BOSCH REXROTH
R900938048

BOSCH REXROTH
Material:R900938048
Model:LC50DR20E7X/

Due to extremely high demand, please call 877-366-7226 for availability

***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 LC50DR20E7X/ (R900938048) is a sophisticated hydraulic component designed to regulate pressure within a hydraulic system through its pressure reducing function. This cartridge valve is engineered for integration into standardized receiving holes according to DIN ISO specifications, and it is secured with a control cover that can accommodate either manual or electrically proportional pilot control valves for precise pressure adjustments. These pilot valves conform to mounting dimensions set by DIN standards, offering flexibility in system design. The LC50DR20E7X/ valve operates as a spool valve without an area difference at port B, meaning there are no effective areas at this port. This design ensures that in its rest position the valve remains open, allowing free flow from port B to port A. The pilot oil supply orifice channels the effective pressure at port A to the spring side of the spool. Under normal conditions and when the pressure set at the pilot control valve is not exceeded, the spool remains open due to spring force, allowing uninterrupted flow. When system pressure reaches the set limit, the spool moves to a closed position, triggering a reduction in pressure at port A as per the specific pressure-flow characteristics of this model. By combining different cartridge valves with appropriate control covers, users can achieve various pressure functions tailored to their hydraulic system's requirements. This particular model from Bosch Rexroth has been crafted with precision and reliability in mind, ensuring consistent performance in controlling hydraulic pressures and improving overall operational efficiency. Its robust design allows for maximum flow rates while maintaining stability and responsiveness within a broad range of hydraulic applications.

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. .

Pressure reducing function

Rest position open

The cartridge valve for the pressure reducing function is designed as spool valve without area difference (no effective areas at port B).

As pilot control valve, identical cover types as for the pressure relief function are applied (type LFA..DB...).

The effective pressure at port A is directed via the pilot oil supply orifice to the spring side of the spool. Under the performance limit and the pressure set at the pilot control valve, the spool is pressure-compensated and retained in open position by the spring force to enable free flow from port B to port A.

On reaching the set pressure, the spool is closed and the pressure at port A is reduced according to the pressure-flow characteristics.

Type
01	Cartridge valve	LC
Size
02	NG 16	16
	NG 25	25
	NG 32	32
	NG 40	40
	NG 50	50
	NG 63	63
Version
03	Pressure relief function	DR
Cracking pressure
04	Cracking pressure 0 bar (without spring)	00
	Cracking pressure approx. 2 bar	20
	Cracking pressure approx. 3 bar 1)	30
	Cracking pressure approx. 4 bar	40
	Cracking pressure approx. 5 bar (NG16, 25 and 32 only)	50
	Cracking pressure approx. 8 bar 2)	80
Damping
05	Piston without precision grooves	E
Component series
06	Component series 70 ... 79 (70 ... 79: unchanged installation and connection dimensions)	7X
Seal material
07	NBR seals	no code
07	FKM seals	V

01	02	03	04	05	06		07
LC		DR		E	7X	/

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

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

hydraulic

Size			16	25	32	40	50	63
Maximum operating pressure	Port A	bar	315
Maximum operating pressure	Port B	bar	315
Maximum flow	LC..DR20.../..	l/min	100	200	300	750	1000	1600
Maximum flow	LC..DR40.../..	l/min	150	300	450	1000	1300	2000
Hydraulic fluid			Mineral oil (HL, HLP) according to DIN 51524; fast biodegradable hydraulic fluids according to VDMA 24568 ; HETG (rape seed oil); HEPG (polyglycols); HEES (synthetic esters), other hydraulic fluids on request
Hydraulic fluid temperature range	NBR seals	°C	-30 … +80
Hydraulic fluid temperature range	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.

For applications outside these parameters, please consult us!

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

LC 16 DR…

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

LC 25 DR…

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

LC 32 DR…

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

LC 40 DR…

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

LC 50 DR…

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

LC 63 DR…

Version "E"		Version “D”
Area ratio A1 : A2 = 2 : 1 Version "…A.E…"	Area ratio A1 : A2 = 14.3 : 1 Version "…B.E…"	Area ratio A1 : A2 = 2 : 1 Version "…A.D…"	Area ratio A1 : A2 = 14.3 : 1 Version "…B.D…"

Installation bore and connection dimensions according to ISO 7368

Dimensions in mm

1	Depth of fit
2	Control dimension
3	If a different diameter is used for port B than ØD3 or (ØD3*), the distance from the cover support surface to the bore center must be calculated.
4	Port B may be positioned around the central axis of port A. However, it must be observed that the mounting bores and the control bores are not damaged.
7	At Ø ≤45 mm → Fitting H8 admissible

NG	ØD1		ØD2	ØD3/(ØD3*)	ØD4		ØD5	ØD6 1)	ØD7		H1/(H1*)	H2	H3	H4	H5	H6	H7	H8	H9	L1	L2	L3	L4	L5	W
NG	mm		mm	mm	mm			mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm
16	32	H7 -	16	16 25	25	H7 -	M8	8	4	H13 -	35 29.5	56	43	20	11	2	20	2	0.5	65 80	46	23	25	10.5	0.05
25	45	H7 -	25	25 32	34	H7 -	M12	6	6	H13 -	44 40.5	72	58	25	12	2.5	30	2.5	1	85 -	58	29	33	16	0.05
32	60	H7 -	32	32 40	45	H7 -	M16	8	6	H13 -	52 48	85	70	35	13	2.5	30	2.5	1.5	102 -	70	35	41	17	0.1
40	75	H7 -	40	40 50	55	H7 -	M20	10	6	H13 -	64 59	105	87	45	15	3	30	3	2.5	125 -	85	42.5	50	23	0.1
50	90	H7 -	50	50 63	68	H7 -	M20	10	8	H13 -	72 65.5	122	100	45	17	3	35	4	2.5	140 -	100	50	58	30	0.1
63	120	H7 -	63	63 80	90	H7 -	M30	12	8	H13 -	95 86.5	155	130	65	20	4	40	4	3	180 -	125	62.5	75	38	0.2

1)	Maximum dimension

BOSCH REXROTHR900938048

hydraulic