PRESSURE RELIEF VALVE DBDS 4 K1X/420-350 SO156

Manufacturer: Bosch Rexroth

Material #: R900976452

Model : DBDS 4 K1X/420-350 SO156

***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 DBDS 4 K1X/420-350 SO156 (R900976452) is a screw-in cartridge valve designed as a direct operated pressure relief valve for block installation. This model is part of the DBD.K product family, which falls under the pressure relief valve category, and is specifically crafted to meet high sealing demands for system pressure limitation. The valve operates with a maximum pressure of 350 bar (5076 psi) and can accommodate a maximum flow of 4 l/min (1.06 gpm), ensuring efficient performance in various hydraulic applications. This Bosch Rexroth valve boasts an NBR sealing material and utilizes a poppet-type spool for its operation, ensuring leak-free performance up to a cracking pressure deviation of less than 10%. Users can adjust the system pressure through one of two adjustment options: either a headless setscrew with an internal hexagon or an optional hand wheel, providing versatility and precision in controlling the desired pressure settings. The DBDS 4 K1X/420-350 SO156 is designed to remain closed at its initial position, with the main port's pressure acting on the spring plate through control line and poppet. Once the set value on the compression spring is exceeded by rising pressure in the main port, the poppet opens allowing hydraulic fluid to flow into the main port. Weighing at just . kg, this compact yet robust component ensures reliability in direct acting applications where high-performance relief functionalities are required. It is compatible with hydraulic fluids HL and HLP, making it suitable for a wide range of hydraulic systems. With its Mx cavity size and direct pilot operation mode, it represents Bosch Rexroth's commitment to engineering excellence in hydraulic system components.

$919.40 USD

More are expected on May 19, 2025

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Status: This product is temporarily out of stock.

Qty: Delivered as early as May 19, 2025 when ordered in

This product is eligible for factory repair.

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PRESSURE RELIEF VALVE DBDS 4 K1X/420-350 SO156

Unpacked Weight: 0.0741 kg

Screw-in cartridge valve For applications with especially high tightness requirements Leakage-free up to a maximum of 80 % of the set cracking pressure 2 adjustment types, optionally:
• Grub screw with internal hexagon
• Hand wheel

The pressure valve type DBD...SO156 is a direct operated pressure relief valve for the installation in block designs.

It is used for applications with especially high sealing requirements for limiting a system pressure.

The system pressure can be set via the adjustment type (4).

The valve is closed in initial position. Via control line (2) and poppet (1), the pressure in the main port ① acts on the spring plate (5). If the pressure in the main port ① rises above the value set at the compression spring (3), the poppet (1) opens and the hydraulic fluid flows into the main port ②

Screw-in cartridge valve
Maximum operating pressure 420 bar (6000 psi)
Maximum flow 20 l/min (5 gpm)
Cavity M14x1

Max. pressure	420
Adjustment options	Headless setscrew with internal hexagon
Product family classification	Pressure relief valve, direct operated
Productgroup ID	9,10,11,12,13,14
Product family type	DBD.K
Ports number	2
Sealing material	NBR
Cavity	M14x1
Product type	DBD.K
Max. flow	20
Type of connection	Screw-in cartridge valve
Nominal flow	20
Direct - Pilot	Direct acting
Product family	Relief
Spool Poppet	Poppet type
Weight	0.0741
Hydraulic fluid	HL,HLP

01	02	03	04	05		06	07	08	09	10	11
DBD		4	K	1X	/				V	S0156	*

01	Pressure relief valve, direct controlled	DBD
Adjustment type
02	Grub screw with internal hexagon	S
02	Hand wheel	H
03	Size 4	4
04	Cartridge valve	K
05	Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions)	1X
Pressure rating
06	Set pressure up to 50 bar	50
	Set pressure up to 100 bar	100
	Set pressure up to 200 bar	200
	Set pressure up to 315 bar	315
	Set pressure up to 420 bar	420
Seal material
07	set to cracking pressure	–
07	set and sealed to cracking pressure	P
Cracking pressure
08	Cracking pressure 90 +5 bar	e.g. 090
Seal material
09	FKM seals	V
09	Observe compatibility of seals with hydraulic fluid used. (Other seals upon request)
10		SO156
11	Further details in the plain text	*

hydraulic

Size		4
Maximum operating pressure	bar	420
Maximum flow	l/min	20
Hydraulic fluid		see table
Hydraulic fluid temperature range	°C	-20 … +80
Viscosity range	mm²/s	20 … 200
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.

general

Size		4
Weight (approx.)	kg	0.05
Installation position		any
Ambient temperature range	°C	-20 … +80

For applications outside these parameters, please consult us!

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

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

pE-qV characteristic curves

Δp-qv characteristic curve

The characteristic curves apply for output pressure = 0 in the entire flow range!

Definition cracking pressure:

Pressure in bar with qV = 0.95 +0.05 l/min

➀	Main port 1 (P)
➁	Main port 2 (T)

Dimensions in mm

1.1	Adjustment type “S”, internal hexagon SW5
1.2	Adjustment type “H”, hand wheel
2	Lock nut SW17
3	Hexagon SW17, tightening torque during screw-in MA = 23±2 Nm
4	embossed type designation

➀	Main port 1 (P)
➁	Main port 2 (T)
LS	Location shoulder

➀	Main port 1 (P)
➁	Main port 2 (T)
LS	Location shoulder
Tolerance for all angles ± 0.5 °

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 EN ISO 1302
Surface condition	DIN EN ISO 1302