1
Functional Description
Pressure compensated flow control valves are designed
to provide adjustable controlled flow rates independent
of changes in inlet and/or outlet pressure.
2 way valves are used in meter-in, meter-out or bleed-off
and or parallel applications.
The flow control valve consists basically of housing (1),
throttling spool (2), spring (3), pressure compensator (4)
and a hand knob (5) with adjustment mechanism.
Flow control valve VSS1-206-A
Fluid from port A1 passes through orifice area (6) of the
throttling spool, proceeds through its internal bore to the
orifice area (7) modulated via the metering edge of the
pressure compensator (4) and onwards to port A2. The
flow rate depends on the orifice area (6) and is
determined by rotating the adjustment knob (5). The
knob can be fixed at the adjusted position via tightening
screw (9). The spring pushes both the throttling spool
and the spool of the pressure compensator to their
extreme positions and provided that there is no flow
through the valve, holds the orifice area (7) fully open. An
introduction of flow to port A1 exposes inlet pressure
through bore (8) to the bottom area of the compensator
spool and causes this spool to move in closing direction,
thus decreasing the pressure difference at the orifice
area (6) of the throttling spool. The movement of the
compensator stops as soon as a new equilibrium is
reached. The pressure compensator compares
continuously the pressure difference at the orifice area
(6) with the amount preset by the spring pretension and
modulates the orifice area (6) accordingly, thus holding
the flow rate constant.
Flow control valve VSS1-206-B
This type of valve functions on the same principle as the
previous one, however, reverse free-flow from port A2 to
port A1 is provided for by the built-in check valve.
Connection of port A1 with port P1 is ensured by cover
plate or by directional valve situated at the upper face of
housing (1) - see Functional symbols (vertical stacking
assemblies).
Flow control valve VSS1-206-C
This valve has the same function as the valve described
above, the only difference being the changed flow
direction, i.e. controlled flow in direction A2 ® A1 and
free-flow in direction A1 ® A2.
The basic surface treatment of the valve housing is
phosphate coated, whereas the surface of the other
parts are zinc coated.
q
Sandwich plate design for use in vertical stacking
assemblies
q
For use in meter-in, meter-out or bleed-off
applications
q
Available with reverse free-flow check valve
q
Flow rate setting with adjustment knob
q
Installation dimensions to
ISO 4401-AB-03-4-A and DIN 24 340 -A6
q
Subplates - see catalogue HA 0002
HA 5032
6/2012
Replaces
HA 5032 5/2008
Size 06 · p
max
320 bar · Q
max
22 L/min
2 Way Flow Control Valves
VSS1-206
P1
P2
T2
A1
A2 B2
B1
B2 A2
T1
T2
P2
P2
A2
P1
P2
A1
A2
B1
B2
T1
T2
T2
B2
A2
P2
P2
A2
B2
T2
T2
B2
A2
P2
P1
A1
B1
T1
2
HA 5032
Functional Symbols
VSS1-206-
2 way design
Nominal size
Flow Control Valve
Flow rate L/min
Q = 6,3
Q = 12
Q = 22
6,3
12
22
Model
A-02
A-11
B-11
C-11
for subplate mounting - without check valve
sandwich plate design - without check valve
sandwich plate design - with check valve,
meter-in mode
sandwich plate design - with check valve,
meter-out mode
Ordering Code
Nominal size mm 06
Maximum flow rate L/min 6,3 12 22
Minimum flow rate cm
3
/min 60
Max. operating pressure bar 320
Minimum pressure drop bar see performance curves
Hydraulic fluid Hydraulic oils of power classes (HL, HLP) to DIN 51524
Fluid temperature range for (NBR) °C -30 ... +100
Fluid temperature range for (Viton) °C -20 ... +120
Viscosity range mm
2
/s 20 ... 400
Maximum degree of fluid contamination
for Q £ (1 L/min)
for Q > (1 L/min)
Class 20/17/14 according to ISO 4406
Class 21/18/15 according to ISO 4406
Weight kg 0.8
Mounting position unrestricted
Model A-02 Model A-11
B - with check valve,
meter-in mode
C - with check valve,
meter-out mode
Model C-11
Typical application of the valve
in stacking assembly *
Typical application of the valve
in stacking assembly *
Model B-11
Seals
no designation
V
NBR
Viton
Technical Data
* Directional valve must be ordered separately.
Typical application of the valve
in stacking assembly *
A - without check valve
3
HA 5032
Characteristics
Measured at n = 32 mm
2
/s
Scale division on valve Pressure [bar]
Flow [L/min]
Flow rate dependent upon scale adjustment setting
(flow control P ® A)
Flow rate dependent upon pressure
Model
VSS1-206-6.3x-xx
Scale division on valve
Model
VSS1-206-12x-xx
Pressure [bar]
Flow [L/min]
0 50 100 150 200 250 300 320
1
2
3
4
5
6
1
2
3
4
5
6
0 1 2 3 4 5 6 7 8 9 10
0 1 2 3 4 5 6 7 8 9 10
0 50 100 150 200 250 300 320
2
4
6
8
10
12
2
4
6
8
10
12
Flow [L/min]
Flow [L/min]
4
HA 5032
Characteristics
Model
VSS1-206-22x-xx
Measured at n = 32 mm
2
/s
Scale division on valve Pressure [bar]
Flow [L/min]
Check valve
Pressure difference Dp related to flow from (A ® P)
0 5 10 15 20 25 30 32
10
15
5
20
25
30
Flow orifice open
Flow orifice closed
22
6,3
12
Flow rate dependent upon scale adjustment setting
(flow control P ® A)
Flow rate dependent upon pressure
Dp-Q Characteristics
0 50 100 150 200 250 300 320
0 1 2 3 4 5 6 7 8 9 10
1
8
12
16
20
24
4
8
12
16
20
24
22
18
14
10
6
2
Measured at n = 32 mm
2
/s
Flow [L/min]
Pressure difference Dp[bar]
Flow [L/min]
5
HA 5032
Valve Dimensions Dimensions in millimetres
Models A-11, B-11, C-11
Required surface finish of
interface
Models A-02
1 Name plate
2 O-rings, Type Square ring 012
(9.25x1.68) (4pcs.) or compatible supplied in delivery packet
3 O-rings,Type Square ring 012
(9.25x1.68) (2pcs.) or compatible supplied in delivery packet
4 Adjustment mechanism:
clockwise rotation - flow decrease
counter-clockwise rotation - flow incraese
5 Hole with set screw for fixing the handknob in set position
Cover plate DK1-06/32-3
(see HA 0003)
4 1
2 3
4 1 3
2
6
HA 5032
Caution!
The packing foil is recyclable.
The transport plate is to be returned to the supplier.
The technical information regarding the product presented in this catalogue is for descriptive purposes only. It should
not be construed in any case as a guaranteed representation of the product properties in the sense of the law.
Spare Parts
Subject to alteration without notice!
ARGO-HYTOS s.r.o.. CZ - 543 15 Vrchlabí
Tel.: +420-499-403111, Fax: +420-499-403421
E-mail: sales.cz@argo-hytos.com
www.argo-hytos.com
Seal kit
Type
Dimensions, quantity
Ordering number
Square ring O-ring
Standard NBR 70 9,25 x 1,68 (4 pcs.) - 15608800
Viton V90 - 9,25 x 1,78 (4 pcs.) 20152400
