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Axial Piston Variable Pump A7VK Metering Pump for Polyurethane Components

RE 94010/10.10 1/16 Replaces: 03.09

Data sheet

Series 10 Sizes 12, 28 Nominal pressure 250 bar Maximum pressure 315 bar Open and closed design Features

Contents Ordering code for standard program Technical data MA control Dimensions size 12, open design Dimensions size 12, closed design Dimensions size 28, open design Dimensions size 28, closed design High-pressure relief valve, direct operated Installation instructions General instructions

2 3 5 6 8 10 12 14 15 16

–– Compact design –– Reduced dimensions and mass in comparison to A2VK –– Mounting flange, drive shaft and functions identical to A2VK, size 12 and 28, thus easy to replace –– Increased corrosion protection through special surface treatment –– Manual adjustment with precision display and clamp unit to prevent accidental adjustment –– Double shaft sealing made of special material and flushing chamber to identify damage and protect the environment –– Improved volumetric efficiency through robust rotary group using proven axial tapered piston technology –– Optionally available with mounted high-pressure relief valve –– Low noise level With open design (A7VKO) –– The case interior is connected to the suction chamber. A case drain line between the case and reservoir is not required Wiht closed design (A7VKG) –– High permissible filling pressure for highly-viscous media or hydraulic fluid by separating the filling channel and pump case –– Separate case drain line required Note The axial piston pump is approved for pumping polyurethane components (polyol and isocynate).


2/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

Ordering code for standard program A7VK 01

MA 02

03

/

04

10

M

05

06

S 07

08

5 09

10

11

– 12

13

Axial piston unit A7VK

01 Variable bent-axis design, nominal pressure 250 bar, maximum pressure 315 bar

02

Operation mode Pump, closed design

G

Pump, open design

O

Size (NG) 012

03 Theoretical displacement, see table of values on page 4

028

Control device MA

04 Control, manual with handwheel

Series 10

05 Series 1, index 0

Version of port and fixing threads M

06 Metric

07

Direction of rotation Viewed from drive shaft

clockwise, standard

R

counter-clockwise, option

L

Seals S

08 FKM (fluor-caoutchouc), PTFE (polytetrafluor ethylene)

Mounting flange Similar to ISO 3019-2 – 4-bolt 09 (can be changed to A2VK)

10

11

12

13

Drive shaft Parallel keyed shaft according to DIN 6885

012 80-4

028 –

100-4

L4

012

P3 P5

ø20

028 –

ø25

Service line ports Closed design, threaded ports A and B, at side, opposite side Open design, threaded ports A and S, at side, opposite side Pressure relief valves Without, standard With high-pressure relief valve, direct operated, optional Standard / special version Standard version Special version

Note Short designation X on a feature refers to a special version not covered by the ordering code.

= Available

– = Not available

K4

5

0 A

0 S


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

3/16

Technical data Hydraulic fluid The pump is approved for pumping and metering polyurethane components (polyol and isocynate). For other hydraulic fluids, consult with Rexroth Service.

Operating viscosity range The limiting values for viscosity are as follows: νmin_ _________________________________________ 5 mm2/s,

Closed design Pressure at service line ports A or B (inlet) Minimum filling pressure_____________________ 1 bar absolute Maximum filling pressure____________________30 bar absolute Depending on viscosity and flow, the filling pressure must be adjusted in such a way that a complete filling of the low pressure side of the pump is ensured.

νmax_______________________________________ 1600 mm2/s

Open design Pressure on suction port S (inlet)

Please contact us if different values are required.

Minimum filling pressure_____________________ 1 bar absolute

Optimum operating temperature range t__________ 10 to 50 °C Maximum operating temperature tmax__________________ 80 °C The permissible operating temperature is dependent on the lubricity of the respective hydraulic fluid. The maximum operating temperature must not be exceeded even locally.

Filtration of the fluid The filter should be arranged so that only filtered fluid enters the pump. The finer the filter, the longer the service life of the axial piston pump. We recommend a filter grade habs_________________ ≤ 125 µm

Operating pressure range Pressure at the service line ports A or B Nominal pressure pnom__________________ 250 bar absolute Maximum pressure pmax _ ________________ 315 bar absolute Single operating period _____________________________ 10 s Total operating period ______________________________ 50 h Minimum pressure (high-pressure side) ____________10 bar for lower pressure, please contact us.

Maximum filling pressure_____________________ 6 bar absolute Depending on viscosity and flow, the filling pressure must be adjusted in such a way that a complete filling of the low pressure side of the pump is ensured. Definition Nominal pressure pnom The nominal pressure corresponds to the maximum design pressure. Maximum pressure pmax The maximum pressure corresponds to the maximum operating pressure within the single operating period. The sum of the single operating periods must not exceed the total operating period. Minimum pressure (high-pressure side) Minimum pressure on the high-pressure side (A or B) that is required in order to prevent damage to the axial piston unit. Rate of pressure change RA Maximum permissible rate of pressure build-up and pressure reduction during a pressure change over the entire pressure range. Pressure p

Operating temperature range

Single operating period

t1

t2

tn

Maximum pressure pmax Nominal pressure pnom

Rate of pressure change RA max _______________ 9000 bar/s

Pressure p

pnom Dt Minimum pressure (high-pressure side)

Dp

Time t Total operating period = t1 + t2 + ... + tn Time t


4/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

Technical data Table of values

(theoretical values, without efficiency and tolerances; values rounded) Size

NG

12

28

Displacement, geometrical

Vg max Vg min

cm3 cm3

11.6 0

28.1 0

n = 1500 rpm n = 1800 rpm

qv max

l/min l/min

17.4 20.9

42.2 50.6

n = 1500 rpm n = 1800 rpm

Pmax

kW kW

7.3 8.7

17.6 21.1

Torque at Dp = 250 bar and Vg max

Tmax

Nm

46.2

111.8

Mass (approx.)

m

kg

11.7

22.1

Flow at Vg max and speed n Power at Δp = 250 bar, Vg max and speed n

Case drain fluid Closed design Maximum case drain pressure pL max___________________6 bar The pump ports A and B are separated from the case interior. The case drain fluid must be removed via port T1 or T2 using a separate line. Open design The case interior is connected to the suction chamber. The pressure on port S is also applied in the case and must not exceed 6 bar. A case drain line between the case and reservoir is not required (port T1, T2 plugged).

Determining the size Flow

qv =

Torque

T =

Power

P =

Vg • n • ηv

[L/min]

1000 Vg • Δp

[Nm]

20 • π • ηmh 2π•T•n 60000

=

Shaft seal ring Permissible pressure loading

Vg

= displacement per revolution in cm3

The service life of the shaft seal ring is affected by the speed of the pump, the case drain pressure and the properties of the medium being pumped. It is recommended that the continuous case drain pressure of 6 bar absolute at operating temperature not be exceeded. Short-term (t < 0.1 s) pressure spikes of up to 10 bar absolute are permitted. The service life of the shaft seal ring decreases with an increase in the frequency of ­pressure spikes.

Δp

= differential pressure in bar

n

= speed in rpm

ηv

= volumetric efficiency

ηmh

= mechanical-hydraulic efficiency

ηt

= total efficiency (ηt = ηv • ηmh)

Note For monitoring the shaft seal rings for zero leakage, we recommend connecting a barrier fluid monitor at ports U1 to U4. The minimum case pressure must be equal to or greater than the barrier fluid pressure. In addition, the barrier fluid pressure must be equal to or greater than the external pressure on the outer shaft seal ring.

qv • Δp 600 • ηt

[kW]


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

5/16

MA control Flow direction

Turning the handwheel turns a threaded spindle which steplessly adjusts the pumpâ&#x20AC;&#x2122;s rotary group, and thus the flow in the range from Vg min to Vg max.

Direction of rotation, viewed from drive shaft

A manual locking device, which is fitted as standard equipment, prevents unintentional adjustment. The precision adjustment display is integrated in the handwheel. Size

12

Rotation on the handwheel Vg min to Vg max

approx. Us

Design

clockwise

counter-clockwise

Closed

A to B

B to A

Open

S to A

S to A

28

23.4 30

Maximum torque on the handwheel Tmax approx. Nm 3.5

3.5

Closed design

Open design

Circuit diagram clockwise

Circuit diagram clockwise

U1

U

U3

T1

U2

U4

B

U2

T2

U4

Vg max

Vg max

A

U3

T1

U3

T1

Vg min

T2

U

U

Vg min

Circuit diagram counter-clockwise

U1

U1

U2

T2

A

S

Circuit diagram counter-clockwise

U4

A

U1

U

U3

T1

U4

Vg min

Vg min

Vg max

Vg max

B

U2

T2

A

S


6/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

Dimensions size 12

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Open design Direction of rotation clockwise

210 171 145 125

45°

45°

851)

5.5 49

51

163 69 74

57

49

S

A

100

U2

53

T1

5.51)

U

U3

16

U1

U4

12.5 °

14

T2

A M8

80

ø100

Direction of rotation counter-clockwise ø100

View Z

Direction of rotation clockwise ø100

U3

U3

125

Z S

A

S

A

S

16

ø79.8

38.5 38.5

ø80-0.074

51 39

0.51)

0.51) 66

66

66

66

1) Center of gravity


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

Dimensions size 12

7/16

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Drive shaft P3

Parallel keyed shaft to DIN 6885, A6x6x25.5

6

ø28

M6 x 11) 2)

ø20 +0.015 - 0.002

22.5

16

30

Ports Designation Port for

Standard4)

Size2)

Maximum pressure [bar]3)

State

A

Service line

DIN 3852

M22 x 1.5; 14 deep

315

O

S

Suction/filling line

DIN 228

G1 1/4; 20 deep

6

O

T1

Case drain fluid

DIN 3852

M12 x 1.5; 12 deep

6

X

T2

Case drain fluid

DIN 3852

M12 x 1.5; 12 deep

6

X

U

Bearing flushing

DIN 3852

M12 x 1.5; 12 deep

6

X O O

U1, U2

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

U3, U4

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

Center bore according to DIN 332 (thread according to DIN 13) Observe the general instructions on page 16 for the maximum tightening torques. 3) Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings. 4) The spot face can be deeper than specified in the appropriate standard. 5) The minimum case pressure must be equal to or greater than the barrier fluid pressure. In addition, the barrier fluid pressure must be equal to or greater than the external pressure on the outer shaft seal ring. O = Must be connected (plugged on delivery) X = Plugged (in normal operation) 1)

2)


8/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

Dimensions size 12

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Closed design Direction of rotation clockwise and counter-clockwise identical dimensions

210 171 145 125

45°

45°

851)

49

T2

74

69

163

B

A

B

100

U2 5.5

57

T1

49

U

U3

53

U1

U4

5.51)

14

16

39

12. 5°

ø79.8 38.5 38.5

ø80-0.074

51

51 M8

80

ø100

ø100

U3

A

B

0.61) 66

66

1) Center of gravity


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

Dimensions size 12

9/16

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Drive shaft P3

Parallel keyed shaft to DIN 6885, A6x6x25.5

6

ø28

M6 x 11) 2)

ø20 +0.015 - 0.002

22.5

16

30

Ports Designation Port for

Standard4)

Size2)

A

Service line

DIN 3852

M22 x 1.5; 14 deep

B

Service line

DIN 3852

M22 x 1.5; 14 deep

T1

Case drain fluid

DIN 3852

T2

Case drain fluid

U U1, U2 U3, U4

State

M12 x 1.5; 12 deep

Maximum pressure [bar]3) Clockwise: 30 Counter315 clockwise: Clockwise: 315 Counter30 clockwise: 6

DIN 3852

M12 x 1.5; 12 deep

6

X6)

Bearing flushing

DIN 3852

M12 x 1.5; 12 deep

6

X

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

O

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

O

O

O

O6)

Center bore according to DIN 332 (thread according to DIN 13) Observe the general instructions on page 16 for the maximum tightening torques. 3) Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings. 4) The spot face can be deeper than specified in the appropriate standard. 5) The minimum case pressure must be equal to or greater than the barrier fluid pressure. In addition, the barrier fluid pressure must be equal to or greater than the external pressure on the outer shaft seal ring. 6) Depending on installation position, T1 or T2 must be connected (see also page 15) O = Must be connected (plugged on delivery) X = Plugged (in normal operation) 1)

2)


10/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

Dimensions size 28

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Open design Direction of rotation clockwise

239 199 173 163 94.61) 61

U

T1

U4

U3

163

U1

54

61

70

S

A

111

60 70

65

5.51) 23

12.5

48

A

T2

M10

100

ø100 Direction of rotation counter-clockwise ø100

Direction of rotation clockwise ø100

U3

U3

View Z 163

S

23

ø99.8

ø100-0.087

48

8

U2

75

14

°

42

45°

45°

S

A

A

S

Z

0.71)

0.71) 82.5

82.5

82.5

82.5

1) Center of gravity


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

Dimensions size 28

11/16

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Drive shaft

19 6

ø35

M8 x 1.25 1) 2)

Parallel keyed shaft to DIN 6885, AS8x7x40

ø25 +0.015 -0.002

28

P5

44.5

Ports Designation Port for

Standard4)

Size2)

Maximum pressure [bar]3)

State

A

Service line

DIN 3852

M27 x 2; 16 deep

315

O

S

Suction/filling line

DIN 228

G1 1/2; 20 deep

6

O

T1

Case drain fluid

DIN 3852

M18 x 1.5; 12 deep

6

X

T2

Case drain fluid

DIN 3852

M18 x 1.5; 12 deep

6

X

U

Bearing flushing

DIN 3852

M16 x 1.5; 12 deep

6

X O O

U1, U2

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

U3, U4

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

Center bore according to DIN 332 (thread according to DIN 13) Observe the general instructions on page 16 for the maximum tightening torques. 3) Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings. 4) The spot face can be deeper than specified in the appropriate standard. 5) The minimum case pressure must be equal to or greater than the barrier fluid pressure. In addition, the barrier fluid pressure must be equal to or greater than the external pressure on the outer shaft seal ring. O = Must be connected (plugged on delivery) X = Plugged (in normal operation) 1)

2)


12/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

Dimensions size 28

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Closed design Direction of rotation clockwise and counter-clockwise identical dimensions

239 199 173 163 94.61)

U4

U3

163

T1

8 54

61

T2

70

60 70

65

5.51) 23

12.5

48 ø99.8

ø100-0.087

48

U2

A

B

111

U

°

U1

14

75

42

45°

45°

61

B M10 ø125

100

ø100

U3

B

A

0.71) 82.5

82.5

1) Center of gravity


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

Dimensions size 28

13/16

Before finalizing your design, request a binding installation drawing. Dimensions in mm.

Drive shaft

19 6

ø35

M8 x 1.25 1) 2)

Parallel keyed shaft to DIN 6885, AS8x7x40

ø25 +0.015 -0.002

28

P5

44.5

Ports Designation Port for

Standard4)

Size2)

A

Service line

DIN 3852

M27 x 2; 16 deep

B

Service line

DIN 3852

M27 x 2; 16 deep

T1

Case drain fluid

DIN 3852

T2

Case drain fluid

U U1, U2 U3, U4

State

M18 x 1.5; 12 deep

Maximum pressure [bar]3) Clockwise: 30 Counter315 clockwise: Clockwise: 315 Counter30 clockwise: 6

DIN 3852

M18 x 1.5; 12 deep

6

X6)

Bearing flushing

DIN 3852

M16 x 1.5; 12 deep

6

X

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

O

Barrier fluid

DIN 3852

M10 x 1; 8 deep

35)

O

O

O

O6)

Center bore according to DIN 332 (thread according to DIN 13) Observe the general instructions on page 16 for the maximum tightening torques. 3) Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings. 4) The spot face can be deeper than specified in the appropriate standard. 5) The minimum case pressure must be equal to or greater than the barrier fluid pressure. In addition, the barrier fluid pressure must be equal to or greater than the external pressure on the outer shaft seal ring. 6) Depending on installation position, T1 or T2 must be connected (see also page 15) O = Must be connected (plugged on delivery) X = Plugged (in normal operation) 1)

2)


14/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

High-pressure relief valve, direct operated Example: Direction of rotation, clockwise View Y

Connection diagram for high-pressure relief valve

E

F

B

A

G

Y

T3

C D

NG

A2)

B2)

C

D

E

F

G

H

12

32

32

89

112

93.5

42

131

28

40

40

108

132.5

128

56

143

1) 2)

H

25

Service line port A, B1) M22 x 1.5

Return port T31) M18 x 1.5

26

M27 x 2

M22 x 1.5

DIN 3852, observe the general instructions on page 16 for the maximum tightening torques. Fixing thread according to DIN 13; observe the general instructions on page 16 for the maximum tightening torques.

Setting range______________________________100 to 315 bar Standard setting ________________________________ 250 bar If not specified when ordering, the valves are set to 250 bar.


RE 94010/10.10 | A7VK Series 10

Bosch Rexroth AG

15/16

Installation instructions General

Installation position

During commissioning and operation, the axial piston unit must be filled with hydraulic fluid and air bled. The barrier liquid chambers must be filled with suitable barrier liquid. This is also to be observed following relatively long standstill as the axial piston unit may empty via the hydraulic lines.

Additional installation positions are available upon request.

1 Open design

Closed design The case drain fluid in the case interior must be directed to the reservoir via the highest reservoir port (T1, T2).

U1

T1

U4 U3

.5째

12

Open design The case interior is internally connected to the suction chamber. A case drain line between the case and reservoir is not required. To achieve favorable noise values, decouple all connecting lines using elastic elements.

U

U2

T2 S

2 Closed design

In all operating conditions, the suction and case drain lines must flow into the reservoir below the minimum fluid level. Note For monitoring the shaft seal rings for zero leakage, we recommend connecting a barrier fluid monitor at ports U1 to U4.

U

U1

T1

U4 U3

.5째

12

U2

B

T2

B

Service line port

S

Suction/filling port

T1/T2

Filling/air bleeding case drain port

U1 - U4 Barrier fluid port U

Bearing flushing

Installation position

Air bleed

Filling

1 (open design)

T1

S

2 (closed design)

T1

T1


16/16

Bosch Rexroth AG

A7VK Series 10 | RE 94010/10.10

General instructions –– The pump A7VK is designed for pumping polyurethane components in open and closed design. –– Project planning, installation and commissioning of the axial piston unit requires the involvement of qualified personnel. –– Before using the axial piston unit, please read the corresponding instruction manual completely and thoroughly. If necessary, these can be requested from Rexroth. –– During and shortly after operation, there is a risk of burns on the axial piston unit and pressure relief valve on the service line port. Take appropriate safety measures (e.g. by wearing protective clothing). –– Service line ports -- The ports and fixing threads are designed for the specified maximum pressure. The machine or system manufacturer must ensure that the connecting elements and lines correspond to the specified operating conditions (pressure, flow, hydraulic fluid, temperature) with the necessary safety factors. -- The service line ports and function ports are only designed to accommodate hydraulic lines. –– The data and notes contained herein must be adhered to. –– The product is not approved as a component for the safety concept of a general machine according to DIN EN ISO 13849. –– The following tightening torques apply: -- Fittings: Observe the manufacturer’s instruction regarding the tightening torques of the used fittings. -- Fixing screws: For fixing screws according to DIN 13/ ISO 68, we recommend checking the tightening torque individually according to VDI 2230. -- Threaded hole of the axial piston unit: The maximum permissible tightening torques MG max are maximum values of the threaded holes and must not be exceeded. For values, see the following table. -- Locking screws: For the metal locking screws supplied with the axial piston unit, the required tightening torques of the locking screws MV apply. For values, see the following table.

Standard

Threaded size

Maximum permissible tightening torque of the threaded holes MG max

DIN 3852

M10 x 1

30 Nm

Ports

DIN 228

Required tightening torque of the locking screws MV

WAF hexagon socket of the locking screws

12 Nm

5 mm

M12 x 1.5

50 Nm

25 Nm

6 mm

M16 x 1.5

100 Nm

50 Nm

8 mm

M18 x 1.5

140 Nm

60 Nm

8 mm

M22 x 1.5

210 Nm

80 Nm

10 mm

M27 x 2

330 Nm

135 Nm

12 mm

G1 1/4

720 Nm

G1 1/2

960 Nm

Bosch Rexroth AG Hydraulics Axial Piston Units Glockeraustrasse 2 89275 Elchingen, Germany Phone +49 (0) 73 08 82-0 Fax +49 (0) 73 08 72 74 info.brm-ak@boschrexroth.de www.boschrexroth.com/axial-piston-pumps

© This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging. Subject to change.


Specifications Rexroth Axial Variable Piston Pump A7VK