axial piston variable pump kvaa - airline hydraulics · pdf fileservice line ports 11 ... 2/16...

Linear Motion andAssembly Technologies ServicePneumaticsHydraulics

Electric Drives and Controls

Features– Variable pump with axial tapered piston rotary group of bent

axis design. Designed especially to meet the requirements of commercial vehicles.

– The output flow is proportional to the drive speed and pump displacement and is steplessly variable between maximum and zero (qv max to qv min = 0).

– Favourable power/weight ratio, small overall dimensions, optimum efficiency and economic design

– Self aspirating, for open circuit operation

– Flange and shaft designed for direct mounting on truck gear-box PTO‘s

Series 6Sizes 55 ... 107Nominal pressure 4350 psi (300 bar)Peak pressure 5100 psi (350 bar)for commercial vehicles, open circuit

RA 92250/02.07 /16Replaces: 02.04Axial Piston Variable Pump

KVAA

Technical data sheet

ContentsOrdering Code / Standard Program 2

Technical Data 3

DRS - Pressure Control with Load Sensing 6

EP - Electric Control with Proportional Solenoid 7

Unit Dimensions, Size 55 (ISO version) 8

Unit Dimensions, Size 80 (SAE version) 10

Unit Dimensions, Size 107 (SAE version) 12

Installation Notes 14

General Notes 15

Ordering Code / Standard Program

Axial piston unit

01Bent axis design, variable, nominal pressure 4350 psi (300 bar), peak pressure 5100 psi (350 bar), for commercial vehicles (truck) KVAA7V

Operation mode02 Pump in open circuits O

Size

03 ≈ Displacement Vg max in (cm3) size 55* 80 07

in3/rev. 3.55 4.88 6.53

Control devices 55* 80 07

04

Pressure control with load sensing DRSElectric control with proportional solenoid U = 24 V positive characteristics – – EP2

negative characteristics – – EP4

Series05 6

Index06 3

Direction of rotation

07Viewed on shaft end clockwise R

counter-clockwise L

Seals 55* 80 0708 FKM (2 back to back shaft seals) M

Shaft end

09

Splined shaft ANSI B92.1a-1976 – S

Parallel keyed shaft SAE – – K

Splined shaft similar DIN ISO 14 (for truck use) – – E

Mounting flange

102-bolt – SAE J744 – C

Special flange ISO 7653-1985 (for truck use) – – K

Service line ports

11Threaded port A(B), rear (UN) – 67

Threaded port A(B), rear (ISO) – – 64

= available – = not available = in preparation, available on requiry

* = Size 55 currently in ISO version only (KVA7VO55), consult factory for availability of SAE version.

KVAA7V O / 6 3 – M01 02 03 04 05 06 07 08 09 10 11

2/16 Bosch Rexroth Corp. KVAA RA 92250/02.07

Technical DataHydraulic fluidBefore starting project planning, please refer to our data sheets RE 90220 (petroleum oil) and RE 90221 (environ-mentally acceptable hydraulic fluids) for detailed information regarding the choice of hydraulic fluids and conditions of use.

If environmentally acceptable hydraulic fluids are being used, the limitations regarding technical data and seals mentioned in RE 90221 must be observed.

When ordering please indicate the hydraulic fluid used.

Attention: For the operation with water-containing HF-fluids the variable pump KVAA is not suitable.

Viscosity range

We recommend that a viscosity (at operating temperature) for optimum efficiency and service life purposes of

νopt = opt. operating viscosity 80...170 SUS (16...36 mm2/s)

be chosen, taken the tank temperature (open circuits) into account.

Limits of viscosity range

The following values apply in extreme cases:

νmin = 42 SUS (5 mm2/s) short term (t < 3 min.) at max. permitted temperature tmax = 240°F (115°C).

νmax = 7400 SUS (1600 mm2/s) short term (t < 3 min.) with cold start (p < 435 psi (30 bar), n ≤ 1000 rpm, tmin = -13°F (-25°C)).

Note that the maximum hydraulic fluid temperature of 240°F (115°C) must not be exceeded locally either (e.g. bearing area). The temperature in the bearing area is - depending on pressure and speed - up to 22°F (12 K) higher than the average case drain temperature.

This axial piston unit can not be operated in a temperature range of less than -13°F (-25°C).

Selection diagram

VG 22VG 32VG 46VG 68VG 100

opt.

80 (16)

170 (36)

(0) (20) (40) (60) (80) (100)(-40) (-20)

42 (5)

7400 (1600)

visco

sity

SU

S (m

m2 /

s)

fluid temperature range t in °F (°C)tmin = -40°F (-40°C)

tmax = +240°F (+115°C)

(-40) (-25) (-10) (0) (10) (30) (50) (70) (90) (115) (°C)

°F-40 -13 1200 20 40 60 80 160 195 240

(1600)(1000)(600)(400)

(200)

(100)

(60)

(40)

(20)

(10)

(5)

7000500030002000

1000

500

300

150200

100807060

50

40

Details regarding the choice of hydraulic fluid

The correct selection of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient tempera-ture, in an open circuit the tank temperature.

The hydraulic fluid should be selected so that within the operating temperature range, the operating viscosity lies within the optimum range (νopt) (see shaded section of the selection diagram). We recommend that the highest possible viscosity range should be chosen in each case.

Example: At an ambient temperature of X° C an operating tem-perature of 140°F (60° C) is set in the circuit. In the optimum viscosity range (νopt; shaded area) this corresponds to the viscosity classes VG 46 or VG 68; to be selected: VG 68.

Please note: The case drain temperature, which is affected by pressure and rotational speed, is always higher than the tank temperature. At no point in the system may the temperature be higher than 240°F (115°C).

If this cannot be achieved due to unusual operating parameters or high ambient temperatures, please contact us.

FiltrationThe finer the filtration, the cleaner the fluid and the longer the service life of the axial piston unit.

To ensure proper function of the axial piston unit, the hydraulic fluid must have a cleanliness level of at least

20/18/15 according to ISO 4406.

At very high hydraulic fluid temperatures (194°F (90°C) to max. 240°F (115°C)), a cleanliness level of at least

19/17/14 according to ISO 4406 is required.

Please contact us, if these cleanliness levels cannot be achie-ved.

RA 92250/02.07 KVAA Bosch Rexroth Corp. 3/16

Technical DataOperating pressure rangeInlet

Pressure at port S

The minimum inlet pressure depends on the speed. The following limits may not be exceeded.

pabs min _______________________________12 psi (0.8 bar)

The maximum pressure pabs max also depends on speed (see succeeding diagram).

Minimum inlet pressure at suction port S with increased speed

In order to avoid damage of the pump a minimum inlet pressure at the suction port must be assured. The minimum inlet pres-sure is related to the rotational speed and the displacement of the variable pump.

bar psi

0.6 0.7 0.8 0.9 1.0

2.0 301.9 281.8 261.7 251.6 231.5 221.4 201.3 191.2 171.1 161.0 150.9 130.8 12

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

n nm

ax 1

VgVg max

Displacement

Inle

t pre

ssur

e p a

bs in

psi

(ba

r)

Spe

ed

Note:

– max. permissible speed nmax perm. (speed limit, see page 5)

– min. and max. permissible inlet pressure at port S

Outlet

Maximum pressure at port A or B (pressure specifications in according to DIN 24312)

Nominal pressure pN ________________4350 psi (300 bar)

Peak pressure pmax _________________ 5100 psi (350 bar)

Please note: Size 80 with shaft end S: pN _________3350 psi (230 bar)

Case drainThe case of the pump is connected to the inlet port. A separate case drain is therefore not required (purge port R is plugged)

Exception:

When using the DRS control a separate drain line from port T to the tank is mandatory (not required for EP control).

Temperature rangeThe FKM shaft seal ring is admissible for a case temperature range from -13°F (-25°C) bis 240°F (+115°C).

Note: This axial piston unit can not be operated in a temperature range of less than -13°F (-25°C).

Direction of flow

Direction of rotation, viewed on shaft endclockwise counter-clockwise

S to B S to A

Determining the size

Flow qv =Vg • n • ηv

gpm231

(qv =Vg • n • ηv

L/min )1000

Torque T = Vg • Δp

lb-ft24 • π • ηmh

(T = Vg • Δp

Nm )20 • π • ηmh

Power P =2 π • T • n

=qv • Δp

HP33000 1714 • ηt

(P =2 π • T • n

=qv • Δp

kW )60000 600 • ηt

Vg = Displacement per revolution in in3 (cm3)

Δp = Differential pressure in psi (bar)

n = speed in rpm

ηv = Volumetric efficiency

ηmh = Mechanical-hydraulic efficiency

ηt = Overall efficiency


Table of values (theoretical values, without efficiencies and tolerances; values rounded)

Size 553) 80 07Displacement Vg max in3 3.34 4.88 6.53

cm3 54.8 80 107Speed max. 1)

at Vg max nmax1 rpm 2500 2240 2150at Vg < 0,74 • Vg max (see diagram, page 4) nmax2 rpm 3400 3000 2900

Speed max. 2) nmax perm. rpm 3750 3350 3200Flow at nmax 1 and Vg max qv max 1 gpm 36 47 61

L/min 137 179 230Power at qv max 1 and Δp = 4350 psi (300 bar) Pmax 1 HP 91 121 154

kW 68 90 115Torque at Vg max and Δp = 4350 psi (300 bar) T lb-ft 193 282 376

Nm 261 382 510Mass moment TG lb-ft 15.5 21.0 30.2

Nm 21 28.5 41Moment of inertia (of the rotating parts) J lb-ft2 0.0806 0.1518 0.2419

kgm2 0.0034 0.0064 0.0102Filling capacity V gal 0.158 0.211 0.317

L 0.6 0.8 1.2Mass (approx.) m lbs 35 44 52.9

kg 16 20 241) The values shown are valid for an absolute pressure pabs = 15 psi (1 bar) at the suction port S and when operated on mineral fluid with a specific mass of 7.36 lbs/gal (0,88 kg/L). 2) Maximum speed (speed limit) for an increase in the inlet pressure pabs at the suction port S and Vg < Vg max 3) Metric version (further information see RE 92250)

Permissible axial loading on the drive shaftThe values given are maximum values and do not apply to continous operation. For drives with radial loading (pinion, V-belt drives), please contact us!

Size 55 80 07

when stopped or when axial piston unit working in pressureless conditions

± Fax maxlb 0 0 0N 0 0 0

Axial force / operating pressure

Fax–

+

+ Fax zul.

− Fax zul.

N/psi 0.13 0.16 0.20N/bar 8.7 10.6 12.9N/psi -1.02 -1.32 -1.58N/bar -66 -86 -103

When considering the permissible axial force, the force-transfer direction must be taken into account:

− Fax max = increase in service life of bearings + Fax max = reduction in service life of bearings (avoid if at all possible)

Technical Data


DRS - Pressure Control with Load SensingFunction of the pressure controlThe pressure control keeps the pressure in a hydraulic system constant within its control range even under varying flow condi-tions. The variable pump only moves as much hydraulic fluid as is required by the actuators. If the operating pressure exceeds the setpoint set at the integral pressure control valve, the pump displacement is automatically swivelled back until the pressure deviation is corrected.

In zero pressure non-running condition, the pump is swivelled to its starting position Vg max by means of the control spring.

Setting range for pressure control ___________________ 1150 to 4650 psi (80 to 320 bar)

Standard setting: ___________________4350 psi (300 bar)

Note: Any pressure relief vlave included in the circuit to limit the max. pressure must be set to a cracking pressure at least 290 psi (20 bar) above the pressure control setting.

The pressure control is superimposed on the load sensing valve, i.e. the load sensing function operates below the set pressure.

Load sense functionThe load sensing control is a flow control option that operates as a function of the load pressure to regulate the pump dis-placement to match the actuator flow requirement.

The flow depends here on the cross section of the external sensing orifice (1) fitted between the pump outlet and the actuator. The flow is independent of the load pressure below the pressure cut-off setting and within the control range of the pump.

The sensing orifice is usually a separately arranged load sensing directional valve (control block). The position of the directional valve piston determines the opening cross section of the sensing orifice and thus the flow of the pump.

The load sensing control compares pressure before and after the sensing orifice and maintains the pressure drop across the orifice - and therefore the pump flow - constant as a function of the orifice size.

If the differential pressure Δp increases, the pump is swivel-led back towards Vg min and, if the Δp decreases the pump is swivelling out towards Vg max until the pressure drop across the sensing orifice in the valve is restored.

Δporifice = ppump – pactuator

Setting range for Δp: ________275 ... 580 psi (19 ... 40 bar)

Standard setting: _____________________ 435 psi (30 bar)

The stand-by pressure in zero stroke operation (sensing orifice plugged) is slightly above the Δp setting.

(1) The sensing orifice (control block) is not included in the pump supply.

Characteristic DRS

5100(350)

725(50)

max

. 145

psi

(

10 b

ar)

min

max

Displacement

Ope

ratin

g pr

essu

re p

B in

psi

(ba

r)

Vg min Vg max

Circuit diagram DRS

R

X T

A (B)Vg min Vg max A1

R1

S

(1)

Zero stroke operationThe standard pump unit is designed for intermittent constant pressure operation. Short-term operation at zero stroke (< 10 min.) is permissible up to a operating pressure pmax = 4350 psi (300 bar) at a tank temperature of ≤ 122°F (50°C).

Note: When using the DRS control a drain line is mandatory from the T port to tank to maintain thermal stability.

When ordering, state in clear text:

- Setting of the pressure control - Δp - setting of the load sensing function

(If there is no clear specification, pump will be delivered with standard setting, see above.)


EP - Electric Control with Proportional SolenoidWith the electrical control with proportional solenoid, the pump displacement is adjusted proportionally to the solenoid current, resulting in a magnetic control force, acting directly onto the control spool that pilots the pump control piston.

EP2 - Starting position in unpressurised state at Vg min. EP4 - Starting position in unpressurised state at Vg max.

Charactreristic EP

800

700

600

500

400

300

200

100

0 0,2 0,4 0,6 0,8 1,0 Vg min Vg max Displacement

Con

trol

cur

rent

I in

mA

EP2

EP4

Note: For submerged in-tank installation when using the EP control, only the mineral hydraulic fluids can be used with the fluid temperature limited to 176°F (80°C).

To control the proportional solenoids the following electronic amplifier and controller are available (also as to the Internet under www.boschrexroth.com/mobile-electronic):

– BODAS controller RC (RE 95200) and application software

– Analog amplifier RA (RE 95230)

By using an proportional amplifier control of swivel time is also possible.

Technical data of solenoids

EP2 EP4

Sizes 55 107

Voltage 24VDC +20% 24VDC +20%

Control current

Start of control Vg min 200 mA Vg max 200 mA

End of control Vg max 600 mA Vg min 600 mA

Limiting current 0,77 A 0,68 A

Nominal resistance (at 68°F (20°C))

22,7 Ω 24,2 Ω

Dither frequency 100 Hz 100 Hz

Duty cycle 100 % 100 %

Type of protection IP 65 IP 54

Connector

Hirschmann to DIN EN

175 301 - 803-A / ISO 4400

AMP- Junior Timer

2 pin

Circuit diagram

EP2 (Size 55)

R

A (B) Vg max Vg min

A1

R1

S

EP4 (Size 107)

R

A (B) Vg min Vg max

A1

R1

S

Note

The spring centering in the pilot control unit is not a safety device

Through contamination in the control unit – e.g. in hydraulic fluid, wear particles, or particles out of a system – the valve spool can get stuck in an undefined position. In this case, the pump flow does not follow the command inputs of the machi-ne operator anymore.

– Make sure that a proper emergency shut down function can bring the driven machine movements to a safe position immediately (e.g. stop).

– Maintain the specified cleanliness level 20/18/15 (<194°F (90°C)) or 19/17/14 (>194°F (90°C)) to ISO 4406.


Unit Dimensions, Size 55 (ISO version) Before finalizing your design, please request ap-proved installation drawing. Dimensions in inches and (millimeters).

DRS Pressure control, with load sensing

View: clockwise rotation

*) center of gravity

View Y counter-clockwise rotation

View Y clockwise rotation

1A1R 1R

TX

S A

T

1A

X

R

Y

1A

TX

B S

1R

(91)

(229)

R4.72(R120)

0.67

(10*

))

(113

)

0.55

(105)4.13

(40)1.57

(12)0.47

G3/

4

G1

(118)4.65(27.5) (27.5)1.08 1.08

-0.0

5-0

.03

(DIA

80

)

DIA

3.14

7D

IA3.

148

± 0.4(110 )4.3144.346

(105

)

(80)

4.45

4.133.15

(80)3.15

DIA

0.51

(DIA

13)

(122

)

(120

)

(110

)

4.80

4.72

4.33

(32)

0.39

1.26

12°3

0' (76)

(180

)

3.582.

99

7.091.54

(39)

0.35(9)

0.59(15)

(156)

(130*))

(214)

(267)

6.14

5.12

8.43

10.51

(242)

(232)

9.02

9.53

9.13

(14)

(17)


Unit Dimensions, Size 55 (ISO version)EP2 Electric control, with proportional solenoid

1A

1R

R

Y

1R1A

B S

1R 1A

AS

5.16

(131

)

10.87 (276)

Shaft end

E Splined shaft similar DIN ISO 14 8x32x35 pN = 4350 psi (300 bar)

PortsA, B Service line ports (high pressure series) DIN ISO 228 G 3/4, 16 deep 243 lb-ft 2) 330 Nm2)S Suction port DIN ISO 228 G 1; 18 deep 354 lb-ft 2) 480 Nm2)T Case drain (only DRS) ISO 6149 M12x1,5; 12 deep 37 lb-ft 2) 50 Nm2)A1 Gauge port - high pressure 3) ISO 6149 M10x1; 8 deep 22 lb-ft 2) 30 Nm2)R1 Gauge port - suction pressure 3) ISO 6149 M10x1; 8 deep 22 lb-ft 2) 30 Nm2)R Air bleed 3) ISO 6149 M18x1,5 44 lb-ft 2) 60 Nm2)X Port for Δp control (load sensing) ISO 11926 7/16-20UNF-2B; 11,5 deep 30 lb-ft 2) 40 Nm2)1) centering bore according to DIN 332 (thread according to DIN13)2) please observe the general notes for the max. tightening torques on page 15.3) plugged

(1)(2)

Before finalizing your design, please request ap-proved installation drawing. Dimensions in inches and (millimeters).

View Y counter-clockwise rotation


Note: The position of the plug can be changed by turning the solenoid body.

Note the following procedure: 1. Loosen the fastening nut (1) 2. Turn the magnet body (2) to the desired position 3. Tighten the fastening nut Tightening torque of fastening nut: 3.69+0.73 lb-ft (5+1 Nm) (width across flat 26 mm, double hexagon DIN 3124)

0.37(9.5)

0.47(12)

1.45(36.8)

DIA1

.370

DIA1

.374

(DIA

34.9

-0.1)

M12

x1.75

1 )2 )

(26.1)1.03

0.94(24)

2.17(55)

DIA0

.32

(DIA

8.1)

groove for retaining ring 35x1.5 DIN 471


Unit Dimensions, Size 80 (SAE version)DRS Pressure control, with load sensing




1A1R

TX

AS

T

1A

1R

X

R

Y

1A 1R

TX

B S

4.61 (117)

6.85

(174

)

5.75

(146

)

DIA 0.56(DIA 14.3)

0.59(15)

DIA

3.99

86D

IA3.

9972

(DIA

101.

6

)

-0.0

36-0

.071

4.13 (105)

1.57 (40)

0.47 (12)

1 5/

16-1

2UN

-2B

1 5/

8-12

UN

-2B

5.04 (128)

1.18(30)

1.18(30)

5.04

(128

)

4.96

(126

)

4.57

(116

)

4.06

(103

)

3.39

(86)

(36)

1.42

12°3

0'

7.68

(195

)

7.28 (185)

9.57 (243)

11.65 (296)

10.63 (270)

10.04 (255)

10.20 (259)

(9.7)0.38

0.55(14)

0.71(18)

View Y conter-clockwise rotation



Unit Dimensions, Size 80Shaft end

S Splined shaft 1in 15T 16/32DP 1) (SAE J744 – 25-4 (B-B)) pN = 3350 psi (230 bar)

K Keyed shaft 1 1/4in 1) (SAE J744 – 32-1 (C)) pN = 4350 psi (300 bar)

DIA

2.83

(DIA

72)

3/8

-16U

NC

-2B

1.50(38)

0.31(8)

0.30(7.5)

(DIA

35)

DIA

1.38

0.87(22)

1.81(46)

2.20(56)

1.89(48)

(DIA

35)

DIA

1.38

0.75(19)

(5/1

6-18

UN

C-2

B)

(DIA

31.7

5 -0.

03)

DIA

1.25

0D

IA1.

248

0.24(6)

1.39

(35.

3)

1.38

(35.

2)

(7.94+0.03)

0.31370.3125

PortsA, B Service line ports (high pressure series) ISO 11926 1 5/16-12UN-2B; 0.79 deep 400 lb-ft 2)S Suction port ISO 11926 1 5/8-12UN-2B; 0.79 deep 710 lb-ft 2)T Case drain (only DRS) ISO 11926 9/16-18UNF-2B 60 lb-ft 2)A1 Gauge port - high pressure 3) ISO 11926 7/16-20UNF-2B 30 lb-ft 2)R1 Gauge port - suction pressure 3) ISO 11926 7/16-20UNF-2B 30 lb-ft 2)R Air bleed 3) ISO 11926 3/4-16UNF-2B lb-ft 2)X Port for Δp control (load sensing) ISO 11926 7/16-20UNF-2B 30 lb-ft 2)1) ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 52) please observe the general notes for the max. tightening torques on page 15.3) plugged


RA 92250/02.07 KVAA Bosch Rexroth Corp. /16

Unit Dimensions, Size 107 (SAE version)DRS Pressure control, with load sensing




View Y conter-clockwise rotation


T

B S

1A1R

XT

T

R

X

AS

1A1R

X

Y

1A

1R

8.39

(213

)

7.13

(181

)

(18)0.71

5.83 (148)

5.28 (134)

12.36 (314)

11.38 (289)

10.47 (266)

10.67 (271)

10.12 (257)

5.20

(132

)

7.80 (198)

8.11

(206

)

1.57

(40)

5.28

(134

)

3.58

(91)

4.33

(110

)

12°3

0'

4.88

(124

)

(12.7)0.50

(15)0.59

-0.0

83

DIA

4.99

67-0

.043

DIA

4.99

83

(DIA

127

)

1 5/

8-12

UN

-2B

1 5/

16-1

2UN

-2B

5.47 (139)(31.5)1.24

(31.5)1.24

(13)0.51 (40)

1.57

4.13 (105)


Unit Dimensions, Size 107Shaft end

S Splined shaft 1 1/4in 14T 12/24DP1) (SAE J744 – 32-4 (C)) pN = 4350 psi (300 bar)

DIA

3.15

(DIA

80)

7/16

-14U

NC

-2B

1.57(40)

0.31(8)

0.37(9.5)

(DIA

40)

DIA

1.57

1.10(28)

2.20(56)

PortsA, B Service line ports (high pressure series) ISO 11926 1 5/16-12UN-2B; 0.79 deep 400 lb-ft 2)S Suction port ISO 11926 1 5/8-12UN-2B; 0.79 deep 710 lb-ft 2)T Case drain (only DRS) ISO 11926 9/16-18UNF-2B 60 lb-ft 2)A1 Gauge port - high pressure 3) ISO 11926 7/16-20UNF-2B 30 lb-ft 2)R1 Gauge port - suction pressure 3) ISO 11926 7/16-20UNF-2B 30 lb-ft 2)R Air bleed 3) ISO 11926 3/4-16UNF-2B lb-ft 2)X Port for Δp control (load sensing) ISO 11926 7/16-20UNF-2B 30 lb-ft 2)1) ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 52) please observe the general notes for the max. tightening torques on page 15.3) plugged



General

During commissioning and operation, the axial piston unit must be filled with hydraulic fluid and air bled. This is also to be ob-served following a relatively long standstill as the system can be drained through the hydraulic lines.

The case is connected to the inlet port S. A seperate case drain to tank is not required.

Exception: version with DRS control. When using the DRS control a drain line from port T to tank is mandatory to maintain thermal stability.

In all operating conditions, the suction and drain line must flow into the tank below the minimum fluid level. The minimum suction pressure at port S must not fall below 12 psi (0,8 bar) absolute.

Installation position

As to the examples mentioned below.

Installation below the tank (standard)

Pump below minimum fluid level in tank.

Recommendation installation position: 1 and 2.

Installation above the tank

Pump above minimum fluid level in tank.

- Note: - max. perm. suction height hmax = 31.50 in (800 mm)

- min. perm. suction pressure at port S

2 3 4

Installation position

Air bleed Filling Installation position

Air bleed Filling

1 R S 3 R (L2) S (L2)

2 R1 S 4 R1 (L2) S (L2)

T

S

R

L2

T

S

R1A1

R

L2T

S

R

L2

T

S

R1A1

R

L2T

S

R

T

S

R1A1

R

T

S

R

T

S

R1A1

R

Installation Notes


– The KVAA pump is designed to be used in open circuits.

– Project planning, assembly and commissioning of the pump require the involvement of trained personnel.

– The working and functional ports are only designed to accommodate hydraulic piping.

– There is a danger of burns from the pump and especially the solenoids during and shortly after operation. Suitable safety precautions, e.g. protective clothing plan.

– The characteristic curve may shift depending on the operating status (operating pressure, fluid temperature) of the pump.

– Tightening torques: - The tightening torques specified in this data sheet are maximum values and may not be exceeded (maximum value for screw thread). Manufacturer specifications for the max. permissible tightening torques of the used fittings must be observed! - For DIN 13 fastening screws we recommend checking the tightening torque individually according to VDI 2230 Edition 2003.

– The data and information contained herein must be adhered to.

General Notes



© 2007 Bosch Rexroth Corporation

All rights reserved. Neither this document, nor any part of it, may be reproduced, duplicated, circulated or disseminated, whether by copy, electronic format or any other means, without the prior consent and authorization of Bosch Rexroth Corp.

The data and illustrations in this brochure/data sheet are intended only to descri-be or depict the products. No representation or warranty, either express or im-plied, relating to merchantability or fitness for intended use, is given or intended by virtue of the information contained in this brochure/data sheet. The information contained in this brochure/data sheet in no way relieves the user of its obligation to insure the proper use of the products for a specific use or application. All products contained in this brochure/data sheet are subject to normal wear and tear from usage.

Subject to change.

Bosch Rexroth CorporationMobile HydraulicsAxial & Radial Piston Units8 Southchase CourtFountain Inn, SC 29644-9018, USATelephone (864) 967-2777Facsimile (864) 967-8900www.boschrexroth-us.com

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