M-3SED6CK1X/350CG24K72L

Manufacturer: Bosch Rexroth

Material #: R901255268

Model : M-3SED6CK1X/350CG24K72L

***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/350CG24K72L (R901255268) is a high-performance direct operated directional seat valve designed for controlling the start, stop, and direction of a fluid flow with solenoid actuation. It features a robust housing, a durable solenoid, and precision-engineered valve seats along with a closing element. This valve offers both normally open (UK) and normally closed (CK) configurations determined by the spring arrangement. The M-3SED6CK1X/350CG24K72L is pressure-compensated, ensuring stable operation regardless of external pressure fluctuations. The special closing element design allows ports P, A, and T to withstand maximum operating pressures and facilitates bidirectional flow capabilities. In its default position, the spring forces the closing element onto its seat to block flow; when activated by the solenoid, it shifts to allow fluid passage. This model also includes a manual override feature for non-electrical actuation and an internal closure of the tank port. Additionally, it can be combined with a Plus plate to mimic the functionality of a 3-directional seat valve. The Plus plate's unique design enables various operational modes including an initial position where port P is blocked while A is connected to T; a transition position that briefly connects P, A, and B; and a switching position that connects P to A while B is connected to T. For applications requiring controlled flow rates or in scenarios where excessive flows might occur during switching processes (like accumulator operation), this model can utilize throttle inserts in port P. Furthermore, it can accommodate check valve inserts for free flow from P to A while preventing backflow from A to P. This Bosch Rexroth valve offers various customization options such as rotatable wet-pin DC solenoids with detachable coils (AC voltage compatibility via rectifier), multiple electrical connection styles including individual connections, optional concealed manual overrides and contactless inductive position switches for enhanced functionality. The unit adheres to DIN form A porting patterns without locating holes and ISO patterns with locating holes for installation flexibility. It ensures safe switching even after extended periods under pressure. Key specifications include its size component series X with maximum operating pressure up to bar and maximum flow rate measured in liters per minute.

$828.00 USD

More are expected on April 7, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 7, 2025 when ordered in

This product is eligible for factory repair.

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Direct operated directional seat valve with solenoid actuation Porting pattern according to DIN 24340 form A (without locating hole) Porting pattern according to ISO 4401-03-02-0-05 (with locating hole) Safe switching also with longer standstill periods under pressure Wet-pin DC solenoids with detachable coil (AC voltage possible by means of a rectifier) Solenoid coil is rotatable by 90° The coil can be changed without having to open the pressure-tight chamber Electrical connection as individual connection With concealed manual override, optional Inductive position switch (contactless)

4/2 directional seat valve

2/2 and 3/2 directional seat valve

General

The directional valve of the type M-.SED is a direct operated directional seat valve with solenoid actuation. It controls the start, stop and direction of flow and mainly consists of a housing (1), the solenoid (2), the valve seats (7) and (11) as well as of the closing element (4).

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

Basic principle (3/2 directional seat valve)

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 closing element (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).

With the special closing element (4), 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 closing element (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.

With the 2/2 directional seat valve, the tank port is internally closed.

2/2 directional seat valve		3/3 directional seat valve
„PK“		„UK“
„NK“		„CK“

Type M-3SED 6 UK1X/350CG24N9K4 (top) / type M-3SED 6 CK1X/350CG24N9K4 (bottom)

4/2 directional seat valve

2/2 and 3/2 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 closing element (4) on the seat (11). Port P is blocked and A is connected to T. A 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). Thus, P is connected to B and A is connected to T.

Transition position:

Upon actuation of the main valve, the closing element (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. Since 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”.

Attention!

In order to avoid pressure intensification when using differential cylinders, the annulus area of the cylinder must be connected at A.

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

Type M-4SED 6 Y1X/350CG24N9K4

Throttle 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.

2/2 and 3/2 directional seat valve

The throttle insert is inserted into port P of the seat valve.

4/2 directional seat valve

The throttle insert is inserted into port P of the Plus-1 plate

Check valve insert

The check valve insert allows a free flow from P to A and closes A to P in a leak-free form.

2/2 and 3/2 directional seat valve

The check valve insert is inserted into port P of the seat valve.

4/2 directional seat valve

The check valve insert is inserted into port P of the Plus-1 plate.

01		02	03	04	05		06		07	08	09	10	11	12		13	14	15	16
M	–		SED	6		–	1X	/	350	C			K4		/				*

01	Mineral oil				M
02	2 main ports				2
	3 main ports				3
	4 main ports				4
03	Seat valve				SED
04	Size 6				6
05	Main ports	2	3	4
	Symbols	●	–	–	PK
		●	–	–	NK
		–	●	–	UK
		–	●	–	CK
		–	–	●	D
		–	–	●	Y
	● = available
06	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)				1X
07	Operating pressure up to 350 bar				350 bar
08	Solenoid, wet-pin, with detachable coil				C
09	Direct voltage 24 V				G24
	Nominal voltage 205 V at DC solenoid with operation with AC voltage mains (AC voltage mains 230 V – 50/60 Hz with an admissible voltage tolerance of +/- 10 %)				G2051)
	Nominal voltage 96 V at DC solenoid with operation with AC voltage mains (AC voltage mains 110 V/120 V - 50/60 Hz with an admissible voltage tolerance of +/- 10 %)				G96
	Further ordering codes for other voltages are provided in the technical data
10	With concealed manual override				N9
	Without manual override				no code
Electrical connection
11	Individual connection
	without mating connector, individual connection with connector according to DIN EN 175301-803				K4 2)
	With M12x1 plug-in connection, high-performance version 5-pole, integrated interference protection circuit, operating display with LED				K72L3)
Spool position monitoring
12	Without position switch				no code
	Monitored spool position "a"				QMAG24
	Monitored spool position "b"				QMBG24
13	Without check valve insert, without throttle insert				no code
	With check valve insert				P
	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
14	NBR seals				no code
	FKM seals (other seals upon request)				V
	Observe compatibility of seals with hydraulic fluid used.
15	Without locating hole				no code
	With locating hole and locking pin ISO 8752-3x8-St				/62
16	Further details in the plain text				*

	1) For the connection to the AC voltage mains, a DC solenoid must be used, which is controlled via a rectifier (see AC voltage mains table).
	A mating connector with integrated rectifier can be used (separate order).
	2) Mating connectors, separate order.
	3) Version “G24” only, see data sheet 12345

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

general

Size			6
Weight	2/2 directional seat valve	kg	1.5
	3/2 directional seat valve	kg	1.5
	4/3 directional seat valve	kg	2.3
Installation position			any
Ambient temperature range	NBR seals	°C	-30 … +50
Ambient temperature range	FKM seals	°C	-20 … +50

hydraulic

Size			6
Maximum operating pressure	Port P	bar	350
	Port A	bar	350
	Port B	bar	350
Maximum flow		l/min	25
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, cleanliness class according to ISO 4406 (c) 1)			Class 20/18/15 according to ISO 4406 (c)

1)	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

electrical

Voltage type			Direct voltage	AC voltage
Available voltages 1)		V	12 / 24 / 42 / 96 / 110 / 205 / 220	110 / 120 / 230
Voltage tolerance (nominal voltage)		%	± 10
Power consumption		W	30
Duty cycle		%	100
Switching time according to ISO 6403	ON	ms	40 … 70
	OFF (without rectifier)	ms	10 … 20
	OFF (with rectifier)	ms	30 … 45
Maximum switching frequency	Operating pressure ≤350 bar	1/h	15000
Maximum switching frequency	Operating pressure >350 bar	1/h	3600
Protection class according to DIN EN 60529			IP65 (with mating connector mounted and locked)
Maximum surface temperature of the coil 2)		°C	120

1)	Special voltages available upon request
2)	Due to the surface temperatures of the solenoid coils, the standards ISO 13732-1 and EN 982 need to be adhered to!

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

M12x1 plug-in connection

electrical

M12x1 plug-in connections 1)			K72L
Available voltages 2)		V	24
Limited switch-off voltage peak		V	-44 … -55
Voltage tolerance (nominal voltage)		%	± 10
Power consumption		W	30
Duty cycle		%	100
Switching time according to ISO 6403	ON	ms	40 … 70
	OFF (without rectifier)	ms	10 … 20
	OFF (with rectifier)	ms	30 … 45
Maximum switching frequency	Standard	1/h	15000
Protection class according to DIN EN 60529 3)			IP65
Protection class according to DIN EN 61140			III
Maximum coil temperature 4)		°C	150

1)	Mating connectors according to IEC 60947-5-2, separate order, see data sheet 08006
2)	Connection to functional low voltage with secure separation only = PELV/SELV
3)	Only with the use of the mating connectors indicated by us and with correct installation.
4)	Due to the surface temperatures of the solenoid coils, the standards ISO 13732-1 and EN 982 need to be adhered to!

In the electrical connection, the protective earthing conductor (PE, grounded) is to be connected in accordance with the stipulations.

For applications outside these parameters, please consult us!

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

Δp-qV characteristic curves, 2/2 and 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

Inductive position switch type QM Switching logics

Version QMA

(Position switch on side B, monitored spool position "a")

Version QMA

(Position switch on side A, monitored spool position "a")

Version QMB

(Position switch on side A, monitored spool position "b")

Performance limit: (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
2/2-way circuit (2/2 directional seat valve)	PK		350	350			25
2/2-way circuit (2/2 directional seat valve)	NK		350	350			25
2/2-way circuit (3/2 directional seat valve)	UK	With 2/2-way circuits, port P or T must be closed.	350	350		350	25
2/2-way circuit (3/2 directional seat valve)	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 – 40	25
	Y	3/2 directional valve (symbol "CK") in connection with Plus-1 plate: pP ≥ pA ≥ pB ≥ pT	350	350	350	pP – 40	25

Attention!

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

Version QMB

(Position switch on side B, monitored spool position "b")

M12x1 plug-in connection ‒ Individual connection – “K72L”

Pin 5 without function

2/2 directional seat valve (“PK”) and 3/2 directional seat valve (“UK”)

Dimensions in mm

2/2 directional seat valve (“PK”) and 3/2 directional seat valve (“UK”)

Dimensions in mm

1)	1) Depth of fit

1	Solenoid “a”
2.1	Dimension for valve with concealed manual override "N9"
2.2	Dimension for valve without manual override
3	Mating connector without circuitry (separate order)
4	Mating connector with circuitry (separate order)
5	Space required to remove the coil
6	Space required to remove the mating connector
7	Attention! With 2/2 and 3/2 directional seat valves, port B is present as blind counterbore. With 2/2 directional seat valves, port T is closed internally.
8	Name plate
9	Identical seal rings for ports A, B, and T; seal ring for port P
10	Porting pattern according to ISO 4401-03-02-0-05 (with locating hole for locking pin ISO 8752-3x8-St, material no. R900005694, included in the scope of delivery)

2/2 directional seat valve (“NK”) and 3/2 directional seat valve (“CK”)

Dimensions in mm

1)	1) Depth of fit

2/2 directional seat valve (“NK”) and 3/2 directional seat valve (“CK”)

Dimensions in mm

1	Solenoid “b”
2.1	Dimension for valve with concealed manual override "N9"
2.2	Dimension for valve without manual override
3	Mating connector without circuitry (separate order)
4	Mating connector with circuitry (separate order)
5	Space required to remove the coil
6	Space required to remove the mating connector
7	Attention! With 2/2 and 3/2 directional seat valves, port B is present as blind counterbore. With 2/2 directional seat valves, port T is closed internally.
8	Name plate
9	Identical seal rings for ports A, B, and T; seal ring for port P
10	Porting pattern according to ISO 4401-03-02-0-05 (with locating hole for locking pin ISO 8752-3x8-St, material no. R900005694, included in the scope of delivery)

4/2 directional seat valve (“D”)

Dimensions in mm

4/2 directional seat valve (“D”)

Dimensions in mm

1	Solenoid “a”
2.1	Dimension for valve with concealed manual override "N9"
2.2	Dimension for valve without manual override
3	Mating connector without circuitry (separate order)
4	Mating connector with circuitry (separate order)
5	Space required to remove the coil
6	Space required to remove the mating connector
7	Plus-1 plate
8	Name plate
9	Identical seal rings for ports A, B, and T; seal ring for port P
10	Porting pattern according to ISO 4401-03-02-0-05 (with locating hole for locking pin ISO 8752-3x8-St, material no. R900005694, included in the scope of delivery)

4/2 directional seat valve (“Y”)

Dimensions in mm

4/2 directional seat valve (“Y”)

Dimensions in mm

1	Solenoid “b”
2.1	Dimension for valve with concealed manual override "N9"
2.2	Dimension for valve without manual override
3	Mating connector without circuitry (separate order)
4	Mating connector with circuitry (separate order)
5	Space required to remove the coil
6	Space required to remove the mating connector
7	Plus-1 plate
8	Name plate
9	Identical seal rings for ports A, B, and T; seal ring for port P
10	Porting pattern according to ISO 4401-03-02-0-05 (with locating hole for locking pin ISO 8752-3x8-St, material no. R900005694, included in the scope of delivery)

2/2 and 3/2 directional seat valve

4 hexagon socket head cap screws, metric

ISO 4762 - M5 x 50 - 10.9-flZn-240h-L (separate order)

(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″ (self procurement)

(friction coefficient μtotal = 0.19 to 0.24 according to ASTM-574);

tightening torque MA = 11 Nm ± 15 %,

(friction coefficient μtotal = 0.12 to 0.17 according to ISO 4762);

tightening torque MA = 8 Nm ± 10 %,

material no. R978833365

4/2 directional seat valve

4 hexagon socket head cap screws metric

ISO 4762 - M5 x 95 - 10.9-flZn-240h-L (included in the scope of delivery)

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 7 Nm ± 10 %,

material no. R913000223

4 hexagon socket head cap screws

ISO 4762 - M5 x 95 - 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 3 3/4″ (self procurement)

(friction coefficient μtotal = 0.19 to 0.24 according to ASTM-574);

tightening torque MA = 11 Nm ± 15 %,

(friction coefficient μtotal = 0.12 to 0.17 according to ISO 4762);

tightening torque MA = 8 Nm ± 10 %,

material no. R978881682

Spool position monitoring

Dimensions in mm

1)	only NG150

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.

M12x1 plug-in connection

Dimensions in mm

M-.SED 6 .-1X/350CG24.K72L…

Dimensions in mm

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

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

In order to switch the valve safely and/or maintain it in its spool position, the pressure must be pP ≥ pA ≥ pT (for design reasons). Seat valves have a negative spool overlap, i.e. leakage oil occurs during the switching process. However, this process takes place within such a short time that it is irrelevant in nearly all cases of use. The indicated maximum flow must not be exceeded (if applicable, use a throttle insert for flow limitation)!

Plus-1 plate:

When using the Plus-1 plate (4/2 directional function), the following lower operating values are 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 arbitrarily exchanged or closed! With 3- and 4-way spool position, port T must always be connected. Observe the pressure level and pressure distribution! The flow is only admissible in the direction of arrow!

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z4

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z45

Mating connectors for valves with connector “K4”, without circuitry, standard

3P Z45

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

Mating connectors for valves with connector “K4”, with indicator light

3P Z5L

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with indicator light

3P Z55L

Mating connectors for valves with connector “K4”, with indicator light

3P Z55L

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

Mating connectors for valves with connector “K4”, with indicator light and Zener diode suppression circuit

3P Z5L1

For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector” Mating connectors for valves with one or two solenoids (individual connection)

Data sheet

Spare parts & repair

M-3SED6CK1X/350CG24K72L

Manufacturer: Bosch Rexroth

Material #: R901255268

Model : M-3SED6CK1X/350CG24K72L

More are expected on April 7, 2025

This product is eligible for factory repair.

4/2 directional seat valve

2/2 and 3/2 directional seat valve

Type M-3SED 6 UK1X/350CG24N9K4 (top) / type M-3SED 6 CK1X/350CG24N9K4 (bottom)

4/2 directional seat valve

2/2 and 3/2 directional seat valve

Throttle insert

Check valve insert

general

hydraulic

electrical

electrical

M12x1 plug-in connection

electrical

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

Δp-qV characteristic curves, 2/2 and 3/2 directional seat valve

Δp-qV characteristic curves, 2/2 and 3/2 directional seat valve

Δp-qV characteristic curves ‒ 4/2 directional seat valve

Δp-qV characteristic curves ‒ 4/2 directional seat valve

Δp-qV characteristic curves ‒ Check valve insert

Δp-qV characteristic curves ‒ Check valve insert

Δp-qV characteristic curves ‒ throttle insert

Δp-qV characteristic curves ‒ throttle insert

Inductive position switch type QM Switching logics

Version QMA

Version QMA

Version QMB

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

Version QMB

M12x1 plug-in connection ‒ Individual connection – “K72L”

2/2 directional seat valve (“PK”) and 3/2 directional seat valve (“UK”)

2/2 directional seat valve (“PK”) and 3/2 directional seat valve (“UK”)

2/2 directional seat valve (“NK”) and 3/2 directional seat valve (“CK”)

2/2 directional seat valve (“NK”) and 3/2 directional seat valve (“CK”)

4/2 directional seat valve (“D”)

4/2 directional seat valve (“D”)

4/2 directional seat valve (“Y”)

4/2 directional seat valve (“Y”)

Spool position monitoring

Inductive position switch type QM

Notice:

M12x1 plug-in connection

M-.SED 6 .-1X/350CG24.K72L…

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