LFA32EM19-7X/CA40DQMG24

Manufacturer: Bosch Rexroth

Material #: R900943574

Model : LFA32EM19-7X/CA40DQMG24

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth LFA32EM19-7X/CA40DQMG24 (R900943574) is a state-of-the-art way cartridge valve designed for integration into a compact block design. This product features a power section with connections A and B that fit into a standardized receiving hole in the control block, which is then sealed with a cover that connects to the pilot control valves. The valve is versatile, capable of being used for pressure, directional, and throttle functions or any combination thereof. It can be tailored to match various flow rates for different actuator paths, offering cost-effective solutions for multiple applications. The LFA32EM19-7X/CA40DQMG24 consists of two main components: the control cover and the installation kit. The control cover includes control bores and may feature stroke limitation functions, hydraulically controlled directional seat valves, or shuttle valves based on the required overall function. Electrically operated directional spool or seat valves can also be accommodated on the control cover. The installation kit comprises a bushing, ring (up to NG), valve poppet (with or without damping nose), and closing spring. This particular model operates based on pressure differences across three key areas—A1, A2, and A3—with varying area ratios that influence its functionality. Areas A1 and A2 are instrumental in the opening direction while area A3 along with a spring assists in closing. The resulting force direction determines the spool position of the valve. Bosch Rexroth's LFA32EM19-7X/CA40DQMG24 offers robust performance characteristics including high flow rates, low-pressure drops, quick switching velocities, and minimal leakage oil flows. It is designed for durability with high reliability and an extended life cycle. Additionally, it boasts a small installation size and low weight which makes it easy to service while still maintaining optimal performance. This way cartridge valve is suitable for applications requiring precise hydraulic flow management with modular setup options available to meet specific operational needs.

$5,744.00 USD

More are expected on November 22, 2024

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Status: This product is temporarily out of stock.

Qty: Delivered as early as November 22, 2024 when ordered in

This product is eligible for factory repair.

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Functional product design Modular set-up:• Cartridge valve with various options• Control cover in various variants for realization of selected functions• Electric monitoring of the spool position Power and flow-optimized design:• High flows• Low pressure drops• High switching velocities• Low leakage oil flowsRobust design:• High reliability• Long life cycle Other features:• Small installation size, low weight• Easy to service

2-way cartridge valves are elements that have been designed for a compact block design. The power section with connections A and B is installed into the control block in a receiving hole standardized according to ISO 7368 and closed with a cover. In most cases, the cover is also the connection from the control side of the power section to the pilot control valves.

By control with respective pilot control valves, the power section can be applied for pressure, directional and throttle functions or a combination of these functions. Particularly efficient solutions are realized by adjustment of the size to various flows of the individual ways of an actuator. The application of power sections of elements for multiple functions is very cost-effective.

2-way cartridge valves generally consist of control cover (1) and installation kit (2). The control cover contains the control bores and optionally a stroke limitation function, a hydraulically controlled directional seat valve or a shuttle valve according to the required overall function. Additionally, electrically operated directional spool or seat valves can be installed at a control cover. The installation kit consists of a bushing (3), ring (4) (only up to NG32), valve poppet (5), optionally with damping nose (6) or without damping nose (7) as well as closing spring (8).

The function of 2-way cartridge valves is pressure-dependent. This way, three crucial pressurized areas A1, A2, A3 are realized for the function. The area at valve seat A1 is observed as 100 %. Depending on the version, the annulus area A2 realized by grading is 7 % or 50 % of area A1. The area ratio A1 : A2 is respectively either 14.3 : 1 or 2 : 1. The area A3 is identical to the sum of areas A1 + A2. Due to the different area ratios A1 : A2 and the resulting different annulus areas (A2), the area A3 is one time 107 % and another time 150 % of the area A1 at the seat, which is observed as 100 %.

In general, the following applies:

The areas A1 and A2 are effective in opening direction. The area A3 and the spring are effective in closing direction. The direction of action of the resulting force from the opening and closing forces determines the spool position of the 2-way cartridge valve.

The 2-way cartridge valves can be passed from A to B or from B to A. Pressurization of area A3 by pilot oil discharge from channel B or external pilot oil supply, channel A is blocked without leakage.

01	02	03		04		05	06	07	08	09
LFA		EM19	–	7X	/			D	QMG24

Type
01	Control cover LFA		LFA
Size
02	NG 16		16
	NG 25		25
	NG 32		32
Version
03	Control cover version "EM19"	Intermediate cover with electrical control of the closed position incl. installation kit with spool sealing and possibility of control cover fitting	EM19
Component series
04	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)		7X
Spool design
05	A1 : A2 = 2 : 1 (annulus area = 50 %; standard version)		CA
	A1 : A2 = 14.3 : 1 (annulus area = 7 %)		CB
Cracking pressure
06	Cracking pressure 1.0 bar		10
	Cracking pressure 2.0 bar		20
	Cracking pressure 4.0 bar		40
Damping
07	Valve poppet with damping nose		D
Spool position monitoring
08	Electrical		QMG24
Seal material
09	NBR seals		no code
	FKM seals		V

Version
„CA“	„CB“

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oils		HL, HLP, HLPD, HVLP, HVLPD	NBR, FKM	DIN 51524
Bio-degradable	Insoluble in water	HETG	NBR, FKM	ISO 15380
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Containing water	Water-free	HFDU, HFDR	FKM	ISO 12922
Containing water	Containing water	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922
Important information on hydraulic fluids! For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)! The flash point of the hydraulic fluid used must be 40 K higher than the maximum solenoid surface temperature. Flame-resistant – containing water: Maximum pressure differential at the seat 50 bar Pressure pre-loading at the tank port >20 % of the pressure differential; otherwise, increased cavitation Life cycle compared to operation with mineral oil HL, HLP 50 to 100 %

Size of the annulus area
Surface in cm2	Version	Size
Surface in cm2	Version	16	25	32
A1	„CA“	1,89	4,26	6,79
A1	„CB“	2,66	5,73	9,51
A2	„CA“	0,95	1,89	3,39
A2	„CB“	0,18	0,43	0,67
Spool form (damping nose)
		Size
		16	25	32
Stroke	cm	0,9	1,17	1,4
Pilot volume	cm3	2,56	7,21	14,3
Theoretical pilot flow 1)	l/min	15,4	43,3	86
Cracking pressure in bar
	Version	Size
	Version	16	25	32
Direction of flow A to B	„CA10“	0,70	0,68	0,72
	„CA20“	2,03	2,18	2,12
	„CA40“	3,50	3,90	3,80
	„CB10“	0,49	0,50	0,51
	„CB20“	1,44	1,62	1,52
	„CB40“	2,48	2,90	2,70
Direction of flow B to A	„CA10“	1,38	1,53	1,42
	„CA20“	4,05	4,91	4,25
	„CA40“	6,96	8,74	7,6
	„CB10“	7,43	6,69	7,24
	„CB20“	21,3	21,5	21,6
	„CB40“	36,6	38,3	38,6

	1) Switching time = 10 ms

general

Size			16	25	32
Ambient temperature range	NBR seals	°C	-30 … +60
	FKM seals	°C	-20 … +60
MTTFD values according to EN ISO 13849 1)		Years	150

1)	For further details, see data sheet 08012

hydraulic

Size			16	25	32
Maximum operating pressure	Without directional valve	bar	400
	Anschluss A 1)	bar	315 350
	Port B 1)	bar	315 350
	Port X 1)	bar	315 350
	Port Z1 1)	bar	315 350
	Port Z2 1)	bar	315 350
	Port Y		depending on the maximum tank pressure of the attached directional valve
	With electrically monitored spool position	bar	400
Maximum flow 2)		l/min	25000
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
	FKM seals	°C	-20 … +80
Viscosity range		mm²/s	2.8 … 500
Maximum admissible degree of contamination of the hydraulic fluid 3)			Class 20/18/15 according to ISO 4406 (c)

1)	dependent on the attached directional valve
2)	NG-dependent; see characteristic curves
3)	The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter.

For applications outside these parameters, please consult us!

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

Size 16 (A → B)

Size 16 (B → A)

Size 25 (A → B)

Size 25 (B → A)

Size 32 (A → B)

Size 32 (B → A)

Notice:

The indicated characteristic curves have been determined without inserted springs.

Orifices
Thread	Orifice Ø in mm
M6 conical	0,5 … 3,0
M8 x 1 conical	0,5 … 4,0
G3/8	0,8 … 6,0
G1/2	1,0 … 8,0

Other orifices upon request.

Plug screws
Thread	Tightening torqueMA in Nm
M6	–
M8 x 1	7
G3/8	55
G1/2	80
G3/4	135
G1	225
G1 1/4	360

LFA . EM19… (NG16 … 32)

Inductive position switch type QM

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

electrical

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

Switching logics

Cartridge element (design as seat valve with damping noses)

Cartridge valves are hydraulically controlled seat or spool valves with two working ports A and B and one control port X or two control ports X and Z for the version with differential spool. Y is generally the leakage oil connection. The valves are available in sizes 16, 25, 32, 40, 50, 63, 80, 100, 125 and 160.

Criteria for determination of the size include the flow to be controlled as well as flow resistance values of cartridge valves and their area ratios.

Control cover

By means of control cover (2), the bore of the cartridge elements is closed. They also serve as connection element between cartridge valve and pilot control valve.

Pilot control valve

At control covers for set-up of a directional spool valve (3) or seat valve (4), the porting pattern is realized according to ISO 4401 and DIN 24340.

The cartridge element (1) and the control cover (2) form a functional unit. It is calibrated at the factory and must not be disassembled or combined with other third-party components.

The closed spool position is monitored by the attached position switch (5).

Control cover (intermediate cover) “EM” with electrical control of the closed position, incl. installation kit and possibility of control cover fitting: NG16 … 32

Dimensions in mm

1	Position switch type QM
2	Angled mating connector (separate order, material no. R900082899)
3	Space required to remove the mating connector
4	Protective housing
5	Standard cover (separate order, see data sheet 21010)
6	Mounting screws not included in the scope of delivery

Notice:

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %). The specified tightening torques were calculated with total friction coefficient μ = 0.14; adjust in case of modified surfaces.

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Hexagon socket head cap screws ISO 4762 - 10.9
Size	Quantity	Tightening torqueMA in Nm
16	4	32
25	4	110
32	4	270

NG	H1	H2	L1	▢ L2	L3
NG	mm	mm	mm	mm	mm
16	60	15	80	46	65
25	75	24	85	58	85
32	80	28	100	70	100

Inductive position switches

Contactless position switches with integrated switching amplifiers are switched shortly before reaching the spool position to be monitored. The spool position reached is displayed by a binary signal.

Advantages of the position switches:

Short-circuit-proof Direct monitoring of the spool position at the control spool. Long life cycle High reliability due to no use of dynamic seals Reaction time of the switch upon operation approx. 15 ms.

Notice:

Valves with inductive position switches and proximity sensors in safety-relevant controls may only be assembled and commissioned by hydraulically and electrically trained specialists. Service work requires special tools and equipment. This work may only be performed by authorized specialists or in the factory!

Improper work at safety equipment leads to a risk of personal injury and damage to property!

The valve components are coordinated in the production plant and adjusted during assembly. They must not be interchanged. In case of valve or position switch defects, the complete valve must be exchanged! The factory setting of the position switch must not be changed. The position switch may only be set by Bosch Rexroth. The position switch must be automatically monitored by the machine control to prevent initiation of a new machine cycle even in case of a defect at the position switch.

Orifice selection

Spare parts & repair

LFA32EM19-7X/CA40DQMG24

Manufacturer: Bosch Rexroth

Material #: R900943574

Model : LFA32EM19-7X/CA40DQMG24

More are expected on November 22, 2024

This product is eligible for factory repair.

general

hydraulic

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

Size 16 (A → B)

Size 16 (B → A)

Size 25 (A → B)

Size 25 (B → A)

Size 32 (A → B)

Size 32 (B → A)

LFA . EM19… (NG16 … 32)

Inductive position switch type QM

Switching logics

Control cover (intermediate cover) “EM” with electrical control of the closed position, incl. installation kit and possibility of control cover fitting: NG16 … 32

Orifice selection

Mating connectors for sensors and valves with connector “K24”, “K35” and “K72”, M12 x 1

4P Z24

Mating connectors for sensors and valves with connector “K24”, “K35” and “K72”, M12 x 1

4P Z24

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