Danfoss PVBZ User guide
Technical Information
PVBZ, Basic Module
PVP with Integrated HPCO
powersolutions.danfoss.com
Technical Information
PVBZ, Basic Module - PVP with Integrated HPCO
Revision history |
Table of revisions |
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Changed |
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October 2017 |
add notes for PVST fittings |
0402 |
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Jun 2017 |
Technical data (table) corrected |
0401 |
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August 2014 |
HPCO diagram corrected |
CC |
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May 2014 |
Converted to Danfoss layout – DITA CMS |
CB |
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January 2010 |
Drawings change page 4, 13 |
CA |
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September 2009 |
First edition |
AA |
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2 | © Danfoss | October 2017 |
520L0721 | BC00000109en-US0402 |
Technical Information |
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PVBZ, Basic Module - PVP with Integrated HPCO |
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Contents |
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Introduction |
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PVBZ...................................................................................................................................................................................................... |
4 |
PVP with integrated HPCO............................................................................................................................................................ |
4 |
Function |
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Sectional view.................................................................................................................................................................................... |
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PVBZ function.................................................................................................................................................................................... |
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Technical data |
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PVBZ technical data......................................................................................................................................................................... |
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PVP pump side module with T0 |
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PVP, pump side modules with T0 code numbers................................................................................................................. |
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PVBZ basic module with T0 |
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PVBZ basic modules with T0 code numbers........................................................................................................................ |
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PVB basic module with T0 |
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PVB basic modules with T0 code numbers........................................................................................................................... |
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Standard spools for PVBZ |
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End Plate PVST................................................................................................................................................................................ |
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Standard FC-spools for PVBZ (Electrical and Mechanical Actuation).......................................................................... |
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Standard Float Spools for PVBZ (Electrical Actuation)...................................................................................................... |
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PVEH-F electrical actuation........................................................................................................................................................ |
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Hydraulic diagram |
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PVG 32 with basic modules PVBZ, including integrated pilot operated check valves......................................... |
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PVG 32 with integrated HPCO (High Pressure Carry Over)............................................................................................. |
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Actuation, PVEH-F |
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PVBZ Dimensions |
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Specification sheet examples |
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PVG 32 Specification Example for Valve Group with PVBZ............................................................................................. |
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PVG 32 Specification Example for Valve Group with HPCO........................................................................................... |
18 |
© Danfoss | October 2017 |
520L0721 | BC00000109en-US0402 | 3 |
Technical Information
PVBZ, Basic Module - PVP with Integrated HPCO
Introduction
PVBZ
With the introduction of basic module PVBZ, Danfoss can now supply basic modules with integrated pilot operated check valves.
The PVBZ load compensated module is developed for applications, where integrated pilot operated check valves in the work ports are required to limit the work port leakage down to a minimum (below 1 cm3 [0.06 in3] per minute).
The new PVBZ basic module can only be mixed with basic modules PVB and PVP pumpside modules mentioned in this Tech Note and offers the following features:
•Integrated pilot operated check valves for low internal leakage
•Integrated thermal relief valve
•Standard 4/3 spools
•4/4 float spools
•Interchangeable spools
PVP with integrated HPCO
Together with the introduction of PVBZ (and PVB with separate tank line T0). Danfoss can now also supply PVG 32 valves with integrated HPCO functionality (High Pressure Carry Over).
The HPCO function will guide the pump flow not used in the PVG 32 valve group via the HPCO port to for example a directional valve. The PVP pump side module with integrated HPCO function can only be mixed with PVB, PVBZ and PVST.
Features:
•HPCO functionality
•Prioritized flow for PVG 32
•Reduced plumbing
4 | © Danfoss | October 2017 |
520L0721 | BC00000109en-US0402 |
Technical Information
PVBZ, Basic Module - PVP with Integrated HPCO
Function
Sectional view
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1 |
2 |
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T |
P |
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10 |
3 |
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PVP |
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M |
9 |
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4+5 |
11 |
LS |
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8 |
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7 |
6 |
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12 |
14 |
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B |
A |
PVBZ |
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13 |
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15 |
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16 |
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17 |
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B |
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A |
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PVBZ |
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B
B |
A |
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PVBZ |
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A |
20 |
19 |
18 |
V310138.A
Legend: |
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1. Pressure relief valve |
11. LS signal |
2. Pressure reduction valve for pilot oil supply |
12. Pilot valve for POC |
3. Pressure gauge connection |
13. Shuttle valve |
4. Plug, open centre |
14. Pilot operated check valve, POC |
5. Orifice, closed centre |
15. Main spool |
6. Pressure adjustment spool |
16. Compensator |
7. Plug, closed centre |
17. Shuttle pin |
8. LS connection |
18. Max. oil adjustment screws for ports A and B |
9. T0 connection |
19. Pilot supply for PVE |
10. Plug to be removed for internal T0 |
20. Separate tank line, (T0) |
(157B: 5130, 5131, 5330 and 5331 only) |
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PVBZ function
When main spools (15) are in neutral position, the pilot operated check valves (hereafter POC) are kept closed by a spring plus the work port load, which is directed to the spring side of the POC (14) via a small orifice.
If a main spool is actuated to have flow out of the B port, the meter out flow forces the respective POC valve to open. At the same time, pilot pressure is guided via the main spool to the back side of a small pilot valve (12) on the A port side. This will ensures, that the load pressure behind the POC is released to a
© Danfoss | October 2017 |
520L0721 | BC00000109en-US0402 | 5 |
Technical Information
PVBZ, Basic Module - PVP with Integrated HPCO
Function
separate tank T0 (20) via a seat valve and allow the POC to open and let return flow pass across the main spool back to tank.
For float function, both POC are released to tank at the same time like described above.
In some applications with 3/3 spools and low load pressure (eg. Hitch applications), it is necessary to force open the POC by a pin (17). This pin is actuated by means of pump pressure on the A portside.
PVBZ modules cannot be option mounted (PVM on B - Port side).
The separate tank connection T0 is needed to ensure proper performance of the POC’ s regardless of the pressure in main tank line T. It is therefore nessessary to connect the T0 port (9) in the Inlet PVP directly to the oil reservoir with a separate hose.
Thermal relief valves (157B6261, 157B6262, 157B6266 157B6661, 157B6662 and 157B6666) can be integrated to ensure that unintended high pressure between POC and cylinder/motor is not built up by means of external heat source. The setting of the therminal relief is fixed to 276 bar [4003 psi], max. capacity 1 l/min [0.264 US gal/min].
If tank connection T0 is not used, plug (10) must be removed. Pos 10 is not part of 157B5132, 157B5133, 157B5332 and 157B5333 and therefore T0-port (9) in 157B5132, 157B5133, 157B5332 and 157B5333 must always be connected to tank. PVBZ can only be used in combination with PVB and PVP mentioned in this Tech Note.
When using PVB, PVBZ and PVP (157B5140, 157B5142, 157B5340 and 157B5342 only) with separate tank line T0 it is possible to pressurize the tank port in PVP having HPCO function.
Return flow from A and B ports of PVG 32 must be guided to tank via separate tank port in the end plate PVST* (157B2500 and 157B2520).
*When using a PVST (157B2500 or 157B2520) it is not possible to use the LS A/B fitting in the bottom of the PVG-section next to the PVST.
T0 tank port in PVP 157B5140, 157B5142, 157B5340 and 157B5342 must always be connected to tank, see hydraulic diagram and PVG 32 Specification Example for Valve Group with HPCO on page 18 for according specification.
6 | © Danfoss | October 2017 |
520L0721 | BC00000109en-US0402 |
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