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Description
- Size 2
- Component series 2X
- Maximum operating pressure 420 bar
- Maximum flow 2 l/min
Features
- Screw-in cartridge valve
- 6 pressure ratings
- 4 adjustment types, optionally:
• Hexagon with protective cap
• Rotary knob with scale
• Lockable rotary knob with scale
• Hand wheel
Product description
Function, section, symbol
Pressure valves of type DBD .. K are direct operated pressure relief valves to be installed in block designs. They are used for system pressure limitation. The system pressure can be set via the adjustment type (5).
In the initial position the valve is closed. Via control line (1) and ball (2), the pressure in the main port ① acts on the spring plate (3). If the pressure in the main port ① rises above the value set at the compression spring (4), the ball (2) opens and the hydraulic fluid flows into the main port ②.
| ➀ | Main port 1 (P) |
| ➁ | Main port 2 (T) |
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | |
| DBD | 2 | K | 2X | / | V | * |
| 01 | Pressure relief valve, direct controlled | DBD |
| Adjustment type | ||
| 02 | Hexagon with protective cap | S |
| Rotary knob with scale | L | |
| Lockable rotary knob with scale | A | |
| Hand wheel | H | |
| 03 | Size 2 | 2 |
| 04 | Screw-in cartridge valve | K |
| 05 | Component series 20 … 29 (20 … 29: unchanged installation and connection dimensions) | 2X |
| Pressure rating | ||
| 06 | Set pressure up to 25 bar | 25 |
| 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 | |
| Sealed set pressure (adjustment type “S” only) | ||
| 07 | Unsealed | no code |
| Sealed – please specify set pressure (setting interval si]5 bar[/si][imp]75 psi[/imp] ) | P...1) | |
| Seal material | ||
| 08 | NBR seals | no code |
| FKM seals | V | |
| Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) | ||
| 09 | Further details in the plain text | * |
| 1) | Order example: Set pressure 190 bar → DBDS 2 K2X/200P180V |
Technical data
(For applications outside these values, please consult us!)
general
| Size | 2 | |
| Weight (approx.) | kg | 0.3 |
| Installation position | any | |
| Ambient temperature range | °C | -20 … +80 |
hydraulic
| Size | 2 | ||
| Maximum operating pressure | Inlet | bar | 420 |
| Outlet | bar | 315 | |
| Maximum set pressure | bar | 25 50 100 200 315 420 | |
| Maximum flow | l/min | 2 | |
| Recommended | l/min | 1.5 | |
| Hydraulic fluid | see table | ||
| Hydraulic fluid temperature range | °C | -20 … +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, HLPD, HVLP, HVLPD | NBR, FKM | DIN 51524 | 90220 | |
| Bio-degradable | Insoluble in water | HETG | NBR, FKM | ISO 15380 | 90221 |
| HEES | FKM | ||||
| Soluble in water | HEPG | FKM | ISO 15380 | ||
| Flame-resistant | Water-free | HFDU, HFDR | FKM | ISO 12922 | 90222 |
| Containing water | HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620 ) | NBR | ISO 12922 | 90223 | |
| Important information on hydraulic fluids:
Flame-resistant – containing water:
Bio-degradable and flame-resistant: When using hydraulic fluids that are simultaneously zinc-solving, zinc may accumulate (per pole tube 0.7 g zinc). | |||||
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
p-qV characteristic curves
Notice:
The characteristic curves apply to output pressure = zero in the entire volume flow range and were measured without housing resistance.
General information
Hydraulic counter pressures in the main port ➁ (T) add 1:1 to the response pressure of the valve set at the adjustment.
Example:
- Pressure adjustment of the valve due to spring preloading (item 4 on product description) pspring = 200 bar
- Hydraulic counter pressure in the main port ➁ (T): phydraulic = 50 bar
⇒ Response pressure = pspring + phydraulic = 250 bar
Dimensions
Dimensions in mm
Mounting cavity: R/DBD . 2K; 2 main ports; thread M24 x 1.5
Dimensions in mm
| 1) | Depth of fit |
| 2) | Visual inspection |
Downloads
 | Pressure relief valve, direct operated Data Sheet | RE25715 | 2015-06-01 | English | PDF | 677k Product Groups: Direct operated, Relief and unloading valves Type DBD..K |
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