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PVG 128
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Danfoss PVG 128, PVG 256 User guide

Technical Information
PVG 128/256
Proportional Valve Group
www.danfoss.com
Technical Information
PVG 128/256 Technical Information
Revision history Table of revisions
Date Changed Rev
July 2021 Corrected PVB 256 3-way Compensator with LS A/B parts table 0510
March 2021 Corrected PVSI with P and T port dimensions 0509
May 2020 Minor revision - data corrections throughout, updated version number to match online
Changed document number from 'BC00000380' to 'BC220686485279' XX
June 2019 Minor changes throughout document, new images added. 0407
September 2018 Safety topic added. 0406
August 2018 Layout changes, minor edits 0405
June 2018 Table for dimensions page 90 update. 0404
March 2018 Minor edits 0403
January 2018 correction to part number pg 54 0402
October 2017 Updated port names on schematics 0401
July 2017 Updated specs and dimensions 0301
March 2017 Corrected PVAS equation 0203
March 2017 Updated PVAS tables 0202
January 2017 Changed PVEO and PVEH product data 0201
November 2016 First edition 0101
0508
2 | © Danfoss | July 2021 BC220686485279en-000510
Technical Information
PVG 128/256 Technical Information

Contents

General Information
Safety in Systems..............................................................................................................................................................................5
PVG 128/256 Proportional Valve Group...................................................................................................................................7
PVG general description................................................................................................................................................................ 8
Features of the PVG 128/256 valve............................................................................................................................................ 8
PVPV Inlet Modules
Closed Center PPRV for PVE Activation and/or Mechanical........................................................................................... 10
PPRV for PVH/PVHC Activation and/or Mechanical ..........................................................................................................12
PVB 128 Variant Overview
PVB 128 3-way Compensator.................................................................................................................................................... 15
PVB 128 3-way Compensator with LS A/B.............................................................................................................................18
PVB 128 3-way Compensator with LS A/B and PVLP.........................................................................................................22
PVB 256 Variant Overview
PVB 256 3-way Compensator.................................................................................................................................................... 28
PVB 256 3-way Compensator with LS A/B.............................................................................................................................32
PVB 256 3-way Compensator with LSA/B and PVLP..........................................................................................................36
PVB 256 3-way Compensator with LS A/B, PVLP and Turbo...........................................................................................41
PVLP Shock and PVLA Suction Valves
PVLP Overview................................................................................................................................................................................46
PVLP Technical Data......................................................................................................................................................................46
PVBS Main Spool
PVBS Main Spools variant overview........................................................................................................................................49
Flow control spools..................................................................................................................................................................49
PVBS main spools product details........................................................................................................................................... 49
PVS Main spools part numbers................................................................................................................................................. 51
Flow control spools..................................................................................................................................................................52
Flow control spool closed neutral position............................................................................................................... 52
Flow control spool throttled open neutral position...............................................................................................52
Single acting cylinder flow control spool closed neutral position, flow control B port............................ 53
Flow control spool closed neutral position with A-float.......................................................................................54
PVM Manual Activation
PVM Technical Data.......................................................................................................................................................................56
PVH Hydraulic Actuation
PVH Technical Data....................................................................................................................................................................... 58
PVHC Electro-Hydraulic Actuator type
PVHC Technical Data.....................................................................................................................................................................60
PVMD Cover Manual Actuation Only
PVMD Part Numbers..................................................................................................................................................................... 61
PVE Electrical Actuator
PVE Series 7 Electrical Actuator.................................................................................................................................................62
PVE Variant Overview
PVE Variant Overview................................................................................................................................................................... 64
PVEO................................................................................................................................................................................................... 64
PVEO..............................................................................................................................................................................................65
PVEO Schematics and Dimensions............................................................................................................................... 66
PVEO Technical Data..........................................................................................................................................................66
PVEO 128/256 Reaction Times........................................................................................................................................67
PVEO Variants for PVG....................................................................................................................................................... 67
PVEH....................................................................................................................................................................................................68
PVEH Overview..........................................................................................................................................................................68
PVEH Schematics and Dimensions............................................................................................................................... 69
PVEH Technical Data.......................................................................................................................................................... 69
PVEH Reaction Times......................................................................................................................................................... 71
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Danfoss | July 2021 BC220686485279en-000510 | 3
Technical Information
PVG 128/256 Technical Information
Contents
PVEH Hysteresis and Ripple.............................................................................................................................................71
PVEH Variants for PVG....................................................................................................................................................... 72
Connector Overview
Connector Overview.....................................................................................................................................................................73
Fault Monitoring and Reaction
Generic Fault Reaction.................................................................................................................................................................74
PVEH Fault Reaction Overview..................................................................................................................................................75
Functionality Overview
Standard and Fixed US 0-10 Vdc.............................................................................................................................................. 76
PWM Voltage Control..............................................................................................................................................................76
Float A-Port (-FLA)..........................................................................................................................................................................78
PVE Power Save.............................................................................................................................................................................. 78
Special Features
Dedicated Float Pin (UF)..............................................................................................................................................................79
Disable Mode...................................................................................................................................................................................79
Performance Overview
PVG 128/256 Reaction Times.....................................................................................................................................................80
Hysteresis and Ripple................................................................................................................................................................... 81
Oil Consumption............................................................................................................................................................................ 81
PVSI/PVGI End and Interface Plates
PVSI with or without LX-connection.......................................................................................................................................83
PVSI with P and T port connections........................................................................................................................................ 84
PVGI Interface Plate.......................................................................................................................................................................85
PVAS
PVAS for Combo............................................................................................................................................................................. 87
PVAS Part Number Overview.....................................................................................................................................................88
PVG Valve Schematics
Valve Schematics............................................................................................................................................................................90
Dimension Overview
Dimension Overview for PVG 128/256...................................................................................................................................92
Specifications example................................................................................................................................................................ 95
4 | © Danfoss | July 2021 BC220686485279en-000510
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Technical Information
PVG 128/256 Technical Information

General Information

Safety in Systems

All types and brands of control valves, including proportional valves, can fail. Therefore, the necessary protection against the serious consequences of a functional failure should always be built into the system.
General safety considerations
For each application an assessment should be made for the consequences of the system in case of pressure failure and uncontrolled or blocked movements.
Warning
Because the proportional valve is used in many different applications and under different operating conditions, it is the sole responsibility of the manufacturer to ensure that all performance, safety and warning requirements of the application is met in his selection of products and complies with relevant machine specific and generic standards.
Control system example
An example of a control system using an aerial lift is shown below:
Aerial lift
This example breaks down the control system into smaller bits explaining the architecture in depth. Even though many Danfoss components are used in the PVG control system.
The function of the control system is to use the output from the PVE together other external sensors to ensure the PLUS+1 main controllers correct function of the aerial lift.
©
Danfoss | July 2021 BC220686485279en-000510 | 5
W
C
Technical Information
PVG 128/256 Technical Information
General Information
Electrical block diagram
Warning
It is the responsibility of the equipment manufacturer that the control system incorporated in the machine is declared as being in conformity with the relevant machine directives.
Caution
A mix of electrical actuation and hydraulic actuation on the same valve stack is not safe. PVE and PVH are designed for different pilot pressure.
Cost-free repairs, as mentioned in Danfoss General Conditions of Sale, are carried out only at Danfoss or at service shops authorized by Danfoss.
6 | © Danfoss | July 2021 BC220686485279en-000510
PVPV
PVE/PVHC ActuatorsPVB 256
PVM PVBS
PVB 128
PVMD/PVH Covers
PVSI/PVGI
PVAS
P109160
Technical Information
PVG 128/256 Technical Information
General Information

PVG 128/256 Proportional Valve Group

Navigation
PVPV PVB 256 PVB 128 PVBS Main Spool on page 49 PVM PVE Series 7 Electrical Actuator on
PVMD/PVH Covers PVSI/PVGI End and Interface Plates on
page 82
page 62/PVHC
PVAS
©
Danfoss | July 2021 BC220686485279en-000510 | 7
Technical Information
PVG 128/256 Technical Information
General Information

PVG general description

PVG is a hydraulic, load-sensing proportional valve, designed for optimal machine performance and maximum design flexibility.
The PVG valve design is based on a modular concept that enables machine designers to specify a valve solution suitable for multiple market segments across multiple applications.
The load independent proportional control valve and high performance actuator technology combined with a low pressure drop design improves the machine performance and efficiency – increasing productivity and reducing energy consumption.

Features of the PVG 128/256 valve

•
Inlet flow up to 1200 l/min [317 US gal/min]
•
Compact sectional platform solution for easy integration with PVG 16 and PVG 32
•
Load-independent flow control:
Oil flow to an individual function is independent of the load pressure of this function
‒
Oil flow to one function is independent of the load pressure of other functions
‒
•
Reliable regulation characteristics across the entire flow range
•
Load sense relief valves for A and B port enables reduced energy loss at target pressure
•
Optimized for lower pressure drop and higher efficiency
•
Several options for connection threads and flange mount
•
Compact design, easy installation and serviceability
•
Static Load sense system when selecting pump control
•
Internal T0 connection in all PVSI/PVGI
8 | © Danfoss | July 2021 BC220686485279en-000510
59
47.5
285.5
100.5
78.5
68
43.5
180.6
62
PVPV 256
PVPV inlet module dimensions (mm)
Weight 10 kg [22 lbs]
Technical Information
PVG 128/256 Technical Information

PVPV Inlet Modules

The Closed Center PVPV inlet with integrated pilot pressure reduction valve (PPRV) for PVE activation is intended for use with variable displacement pumps in applications where a valve group with electro­hydraulic or hydraulically controlled work sections is desired.
All Variants are prepared for 2xPVLP shock/anti-cavitation valves for pressure peak protection and anti­cavitation prevention.
PVLPs are for pressure peak protection in the system and pump. Optional electrically actuated pilot shut off valve PVPP provides additional functional system safety by
removing pilot oil from the electrical actuation or hydraulic actuation system, disabling main spool actuation.
All variants have internal T0 to tank connection in the PVSI and PVGI end plates.
The PVPV 256 inlet module variants are based on a generic platform with a selection of additional features, enabling you to tailor the PVPV inlet to suit the demands of any hydraulic system.
Variable displacement pump symbol
The generic PVPV 256 inlet module platform includes the following main variants:
Closed Center PVPV with PPRV PVEClosed center inlet module for variable displacement pumps. Closed Center PVPV with PPRV for PVH/PVHC Closed center inlet module for variable displacement pumps.
Optional feature: PVPP Electrical Pilot Shut-Off Valve - Closed center inlet module for variable displacement pumps.
©
Danfoss | July 2021 BC220686485279en-000510 | 9
P Pp
T
T
LS
P
P109162
Technical Information
PVG 128/256 Technical Information
PVPV Inlet Modules

Closed Center PPRV for PVE Activation and/or Mechanical

The PVPV 256 inlet modules, also referred to as pump side modules, act as an interface between the PVG 128/256 proportional valve group and the hydraulic pump and tank reservoir.
Schematic
Technical data
Max. rated pressure P-port continuous 350 bar [5076 psi]
P-port intermittent 400 bar [5800 psi]
T-port static/dynamic 25/40 bar [363/580 psi] Rated Port P (PVPV/PVSI) P-port 600/600 l/min [159/159 US gal/min] Oil temperature Recommended 30 to 60°C [86 to 140°F]
Minimum -30°C [-22°F]
Maximum 90° [194°F] Ambient temperature Recommended -30 to 60°C [-22 to 140°F] Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Minimum 4 mm2/s [39 SUS]
Maximum 460 mm2/s [2128 SUS] Oil contamination
according to ISO 4406
Maximum 23/19/16
Part numbers for Closed Center PVPV with PPRV for PVE
Part number
11173130 PVE
11176703 PVE
11176691 PVE
11176702 PVE
10 | © Danfoss | July 2021 BC220686485279en-000510
PPRV P-port T-port
Metric
Flange
1-1/4”
Thread Ports
G1-1/2" BSP
SAE Flange
1-1/4” UNF
Thread Ports
1-7/8” UNF
Metric Flange 1-1/2”
Thread Ports G1-1/2" BSP
SAE Flange 1-1/2” UNF
Thread Ports 1-7/8” UNF
LS-port Gauge-port
G3/8"BSP G3/8"BSP G1/4"BSP M12
G3/8"BSP G3/8"BSP G1/4"BSP M12
9/16-18 UNF 3/4-16 UNF 7/16-20 UNF M12
9/16-18 UNF 3/4-16 UNF 7/16-20 UNF M12
M-port Gauge-port
T- and Pp Gauge-port
Mounting feet
[psi] [bar]
P
Max
Min
Q
400
300
200
100
0
30
25
20
15
10
5
0
0 1 2 3 4 5
0 0.25 0.5 0.75 1.0 1.25
Q
[l/min]
[US gal/min]
P109211
Technical Information
PVG 128/256 Technical Information
PVPV Inlet Modules
Pilot Pressure Reduction Valve Performance
Accessory module for PVPV 256
Ordering information 12 V 24 V
PVPP Pilot shut off valve 11160318 11160319
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Danfoss | July 2021 BC220686485279en-000510 | 11
P Pp
T
T
LS
P
P109163
Technical Information
PVG 128/256 Technical Information
PVPV Inlet Modules

PPRV for PVH/PVHC Activation and/or Mechanical

The Closed Center PVPV inlet with integrated pilot pressure reduction valve (PPRV) for PVH/PVHC activation is intended for use with variable displacement pumps in applications where a valve group with PVH/PVHC controlled work sections is desired.
All Variants are prepared for 2xPVLP shock/anti-cavitation valves for pressure peak protection and anti­cavitation prevention.
Optional electrically actuated pilot shut off valve PVPP provides additional functional system safety by removing pilot oil from the electrical actuation or hydraulic actuation system, disabling main spool actuation.
Schematic
Technical data
Max. rated pressure P-port continuous 350 bar [5076 psi]
P-port intermittent 400 bar [5800 psi]
T-port static/dynamic 25/40 bar [363/580 psi] Rated Port P (PVPV/PVSI) P-port 600/600 l/min [159/159 US gal/min] Oil temperature Recommended 30 to 60°C [86 to 140°F]
Minimum -30°C [-22°F]
Maximum 90° [194°F] Ambient temperature Recommended -30 to 60°C [-22 to 140°F] Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Minimum 4 mm2/s [39 SUS]
Maximum 460 mm2/s [2128 SUS] Oil contamination
according to ISO 4406
Maximum 23/19/16
Part numbers for Closed Center PVPV with PPRV for PVH/PVHC
Part number
11178095 PVH/PVHC
11178098 PVH/PVHC
11178117 PVH/PVHC
11178119 PVH/PVHC
PPRV P-port T-port
Metric
Flange
1-1/4”
Thread Ports
G1-1/2" BSP
SAE Flange
1-1/4” UNF
Thread Ports
1-7/8” UNF
Metric Flange 1-1/2”
Thread Ports G1-1/2" BSP
SAE Flange 1-1/2” UNF
Thread Ports 1-7/8” UNF
LS-port Gauge-port
G3/8"BSP G3/8"BSP G1/4"BSP M12
G3/8"BSP G3/8"BSP G1/4"BSP M12
9/16-18 UNF 3/4-16 UNF 7/16-20 UNF M12
9/16-18 UNF 3/4-16 UNF 7/16-20 UNF M12
M-port Gauge-port
T- and Pp Gauge-port
Mounting feet
12 | © Danfoss | July 2021 BC220686485279en-000510
1 2 3 4 5
5
0
0
P
Max
Min
Q
Q
[psi] [bar]
400
300
200
100
0
30
25
20
15
10
0 0.25 0.5 0.75 1.0 1.25
[l/min]
[US gal/min]
P109212
Technical Information
PVG 128/256 Technical Information
PVPV Inlet Modules
Pilot Pressure Reduction Valve Performance
Accessory module for PVPV 256
Ordering information 12 V 24 V
PVPP Pilot shut off valve 11160318 11160319
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Danfoss | July 2021 BC220686485279en-000510 | 13
182.2
205
23.5
66
107
178.8
33
PVB 128
PVB 128 basic module dimensions (mm)
Weight 10 kg [22 lbs]
W
Technical Information
PVG 128/256 Technical Information

PVB 128 Variant Overview

The PVG 128 Basic modules (PVB), also referred to as work sections, is the interface between the PVG 128 proportional valve group and the work function such as a cylinder or a motor.
The PVB basic module variants are based on a generic platform with a selection of additional features, enabling you to tailor the PVB to suit the demands of any hydraulic system.
The compensator is a 3-way type which include load drop check valve functionality, compensator function and neutral relief which avoid A and B port pressure build up in neutral.
Symbol - compensated PVB
The generic PVB basic module platform includes the following main variants:
PVB 128 Compensated basic module. Compensated PVB 128 w LSA/B Compensated basic module with LSA/B relief valve for each work port. Compensated PVB 128 with LSA/B and PVLP Compensated basic module with LSA/B relief valve for each
work port and 2xPVLPs for each work port.
Warning
Risk of leak The module will leak if the flange mount screws are not properly secured. Flange mount screws according to ISO 6162-2.
14 | © Danfoss | July 2021 BC220686485279en-000510
A
B
P109173
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview

PVB 128 3-way Compensator

The compensated PVB is intended for controlling a work function where the function behavior in terms of flow and pressures requires independency on the load pressure of other functions used simultaneously.
The compensator is a 3-way type which include load drop check valve functionality, compensator function and neutral relief which avoid A and B port pressure build up in neutral.
Schematic
Technical data
Max. rated pressure A/B port continuous 350 bar [5076 psi]
Max. rated flow Oil temperature Recommended 30 to 60°C [86 to 140°F]
Ambient temperature Recommended -30 to 60°C [-22 to 140°F] Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Oil contamination according to ISO 4406
Max. internal leakage at 100 bar [1450 psi] and 21 mm2/s [102 SUS]
*
Rated flow at 15 bar margin pressure
A/B port intermittent 400 [5800 psi]
*
A/B port 250 l/min [66 US gal/min]
Minimum -30°C [-22°F] Maximum 90° [194°F]
Minimum 4 mm2/s [39 SUS] Maximum 460 mm2/s [2128 SUS] Maximum 23/19/16
A/B→T without shock valve 70 cm3/min [4.27 in3/min] A/B→T with shock valve 80 cm3/min [4.88 in3/min
Part numbers for Compensated PVB 128
Part number A/B-port PVLP/PVLA LS A/B-port
11170522 Metric Flange 3/4” - ­11170528 G 1" BSP - ­11170524 SAE Flange 3/4” UNC - ­11170526 Thread Ports 1 5/16 UNC - -
©
Danfoss | July 2021 BC220686485279en-000510 | 15
AP
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
[mm]
PVM
01234567
[in]
PVM
00.040.080.120.160.200.240.28
PVEH
U
s
U
DC
8
0.31
910
0.350.39
5
10
15
20
25
30
35
40
45
50
55
60
65
A
B
C
D
E
BP
[mm]
PVM
1098765
[in]
PVM
0.390.350.310.280.240.20 U
s
U
DC
0.70.650.60.55
4
0.16
0.5
321
0
0.120.080.04
0.75
A
B
C
D
E
PVEH
PVEH-U
5.0
7.5
PVEH-U
0.450.40.350.3
0.25
0.5
2.5
5.0
[V]
[V]
0
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
5
10
15
20
25
30
35
40
45
50
55
60
65
250225200175150125
100
755025
0
Q
350
325300275
P
P
25002000150010005000 35003000 4000 50004500
[b ar]
[p si]
P109213
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
Oil flow as function of spool travel
Load Independent Oil Flow, Pressure Compensated
16 | © Danfoss | July 2021 BC220686485279en-000510
25 50 75 100 125 150 175 200 225 250 275 300
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
25
20
15
10
5
0
250
200
150
100
50
0
350
300
0
0
Port P to Port A/B at full spool stroke
E = Spool 240 l/min
P
Q
Q
[psi] [bar]
[l/min]
[US gal/min]
P109240
5
0
0
P
Port A/B to Tank at full spool stroke
Q
Q
[psi] [bar]
350
300
200
150
100
50
250
0 25 50 75 100 125 150 175 200 225 250 275 300
25
20
15
10
0 5 10 15 20 25 30 35 404550
55 60
65 70 75 80
E = Spool 240 l/min
[l/min]
[US gal/min]
P109241
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
PVB 128 Upstream Performance
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Danfoss | July 2021 BC220686485279en-000510 | 17
PVB 128 Downstream Performance
A
B
LS/B
LS/A
P109186
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview

PVB 128 3-way Compensator with LS A/B

The compensated PVB is intended for controlling a work function where the function behavior in terms of flow and pressures requires independency on the load pressure of other functions used simultaneously.
The integrated LSA/B relief valves are used to limit the maximum work port pressure on the A and B-ports individually.
The compensator is a 3-way type which include load drop check valve functionality, compensator function and neutral relief which avoid A and B port pressure build up in neutral.
Schematic
Technical data
Max. rated pressure A/B port continuous 350 bar [5076 psi]
A/B port intermittent 400 [5800 psi] Max. rated flow Oil temperature Recommended 30 to 60°C [86 to 140°F]
Ambient temperature Recommended -30 to 60°C [-22 to 140°F] Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Oil contamination according to ISO 4406
Max. internal leakage at 100 bar [1450 psi] and 21 mm2/s [102 SUS]
*
Rated flow at 15 bar margin pressure
*
A/B port 250 l/min [66 US gal/min]
Minimum -30°C [-22°F]
Maximum 90° [194°F]
Minimum 4 mm2/s [39 SUS]
Maximum 460 mm2/s [2128 SUS]
Maximum 23/19/16
A/B→T without shock valve 70 cm3/min [4.27 in3/min]
A/B→T with shock valve 80 cm3/min [4.88 in3/min
Part numbers for Compensated PVB with LS A/B
Part number A/B-port PVLP/PVLA LS A/B-port
11176915 Metric Flange 3/4” - G1/4"BSP 11176918 G 1" BSP - G1/4"BSP 11176916 SAE Flange 3/4” UNC - 7/16-20 UNC 11176917 Thread Ports 1 5/16 UNC - 7/16-20 UNC
18 | © Danfoss | July 2021 BC220686485279en-000510
AP
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
[mm]
PVM
01234567
[in]
PVM
00.040.080.120.160.200.240.28
PVEH
U
s
U
DC
8
0.31
910
0.350.39
5
10
15
20
25
30
35
40
45
50
55
60
65
A
B
C
D
E
BP
[mm]
PVM
1098765
[in]
PVM
0.390.350.310.280.240.20 U
s
U
DC
0.70.650.60.55
4
0.16
0.5
321
0
0.120.080.04
0.75
A
B
C
D
E
PVEH
PVEH-U
5.0
7.5
PVEH-U
0.450.40.350.3
0.25
0.5
2.5
5.0
[V]
[V]
0
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
5
10
15
20
25
30
35
40
45
50
55
60
65
250225200175150125
100
755025
0
Q
350
325300275
P
P
25002000150010005000 35003000 4000 50004500
[b ar]
[p si]
P109213
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
Oil flow as function of spool travel
Load Independent Oil Flow, Pressure Compensated
©
Danfoss | July 2021 BC220686485279en-000510 | 19
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
5
10
15
20
25
30
35
40
45
50
55
60
65
250225200175150125
100
755025
0
Q
350
325300275
P
P
25002000150010005000 35003000 4000 50004500
0
[bar]
[psi]
P109215
25 50 75 100 125 150 175 200 225 250 275 300
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
25
20
15
10
5
0
250
200
150
100
50
0
350
300
0
0
Port P to Port A/B at full spool stroke
E = Spool 240 l/min
P
Q
Q
[psi] [bar]
[l/min]
[US gal/min]
P109240
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
LS A/B Pressure Relief Valve
PVB 128 Upstream Performance
20 | © Danfoss | July 2021 BC220686485279en-000510
5
0
0
P
Port A/B to Tank at full spool stroke
Q
Q
[psi] [bar]
350
300
200
150
100
50
250
0 25 50 75 100 125 150 175 200 225 250 275 300
25
20
15
10
0 5 10 15 20 25 30 35 404550
55 60
65 70 75 80
E = Spool 240 l/min
[l/min]
[US gal/min]
P109241
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
PVB 128 Downstream Performance
©
Danfoss | July 2021 BC220686485279en-000510 | 21
LS/B
LS/A
B
A
P109172
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview

PVB 128 3-way Compensator with LS A/B and PVLP

The compensated PVB is intended for controlling a work function where the function behavior in terms of flow and pressures requires independency on the load pressure of other functions used simultaneously.
The integrated LS A/B relief valves are used to limit the maximum work port pressure on the A and B­ports individually.
Featuring 2xPVLP shock/anti-cavitation valves on each work port for pressure peak protection and anti­cavitation prevention
The compensator is a 3-way type which include load drop check valve functionality, compensator function and neutral relief which avoid A and B port pressure build up in neutral.
Schematic
Technical data
Max. rated pressure A/B port continuous 350 bar [5076 psi]
A/B port intermittent 400 [5800 psi] Max. rated flow Oil temperature Recommended 30 to 60°C [86 to 140°F]
Ambient temperature Recommended -30 to 60°C [-22 to 140°F] Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Oil contamination according to ISO 4406
Max. internal leakage at 100 bar [1450 psi] and 21 mm2/s [102 SUS]
*
Rated flow at 15 bar margin pressure
*
A/B port 250 l/min [66 US gal/min]
Minimum -30°C [-22°F]
Maximum 90° [194°F]
Minimum 4 mm2/s [39 SUS]
Maximum 460 mm2/s [2128 SUS]
Maximum 23/19/16
A/B→T without shock valve 70 cm3/min [4.27 in3/min]
A/B→T with shock valve 80 cm3/min [4.88 in3/min
Part numbers for Compensated PVB 128 with LSA/B and PVLP
Part number A/B-port PVLP/PVLA LS A/B-port
11165621 Metric Flange 3/4” 2 PVLP/PVLA G1/4"BSP 11170527 G 1" BSP 2 PVLP/PVLA G1/4"BSP 11170523 SAE Flange 3/4” UNC 2 PVLP/PVLA 7/16-20 UNC 11170525 Thread Ports 1 5/16 UNC 2 PVLP/PVLA 7/16-20 UNC
22 | © Danfoss | July 2021 BC220686485279en-000510
AP
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
[mm]
PVM
01234567
[in]
PVM
00.040.080.120.160.200.240.28
PVEH
U
s
U
DC
8
0.31
910
0.350.39
5
10
15
20
25
30
35
40
45
50
55
60
65
A
B
C
D
E
BP
[mm]
PVM
1098765
[in]
PVM
0.390.350.310.280.240.20 U
s
U
DC
0.70.650.60.55
4
0.16
0.5
321
0
0.120.080.04
0.75
A
B
C
D
E
PVEH
PVEH-U
5.0
7.5
PVEH-U
0.450.40.350.3
0.25
0.5
2.5
5.0
[V]
[V]
0
25 50 75 100 125 150 175 200 225 250
[l/min]
[USgal/min]
5 10 15 20 25 30 35 40 45 50 55 60 65
250
225
200
175
150
125
100
75
50
25
0
Q
350
325
300
275
PP
2500
2000
1500
1000
500
0
3500
3000
4000
5000
4500
0
[psi] [bar]
0
Q
P109216
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
Oil flow as function of spool travel
©
Danfoss | July 2021 BC220686485279en-000510 | 23
2xPVLP Shock Valve
25 50 75 100 125 150 175 200 225 250 275 300 325
[l/min]
[US gal/min]
350 375 400
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100105
50
45
40
35
30
25
20
15
10
5
0
425 450 475 500
110115120 125130
Q
70
65
60
55
PP
500
400
300
200
100
0
700
600
800
1000
900
0
[ps i] [ bar ]
0
Q
Po rt A /B
P109217
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
5
10
15
20
25
30
35
40
45
50
55
60
65
250225200175150125
100
755025
0
Q
350
325300275
P
P
25002000150010005000 35003000 4000 50004500
[b ar]
[p si]
P109213
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
2xPVLA Suction Valve
Load Independent Oil Flow, Pressure Compensated
24 | © Danfoss | July 2021 BC220686485279en-000510
25
50
75
100
125
150
175
200
225
250
[l/min] [US gal/min]
5
10
15
20
25
30
35
40
45
50
55
60
65
250225200175150125
100
755025
0
Q
350
325300275
P
P
25002000150010005000 35003000 4000 50004500
0
[bar]
[psi]
P109215
25 50 75 100 125 150 175 200 225 250 275 300
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
25
20
15
10
5
0
250
200
150
100
50
0
350
300
0
0
Port P to Port A/B at full spool stroke
E = Spool 240 l/min
P
Q
Q
[psi] [bar]
[l/min]
[US gal/min]
P109240
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
LS A/B Pressure Relief Valve
PVB 128 Upstream Performance
©
Danfoss | July 2021 BC220686485279en-000510 | 25
5
0
0
P
Port A/B to Tank at full spool stroke
Q
Q
[psi] [bar]
350
300
200
150
100
50
250
0 25 50 75 100 125 150 175 200 225 250 275 300
25
20
15
10
0 5 10 15 20 25 30 35 404550
55 60
65 70 75 80
E = Spool 240 l/min
[l/min]
[US gal/min]
P109241
Technical Information
PVG 128/256 Technical Information
PVB 128 Variant Overview
PVB 128 Downstream Performance
26 | © Danfoss | July 2021 BC220686485279en-000510
182.2
205
23.5
86
107
178.5
43
PVB 256
PVB 256 basic module dimensions (mm)
Weight 16 kg [35.3 lbs]
Technical Information
PVG 128/256 Technical Information

PVB 256 Variant Overview

The PVG 256 Basic modules (PVB), also referred to as work sections, is the interface between the PVG 256 proportional valve group and the work function such as a cylinder or a motor.
The PVB basic module variants are based on a generic platform with a selection of additional features, enabling you to tailor the PVB to suit the demands of any hydraulic system.
The compensator is a 3-way type which includes load drop check valve functionality, compensator function and neutral relief which avoid A and B port pressure build up.
The generic PVB basic module platform includes the following main variants.
Compensated PVB 256 Compensated basic module. Compensated PVB 256 with LS A/B Compensated basic module with LSA/B relief valve for each work port. Compensated PVB 256 with LS A/B and PVLP Compensated basic module with LSA/B relief valve for each
work port and 3xPVLPs for each work port.
Compensated PVB 256 with Turbo compensator feature Compensated basic module with LS A/B relief valve
for each work port and 3xPVLPs for each work port.
©
Danfoss | July 2021 BC220686485279en-000510 | 27
A
B
P109168
Technical Information
PVG 128/256 Technical Information
PVB 256 Variant Overview

PVB 256 3-way Compensator

The compensated PVB is intended for controlling a work function where the function behavior in terms of flow and pressures requires independency on the load pressure of other functions used simultaneously.
The integrated LS A/B relief valves are used to limit the maximum work port pressure on the A and B­ports individually.
The compensator is a 3-way type which include load drop check valve functionality, compensator function and neutral relief which avoid A and B port pressure build up in neutral.
Schematic
Technical data
Max. rated pressure A/B port continuous 350 bar [5076 psi]
A/B port intermittent 400 bar [5800 psi] Max. rated flow A/B port 450 l/min [119 US gal/min] Oil temperature Recommended 30 to 60°C [86 to 140°F]
Minimum -30°C [-22°F]
Maximum 90° [194°F] Ambient temperature Recommended -30 to 60°C [-22 to 140°F] Oil viscosity Operating range 12 to 75 mm2/s [65 to 347 SUS]
Minimum 4 mm2/s [39 SUS]
Maximum 460 mm2/s [2128 SUS] Oil contamination
according to ISO 4406 Max. internal leakage at 100
bar [1450 psi] and 21 mm2/s [102 SUS]
Maximum 23/19/16
A/B→T without shock valve 70 cm3/min [4.27 in3/min]
A/B→T with shock valve 85 cm3/min [5.19 in3/min]
Part numbers for Compensated PVB 256
Part number A/B port PVLP/PVLA LS A/B port
11169244 Metric Flange 1” - ­11169252 G1 BSP - ­11169248 SAE Flange 1” UNC - ­11177020 Thread Ports 1-5/16-12 UNC - -
28 | © Danfoss | July 2021 BC220686485279en-000510
A
P
25
50
75
100
125
150
175
200
225
250
275
300
325
[l/min] [US gal/min]
[mm]
PVM
01234567
[in]
PVM
0
0.04
0.080.120.160 .20
0.24
0.28
PVEH
U
s
U
DC
0.50.45
0.40.350.3
8
0.31
0.25
9
10
350
375
400
0.35
0.39
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
105
BP
[mm]
PVM
1098765
[in]
PVM
0.390.350.310. 280.240.20
PVEH
U
s
U
DC
0.70.650.60.55
4
0.16
0.5
3210
0.120.080.040
0.75
PVEH-U
5.0
2.5
PVEH-U
5.0
7.5
[V]
[V]
A
B
C
D
E
F
G
A
B
C
D
E
F
G
Technical Information
PVG 128/256 Technical Information
PVB 256 Variant Overview
Oil Flow as Function of Spool Travel
©
Danfoss | July 2021 BC220686485279en-000510 | 29
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