POPPET DIRECTIONAL VALVE M-2SED6NK1X/350CG24N9K4/B12
Manufacturer: Bosch Rexroth
Material #: R901408860
Model : M-2SED6NK1X/350CG24N9K4/B12
***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-2SED6NK1X/350CG24N9K4/B12 (R901408860) is a highly sophisticated industrial hydraulic valve designed for precise control of oil flow direction within hydraulic systems. This direct-actuated directional seat valve features solenoid actuation and is equipped with a concealed manual override, an auxiliary actuation mechanism, and a throttle insert nozzle of 0. mm in channel P. It belongs to component series X, indicating its advanced design and capabilities.
With the model code M-2SED6NK1X/350CG24N9K4/B12, this Bosch Rexroth valve is characterized by its spool symbol NK, which denotes its function as both a 2-way and 3-way directional seat valve. It can withstand a maximum pressure of up to bar and operates with an electrical connection that conforms to EN standards, specifically featuring a connector pole + PE configuration.
This valve has multiple ports for comprehensive fluid control and utilizes solenoid actuation for reliable operation. The size of this valve allows for subplate mounting with connection diagrams compliant with both NFPA T.. R D Size CETOP D and ISO standards. It requires a supply voltage of VDC to function effectively.
The maximum flow rate through this Bosch Rexroth hydraulic valve is l/min, making it suitable for various applications where precise fluid control is essential. The seals are made from NBR material, ensuring compatibility with hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, and HFC.
This model also includes features like wet-pin DC solenoids with detachable coils that can be rotated by degrees. The solenoid coil can be replaced without opening the pressure-tight chamber—a significant advantage in maintenance scenarios. Additionally, it offers the option for an inductive position switch for contactless detection of the valve's position.
In summary, the Bosch Rexroth M-2SED6NK1X/350CG24N9K4/B12 (R901408860) stands out as a versatile and reliable solution for controlling the direction of oil flow in high-performance industrial hydraulic systems.
$779.00 USD
More are expected on October 2, 2025
Note: Sales tax, shipping, and applicable tariffs will be calculated at checkout.Status: This product is temporarily out of stock.
Qty: Delivered as early as October 2, 2025 when ordered in
This product is eligible for factory repair.
Size 6, symbol NK, electrical with solenoid, 24 V DC
Industrial hydraulic valve in a high performance range, reliable switch of oil flow direction according to hydraulic symbol
Unpacked Weight: 1.420 kg
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.
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2/2 directional seat valve |
3/3 directional seat valve |
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„PK“ |
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„UK“ |
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„NK“ |
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„CK“ |
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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.
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The use of the Plus-1 plate and the seat arrangement offer the following options: |
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Symbol “D” |
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Symbol “Y” |
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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.
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01 |
02 |
03 |
04 |
05 |
06 |
07 |
08 |
09 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
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M |
– |
SED |
6 |
– |
1X |
/ |
350 |
C |
K4 |
/ |
* |
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01 |
Mineral oil |
M |
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02 |
2 main ports |
2 |
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3 main ports |
3 |
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4 main ports |
4 |
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03 |
Seat valve |
SED |
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04 |
Size 6 |
6 |
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05 |
Main ports |
2 |
3 |
4 |
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Symbols |
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● |
– |
– |
PK |
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● |
– |
– |
NK |
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– |
● |
– |
UK |
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– |
● |
– |
CK |
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– |
– |
● |
D |
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– |
– |
● |
Y |
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● = available |
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06 |
Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) |
1X |
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07 |
Operating pressure up to 350 bar |
350 bar |
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08 |
Solenoid, wet-pin, with detachable coil |
C |
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09 |
Direct voltage 24 V |
G24 |
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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) |
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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 |
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Further ordering codes for other voltages are provided in the technical data |
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10 |
With concealed manual override |
N9 |
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Without manual override |
no code |
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Electrical connection |
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11 |
Individual connection |
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without mating connector, individual connection with connector according to DIN EN 175301-803 |
K4 2) |
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With M12x1 plug-in connection, high-performance version 5-pole, integrated interference protection circuit, operating display with LED |
K72L3) |
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Spool position monitoring |
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12 |
Without position switch |
no code |
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Monitored spool position "a" |
QMAG24 |
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Monitored spool position "b" |
QMBG24 |
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13 |
Without check valve insert, without throttle insert |
no code |
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With check valve insert |
P |
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Throttle Ø 1.2 mm |
B12 |
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Throttle Ø 1.5 mm |
B15 |
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Throttle Ø 1.8 mm |
B18 |
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Throttle Ø 2.0 mm |
B20 |
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Throttle Ø 2.2 mm |
B22 |
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14 |
NBR seals |
no code |
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FKM seals (other seals upon request) |
V |
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Observe compatibility of seals with hydraulic fluid used. |
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15 |
Without locating hole |
no code |
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With locating hole and locking pin ISO 8752-3x8-St |
/62 |
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16 |
Further details in the plain text |
* |
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| 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
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Size |
6 | ||
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Weight |
2/2 directional seat valve |
kg |
1.5 |
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3/2 directional seat valve |
kg |
1.5 | |
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4/3 directional seat valve |
kg |
2.3 | |
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Installation position |
any | ||
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Ambient temperature range |
NBR seals |
°C |
-30 … +50 |
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FKM seals |
°C |
-20 … +50 | |
hydraulic
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Size |
6 | ||
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Maximum operating pressure |
Port P |
bar |
350 |
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Port A |
bar |
350 | |
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Port B |
bar |
350 | |
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Maximum flow |
l/min |
25 | |
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Hydraulic fluid |
see table | ||
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Hydraulic fluid temperature range |
NBR seals |
°C |
-30 … +80 |
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FKM seals |
°C |
-20 … +80 | |
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Viscosity range |
mm²/s |
2.8 … 500 | |
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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. |
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Hydraulic fluid |
Classification |
Suitable sealing materials |
Standards |
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Mineral oil |
HL, HLP |
FKM, NBR |
DIN 51524 |
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Bio-degradable |
Insoluble in water |
HEES (synthetic esters) |
FKM |
VDMA 24568 |
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HETG (rape seed oil) |
FKM, NBR |
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Soluble in water |
HEPG (polyglycols) |
FKM |
VDMA 24568 |
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Other hydraulic fluids on request |
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electrical
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Voltage type |
Direct voltage | AC voltage | ||
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Available voltages 1) |
V |
12 / 24 / 42 / 96 / 110 / 205 / 220 | 110 / 120 / 230 | |
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Voltage tolerance (nominal voltage) |
% |
± 10 | ||
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Power consumption |
W |
30 | ||
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Duty cycle |
% |
100 | ||
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Switching time according to ISO 6403 |
ON |
ms |
40 … 70 | |
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OFF (without rectifier) |
ms |
10 … 20 | ||
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OFF (with rectifier) |
ms |
30 … 45 | ||
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Maximum switching frequency |
Operating pressure ≤350 bar |
1/h |
15000 | |
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Operating pressure >350 bar |
1/h |
3600 | ||
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Protection class according to DIN EN 60529 |
IP65 (with mating connector mounted and locked) | |||
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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
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Connection voltage (DC voltage) |
V |
24 | ||
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Voltage tolerance (connection voltage) |
+30 %/-15 % | |||
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Admissible residual ripple |
% |
≤ 10 | ||
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Max. load capacity |
mA |
400 | ||
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Switching outputs 
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PNP transistor outputs, load between switching outputs and GND | |||
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Pinout 
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1 |
V |
24 | |
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2, 4 |
Switching output |
mA |
400 | |
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3 |
Earthing (GND) |
V |
0 | |
M12x1 plug-in connection
electrical
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M12x1 plug-in connections 1) |
K72L | ||
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Available voltages 2) |
V |
24 | |
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Limited switch-off voltage peak |
V |
-44 … -55 | |
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Voltage tolerance (nominal voltage) |
% |
± 10 | |
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Power consumption |
W |
30 | |
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Duty cycle |
% |
100 | |
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Switching time according to ISO 6403 |
ON |
ms |
40 … 70 |
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OFF (without rectifier) |
ms |
10 … 20 | |
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OFF (with rectifier) |
ms |
30 … 45 | |
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Maximum switching frequency |
Standard |
1/h |
15000 |
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Protection class according to DIN EN 60529 3) |
IP65 | ||
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Protection class according to DIN EN 61140 |
III | ||
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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, 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
(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)
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Symbol |
Comment |
Operating pressure in bar |
Flow in l/min |
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P |
A |
B |
T |
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2/2-way circuit (2/2 directional seat valve) |
PK |
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350 |
350 |
25 |
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NK |
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350 |
350 |
25 |
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2/2-way circuit (3/2 directional seat valve) |
UK |
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With 2/2-way circuits, port P or T must be closed. |
350 |
350 |
350 |
25 |
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CK |
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350 |
350 |
350 |
25 |
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3-way circuit |
UK |
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350 |
350 |
350 |
25 |
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CK |
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350 |
350 |
350 |
25 |
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4-way circuit (flow only possible in the direction of arrow) |
D |
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3/2 directional valve (symbol "UK") in connection with Plus-1 plate: pP ≥ pA ≥ pB ≥ pT |
350 |
350 |
350 |
pP – 40 |
25 |
|
Y |
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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” |
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2.1 |
Dimension for valve with concealed manual override "N9" |
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2.2 |
Dimension for valve without manual override |
|
3 |
Mating connector without circuitry (separate order) |
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4 |
Mating connector with circuitry (separate order) |
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5 |
Space required to remove the coil |
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6 |
Space required to remove the mating connector |
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7 |
Attention! |
|
8 |
Name plate |
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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) |
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4 |
Mating connector with circuitry (separate order) |
|
5 |
Space required to remove the coil |
|
6 |
Space required to remove the mating connector |
|
7 |
Attention! |
|
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 |
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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
or
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
or
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
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
Mating connectors for valves with connector “K4”, with rectifier
3P RZ5
Mating connectors for valves with connector “K4”, with rectifier
3P RZ5
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 rectifier
3P RZ55
Mating connectors for valves with connector “K4”, with rectifier
3P RZ55
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
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