Directional poppet valves, directly operated, with solenoid actuation SED 6…XE

Description

• Size 6
• Component series 1X
• Maximum operating pressure 350 bar
• Maximum flow 25 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 4401-03-02-0-05 (but without locating hole)
• Wet-pin DC or AC solenoids
• Electrical connection with individual connection and cable gland
• With concealed manual override, optional

Product description

3/2 directional seat valve

General information

Directional valves of type SED are direct operated directional seat valve with solenoid actuation.

They control start, stop and direction of flow.

The directional valves basically consists of a housing (1), the solenoid (2), the valve seats (7) and (11) as well as of the control spool (4).

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

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

Basic principle

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 control spool (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).

By means of the control spool (4), the ports P, A and T can be loaded with the maximum operating pressure (350 bar) and the flow can be directed in both directions (see symbols).

In the initial position, the control spool (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.

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

The seat arrangement offers the following options:
Symbol	UK	CK

Type M-3SED 6 UK...

Throttle insert

The use of a throttle insert is required when, due to prevailing operating conditions, flows occur during the switching processes which exceed the performance limit of the valve.

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 (5) holds the control spool (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 (8), which is thus unloaded to the tank. The pressure applied via P now pushes the ball (9) onto the seat (10). Now, P is connected to B, and A to T.

• Transition position:
  When the main valve is actuated, the control spool (4) is shifted against the spring (5) and pressed onto the seat (7). 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 (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".

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-4SED 6 Y...

Type code

01	Mineral oil			M
02	3 main ports			3
	4 main ports			4
03	Seat valve			SED
04	Size 6			6
Symbols
05	Main ports	3	4
		✔	–	UK
		✔	–	CK
		–	✔	D
		–	✔	Y
06	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)			1X
07	Operating pressure 350 bar			350
08	Solenoid, wet (wet-pin), with detachable coil			C
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			W230R
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
Seal material (observe compatibility of seals with hydraulic fluid used, see "Technical data")
14	NBR seals			no code
	FKM seals			V
15	Standard			no code
	Lower system pressure			SO151 1)

Notice:

Representation according to ISO 1219-1.

Technical data

general

hydraulic

electrical

Information on explosion protection – Directive 2014/34/EU

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

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").

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:

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 – version “UK"

Dimensions in mm

Required surface quality of the valve contact surface

3/2 directional seat valve – version "CK"

Dimensions in mm

Required surface quality of the valve contact surface

4/2 directional seat valve – version “D”

Dimensions in mm

Required surface quality of the valve contact surface

4/2 directional seat valve, version “Y”

Dimensions in mm

Required surface quality of the valve contact surface

Valve mounting screws (separate order)

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.

Accessories

Subplates

Subplates

Downloads

	Directional seat valves, direct-operated with solenoid actuation Data Sheet | RE22049-XE-710 | 2020-03-01 | English | PDF | 741k Product Groups: Direct operated Type SED …XE…710
	Directional seat valves, direct operated, with solenoid actuation Data Sheet | RE22049-XE | 2020-11-01 | English, United States | PDF | 1MB Product Groups: Direct operated Type SED …XE
	Directional seat valves,direct operated,with solenoid actuation Manual | RE22049-XE-B | 2020-09-01 | English | PDF | 1.9MB Product Groups: On/off valves Type SED6 ..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