignment
3-pole connector (2+PE) according to DIN EN 175301-803	K4			1	Solenoid coil, polarity-independent
				2
					Earthing

1)	M3, max. tightening torque MA max = 1 Nm

Over-current fuse and switch-off voltage peaks

Voltage data in the valve type code	Nominal voltage valve solenoid	Rated current valve solenoid	Recommended pre-fuse characteristics medium time-lag according to DIN EN 60127-1
G24	24 V DC	0.95 A DC	1 A

Notice:

A fuse which corresponds to the rated current according to DIN 41571 and EN / IEC 60127 has to be connected upstream of every valve solenoid (max. 3 x Irated).

The shut-off threshold of the fuse has to match the prospective short-circuit current of the supply source.

The prospective short-circuit current of the supply source may amount to a maximum of 1500 A.

This fuse may only be installed outside the potentially explosive atmosphere or must be of an explosion-proof design.

When inductivities are switched off, voltage peaks result which may cause faults in the connected control electronics.

The voltage peak must be damped by a suitable external circuitry. We recommend a circuitry with a suppressor diode with a limitation voltage of approx. 50 V.

3/2 directional seat valve – version “UK"

Dimensions in mm


Required surface quality of the valve contact surface

1	Solenoid coil
2	Concealed manual override “N9”
3	Mounting nut with double edge SW32
4	Space required to remove the solenoid coil
5	Plug-in connector according to EN 175301-803, design A (Cable sets, separate order, see "Accessories")
6	Identical seal rings for ports A, B, T; seal ring for port P
7	Name plate
8	Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
9	Port B is designed as blind counterbore
10	Name plate sticker

3/2 directional seat valve – version "CK"

Dimensions in mm


Required surface quality of the valve contact surface

1	Solenoid coil
2	Concealed manual override “N9”
3	Mounting nut with double edge SW32
4	Space required to remove the solenoid coil
5	Plug-in connector according to EN 175301-803, design A (Cable sets, separate order, see "Accessories")
6	Identical seal rings for ports A, B, T; seal ring for port P
7	Name plate
8	Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
9	Port B is designed as blind counterbore

4/2 directional seat valve – version “D”

Dimensions in mm


Required surface quality of the valve contact surface

1	Solenoid coil
2	Concealed manual override “N9”
3	Mounting nut with double edge SW32
4	Space required to remove the solenoid coil
5	Plug-in connector according to EN 175301-803, design A (Cable sets, separate order, see "Accessories")
6	Identical seal rings for ports A, B, T; seal ring for port P
7	Name plate
8	Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
9	Plus-1 plate
10	Name plate sticker
11	Valve mounting screws

4/2 directional seat valve, version “Y”

Dimensions in mm


Required surface quality of the valve contact surface

1	Solenoid coil
2	Concealed manual override “N9”
3	Mounting nut with double edge SW32
4	Space required to remove the solenoid coil
5	Plug-in connector according to EN 175301-803, design A (Cable sets, separate order, see "Accessories")
6	Identical seal rings for ports A, B, T; seal ring for port P
7	Name plate
8	Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
9	Plus-1 plate
10	Name plate sticker
11	Valve mounting screws

Valve mounting screws (separate order)

Version	Quantity	Hexagon socket head cap screws	Material number
"CK", "UK"	4	ISO 4762 - M5 x 50 - 10.9 (Friction coefficient μtotal = 0.09 … 0.14)	R913043758
"D", "Y"	4	ISO 4762 - M5 x 95 - 10.9 (Friction coefficient μtotal = 0.09 … 0.14)	R913051579
Notice: For reasons of stability, exclusively these valve mounting screws are to be used.

Subplates (separate order) with porting pattern according to ISO 4401-03-02-0-05, see data sheet 45100.

Notices:

Subplates are no components in the sense of directive 2014/34/EU and can be used after the manufacturer of the overall system has conducted an assessment of the risk of ignition. The "G...J3" versions are free from aluminum and/or magnesium and galvanized. The dimensions are nominal dimensions which are subject to tolerances.

Installation conditions

(Dimensions in mm)

	Individual assembly	Bank assembly
Subplate dimensions	Minimum dimensions: Length ≥ 64, width ≥ 58, height ≥ 25	Minimum cross-section: Height ≥ 60, width ≥ 85
Thermal conductivity of the subplate (EN-GJS-500-7)	≥ 38 W/mK
Minimum distance between the longitudinal valve axes	≥ 55

Notice:

With respect to the hydraulic fluid temperature, please observe the “Special conditions for safe use” in chapter "Technical data".

Seat valves can be used according to the spool symbols as well as the assigned operating pressures and flows (see "Performance limits").

In order to ensure safe functioning, it is absolutely necessary to observe the following:

Seat valves have a negative spool overlap, i.e. during the switching process, there is leakage oil. This process takes, however, place within such a short time that it is irrelevant in nearly all applications. The specified maximum flow must not be exceeded (use a throttle insert for flow limitation, if necessary).

4 main ports:

The following lower operating values have to be observed:
pmin = 8 bar, qV > 3 l/min. The ports P, A, B and T are clearly specified according to their tasks. They must not be exchanged or closed. Port T must always be connected. Observe the pressure level and pressure distribution. The flow is only permitted in the direction of arrow.

Spare parts & repair

M-3SED6CK1X/350CG24N9XNK4/B15V

Manufacturer: Bosch Rexroth

Material #: R901271235

Model : M-3SED6CK1X/350CG24N9XNK4/B15V

More are expected on April 24, 2025

This product is eligible for factory repair.

3/2 directional seat valve

Type M-3SED 6 UK... Type M-3SED 6 CK...

Throttle insert "...B"

4/2 directional seat valve

Type M-4SED 6 Y…

Schematic illustration: Initial position

Throttle insert, check valve insert

general

hydraulic

electrical

Information on explosion protection – Directive 2014/34/EU

Information on explosion protection – Technical rules EAC TR CU 012/2011

Special application conditions for safe application

Switching times (installation position: solenoid horizontal)

Performance limits (measured with HLP46, ϑoil = 40 ±5 °C)

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

Δp-qV characteristic curves

Δp-qV characteristic curves

Δp-qV characteristic curves

Δp-qV characteristic curves

Electrical connections and coil connection combinations

Over-current fuse and switch-off voltage peaks

3/2 directional seat valve – version “UK"

3/2 directional seat valve – version "CK"

4/2 directional seat valve – version “D”

4/2 directional seat valve, version “Y”

Valve mounting screws (separate order)

Installation conditions

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Information

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Type M-3SED 6 UK...
Type M-3SED 6 CK...