BOSCH REXROTH
KAV2R2AA/AM
R901220869
Pressure Cut-off Pressure Valves
Pressure valves, KAV -size 02 serie 1x/
BOSCH REXROTH
MATERIAL: R901220869
SUMMARY: Pressure valves, KAV -size 02 serie 1x/
Due to extremely high demand, please call 888-651-5712 for availability
General information
Pressure valves type KAV are pilot-operated pressure cut-off valves with steplessly adjustable switching pressure differentials.
They basically consist of pilot control stage (1) and main stage (2).
Function
The pump flow (main port ➀) is introduced into the accumulator of the system via main port ➂. If the pressure at the actuator in main port ➂ exceeds the set top switching pressure, the connection to Y (main port ➃) and T (main port ➁) is opened and the pump flow is switched to depressurized circulation (➀ to ➁). If the pressure at the actuator in main port ➂ falls below the set bottom switching pressure, the connection to Y (main port ➃) and T (main port ➁) is closed and the pump flow is directed back into the accumulator of the system.
If used as accumulator charging valve, an additional check valve (7) is required to block the connection from main port ➂ to main port ➀ to prevent return flow of the accumulator volume.
If used for depressurized pump start-up, an additional bore Z is required in the mounting cavity (see mounting cavity) for use of port Z at the valve. Between Z and Y (main port ➃), a directional valve (8) is to be switched to enable remote-controlled shut-off (from main port ➀ to main port ➁) under the set switching pressure.
Setting the switching pressure differential:
Notice! At the factory, the valves are set at nominal pressure to a switching pressure differential of approx. 10 % to 12 %. A setting of 8 % to 50 % of the nominal pressure is possible.
On delivery, the adjustment spindle (3) is set to the minimum adjustable top switching pressure, i.e., the adjustment spindle is screwed out up to the limit stop. By screwing in the adjustment spindle (3), the top switching pressure may be increased. By screwing in the adjustment spindle (4), the bottom switching pressure is increased and the switching pressure differential reduced. Screwing out the adjustment spindle (4) reduced the bottom switching pressure and the switching pressure differential is increased. The pressure adjustment is secured by means of the clamping screw (6) and the lock nut (5).
Possible setting range, refer to characteristic curve "switching pressure differential".
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
1) Port Z can be applied in case of use for depressurized pump start-up in connection with a directional valve (see mounting cavity).
|
01 |
02 |
03 |
04 |
05 |
06 |
07 |
08 |
09 |
10 |
11 |
||
|
KAV |
2 |
2 |
A |
A |
/ |
A |
– |
V |
|
01 |
Pressure cut-off valve, pilot-operated |
KAV |
|
|
Adjustment type |
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|
02 |
Hexagon with protective cap |
2 |
|
|
Pressure rating |
|||
|
03 |
50 bar |
C |
|
|
100 bar |
F |
||
|
200 bar |
K |
||
|
350 bar |
R |
||
|
04 |
Component size |
2 |
|
|
05 |
4 main ports |
||
|
Symbol |
 |
A |
|
|
06 |
Component series |
A |
|
|
07 |
High Performance and mounting cavity R/KAV.2 (see circuit diagrams) |
A |
|
|
08 |
without pressure pre-adjustment |
no code |
|
|
with pressure pre-adjustment |
– |
||
|
with pressure pre-adjustment, sealed |
P |
||
|
09 |
top switching pressure in bar 1) |
... |
|
|
10 |
bottom switching pressure in bar → 1) |
... |
|
|
Seal material |
|||
|
11 |
FKM seals |
V |
|
| 1) Please enter values, refer to characteristic curve "switching pressure differential"; only required for version with pressure pre-adjustment ("–" or "P"): | |
| Pressure adjustment is realized at | |
| a pump flow of approx. 10 l/min | |
| actuator flow approx. 2 l/min |
general
|
Size |
2 | |
|
Weight |
kg |
0.42 |
|
Installation position |
any | |
hydraulic
|
Size |
2 | ||
|
Maximum operating pressure |
bar |
350 | |
|
Maximum set pressure |
Version "C" |
bar |
50 |
|
Version "F" |
bar |
100 | |
|
Version "K" |
bar |
200 | |
|
Version "R" |
bar |
350 | |
|
Maximum admissible return flow pressure |
Main port ➁ (T) |
bar |
200 |
|
Main port ➃ (Y) 1) |
bar |
100 | |
|
Maximum flow |
l/min |
140 | |
|
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 2) |
Class 20/18/15 according to ISO 4406 (c) | ||
|
Load cycles |
million |
10 | |
| 1) | Attention! The applied pressure adds to the set pressure! The switching pressure differential remains unchanged within the setting range! |
| 2) | 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 |
|
|
Mineral oil |
HL, HLP |
FKM, NBR |
DIN 51524 |
|
|
Bio-degradable |
Insoluble in water |
HEES (synthetic esters) |
FKM |
VDMA 24568 |
|
HETG (rape seed oil) |
FKM, NBR |
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|
Soluble in water |
HEPG (polyglycols) |
FKM |
VDMA 24568 |
|
|
Other hydraulic fluids on request |
||||
For applications outside these parameters, please consult us!
(measured at HLP46, ϑoil=50±5 °C)
Circulation pressure dependent on the pump flow qV P
Switching pressure differential (P → X)
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
|
1 |
Always keep open! Only close for maintenance! |
|
2 |
Always keep closed! Only open for maintenance! |
Circuit examples
Hydraulic system with pressure accumulator
Circuit examples
Hydraulic system with high- and low-pressure pump
Circuit examples
Hydraulic system with pressure accumulator with directional valve (not included in the scope of delivery!)
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
|
1 |
Always keep open! Only close for maintenance! |
|
2 |
Always keep closed! Only open for maintenance! |
Circuit examples
Hydraulic system with high- and low-pressure pump with directional valve (not included in the scope of delivery!)
Application note!
Reduce the tubing between pressure cut-off valve and hydraulic accumulator to a minimum!
Dimensions in mm
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
|
1 |
Hexagon SW32, tightening torque MA = 60 Nm |
|
2 |
Adjustment type "2", hexagon with protective cap SW19 |
|
3 |
Hexagon SW10 |
|
4 |
Internal hexagon SW3 |
|
5 |
Locating screw SW2 |
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
| 1) Port Z can be applied in case of use for depressurized pump start-up in connection with a directional valve (see mounting cavity). | |
| 1) With counterbore | |
| 2) Depth of fit | |
| 3) All O-ring insertion faces are rounded and free of burrs | |
| 4 Bore Z required in case of use for depressurized pump start-up in connection with a directional valve |
Mounting cavity R/KAV.2: 4 main ports; thread 1"-14 UNS-2B
Dimensions in mm
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
|
1 |
Hexagon SW32, tightening torque MA = 60 Nm |
|
2 |
Adjustment type "2", hexagon with protective cap SW19 |
|
3 |
Hexagon SW10 |
|
4 |
Internal hexagon SW3 |
|
5 |
Locating screw SW2 |
|
➀ |
Main port 1 (P) |
|
➁ |
Main port 2 (T) |
|
➂ |
Main port 3 (X, A) |
|
➃ |
Main port 4 (Y) |
| 1) With counterbore | |
| 2) Depth of fit | |
| 3) All O-ring insertion faces are rounded and free of burrs | |
| 4 Bore Z required in case of use for depressurized pump start-up in connection with a directional valve |
Tolerance for all angles ± 0.5 °