2/2, 3/2 and 4/2 directional seat valve with manual actuation M-.SMM

Description

• Size 10, 6
• Component series 3X
• Maximum operating pressure 420 / 630 bar
• Maximum flow 40 l/min

Features

• Direct operated directional seat valve with manual actuation
• Porting pattern according to DIN24340, form A (without locating hole)
• Safe switching also with longer standstill periods under pressure
• Operating methods: manual (hand lever)
• Inductive position switch (contactless), optional

Product description

2/2 and 3/2 directional seat valve

General

The directional valve of the M-.SMM type is a directional seat valve with manual, mechanical operation. It controls start, stop and direction of flow and basically comprises of the housing (1), type of actuation (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 (7), and by the relevant type of actuation (2) in the switching position. The actuation force acts via 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. Therefore, the valve system (3) is pressure-compensated in relation to the actuating forces (actuation 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 start of the opening of one valve seat to the closure 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.

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:

2/2 directional seat valve
Symbol “P”
Initial position	P and T connected
Spool position	P blocked
Symbol “N”
Initial position	P blocked
Spool position	P and T connected

3/2 directional seat valve
Symbol “U”
Initial position	P and A connected, T blocked
Spool position	P blocked, A and T connected
Symbol “C”
Initial position	P blocked, A and T connected
Spool position	P and A connected, T blocked

Type M-2S.. 6 N…

Type M-3S.. 6 U…

4/2 directional seat valve

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

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.

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”.

In order to avoid pressure intensification when using differential cylinders, the annulus area of the cylinder must be connected at A.

Symbol “D”
Symbol “Y”

Type M-4S.. 6 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.

2/2 and 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.

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.

Type code

01	Mineral oil					M
02	2 main ports (NG6 only)					2
	3 main ports					3
	4 main ports					4
03	Seat valve, direct operated					SMM
			Manually actuated (hand lever)
04	Size 6					6
	Size 10					10
05	Main ports		2 1)	3	4
	Symbols		●	–	–	P
			●	–	–	N
			–	●	–	U
			–	●	–	C
			–	–	●	D
			–	–	●	Y
			● = available
06	Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions)					3X
07	Without detent					no code
	With detent					F
08	Operating pressure 420 bar					420 bar
	Operating pressure 630 bar					630 bar
Additional equipment Inductive position switch
09	Without position switch					no code
	Monitored spool position "a"					QMAG24
	Monitored spool position "b"					QMBG24
10	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
	Other orifices on request
Seal material
11	NBR seals					no code
	FKM seals (other seals upon request)					V
	Observe compatibility of seals with hydraulic fluid used.
12	Further details in the plain text					*

Technical data

general

hydraulic

Inductive position switch type QM: electrical connection

The electric connection is realized via a 4-pole mating connector (separate order) with connection thread M12 x 1.

electrical

Connection voltage (DC voltage)			V	24
Voltage tolerance (connection voltage)				+30 %/-15 %
Admissible residual ripple			%	≤ 10
Max. load capacity			mA	400
Switching outputs				PNP transistor outputs, load between switching outputs and GND
Pinout	1		V	24
	2, 4	Switching output	mA	400
	3	Earthing (GND)	V	0

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

Diagrams/characteristic curves

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

Δp-qV characteristic curve 2/2 directional seat valve (NG6)

3/2 directional seat valve (NG6)

4/2 directional seat valve (NG6)

Check valve insert (NG6)

Throttle insert (NG6)

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

Δp-qV characteristic curve 3/2 directional seat valve (NG10)

4/2 directional seat valve (NG10)

Check valve insert (NG10)

Throttle insert (NG10)

Symbols/Circuit diagrams

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 B, monitored spool position "b"

Version QMB

Position switch on side A, monitored spool position "b"

Performance limit (measured with HLP46, ϑoil = 40 ± 5 °C)

	Symbol		Comment
2/2-way circuit (2/2 directional seat valve)	P		pP ≥ pT
	N
2/2-way circuit (3/2 directional seat valve) as unloading function only	U		Before switching from the initial position to the switching position, pressure must be applied to port A. pA≥pT
	C		pA ≥ pT
3-way circuit	U		pP ≥ pA ≥ pT
	C
4-way circuit (flow only possible in the direction of arrow)	D		3/2 directional valve (symbol “U”) in connection with Plus-1 plate: pP> pA ≥pB >pT
	Y		3/2 directional valve (symbol “C”) in connection with Plus-1 plate: pP >pA ≥pB >pT

Attention!

Please observe the “General notices”!

Dimensions

2/2, 3/2 directional seat valve – NG6

Dimensions in mm

Valve mounting screws (separate order)

• 420 bar version:

4 hexagon socket head cap screws

ISO 4762 M5 x 50 - 10.9 - flZn-240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 7 Nm ± 10 %,

material no. R913000064

• 630 bar version:

4 hexagon socket head cap screws

ISO 4762 M6 x 50 - 10.9 - flZn-240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10 %,

material no. R913000151

4/2 directional seat valve – NG6

Dimensions in mm

Valve mounting screws (included in the scope of delivery)

• 420 bar version:

4 hexagon socket head cap screws

ISO 4762 M5 x 95 - 10.9 - flZn - 240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 7 Nm ± 10 %,

material no. R913000223

• 630 bar version:

4 hexagon socket head cap screws

ISO 4762 M6 x 95 - 10.9 - flZn - 240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10 %,

material no. R913000549

3/2 directional seat valve – NG10

Dimensions in mm

Valve mounting screws (separate order)

• 420 bar version:

4 hexagon socket head cap screws

ISO 4762 M6 x 65 - 10.9 - flZn - 240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10 %,

material no. R913000127

• 630 bar version:

4 hexagon socket head cap screws

ISO 4762 M8 x 65 - 10.9 - flZn - 240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 30 Nm ± 10 %,

material no. R913000368

4/2 directional seat valve – NG10

Dimensions in mm

Valve mounting screws (included in the scope of delivery)

• 420 bar version:

4 hexagon socket head cap screws

ISO 4762 M6 x 115 - 10.9 - flZn - 240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 12.5 Nm ± 10 %,

material no. R900018811

• 630 bar version:

4 hexagon socket head cap screws

ISO 4762 M8 x 115 - 10.9 - flZn - 240 h-L

(friction coefficient μtotal = 0.09 to 0.14);

tightening torque MA = 30 Nm ± 10 %,

material no. R913000368

Operating methods

Type M-.SMM…

Dimensions in mm

Spool position monitoring

Dimensions in mm

Inductive position switch type QM

Dimensions in mm

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Information

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

In order to ensure a safe functioning, it is absolutely necessary to observe the following:

• In order to switch the valve safely and/or maintain it in its spool position, the pressure must be pP ≥ pA ≥ pT (for design reasons).

• Seat valves have a negative spool overlap, i.e. leakage oil occurs during the switching process. However, this process takes place within such a short time that it is irrelevant in nearly all cases of use.

• The indicated maximum flow must not be exceeded (if applicable, use a throttle insert for flow limitation)!

Plus-1 plate:

• When using the Plus-1 plate (4/2 directional function), the following lower operating values are 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 arbitrarily exchanged or closed!

• With 3- and 4-way switching position, port T must always be connected.

• The flow is only admissible in the direction of arrow!

Ordering codes

Downloads

	Hydraulic valves and hydroelectric pressure switches for industrial applications Manual | RE07600-B | 2021-06-21 | English | PDF | 306k Product Groups: Industrial Hydraulics On/off, proportional, high-response and servo valves, pressure switches
	2/2, 3/2 and 4/2 directional seat valve with mechanical, manual or fluidic operation Data Sheet | RE22340 | 2006-10-01 | English | PDF | 239k Product Groups: Direct operated