Directional poppet valves, directly operated, with solenoid actuation SEW 10…XE

Description

• Size 10
• Component series 1X
• Maximum operating pressure 420 bar
• Maximum flow 40 l/min
• Area of application in accordance with the Explosion Protection Directive 2014/34/EU: II 2G; II 2D
• Type of protection valve:
  – Ex h IIC T4 Gb X according to EN 80079-36
  – Ex h IIIC T115°C Db X according to EN 80079-36
• Type of protection, solenoid coil:
  – Ex eb mb IIC T4 Gb according to EN 60079-7 / EN 60079-18
  – Ex tb IIIC T115°C Db according to EN 60079-31
• Solenoid coil certified according to IECEx

Features

• 3/2- or 4/2-way version
• For intended use in potentially explosive atmosphere
• Porting pattern according to ISO 4401-05-04-0-05
• Blocked port is tight
• Safe switching also with longer standstill periods under pressure
• Air-gap DC and AC solenoids
• Solenoid coil is rotatable by 90°
• Electrical connection as individual connection with cable gland
• With concealed manual override, optional

Product description

3/2 directional seat valve

General

Directional valves of the type SEW…XE are direct operated directional seat valves with solenoid actuation. It controls the start, stop and direction of flow.

The directional valves basically comprise a housing (1), the solenoid (2), the hardened valve system (3) and the control spool (8).

For proper functioning, the hydraulic system has to be bled properly.

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 control spool (8) that is sealed on two sides. The chamber between the two sealing elements is connected to port P. Thus, the valve system (3) is pressure-compensated in relation to the actuating forces (solenoid or return spring).

Notice:

• The 3/2 directional seat valves have a "negative spool overlap". Therefore, port T must always be connected. This 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. This process takes, however, place within such a short time that it is irrelevant in nearly all applications.

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

• Make sure that the specified maximum flow is not exceeded. Use a throttle insert for flow limitation, if necessary (see table "Throttle insert, check valve insert").

The seat arrangement offers the following options:
Symbol	U	C

Type M-3SEW 10 U…N9XE...

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 actuated. 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 control spool (8) is shifted against the spring (9) and pressed onto the seat (15). During this, port T is blocked, 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".

Notice:

When operating 4/2 directional seat valves to control differential cylinders, the annulus area of the cylinder must only be connected with connection A of the valve. Otherwise, pressure peaks can be created while switching, which will exceed the maximum operating pressure.

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

Type M-4SEW 10 Y…XE...

Type code

01	Mineral oil			M
02	3 main ports			3
	4 main ports			4
03	Seat valve			SEW
04	Size 10			10
Symbols
05	Main ports	3	4
		✔	–	U
		✔	–	C
		–	✔	D
		–	✔	Y
06	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)			1X
07	Operating pressure 420 bar			420
08	Solenoid (air-gap)			M
09	Direct voltage 24 V			G24
	Direct voltage 110 V			G110
	Alternating voltage 110 V 50/60 Hz			W110R
	Alternating voltage 230 V, 50/60 Hz			W230 R
10	With concealed manual override			N9
	Without manual override			no code
Explosion protection
11	“Increased safety”, for details, please refer to the "information on explosion protection"			XE
Electrical connection
12	Solenoid with terminal box and cable gland, for details see "Electrical connection"			Z2
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
Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")
14	NBR seals			no code
	FKM seals			V

Notice:

Representation according to ISO 1219-1.

Technical data

general

hydraulic

electrical

Information on explosion protection

Special application conditions for a safe application

• Connection lines must be passed in a strain-relieved way. The first mounting point must be within 150 mm of the cable and line entry.

• Maximum ambient temperature:
  In case of bank assembly, as long as only one solenoid is energized at a time, and in case of individual assembly +70 °C.
  In case of bank assembly when several solenoids are energized simultaneously +60 °C.

• The maximum temperature of the surface of the valve jacket is 115 °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 t in ms (installation position: solenoid horizontal)

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.

	Symbol		Comment	Operating pressure in bar				Flow in l/min
				P	A	B	T
3-way circuit	U		Pressure at P ≥ A ≥ T	420	420	‒	100	40
	C			420	420	‒	100	40
2-way circuit (as unloading function only)	U		Before switching from the initial position to the spool position, pressure must be applied to port A. Pressure at A ≥ T	‒	420	‒	100	40
	C		Pressure at A ≥ T	‒	420	‒	100	40
4-way circuit (flow only possible in the direction of arrow)	D		Valve (symbol U) in connection with Plus-1 plate P > A ≥ B > T	420	420	420	100	40
	Y		Valve (symbol C) in connection with Plus-1 plate P > A ≥ B > T	420	420	420	100	40

Notices:

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

• Please observe the general notes (see chapter "Information").

(For applications outside these values, please consult us!)

Diagrams/characteristic curves

(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

Electrical connection

The type-examination tested solenoid coil of the valve is equipped with a terminal box, a type-examination tested cable entry and a type-examination tested blind plug.
The connection is polarity-independent.
Solenoid coils to be connected to AC voltage are equipped with an integrated rectifier.

Notice:

When establishing the electrical connection, the protective grounding conductor (PE) must be connected correctly.

Properties of the connection terminals and mounting elements

Connection line

Direct voltage, polarity-independent	AC voltage

Notice:

Only use finely stranded conductors if they have pressed-on wire end ferrules.

Over-current fuse and switch-off voltage peaks

Notices:

Corresponding to the rated current, a fuse 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 short-circuit current of the supply source to be expected 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.

Dimensions

3/2 directional seat valve

Dimensions in mm

Required surface quality of the valve contact surface

Valve mounting screws (separate order)

4/2 directional seat valve

Dimensions in mm

Required surface quality of the valve contact surface

Valve mounting screws (included in the scope of delivery)

Subplates (separate order) with porting pattern according to ISO 4401-05-04-0-05, 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.

• Deviating from ISO 4401, port T is called TA, port T1 is called TB.

Installation conditions

(Dimensions in mm)

Dimensions in mm

Notice:

Please observe the "Special conditions for safe use".

Project planning information

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.

Information

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:

• In order to switch the valve safely or maintain it in its spool position, the pressure situation must be as follows: P ≥ A ≥ T (for design reasons).

• The ports P, A and T (3/2 directional seat valve) as well as P, A, B and T (4/2 directional seat valve) are clearly determined according to their tasks. They must not be exchanged or closed. The flow is only admissible in the direction of arrow.

• 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).

Plus-1 plate

• If the Plus-1 subplate (4/2 directional function) is used, the following lower operating values have to be observed: pmin = 8 bar, qV > 3 l/min.

• Port T must always be connected.

• Observe the pressure level and pressure distribution.

• The flow is only permitted in the direction of arrow.

Accessories

Subplates

Subplates

Ordering codes

Downloads

	Directional seat valves, direct operated, with solenoid actuation Data Sheet | RE22075-XE | 2021-01-01 | English | PDF | 953k Product Groups: Directional seat valves Type SEW …XE
	Directional seat valves, direct operated, with solenoid actuation Manual | RE22075-XE-B | 2020-11-01 | English | PDF | 1.9MB Product Groups: Industrial Hydraulics Type SEW10..1X/...XE...
	Explosion-protected hydraulic products for industrial and mobile applications Brochure | R999000373 | 2017-03-01 | English | PDF | 5.8MB Product Groups: Pumps, CD - single rod cylinder, Proportional, high-response and servo valves, Axial piston pumps, Mobile controls Product overview