LOGIC COVER LFA50DB2-7X/310NE

Manufacturer: Bosch Rexroth

Material #: R901412473

Model : LFA50DB2-7X/310NE

***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 LFA50DB2-7X/310NE (R901412473) is a sophisticated pressure relief valve designed for subplate mounting and manual pressure adjustment. This valve is part of the Typeexamination tested safety valves type LFA, which complies with the Pressure Equipment Directive EU and operates as a pilot-operated 3-way cartridge valve in a seat design. The product features a reliable pressure limitation unit integrated into its control cover, ensuring that the pressure is effectively limited in conjunction with a way cartridge valve. The LFA50DB2-7X/310NE has been meticulously engineered to fit installation bores according to ISO standards, and it comes with a factory nozzle fitting that must not be altered to maintain its integrity and performance. The valve's construction includes a cartridge valve designed as a seat valve without an area difference, which increases operational safety by preventing internal leakage from the spring chamber to port B. This model is capable of handling maximum operating pressures up to bar and can accommodate maximum flow rates of l/min. The pressure limitation unit is available with an optional rotary knob for easy manual adjustment of the pressure setting without affecting the set relief pressure, facilitating regular functional tests. With its hexagon type actuation for manual pressure adjustment and NBR seals suitable for various hydraulic fluids such as HL, HLP, HLPD, HVLP, HVLPD, HFC, this Bosch Rexroth valve is designed for reliability and ease of use. The product also offers different response pressure adjustment types and can be ordered with an optional sealable valve mounting set as accessories. With its size component series X designation, this model exemplifies Bosch Rexroth's commitment to quality in hydraulic components.

$4,679.00 USD

More are expected on April 15, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as April 15, 2025 when ordered in

This product is eligible for factory repair.

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LOGIC COVER LFA50DB2-7X/310NE

Size 50, manual maximum pressure adjustment

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

Unpacked Weight: 10.750 kg

Installation bore according to ISO 7368 (main pressure relief valve) Response pressure 50 ... 400 bar adjustment types, optionally:
- Hexagon
- Rotary knob Valve mounting set (sealable) as accessories

General

Type-examination tested safety valves type LFA . DB…E according to Pressure Equipment Directive 2014/68/EU are pilot-operated 2-way cartridge valves in seat design with set relief pressure setting pmax.

The complete valve generally consists of one cartridge valve (1) for installation bores according to ISO 7368 and one respective control cover (2) with integrated sealed pressure limitation unit (4).

The factory nozzle fitting (9) ("X", "F") as well as the installed compression spring (10) must not be changed.

The installation position ("D") is not fitted. The cartridge valve (1) is designed as seat valve without area difference. The relief pressure effective at port A is directed to the spring chamber (6) of the cartridge valve (1) and to the pressure limitation unit (4) via channel X (5). The piston sealing (7) prevents an internal leakage from the spring chamber (6) to port B and thus increases the operational safety by avoiding gap filtration. Under the pressure value set at the pressure limitation unit (4), the spool (3) is pressure-compensated and remains closed in a seat-tight manner due to the spring force of the compression spring (10). The pressure equilibrium at the spool (3) is only changed when the relief pressure at port A is reached, namely by opening the pressure limitation unit (4), so that excessive hydraulic fluid directly flows to

channel B via the spool (3) and the pressure in A is limited to the set pressure value.

The pressure limitation unit (4) is optionally available with rotary knob. This allows for a manual reduction of the pressure adjustment without changing the relief pressure setting. This simplifies a regular functional test.

Hexagon
Type-examination tested
Size 32 … 63
Maximum operating pressure 420 bar
Maximum flow 5000 l/min
Type-examination tested safety valves according to Pressure Equipment Directive 2014/68/EU
Component series 7X

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

Max. pressure	400
Productgroup ID	9,10,11,12,13,14
Type of actuation	manual pressure adjustment
Size	50
Type of connection	Subplate mounting
Weight	10.750
Seals	NBR
Hydraulic fluid	HL,HLP,HLPD,HVLP,HVLPD,HFC

01	02	03	04		05		06	07	08
LFA		DB		–	7X	/			E

01	Control cover	LFA
02	Size 40	40
	Size 50	50
	Size 63	63
03	Pressure relief function	DB
Adjustment types
04	Rotary knob	1
04	Hexagon	2
05	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)	7X
Response pressure (50 … 400 bar, in steps of 10 bar, for maximum flow, see below)
06	50 bar	050
	60 bar	060
	…bar	…
	400 bar	400
Seal material
07	NBR seals	N
	FKM seals	F
	Observe compatibility of seals with hydraulic fluid used.
08	Type-examination tested safety valve according to Pressure Equipment Directive 2014/68/EU	E

Size	Component marking	Maximum flowqVmax in l/min "Q"		Response pressure p in bar "p"
Size	Component marking	Mineral oils: HL, HLP	Other approved hydraulic fluids (see "Technical data")	Response pressure p in bar "p"
40	TÜV.SV.▢‒1138.38.F.Q.p	900	800	50 … 90
		1500	1350	100 … 190
		2000	1800	200 … 290
		2400	2150	300 … 400
50	TÜV.SV.▢‒1138.48.F.Q.p	1400	1400	50 … 90
		2000	2000	100 … 190
		2600	2600	200 … 290
		3600	3600	300 … 400
63	TÜV.SV.▢‒1138.61.F.Q.p	1750	1550	50 … 90
		2500	2250	100 … 190
		3600	3600	200 … 290
		5000	5000	300 … 400

▢ Information is entered at the factory

Order example:

qV = 2200 l/min, p = 270 bar

→ Type LFA 50 DB.‒7X/270.E

→ TÜV.SV.▢‒1138.48.F.2600.270

general

Size		40	50	63
Ambient temperature range	°C	-10 … +80

hydraulic

Size			40	50	63
Maximum operating pressure	Port B	bar	15
	Port T		depressurized to the tank
	Port Y		depressurized to the tank
Maximum response pressure	Port A	bar	400
	Port X	bar	400
Maximum flow 1)	Port A to B	l/min	2400	3600	5000
Maximum pilot flow	Port Y	l/min	4	15	23
	Port T	l/min	4	15	23
Hydraulic fluid			see table below
Hydraulic fluid temperature range		°C	-10 … +60
Viscosity range		mm²/s	12 … 230
Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 2)			Class 20/18/15

1)	With mineral oil
2)	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	Data sheet
Mineral oils		HL, HLP	NBR, FKM	DIN 51524	90220
Bio-degradable	Insoluble in water	HETG	FKM	ISO 15380	90221
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Flame-resistant	Water-free	HFDU (glycol base)	FKM	ISO 12922	90222
		HFDU (ester base)	FKM
		HFDR	FKM
	Containing water	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922	90223
Important information on hydraulic fluids: For more information and data on the use of other hydraulicfluids, please refer to the data sheets above or contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). Flame-resistant - containing water: Life cycle as compared to operation with mineral oil HL, HLP 30 … 100%. Bio-degradable and flame-resistant: If this hydraulic fluid is used, small amounts of dissolved zinc may get into the hydraulic system.

For applications outside these parameters, please consult us!

Admissible flow ranges – size 40

Mineral oil

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

Other approved hydraulic ﬂuids (see "Technical data")

(simulated; kinetic viscosity 40 mm²/s)

Admissible flow ranges – size 50

Mineral oil

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

Other approved hydraulic ﬂuids (see "Technical data")

(simulated; kinetic viscosity 40 mm²/s)

Admissible flow ranges – size 63

Mineral oil

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

Other approved hydraulic ﬂuids (see "Technical data")

(simulated; kinetic viscosity 40 mm²/s)

Notes:

The flow values only apply for depressurized pilot oil return. Operating points in the gray areas of the characteristic curves are not admissible with this valve. Observe the admissible flows of the overall system.

Dimensions in mm

1	Name plate
2	Locating pin
3	Pilot control valve, adjustment type "2"
4	Pilot control valve, adjustment type "1"
5	For valve mounting set, see below
6	External connections

NG	H1	H2	H3	H4	H5	H6	▢ L1	L2	L3	L4	L5	D1	D2
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
40	60	32	27	69	105	28	125	89	76	60	68	G1/4	G1/4
50	60	34	31	67	122	23	140	105	84	70	79	G1/2	G1/4
63	82	50	40	91	155	30	180	144	90	90	90	G1/2	G1/2

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Valve mounting set (separate order)

Size	Quantity	Comprising:	Material number
40, 50	4	Hexagon socket head cap screw ISO 4762 - M20 x 80 - 10.9-flZn/nc/480h/C (thereof 1 special screw with bore) Tightening torque MA = 480 Nm ±10 %	R901362574
40, 50	1	Sealing material	R901362574
63	4	Hexagon socket head cap screw ISO 4762 - M30 x 110 - 10.9-flZn/nc/480h/C (thereof 1 special screw with bore) Tightening torque MA = 1600 Nm ±10 %	R901362575
63	1	Sealing material	R901362575

Notices:

For reasons of stability, exclusively the specified valve mounting screws may be used. The specified tightening torques were calculated with total friction coefficient μtotal = 0.09 ... 0.14; adjust in case of modified surfaces. The specified tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10%).

Installation bore and connection dimensions according to ISO 7368 (main pressure relief valve)

1	Depth of fit
2	Port B can be positioned arbitrarily, radially to port A, observing the tapped holes and pilot oil bores.
3	Bore for locating pin

NG		40	50	63
ØD1H7	mm	75	90	120
ØD2	mm	40	50	63
ØD3	mm	40	50	63
ØD3 max 1)	mm	50	63	80
ØD4H7	mm	55	68	90
D5		M20	M20	M30
ØD6	mm	10	10	12
ØD7H13	mm	6	8	8
H1	mm	84.5	97.5	127
H2	mm	105	122	155
H2	mm	+ 0.1	+ 0.1	+ 0.1
H3	mm	87	100	130
H3	mm	± 0.3	± 0.3	± 0.3
H4	mm	45	45	65
H5	mm	15	17	20
H6	mm	3	3	4
H7	mm	30	35	40
H8	mm	3	4	4
H9	mm	2.5	2.5	3
L1	mm	125	140	180
L2	mm	85	100	125
L3	mm	42.5	50	62.5
L4	mm	50	58	75
L5	mm	23	30	38
U	mm	0.05	0.05	0.05
Ro max	mm	4	4	4
Ru max	mm	1	1	1

1)	Recommendation deviating from the standard.

Safety instructions

When selecting a type-examination tested safety valve, it must be observed that for the desired response pressure p the maximum flow possible lies below the admissible flow qVmax . According to the Pressure Equipment Directive 2014/68/EU, the increase in the system pressure due to the flow must not exceed 10 % of the set response pressure (see type key, component marking). The maximum admissible flow specified in the component marking qVmax must not be exceeded! Discharge lines of safety valves must end in a risk-free manner. Fluid must not accumulate in the discharge system (see data sheet AD2000 A2). Safety valves with adjustment type “1” (rotary knob) may only be unloaded in case of maintenance. Operation outside the specified pressure ranges is not admissible.

Always observe application notes:

The response pressure with a flow of 12 l/min and a hydraulic fluid viscosity of 46 mm2/s specified in the component marking is set by default. Within the admissible viscosity range, the response pressure may vary by +3 % (230 mm2/s) to -3 % (12 mm2/s).

The maximum flow stated in the component marking applies for applications without counter pressure in the control line (port Y). By removing the lead seal at the safety valve, the approval according to the Pressure Equipment Directive becomes void. The nozzle fittings installed at the factory as well as the main spool compression spring must not be changed. Basically, the requirements of the Pressure Equipment Directive and of data sheet AD 2000 A2 have to be observed. In order to prevent unauthorized assembly, the valve assembly can be additionally secured by means of the valve mounting set (sealing) (separate order, see “Dimensions”).

LOGIC COVER LFA50DB2-7X/310NE

Manufacturer: Bosch Rexroth

Material #: R901412473

Model : LFA50DB2-7X/310NE

More are expected on April 15, 2025

This product is eligible for factory repair.

general

hydraulic

Admissible flow ranges – size 40

Mineral oil

Other approved hydraulic ﬂuids (see "Technical data")

Admissible flow ranges – size 50

Mineral oil

Other approved hydraulic ﬂuids (see "Technical data")

Admissible flow ranges – size 63

Mineral oil

Other approved hydraulic ﬂuids (see "Technical data")

Valve mounting set (separate order)

Installation bore and connection dimensions according to ISO 7368 (main pressure relief valve)

Safety instructions

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