1
q
Wide range of throttling oriffices
q
Two models:
- cartridge
- screw-in cartridge valve
B
A
The pressure compensated flow control valves VSK are
designed to control flow rates practically independent of
pressures and temperatures. The set up flow rate is
constant and depends on the orifice area. The 2-way
flow control valves can be used in meter-in, meter out or
bleed-off applications.
The valve consists of housing (1), throttling orifice (2),
pressure compensator (3), spring (4) and adjustment
screw (5).
Throttling in the direction A® B takes place on the
throttling area of the orifice (2). To provide for the
independence between flow rate and pressure, a
pressure compensator (3) with the metering edge (6) is
located behind the throttling orifice. The spring (4)
pushes the compensator to its extreme right position.
Provided that there is flow passing through the valve, the
input pressure acts on the face area of the pressure
compensator and shifts it to the left, thus reducing the
flow area of the metering edge (6) which results in
decreasing the pressure difference at the throttling
orifice. The movement of the compensator stops as
soon as the equilibrium is reached and the pressure
difference returns to its required value. The pressure
compensator continuously compares the pressure
difference at the orifice area (2) with the value preset by
the spring pretension and ensures the necessary
control, thus holding the flow rate constant. The flow rate
of the VSK2 can be adjusted in a small range by setting
the adjustment screw (5).
The flow rate in direction B® A is also given by the orifice
area (2), but the function of the pressure compensator is
excluded.
The function of the VSK4 is similar, but in this case, the
pressure compensator (3) is located in front of the
throttling orifice (2).
The housing of the VSK2 valve does not have any
surface treatment, the housing of the VSK4 is phosphate
coated. All the other parts are zinc coated.
B
A
VSK2
VSK4
Functional Description
VSK2
VSK4
HA 5121
6/2012
Replaces
HA 5121 5/2008
Size 06 · p
max
320 bar · Q
max
10 L/min
Constant Flow - Control Valves
VSK
2
HA 5121
Ordering Code
VSK - - /
Model
Cartridge
Screw - in cartridge
2
4
Connection thread
Metric thread (M18x1.5 for VSK2)
Metric thread (M22x1.5 for VSK4)
Pipe thread (G 3/8 only for VSK2)
M2
M4
G4
Constant Flow-Control Valve
Type
no designation Standard
Orifice diameter in mm/100
VSK2
5580100-120----160180-210230-260
VSK4
- - 100 110 120 130 135 140 150 160 180 200 - - 250 -
Nominal size mm 06
Maximum flow L/min See table of flow rates
Maximum working pressure bar 320
Minimum pressure difference bar See the performance curves
Hydraulic fluid Hydraulic oils of power classes (HL, HLP) to DIN 51 524
Fluid temperature range for (NBR) °C -30 ... +100
Viscosity range mm
2
/s 20 ... 400
Maximum degree of fluid contamination Class 21/18/15 to ISO 4406
Weight - VSK2
VSK4 with connector
kg
0,025
00,2
Mounting position unrestricted
Approximate flow rates corresponding with the orifice diameter
VSK2 VSK4
ID of the orifice
[mm/100]
Flow range L/min
adjustable through spring pretension at 32 bar
ID of the orifice
[mm/100]
Flow range L/min
an input presure 32 bar
55 0,3 - 0,6 100 2,1
80 1,4 - 1,7 110 2,4
100 1,8 - 2,4 120 3,0
120 3,1 - 4,0 130 3.8
160 5,5 - 6,5 140 4.3
180 5,6 - 7,1 150 4.9
210 8,5 - 10,8 160 6.3
230 10,7 - 13,3 180 6.6
260 12,0 - 16,4 200 8.7
250 12.5
135/S 6.0
Technical Data
3
HA 5121
Dp-Q Characteristics (B ® A) Measured at n = 32 mm
2
/s
Dp-Q Characteristics (A ® B) Measured at n = 32 mm
2
/s
Flow Q [L/min]
VSK2 VSK4
Orifice diameter (mm/100)
Orifice diameter (mm/100)
Orifice diameter (mm/100)
VSK4
Flow Q [L/min]
Flow Q [L/min]
Pressure drop Dp [bar]
Pressure drop Dp [bar]
Flow Q [L/min]
Pressure drop Dp [bar]
VSK2
Pressure drop Dp [bar]
4
HA 5121
Valve Dimensions Dimensions in millimeters
Caution!
The packing foil is recyclable.
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.
VSK2-M4-x
Cavity
VSK4-M4-x
Cavity
Controlled flow
Controlled flow
Controlled flow
1 Type designation (stamped)
2 Screw for fine flow adjustment (with VSK2 only)
- inside HEX5
- anti clockwise rotation = flow decrease
- clockwise rotation = flow increase
3 Slot for screwing-in in mounting cavity of VSK2
4 Straight connector GE10-PRL-ED
for pipe with
ÆD 10 mm
5 Wrench flats size 22 mm,
tightening torque Md = 30 Nm
6 Sealing edge
Subject to alteration without notice!
ARGO-HYTOS s.r.o. CZ - 543 15 Vrchlabí
Tel.: +420-499-403 111
E-mail: info.cz@argo-hytos.com
www.argo-hytos.com
VSK4-M4-x
B
B
A
A
VSK4-M4-x
4 516
32 1 3
