BOSCH REXROTH
R901225859

$492.91 USD

BOSCH REXROTH
Material:R901225859
Model:LFA50DZ2-7X/210XY

Quantity in stock: 0

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***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 LFA50DZ2-7X/210XY (R901225859) is a precision-engineered hydraulic component designed for seamless integration into advanced fluid power systems. This model is a manual pressure adjustment control cover for way cartridge valves, facilitating reliable sequencing of pressure in conjunction with a way cartridge valve according to the specified hydraulic symbol. The LFA50DZ2-7X/210XY is characterized by its robust construction and can withstand a maximum pressure as indicated by its product group specifications. This control cover offers manual actuation for pressure adjustments, allowing users to finely tune the sequencing of pressures within their hydraulic systems. It features subplate mounting with a connection diagram that adheres to ISO standards, ensuring compatibility with a wide range of equipment. The weight and size are optimized for its function, while the NBR seals provide durability and resistance against various hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, and HFC. The LFA50DZ2-7X/210XY allows for different pressure functions to be realized by combining it with appropriate cartridge valves. Its design includes a pilot control valve that can be integrated or mounted on the control cover for either manual or electrically proportional pressure adjustments. The unit's flexibility is further demonstrated through its capability to enable pressure-dependent connection of secondary systems by setting the required switching pressure on the pilot control valve. Circuit examples provided with this model illustrate its application in scenarios like pressure-dependent unloading of low-pressure systems or connection of secondary systems upon reaching specified pressures. These examples demonstrate the practicality and versatility of the LFA50DZ2-7X/210XY in complex hydraulic circuits. Furthermore, this component belongs to Component series X, indicating it adheres to current engineering standards and practices as designated by Bosch Rexroth.

Size 50, manual pressure adjustment for sequencing pressure

Control cover for 2-way cartridge valves Reliable sequencing of pressure in connection with a 2-way cartridge valve according to the hydraulic symbol.

Unpacked Weight: 9.360 kg

General

2-way cartridge valves for pressure functions are pilot-operated valves in seat or spool design. The power section designed as cartridge valve (1) is installed into a receiving hole standardized according to DIN ISO 7368 and closed with a control cover (2).

The pilot control valve (4) for manual or electrically proportional pressure adjustment is integrated into the control cover (2) or is installed on the control cover (2) as pilot valve with mounting dimensions according to DIN 24 340.

By combination of cartridge valves with the control covers, different pressure functions can be realized. .

technical illustration-R901225859-Size 50, manual pressure adjustment for sequencing pressure

Pressure sequencing functions

This function enables pressure-dependent connection of a second system.

The required switching pressure is set at the pilot control valve integrated into the control cover.

The pilot oil supply may either be realized externally (pilot oil port X) or internally (from port A via pilot oil ports X or Z2).

The pilot control spring chamber is directed via ports Y or Z1, depressurized to the tank.

Circuit examples

Example 1: (Circuit for pressure-dependent unloading of the low-pressure system)

In the illustrated circuit, the system is supplied via a high-pressure and a low-pressure pump. The system pressure pS acts externally from the high-pressure side via pilot oil port X on the pilot control valve, which sets the low-pressure side to depressurized circulation after the set pressure value is reached. The check valve RV (not included in the scope of delivery) prevents the connection of the high-pressure system with the now depressurized low-pressure system.

On reaching the pressure set at the pilot control spring, the pilot control valve is switched and the spring chamber of the main valve to the tank is unloaded. The main spool is opened and the connection A to B is released.

With the version LFA..DZW..., the required switching position can be selected besides the hydraulic circuit by means of an electrically operated pilot control valve (not included in the scope of delivery of the control cover LFA..DZ...).

Example 2: (Circuit for pressure-dependent connection of a second system)

With this circuit, system 2 is not connected before the pressure in system 1 complies with the specified value. Pilot oil discharge is realized internally from port A of the main valve.

DZ
Size 16 … 100
Maximum operating pressure 420 bar

Data Sheet	Download Data Sheet
Manual	Download Manual
Manual	Download Manual
Manual	Download Manual

Max. pressure	315
Productgroup ID	9,10,11,12,13,14
Type of actuation	manual pressure adjustment
Size	50
Type of connection	Subplate mounting
Connection diagram	ISO 7368
Weight	9.360
Seals	NBR
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC

General information on the control cover for the pressure sequencing function

01	02	03	04		05		06	07	08
LFA		DZ		‒	7X	/

Type
01	Control cover LFA	LFA
Size
02	NG 16	16
	NG 25	25
	NG 32	63
	NG 40	40
	NG 50	50
	NG 63	63
Version
03	Pressure sequence function	DZ 1)
Adjustment type for pressure adjustment
04	Rotary knob	1
	Sleeve with hexagon and protective cap	2
	Lockable rotary knob with scale (H-locking according to automotive standard)	3
	Rotary knob with scale	4
Component series
05	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)	7X
Pressure rating (max. adjustable sequencing pressure)
06	Set pressure up to 210 bar	210
	Set pressure up to 315 bar	315
	Set pressure up to 350 bar	350
Pilot oil flow
07	Internal pilot oil supply - internal pilot oil return	no code
	External pilot oil supply - internal pilot oil return	X
	Internal pilot oil supply - external pilot oil return	Y
	External pilot oil supply - external pilot oil return	XY
Seal material
06	NBR seals	no code
06	FKM seals	V

	1) Control covers type LFA..DZ... are combined with 2-way cartridge valves type LC..DB

Additional preferred types and standard units are specified in the EPS (standard price list).

Orifice symbol	Symbol in ordering code
A**	A**	This orifice is designed as screw-type orifice. If an orifice is to be installed, the respective code letter with the orifice Ø in 1/10 mm has to be entered in the type designation. Example: A12 = Orifice with Ø1.2 mm in channel A.
Ø1,2		This orifice is designed as bore. No specifications are made in the type designation. (Orifice Ø in mm)
Z12		This orifice is designed as screw-type orifice. This is a standard orifice. No specifications are made in the type designation. (Orifice Ø in 1/10 mm)

general

Size	16	25	32	40	50

hydraulic

Size			16	25	32	40	50
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
	FKM seals	°C	-20 … +80
Viscosity range		mm²/s	2.8 … 380
Maximum admissible degree of contamination of the hydraulic fluid 1)			Class 20/18/15 according to ISO 4406 (c)

1)	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.

Hydraulic fluid		Classification	Suitable sealing materials	Standards
Mineral oil		HL, HLP	FKM, NBR	DIN 51524
Bio-degradable	Insoluble in water	HEES (synthetic esters)	FKM	VDMA 24568
	Insoluble in water	HETG (rape seed oil)	FKM, NBR	VDMA 24568
	Soluble in water	HEPG (polyglycols)	FKM	VDMA 24568
Other hydraulic fluids on request

Steuerdeckel

Size				16	25	32	40	50
maximum admissible operating pressure in port ...	...X		bar	315
	...Z2		bar	315
	...Y	static	bar	315
		at pressure control		depressurized (up to ≈ 2 bar)
	...Z1	static	bar	315
		at pressure control		depressurized (up to ≈ 2 bar)
	Adjustable sequencing pressure		bar	210 315 350

For applications outside these parameters, please consult us!

Overview (basic symbols), Pressure sequencing function

LFA..DZ.-../ 210 315 350

Control cover with manual pressure adjustment

LFA..DZ.-../ 210 315 350 Y

LFA..DZ.-../ 210 315 350 X

LFA..DZ.-../ 210 315 350 XY

Attention!

Control covers type LFA..DZ... are combined with 2-way cartridge valves type LC..DB... (see ordering code)

Installation bore and connection dimensions according to ISO 7368

NG16 ... 63

Dimensions in mm

5	Bore for locating pin (cover pin assembled according to DIN 24 342)
6	Information on porting pattern NG 16: Length L1 (axis x–y bores) is 80 mm
8	Bore for locating pin at function as main pressure relief valve (reposition cover pin for assembly accordingly)

NG 16 to 50