Directional poppet valves, directly operated, with solenoid actuation SE 6…XD

Description

• Size 6
• Component series 6X
• Maximum operating pressure 420 bar
• Maximum flow 12 l/min
• Area of application in accordance with the Explosion Protection Directive 2014/34/EU: I M2; II 2G
• Area of application according to technical rules EAC TR CU 012/2011: I M2; II 2G
• Type of protection valve:
  – Ex h I Mb X according to EN 80079-38
  – Ex h IIC T4 Gb X according to EN 80079-36
• Type of protection valve solenoid:
  – Ex db I Mb according to EN 60079-1
  – Ex db IIC T4 Gb according to EN 60079-1
• Valve solenoid certified according to IECEx

Features

• 3/2- or 4/2-way version
• For intended use in potentially explosive atmosphere
• Porting pattern according to ISO 4401-03-02-0-05 (but without locating hole)
• Blocked connection tight
• Safe switching also with longer standstill periods under pressure
• Air-gap DC solenoids
• Safe switching also with longer standstill periods under pressure
• Electrical connection with individual connection and cable gland
• With manual override

Product description

3/2 directional seat valve

General

Type SE directional seat valves are direct-operated directional valves with solenoid actuation. They control start, stop and direction of flow.

The directional valves basically comprise a housing (1), the solenoid (2), the hardened valve system (3) and the balls (4.1 and 4.2) as closing element.

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

Basic principle

In the initial position, the ball (4.1) is pressed onto the seat by the spring (7), in spool position, the ball (4.2) is pressed onto the seat by the solenoid (2). The force of solenoid (2) acts via the lever (17) and the ball (5) on the actuating plunger (6) 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). Thus, the valves can be used up to 420 bar.

Notices:

• The 3/2 directional seat valves have a "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 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. A throttle insert must be used for flow limitation, if necessary (see "Project planning information").

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

• The ports P, A and T are clearly determined according to their tasks. They must not be exchanged or closed. The flow is only admissible in the direction of arrow.

The seat arrangement offers the following options:
Symbol	U	C
Initial position	P and A connected, T blocked	P blocked, A and T connected
Spool position	P blocked, A and T connected	P and A connected, T blocked

Type M-3SE 6 C…

4/2 directional seat valve

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

Function of the Plus-1 subplate

• Initial position
  The main valve is not actuated. The spring (7) 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 control spool (8) is shifted against the spring (7) and the ball (4.2) is 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 subplate has a "positive spool overlap".

Notices:

• 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.

• When operating 4/2 directional seat valves, the minimum pressure must be 8 bar and the minimum flow must be 3 l/min.

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

• The ports P, A, B and T are clearly determined according to their tasks. They must not be exchanged or closed. The flow is only admissible in the direction of arrow.

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

Type M-4SE 6 Y…

Type code

01	Mineral oil			M
02	3 main ports			3
	4 main ports			4
03	Seat valve			SE
04	Size 6			6
Symbols
05	Main ports	3	4
		✔	–	U
		✔	–	C
		–	✔	D
		–	✔	Y
06	Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions)			6X
07	Operating pressure 420 bar			420
08	High-power solenoid (air-gap)			L
Power supply
09	Direct voltage 24 V			G24
10	With manual override			N
Explosion protection
11	"Flameproof enclosure", for details, see "Information on the explosion protection"			XD
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	FKM seals			V

Notice:

Representation according to ISO 1219-1.

Technical data

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:

• 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.

• 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 solenoid must not be installed close to charge generating processes.

• Contact of the connection cable with the casing surface is to be prevented.

• In case of bank assembly, only one solenoid of all valves may be energized at a time.

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.

Diagrams/characteristic curves

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

Performance limits

Notice:

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

Δp-qV characteristic curves

3/2 directional seat valve

Δp-qV characteristic curves

4/2 directional seat valve

Electrical connection

The type-examination tested valve solenoid is equipped with a terminal box and a type-tested cable and line entry.

The connection is polarity-independent.

Properties of the connection terminals and mounting elements

Cable gland

Connection line

Direct voltage, polarity-independent

Notice:

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

Over-current fuse and switch-off voltage peaks

Notices:

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 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

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 4401-03-02-0-05, 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)

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:

• 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.

Downloads

	Directional seat valves, direct-operated, with solenoid actuation Data Sheet | RE22047-XD | 2021-12-01 | English | PDF | 876k Product Groups: Directional seat valves Type SE …XD
	Directional seat valves, direct operated, with solenoid actuation Manual | RE22047-XD-B | 2021-11-01 | English | PDF | 1.4MB Product Groups: Industrial Hydraulics Type SE6..6X/...XD...
	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