BOSCH REXROTH
R901082849
Pressure Reducing Valves
Pressure valves, KRD -size 02 serie 2x/
BOSCH REXROTH
MATERIAL: R901082849
SUMMARY: Pressure valves, KRD -size 02 serie 2x/
Due to extremely high demand, please call 888-651-5712 for availability
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) |
|
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 |
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! For further information and data on the use of other hydraulic fluids, please refer to data sheet 90220 or contact us! There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.)! Flame-resistant – containing water: The maximum pressure differential per control edge is 175 bar. Otherwise, there is increased cavitation erosion.Tank pre-loading < 1 bar or > 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 … 1,000 | ||
|
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 parameters, please consult us!
(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
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (A) |
Dimensions in mm
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (A) |
|
1.1 |
Adjustment type “1”: rotary knob (only with pressure rating 100 bar “F”) |
|
1.2 |
Adjustment type "2": grub screw with hexagon wrench size 5 and protective cap |
|
1.3 |
Adjustment type “3”: lockable rotary knob with scale (only with pressure rating 100 bar “F”) |
|
2 |
Plastic ring with marking (adjustment of the zero position after the valve has been screwed in, then fixing of the ring by horizontal shifting until it engages on the reducing piece) |
|
3 |
Lock nut wrench size 19, tightening torque MA = 30±5 Nm |
|
4 |
Lock nut wrench size 30, tightening torque MA = 100 Nm |
|
5 |
Space required to remove the key |
|
6 |
Hexagon wrench size 36, tightening torque MA = 170 Nm |
Mounting cavity R/ISO 7789-27-01-1-98 (similar to ISO 7789-27-01-0-98): 2 main ports, thread M27 x 2
Dimensions in mm
| 1) | Deviating from ISO 7789 27-01-0-98: Valves for mounting cavity ISO 7789 27-01-0-98 can be screwed into this bore! |
| 2) | Depth of fit |
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (A) |