Control Presion A10Vso Rexroth

A10V(S)O Pressure/Flow control DFR(1) Ports
Pressure port B Case drain port L Pressure control DR Standard setting: A10VODFR/31: 280 bar A10VODFR/52: 250 bar Flow control FR (∆p = 10 - 22 bar) Standard setting: ∆p = 14 bar X - Pilot pressure port Suction port S

(viewed A10VO, BR 31, clockwise)
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A10V(S)O Pressure/Flow control DFR(1) Circuit diagram
Adjustableorifice, (6) res. Mobile valve block (not included in supply)

9 3 2 7
FR

X - port Flow control (Standard: ∆p = 14 bar); Spring force (5)

4

1
DR

Decompression orifice Pressure spring Damping orifice

Control piston (8)
(Circuit diagram viewed for A10VO, series 31)
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Bias piston and spring

A10V(S)O Pressure/Flow control DFR(1) Circuit diagram
Adjustableorifice, res. Mobile valve block (not included in supply) FR X - port Flow control (Standard: ∆p = 14 bar); Decompression orifice Pressure port Damping orifice

DR

Control piston
(Circuit diagram viewed for A10VO, series 31) Counter balance piston and mechanical spring
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A10V(S)O Pressure/Flow control DFR(1) Function and circuit diagram
Orifice res. Mobile valveblock LS - pilot pressure

X
FR

DR

DR - axis FR - axis
X

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A10V(S)O Pressure/Flow control DFR(1) ∆p - control characteristic f (x) = (px, Vg)
High pressure: p HD Simulated load pressure: p X

220 210 200 190 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 25 50 75 100 Fördermenge in

∆p = 15 bar

A10 VO 74 DFR(1)

Mode ofexperimental procedure:
n = 1500 rpm ∆p = 15 bar Stand by = 20 bar

pHD
X DFR1

px

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A10V(S)O Pressure/Flow control DFR(1) Decompression orifice and damping orifice
DFR with decompression orifice:
(DFR: Standard: ∅ 0,35 mm) (DFR1: closed, without drilling)
X

FR

FR - axis

DR

DR - axis

Damping orifice DR - FR
(Standard: ∅ 0,6 mm, Slit in longitudinaldirection: orifice opened Slit in cross direction : orifice closed, SO 74)
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A10V(S)O Pressure/Flow control DFR(1) Damping orifice
Damping orifice DR - FR
(Standard: ∅ 0,6 mm, Slit in longitudinal direction: orifice opened Slit in cross direction
p [bar] 250

: orifice closed, (SO 74)
250,0

pressure increase of the valve (pHD = 200 bar)

closed open

200200,0

150

150,0

100

100,0

50

50,0

0 0,000

0,050

0,100

0,150

0,200

0,250

0,300

0,350

0,400

0,450

0,0 0,500 x [m m ] adjusting path of the piston

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A10V(S)O Pressure/Flow control DFR(1) Measurement of high pressure

Attention: The mini - measurement connection have to be shortened according to the original lenght of theplug (reach of a screw 7 mm).

Measurement high pressure: At this particular spot, the existing plugs (M8 x 1) can be replaced by mini measurement connections
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A10V(S)O Pressure/Flow control DFR(1) Adjustment for pressure- res. flow control
Adjustment of pressure control Adjustment of flow control: „Stand - by“ pressure measurement or Differential pressuremeasurement with swivel angle !

Valve axis: Pressure control
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Valve axis: Flow control

A10V(S)O Pressure/Flow control DFR(1) Adjustment of pressure control DR
Procedure: ⇒ FR - flow control blocked ! ⇒ High pressure line closed ! ⇒ Adjusting of DR pressure control with setting value ! Measuring - point 1: High pressure (measurable at plug of DR valve axis) Adjustment DR: each rotation app. 50 bar !
FR

X

DR

- 50 bar + 50 bar

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A10V(S)O Pressure/Flow control DFR(1) Adjustment of flow control FR
1. „Stand by“ pressure measurement: Procedure: ⇒ X - port unloaded to tank ! ⇒ close high pressure port ! Standard adjustment FR ∆p = 14 bar (When port X is unloaded to tank, a zero stroke pressure of p = 16 ± 1 bar „stand by“...