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The main spools (PVBS) determine the flow out of the work section or the pressure build up, and are
based on a generic platform with a wide selection of additional features, enabling you to tailor the PVBS
to suit the demands of any hydraulic system and any function.
The PVBS main spool can be activated in three different ways:
•
Mechanically by a PVM lever
•
Electrically by a PVE/PVHC actuator
•
Hydraulically by a PVH actuator
PVBS main spool
PVBS main spool dimensions
159 [6.26 ]
110 [4.33]
21.5
[0.85]
Weight: 0.25 kg [ 0.55 lb]
Technical specification
Parameter
Minimum
Recommended range
Maximum
Fluid temperature
-30°C [-22°F]
30 to 60°C [86 to 140°F]
90° [194°F]
Fluid viscosity
4 mm
2
/s [39 SUS]
12 to 75 mm
2
/s [65 to 347 SUS]
460 mm
2
/s [2128 SUS]
Fluid cleanliness
23/19/16 (according to ISO 4406)
Operating temperature
Ambient: -30 to 60°C [-22 to 140°F]
Flow Control Spools
(FC)
Flow control spools are for work sections where you want to control the
speed (flow) of the work port
Pressure Control
Spools (PC)
Pressure control spools are for work sections where you want to control the
power (pressure) of the work port
For more information on where to use flow control or pressure control spools see application guide
AB00000079 -
“Using flow or pressure control spools”
Closed neutral
position
In neutral position and inside of the deadband area the connection to tank is
closed
Throttled open
neutral position
In neutral position and inside of the deadband area the connection to tank is 10
% of the full flow function
Open/closed neutral
position (drain)
In total neutral position the connection to tank is less than 10 % of the full flow
function. But when moving the spool out of neutral position but still within
dead band area the connection will close.
Technical Information
PVG-EX 32 Proportional Valve Group
PVBS Main Spools
©
Danfoss | June 2019
BC290860493426en-000103 | 75
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