Rexroth Solenoid Valve
Rexroth Valve M-3SEW
  • Description
  • Technique Feature
  • Specification
  • Applied Range

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Data Sheet of M-3SEW 6 Series

Data Sheet of M-3SEW 10 Series

REXROTH Type Code of M-3SEW Series

 

 

M-3SEW 6 Product description

2/2 and 3/2 directional seat valve

General

The SEW type directional valve is a directional seat valve with solenoid actuation. It controls the start, stop and direction of flow.

The valve basically consists of the housing (1), the solenoid (2), the hardened valve system (3) as well as the ball/the spool (4) as closing element.

Basic principle

In the initial position, the ball/the spool (4) is pressed onto the seat by the spring (9) and by the solenoid (2) in the switching position. The force of the solenoid (2) acts via the angled lever (6) and the ball (7) on the actuating plunger (8) that is sealed on two sides. The chamber between the two sealing elements is connected to port P. Therefore, the valve system (3) is pressure-compensated in relation to the actuating forces (solenoid or return spring). Therefore, the valves can be used up to 630 bar.

Notices!

- 3/2-directional seat valves feature "negative spool overlap". Therefore, port T must always be connected. That means that during the switching process – from the starting of the opening of one valve seat to the closing of the other valve seat – ports P–A–T are connected with each other. However, this process takes place within such a short time that it is irrelevant in nearly all cases of use.

- The manual override (10) allows for the switching of the valve without solenoid energization.

- It is to be ensured that the maximum flow indicated is not exceeded!If applicable, a throttle insert for flow limitation is to be inserted (see functional description).

Type M-3SEW 6 U …

 

Type M-2SEW 6 N …

 

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 (9) holds the ball (4.1) 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 (12), which is thus unloaded to the tank. The pressure applied via P now pushes the ball (13) onto the seat (14). Now, P is connected to B, and A to T.

- Transition position:

When the main valve is actuated, the spool (4.2) is shifted against the spring (9) and pressed onto the seat (15). 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 (12), the ball (13) is pressed onto the seat (16). Thus, B is connected to T, and P to A. The ball (13) in the Plus-1 plate has a "positive spool overlap".

Notices!

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 due to the pressure intensification. This pressure peak may exceed the maximum operating pressure over the permissible limit.

Type M-4SEW 6 Y …

 

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.

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 (see functional description)

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 (see functional description)

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

4/2 directional seat valve (see functional description)

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

 

 

M-3SEW 10 Product description

3/2 directional seat valve

General

The directional valve of the M-.SEW type is a directional seat valve with solenoid actuation. It controls the start, stop and direction of flow.

It basically comprises a housing (1), the solenoid (2), the hardened valve system (3) and the spool (8) as closing element.

Basic principle

In the initial position, the control spool (8) is pressed onto the seat by the spring (9) and in spool position by the solenoid (2). The force of the solenoid (2) acts via the angled lever (6) and the ball (7) on the spool (8) that is sealed on two sides. The chamber between the two sealing elements is connected to port P. Therefore, the valve system (3) is pressure-compensated in relation to the actuating forces (solenoid or return spring). Therefore, the valves can be used up to 630 bar.

Notice!

- 3/2-directional seat valves feature "negative spool overlap". Therefore, port T must always be connected. That means that during the switching process – from the starting of the opening of one valve seat to the closing of the other valve seat – ports P–A–T are connected with each other. However, this process takes place within such a period of time that it is irrelevant in nearly all cases of use.

- The manual override (10) allows for the switching of the valve without solenoid energization.

 

Attention!

It is to be ensured that the maximum flow indicated is not exceeded! If applicable, a throttle insert for flow limitation is to be inserted (see functional description).

The seat arrangement offers the following options:

Control spool symbol “U“

Control spool symbol “C”

 

Type M-3SEW 10 U…

 

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 (9) holds the ball (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 (12), which is thus unloaded to the tank. The pressure applied via P now pushes the ball (13) onto the seat (14). Now, P is connected to B, and A to T.

Transition position:

When the main valve is actuated, the spool (8) is shifted against the spring (9) and pressed onto the seat (15). During this, port T is blocked, while P, A, and B are briefly connected to each other.

Spool position:

P is connected to A. As the pump pressure acts via A on the large area of the control spool (12), the ball (13) is pressed onto the seat (16). Thus, B is connected to T, and P to A. The ball (13) 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:

Control spool symbol “D”

 

Control spool symbol “Y”

 

Type M-4SEW 10 Y…

 

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.

3/2 directional seat valve (see functional description)

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

4/2 directional seat valve (see functional description)

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.

3/2 directional seat valve (see functional description)

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

4/2 directional seat valve (see functional description)

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

 

M-.SEW 6 Technical data

general

Size

 

6

Weight

2/2 directional seat valve

kg

1.5

3/2 directional seat valve

kg

1.5

4/2 directional seat valve

kg

2.3

Installation position

 

 

any

Ambient temperature range

NBR seals

°C

-30 … +50

FKM seals

°C

-20 … +50

 

 

 

 

M-.SEW 10 Technical data

general

Size

10

Weight

3/2 directional seat valve

kg

2

4/2 directional seat valve

kg

3.5

Installation position

 

 

any

Ambient temperature range

NBR seals

°C

-30 … +50

FKM seals

°C

-20 … +50

 

 

M-.SEW 6 Features

2/2-, 3/2- or 4/2-way version

Porting pattern according to DIN 24340 form A

Porting pattern according to ISO 4401-03-02-0-05 and NFPA T3.5.1R2-2002D03

Air-gap DC solenoids with detachable coil

Solenoid coil is rotatable by 90°

The coil can be changed without having to open the pressure-tight chamber

Electrical connection as individual connection

Optional auxiliary operating device

Inductive position switch and proximity sensors (contactless)

 

 

 

M-.SEW 10 Features

Direct operated directional seat valve with solenoid actuation

Porting pattern according to ISO 4401-05-04-0-05 and NFPA T3.5.1 R2-2002 D05

Blocked port is leak-free closed

Reliable switching when under pressure over longer periods of standstill

Air-gap DC solenoids with detachable coil (AC voltage possible by means of a rectifier)

Solenoid coil is rotatable by 90°

Electrical connection as individual connection

With concealed manual override, optional

Inductive position switch (contactless), optional

 

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