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
Date Changed Rev
October 2017 add notes for PVST fittings 0402
Jun 2017 Technical data (table) corrected 0401
August 2014 HPCO diagram corrected CC
May 2014 Converted to Danfoss layout – DITA CMS CB
January 2010 Drawings change page 4, 13 CA
September 2009 First edition AA
2 | © Danfoss | October 2017 520L0721 | BC00000109en-US0402
Technical Information
PVBZ, Basic Module - PVP with Integrated HPCO
Contents
Introduction
PVBZ...................................................................................................................................................................................................... 4
PVP with integrated HPCO............................................................................................................................................................4
Function
Sectional view....................................................................................................................................................................................5
PVBZ function.................................................................................................................................................................................... 5
Technical data
PVBZ technical data.........................................................................................................................................................................7
PVP pump side module with T0
PVP, pump side modules with T0 code numbers.................................................................................................................8
PVBZ basic module with T0
PVBZ basic modules with T0 code numbers........................................................................................................................10
PVB basic module with T0
PVB basic modules with T0 code numbers...........................................................................................................................12
Standard spools for PVBZ
End Plate PVST................................................................................................................................................................................ 13
Standard FC-spools for PVBZ (Electrical and Mechanical Actuation)..........................................................................13
Standard Float Spools for PVBZ (Electrical Actuation)......................................................................................................13
PVEH-F electrical actuation........................................................................................................................................................ 13
Hydraulic diagram
PVG 32 with basic modules PVBZ, including integrated pilot operated check valves......................................... 14
PVG 32 with integrated HPCO (High Pressure Carry Over).............................................................................................14
Actuation, PVEH-F
PVBZ Dimensions
Specification sheet examples
PVG 32 Specification Example for Valve Group with PVBZ.............................................................................................17
PVG 32 Specification Example for Valve Group with HPCO........................................................................................... 18
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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
•
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LS
13
P
T
A
B
B A
B A
V310138.A
21
3
4+5
6
12
7
11
8
M
A
9
10
15
14
16
B
18
19
17
PVP
PVBZ
PVBZ
PVBZ
20
Technical Information
PVBZ, Basic Module - PVP with Integrated HPCO
Function
Sectional view
PVBZ function
Legend:
1. Pressure relief valve
2. Pressure reduction valve for pilot oil supply
3. Pressure gauge connection
4. Plug, open centre
5. Orifice, closed centre
6. Pressure adjustment spool
7. Plug, closed centre
8. LS connection
9. T0 connection
10. Plug to be removed for internal T0
11. LS signal
12. Pilot valve for POC
13. Shuttle valve
14. Pilot operated check valve, POC
15. Main spool
16. Compensator
17. Shuttle pin
18. Max. oil adjustment screws for ports A and B
19. Pilot supply for PVE
20. Separate tank line, (T0)
(157B: 5130, 5131, 5330 and 5331 only)
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
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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.
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