Артикул: RX7477
2-way pressure reducing valves, direct operated KRD (High Performance)
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Description
- Size 2
- Component series B
- Maximum operating pressure 400 bar
- Maximum flow 25 l/min
Features
- Cartridge valve
- Mounting cavity according to R/ISO 7789-27-01-1-98
- Available in 3 pressure ratings (100, 210 and 315 bar)
- Versatile use for simple pressure-reducing functions without leakage oil drain
Product description
General
The direct operated 2-way pressure reducing valve type KRD is designed as tight seat valve. It is used for the leakage-free pressure reduction of a working pressure.
It basically comprises the screw-in housing (1) with spring (6) and adjustment type (5) as well as spool (3), valve seat (2) and closing element (4).
Function
In the initial position, the valve seat is open. Hydraulic fluid can flow from the main port ① to ②. If the pressure in the main port increases ② to the pressure value set at the adjustment type (5), the closing element (4) closes the connection ① to ②. The increasing system pressure (main port ①) no longer influences the pressure in main port ② (pressure holding function). Pressure losses in the main port ② (actuator) will be compensated by the valve.
| ➀ | Main port 1 (P) |
| ➁ | Main port 2 (A) |
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | |
| KRD | 2 | A | B | / | L | V |
| 01 | Pressure reducing valve, direct operated | KRD |
| Adjustment type | ||
| 02 | Rotary knob | 11) |
| Grub screw with hexagon and protective cap | 2 | |
| Rotary knob with scale, lockable | 31) | |
| Pressure rating | ||
| 03 | 100 bar | F |
| 210 bar | L | |
| 315 bar | P | |
| 04 | Size | 2 |
| Design principle | ||
| 05 | Seat valve | A |
| 06 | Component series | B |
| 07 | High Performance and mounting cavity R/T-8A (see mounting cavity) | L |
| 08 | Without pressure pre-adjustment | no code |
| With pressure pre-adjustment 2) | -... | |
| 09 | FKM seals | V |
| 1) Only with pressure rating 100 bar (“F”) | |
| 2) Example (pressure adjustment when qV = 1 l/min up to 2 l/min): | |
| set to 50 bar: …/L-50V |
Technical data
general
| Size | 2 | |
| Weight | kg | 1 |
| Installation position | any | |
| Hydraulic fluid | Classification | Suitable sealing materials | Standards | |
| Mineral oils and related hydrocarbons | HL, HLP, HLPD, HVLP, HVLPD |
FKM | DIN 51524 | |
| Environmentally compatible | Insoluble in water |
HEES |
FKM | ISO 15380 |
|
HEPR | FKM | |||
| Soluble in water | HEPG | FKM | ISO 15380 | |
| Containing water | Water-free | HFDU, HFDR | FKM |
ISO 12922 |
| Containing water | HFAS | FKM | ISO 12922 | |
| Important information on hydraulic fluids!
Tank pre-loading 20 % of the pressure differential. The pressure peaks should not exceed the maximum operating pressures! | ||||
hydraulic
| Maximum operating pressure | Main port ① | bar | 400 | |
| Main port ② | bar | 315 | ||
| Nominal pressure in A | Adjustable minimum pressure in A | |||
| Maximum set pressure 1) | Pressure rating 100 bar | bar | 100 | 10 |
| Pressure rating 210 bar | bar | 210 | 20 | |
| Pressure rating 315 bar | bar | 315 | 30 | |
| Maximum flow | l/min | 25 | ||
| Maximum admissible leakage in the application/system | l/min | 1.5 | ||
| Hydraulic fluid | see table | |||
| Hydraulic fluid temperature range | °C | -20 … +80 | ||
| Viscosity range 2) | mm²/s | 5 … 1000 | ||
| Maximum admissible degree of contamination of the hydraulic fluid 3) | Class 20/18/15 according to ISO 4406 (c) | |||
| 1) | Exact pressure control at p > 20 bar is possible |
| 2) | preferably 10 to 100 mm2/s |
| 3) | 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 values, please consult us!)
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
Reduced pressure dependent on the flow
Notice!
The figures show the p-qV characteristic curves of the 3 pressure ratings at the relevant rated pressures.
Recommendation for the pressure differential:
Δp ≥ 20 bar
Flow resistance Δp-qV characteristic curves
Symbols/Circuit diagrams
load errorDimensions
load errorDownloads
 | 2-way pressure reducing valve, direct operated KRD Data Sheet | RE18111-03 | 2021-05-04 | English | PDF | 428k Product Groups: Direct operated, Pressure reducing and relieving Size 2, Series B |
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