L-DB50F2-3X/16-10

Manufacturer: Bosch Rexroth

Material #: R900950193

Model : L-DB50F2-3X/16-10

***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 L-DB50F2-3X/16-10 (R900950193) is a pilot-operated pressure relief valve designed to manage high flow rates with a low preload pressure. This component is part of the LDB series and is essential for hydraulic systems requiring precise pressure control. The valve features a main spool that is influenced by the pressure in channel P, which also directs pressure to the pilot control valve through specific nozzles. When the pressure surpasses the set value at the pilot control valve, it triggers an opening that allows pilot oil to be discharged into channel Y. This action causes the main spool to shift upwards against springs, creating a connection between channel P and T whenever the system's pressure exceeds the preset level at the pilot control valve. Notably, version U of this model utilizes an external spring to maintain the main spool in a closed position, enabling lower circulation pressure when the control channel is not loaded. The LDBF variant mirrors LDB's functionality but differs as it's designed without pipeline housing and is intended for flange connection as a cartridge valve. It adheres to DIN EN standards regarding flange connections, ensuring compatibility and ease of integration into existing systems. Users can make adjustments to the pressure settings via a sleeve with hexagon and protective cap, providing both precision and safety during operation. The Bosch Rexroth L-DB50F2-3X/16-10 has impressive specifications, including a maximum operating pressure of 350 bar and can accommodate maximum flow rates up to 10000 l/min. Its design as a component series X underscores its modern engineering and suitability for applications demanding robust performance under varying pressures and flows. This particular model's capabilities make it an indispensable part of hydraulic circuitry where controlled relief of excess pressure is critical for system integrity and performance.

$8,629.00 USD

More are expected on May 23, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 23, 2025 when ordered in

This product is eligible for factory repair.

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For flange connection As cartridge valve Flange connection according to DIN EN 1092-2 type 21 2 pressure ratings Adjustment type for pressure adjustment: Sleeve with hexagon and protective cap

Pressure valves of type L–DB are pilot-operated pressure relief valves for a low preload pressure. They are suitable for high flows.

The valves basically consist of pipeline installation housing (1), main spool guide (2) for accepting the pilot control valve (5) and main spool (3).

Type L–DB

The pressure applied to channel P acts on the main spool (3) and is simultaneously applied to the pilot control valve (5) via nozzles (4) and (6). If the pressure in channel P exceeds the value set at the pilot control valve (5), the latter opens and the pilot oil is directly discharged into channel Y (7).

The main spool (3) moves upwards against the springs (8) and (9) and connects channel P to channel T as long as the pressure exceeds the value set at the pilot control valve.

With version “U”, the main spool (3) is only kept closed by the external spring (9). If the control channel is unloaded, a lower circulation pressure can be achieved.

Type L–DBF

In principle, the function of version “L–DBF” corresponds to the function of type L–DB. The valve is, however, designed as cartridge valve without pipeline housing (1).

01	02	03	04	05		06		07	08	09	10	11
L–DB				2	–	3X	/					*

01	Pressure relief valve	L–DB
02	Pipeline installation	no code
02	Cartridge valve (only size 50 … 200)	F
03	Size 40	40
	Size 50	50
	Size 65	65
	Size 80	80
	Size 100	100
	Size 125	125
	Size 150	150
	Size 200	200
	Size 250	250
	Size 300	300
04	Flange connection according to DIN EN 1092-2 type 21	F
04	Cartridge valve	no code
Adjustment type
05	Sleeve with hexagon and protective cap	2
06	Component series 30 ... 39 (30 ... 39: unchanged installation and connection dimensions)	3X
Set pressure
07	Up to 16 bar	16
07	Up to 25 bar (only size 80, 100 and 150)	25
Pilot oil flow
08	Internal pilot oil supply, external pilot oil return	Y
08	External pilot oil supply, external pilot oil return	XY
09	Standard version	no code
09	Valve for minimum cracking pressure	U
Seal material
10	NBR seals	no code
	FKM seals	V
	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
11	Further details in the plain text	*

general

Size			40	50	65	80	100	125	150	200	250	300
Weight		kg	11	15	26	32	50	75	100	180	300	475
Installation position			any
Ambient temperature range	NBR seals	°C	-30 … +80
Ambient temperature range	FKM seals	°C	-15 … +80

hydraulic

Size			40	50	65	80	100	125	150	200	250	300
Maximum operating pressure	Port P	bar	16			16 25		16	16 25	16
	Port X	bar	16			16 25		16	16 25	16
	Port T	bar	16			16 25		16	16 25	16
Maximum counter pressure	Port Y	bar	16			16 25		16	16 25	16
Maximum flow		l/min	1000	1500	2700	3600	6000	7000	13000	24000	35000	50000
Hydraulic fluid			see table
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
	FKM seals	°C	-15 … +80
Viscosity range		mm²/s	10 … 800
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	Data sheet
Mineral oils		HL,HLP	NBR, FKM	DIN 51524	90220
Bio-degradable 2)	Insoluble in water	HETG	FKM	ISO 15380	90221
	Insoluble in water	HEES	FKM	ISO 15380
	Soluble in water	HEPG	FKM	ISO 15380
Containing water 2)	Water-free	HFDU	FKM	ISO 12922	90222
Containing water 2)	Containing water	HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620)	NBR	ISO 12922	90223
Important information on hydraulic fluids: For further information and data on the use of other hydraulic fluids, 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.)! The flash point of the hydraulic fluid used must be 40 K higher than the maximum valve surface temperature. Flame-resistant – containing water: Life cycle compared to operation with mineral oil HL, HLP 30 to 100 %

For applications outside these parameters, please consult us!

Notice:

The maximum operating pressure is the sum of the set pressure and counter pressure!

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

Minimum set pressure dependent on the flow

Size 40 … 80

Minimum set pressure dependent on the flow

Size 100 … 200

Notice:

The characteristic curves were simulated with external, depressurized pilot oil return.

Minimum set pressure dependent on the flow

Size 250 and 300

Type L–DB…Y…

Type L–DB…XY…

Pipeline installation “L–DB”

Dimensions in mm

1	Name plate (position may vary depending on the size)
2	Ports X for external pilot oil supply
3	Ports Y for external pilot oil return
4	Adjustment type "2"
5	Valve mounting bores
6	Ring bolt (2 pieces from NG50)

NG	L1		L2	L3	L4	L5	L6	H1	H2	H3	H4	B1	B2	ØD1	ØD3	ØD4	ØD5	ØD6
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
40	198	± 2	99	68	42.5	77.5	117	139	127	97.5	-	13	95	40	110	150	19	96
50	228	± 2	114	68	42.5	75	125	147	135	105.5	36	15	100	50	125	165	19	110
65	288	± 3	144	65	52	92	155	183	167	130	36	15	125	65	145	185	19	134
80...16	308	± 3	154	65	52	100	170	195.5	179.5	142.5	36	17	140	80	160	200	19	152
80...25	308	± 3	154	65	52	100	170	195.5	179.5	142.5	36	14	140	80	160	200	19	152
100...16	348	± 3	174	65	52	111	191	220	200	163	36	19	160	100	180	220	19	182
100...25	348	± 3	174	65	52	111	191	220	200	163	36	14	160	100	190	235	23	182
125	398	± 3	199	67	50.5	122.5	245	247.5	227.5	190.5	53	21	-	125	210	250	19	215
150...16	478	± 3	239	65	53	138	276	265	245	208	53	21	-	150	240	285	23	245
150...25	478	± 3	239	65	53	138	276	265	245	208	53	14	-	150	250	300	28	245
200	598	± 4	299	65	59	170	340	314	294	257	53	25	-	200	295	340	23	305
250	728	± 4	364	57	67	205	410	357	333	296	62	27	-	250	355	405	28	370
300	848	± 5	424	50	73.5	237.5	475	398	374	337	62	26	-	300	410	460	28	435

Notice:

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Cartridge valve “L–DBF”

Dimensions in mm

1	Name plate (position may vary depending on the size)
2	Ports X for external pilot oil supply
3	Ports Y for external pilot oil return
4	Adjustment type "2"
6	Ring bolt (2 pieces from NG50)

NG	L3	L4	L5	L6	H4	H5	H6	B2
NG	mm	mm	mm	mm	mm	mm	mm	mm
50	68	42.5	75	125	36	60.5	24.5	100
65	65	52	92	155	36	75.5	32	125
80	65	52	100	170	36	76	32	140
100	65	52	111	191	36	76	32	160
125	67	50.5	122.5	245	53	82	38	-
150	65	53	138	276	53	79	35	-
200	65	59	170	340	53	82	37	-

NG	L1	L2	L3	L4	L5	L6	L7	ØD1	ØD3	ØD4	ØD5	ØD6	ØD7	G	α	β	n
NG	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm		°	°
50	67.5	65.5	50	40.5	35	15	23	110	57	73	89	86	50	M12	45	90	4
65	83.5	81.5	60	55.5	45	20	29	134	75	89	105	105	65	M12	45	90	4
80	94.5	92.5	65	65.5	55	20	29	152	95	104	120	130	80	M16	45	90	4
100	114.5	112.5	76	75.5	67	30	38	182	109	128	148	160	100	M20	45	90	4
125	135	133	100	100.5	90	27	34	215	135	156	176	200	125	M20	30	60	6
150	153.5	151.5	110	110.5	105	27	34	245	160	183	203	230	150	M20	22.5	45	8
200	197	193	130	155.5	155	27	34	305	220	235	265	320	200	M20	15	30	12

Standards:
Workpiece edges	DIN ISO 13715
Form and position tolerance	DIN EN ISO 1101
General tolerances for metal-cutting procedures	DIN ISO 2768–mK
Tolerance	DIN ISO 8015
Surface condition	DIN EN ISO 1302

Type L–DB (not included in the scope of delivery)
NG	Quantity	Hexagon screw 1)	Hexagon nut	MA in Nm 2)
40	4	Hexagon screw ISO 4018 - M16 - 4.6	Hexagon nut ISO 4032-M16	63
50	4	Hexagon screw ISO 4018 - M16 - 4.6	Hexagon nut ISO 4032-M16	63
65	4	Hexagon screw ISO 4018 - M16 - 4.6	Hexagon nut ISO 4032-M16	63
80	8	Hexagon screw ISO 4018 - M16 - 4.6	Hexagon nut ISO 4032-M16	63
100 3)	8	Hexagon screw ISO 4018 - M16 - 4.6	Hexagon nut ISO 4032-M16	63
100 4)	8	Hexagon screw ISO 4018 - M20 - 4.6	Hexagon nut ISO 4032-M20	123
125	8	Hexagon screw ISO 4018 - M16 - 4.6	Hexagon nut ISO 4032-M16	63
150 3)	8	Hexagon screw ISO 4018 - M20 - 4.6	Hexagon nut ISO 4032-M20	123
150 4)	8	Hexagon screw ISO 4018 - M24 - 4.6	Hexagon nut ISO 4032-M24	213
200	12	Hexagon screw ISO 4018 - M20 - 4.6	Hexagon nut ISO 4032-M20	123
250	12	Hexagon screw ISO 4018 - M24 - 4.6	Hexagon nut ISO 4032-M24	213
300	12	Hexagon screw ISO 4018 - M24 - 4.6	Hexagon nut ISO 4032-M24	213

Type L–DBF (included in the scope of delivery)
NG	Fastening				Assembly aid (from NG80) 5)
NG	Quantity	Hexagon socket head cap screw	Part number	MA in Nm	Hexagon socket head cap screw	Part number
40	4	ISO 4762 - M12 x 70 - 10.9-flZn-240h-L	R913000515	35
50	4	ISO 4762 - M12 x 70 - 10.9-flZn-240h-L	R913000515	35
65	4	ISO 4762 - M16 x 90 - 10.9-flZn-240h-L	R913000544	85
80	4	ISO 4762 - M16 x 90 - 10.9-flZn-240h-L	R913000544	85	ISO 4762 - M16 x 120 - 8.8	R916445155
100	4	ISO 4762 - M20 x 100 - 10.9-flZn-240h-L	R913000386	165	ISO 4762 - M20 x 140 - 8.8	R916445188
125	6	ISO 4762 - M20 x 100 - 10.9-flZn-240h-L	R913000386	165	ISO 4762 - M20 x 160 - 8.8	R916445189
150	8	ISO 4762 - M20 x 100 - 10.9-flZn-240h-L	R913000386	165	ISO 4762 - M20 x 160 - 8.8	R916445189
200	12	ISO 4762 - M20 x 100 - 10.9-flZn-240h-L	R913000386	165	ISO 4762 - M20 x 140 - 8.8	R916445188
250	12	ISO 4762 - M24 x 100 - 10.9-flZn-240h-L	R913000407	285	ISO 4762 - M24 x 190 - 8.8	R916309987
300	14	ISO 4762 - M24 x 100 - 10.9-flZn-240h-L	R913000407	285	ISO 4762 - M24 x 220 - 8.8	R916445211

	1) In the selection and design, DIN EN 1092-2 is to be observed
	2) Tightening torques have been calculated with hexagon socket head cap screws ISO 4762 (galvanized)
	friction coefficient μtotal = 0.09 to 0.14
	3) Version “16”
	4) Version “25”
	5) In each case 2x

Notice:

The tightening torques stated are guidelines when using screws with the specified friction coefficients and when using a manual torque wrench (tolerance ± 10 %).

Notice:

The dimensions are nominal dimensions which are subject to tolerances.

Installation bore
Dimensions in mm

Dimensions in mm

L-DB50F2-3X/16-10

Manufacturer: Bosch Rexroth

Material #: R900950193

Model : L-DB50F2-3X/16-10

More are expected on May 23, 2025

This product is eligible for factory repair.

general

hydraulic

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

Minimum set pressure dependent on the flow

Minimum set pressure dependent on the flow

Minimum set pressure dependent on the flow

Type L–DB…Y…

Type L–DB…XY…

Pipeline installation “L–DB”

Cartridge valve “L–DBF”

Installation bore
Dimensions in mm

Related Products

Information

Account

L-DB50F2-3X/16-10

Manufacturer: Bosch Rexroth

Material #: R900950193

Model : L-DB50F2-3X/16-10

More are expected on May 23, 2025

This product is eligible for factory repair.

general

hydraulic

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

Minimum set pressure dependent on the flow

Minimum set pressure dependent on the flow

Minimum set pressure dependent on the flow

Type L–DB…Y…

Type L–DB…XY…

Pipeline installation “L–DB”

Cartridge valve “L–DBF”

Installation bore Dimensions in mm

Related Products

Information

Account

Installation bore
Dimensions in mm