Danfoss VFS 2 User manual

© Danfoss | 2016.11 VD.HC.L3.02 | 1
Seated valve for steam (PN 25)
VFS 2 – 2-way valve, flange
Data sheet
Description
2-way valve VFS 2
DN kVS PN tmax. Code No.
(m3/h) (oC)
15
0.4
25 200
065B1510
0.63 0 65B1511
1.0 065B1512
1.6 065B1513
2.5 065B1514
4.0 065B1515
20 6.3 065B1520
25 10 065B1525
32 16 065B1532
40 25 065B1540
50 40 065B1550
65 63 065B3365
80 100 065B3380
100 145 065B3400
Ordering
Example:
2-way valve, DN 15, kVS 1.6, PN 25,
tmax 200 °C, flange connection
- 1× VFS 2 DN 15 valve
Code No.: 065B1513
Spare parts – stuffing box
DN Description Code No.
15
Four PTFE rings
Seal for valve cover
Gland ring
Washer
Instructions
065B0001
20
25
32
40
50
65 Three PFTE rings
Gland ring
Instructions
065B000680
100
Accessories
Type Code No.
Stem heater 24 V AC/DC
(AMV(E) 25, 35 and VFS 2 valves DN 15-50) 065B2171
Stem heater 24 V AC/DC
(AMV(E) 56 and VFS 2 valves DN 15-50) 065Z7020
Stem heater 24 V AC/DC
(AMV(E) 85, 86 and and VFS 2 valves DN
65-100)
065Z7021
Stem heater 24 V AC/DC
(AMV(E) 55, 56, 655, 658, 659 and VFS 2
valves DN 65-100)
065Z7022
Adapter AMV(E) 25 (SU/SD), AMV(E) 35
and VFS 2 DN 15-50
(for media temperatures over 150 °C)
065Z7548
Clutch
(AMV(E) 56 and VFS 2 valves DN 15-50) 065Z7551
VFS 2 valve is a range of 2 port flanged valve
for chilled water, LPHW, MPHW, HPHW (low,
medium or high pressure hot water) and steam
applications.
The valve is designed to be combined with
following actuators:
• DN 15-50 AMV(E)25 (SU/SD), AMV(E) 35,
AMV(E) 56 (with clutch 065Z7551)
• DN 65-100 AMV(E) 55, AMV(E) 56, AMV(E)85,
AMV(E) 86, AMV (E) 65x
Features:
• Logarithmic characteristic
• Control range 30:1 / 50:1 / 100:1
• Suitable for steam applications
Main data:
• DN 15-100
• kVS 0.4-145 m3/h
• PN 25
• Medium:
Circulation water/glycolic water up to 50 % /
steam (max. p = 6 bar)
• Temperature:
2 (10
1)
) … 200 °C
1) At temperatures from -10 °C up to +2 °C use stem heater
• Logarithmic characteristic
• Flange PN 25 connections
• Compliance with Pressure Equipment
Directive 2014/68/EU.

Data sheet VFS 2
2 | VD.HC.L3.02 © Danfoss | 2016.11
2-way
Capacity
Stroke
DN 15-50: EN-GJS-400-18-LT (GGG-40.3) PN 25
DN 65-100: EN-GJS-400-15 (GGG-40) PN 25
Max. closing pressure1) and recommended Δp2)
Valve Actuator
DN
Stroke
(mm)
AMV(E) 25
[AMV(E) 25 SU/SD]3) AMV(E) 35 AMV(E) 55 AMV(E) 56 AMV(E) 85, 86 AMV(E) 65x
max. closing pressure 1) (bar)
15
15
25 [223)]25 -25 - -
15 (kvs 4.0) 25 [163)]20 -25 - -
20 25 [103)]13 -25 - -
25 16 [53)] 8 - 21 - -
32 9 [2.53)] 5 - 12 - -
40 6 [23)] 3 - 8 - -
50 3 [0.53)] 2 - 5 - -
65
40
- - 4.5 313 4.5
80 - - 3 2 8 3
100 - - 1.5 1 5 1.5
NOTE:
1) Max. Δp is the physical limit of differential pressure the valve will close against. Max. Δp for stem application is 6 bar.
2) The recommended Δp is based on the generation of noise, plug erosion etc.
Max. recommended Δp is 4 bar.
If max. closing pressure is smaller than 4 bar than the recommended Δp is the same as closing Δp.
3) Values in parentheses [ ] are based on the force of the actuator AMV(E) 25 SU/SD only.
Technical data Nominal diameter DN 15 20 25 32 40 50 65 80 100
k
VS value m3/h 0.4 0.63 1.0 1.6 2.5 4.0 6.3 10 16 25 40 63 100 145
Stroke mm 15 40
Control range min. 30:1 min. 50:1 min. 100:1
Control characteristic Logarithmic
Leakage acc. to standard IEC 534
max. 0.05 % of kVS
Nominal pressure PN 25
Medium Circulation water/glycolic water up to 50 % /steam (max. ∆p = 6 bar)
Medium pH Min. 7, max. 10
Medium temperature °C 2 (–101)) … 200
Connections Flange ISO 7005-2
Materials
Body and cover Ductile iron EN-GJS-400-18-LT (GGG 40.3)
Ductile iron
EN-GJS-400-15
(GGG 40)
Cone, seat and spindle Stainless steel
Gland seal Replaceable PTFE rings
1) At temperatures from -10 °C … +2 °C use stem heater .
Pressure temperature diagram Valve characteristics-logarithmic

Data sheet VFS 2
VD.HC.L3.02 | 3
© Danfoss | 2016.11
Installation
Hydraulic connections
Mount according to flow direction as indicated
on valve body.
Valve mounting
Before mounting the valve be sure that the pipes
are clean and free from abrasion. It is essential
that the pipes are lined up squarely with the
valve at each connection and that they are free
from vibrations. Install the motorized control
valves with the actuator in a vertical or horizontal
position but not upside down.
Disposal The valve must be dismantled and the elements
sorted into various material groups before
disposal.
Tmax≤150°C for AMV(E) 25 (SU/SD), 35
Tmax≤200°C for other AMV(E)
Tmax = 150°C ... 200°C AMV(E) 25 (SU/SD), 35
Leave sufficient clearance to facilitate the
dismantling of the actuator from the valve body
for maintenance purposes.
The valve must not be installed in an explosive
atmosphere or at an ambient temperature
higher than 50 °C or lower than 2 °C. It must not
be subject to steam jets, water jets or dripping
liquid.
Note that the actuator may be rotated up to 360°
with respect to the valve body by loosening the
retaining fixture. After this operation retighten.
AMV(E) 25(SU/SD)/35
AMV(E) 85/86
Adapter for
VFS 2 DN 15-50
≈5o≈5o
AMV(E) 55/56
AMV(E) 65x

Data sheet VFS 2
4 | VD.HC.L3.02 © Danfoss | 2016.11
Examples:
1 For fluids with specific gravity of 1
(e.g. water)
Design data:
Flow rate: 6 m3/h
System pressure drop: 55 kPa
Locate the horizontal line representing a flow
rate of 6 m3/h (line A-A). The valve authority is
given by the equation:
2p1p
1p
aauthority,Valve ∆+∆
∆
=
Where:
p1 = pressure drop across the fully open valve
p2 = pressure drop across the rest of the circuit
with a full open valve
The ideal valve would give a pressure drop equal
to the system pressure drop (i.e. an authority of
0.5):
If p1 = p2
5,0
p2
p
a
1
1




In this example an authority of 0.5 would be
given by a valve having a pressure drop of 55
kPa at that flow rate (point B). The intersection
of line A–A with a vertical line drawn from B lies
between two diagonal lines; this means that no
ideally-sized valve is available. The intersection
of line A–A with the diagonal lines gives the
pressure drops stated by real, rather than ideal,
valves. In this case, a valve with kVS 6.3 would give
a pressure drop of 90.7 kPa (point C):
62.0
557.90
7.90
authorityvalvehence =
+
=
The largest valve, with kVS 10, would give a
pressure drop of 36 kPa (point D):
395.0
5536
36
authorityvalvehence =
+
=
Generally, the smaller valve would be selected
(resulting in a valve authority higher than 0.5
and therefore improved control). However, this
will increase the total pressure and should be
checked by the system designer for compatibility
with available pump heads, etc. The ideal
authority is 0.5 with a preferred range of
between 0.4 and 0.7.
2 For fluids with specific gravity (S.G. )
different from 1
Design data:
Flow rate: 6 m3/h of fluid, S.G. 0.9
System pressure drop: 10 kPa
For this example, the left hand axis of the
diagram must be ignored. Starting from the
right hand axis, the flow rate of 6 m3/h is located
(point E). The intersection of the diagonal line
from point E with a vertical line from S.G. = 0.9
(point F) gives the starting point for the effective
flow rate line G-G. The process then continues as
for Example 1, so 10 kPa intersects G-G nearest
to the kVS 16 diagonal. The intersection of G-G
with kVS 16 gives a valve pressure drop of 12.7 kPa
(point H).
Flow liquid with specific
gravity of 1
Flow liquid with specific
gravity different to 1
FLOW Pressure drop kPa (100 kPa = 1 bar = ~10 m H2O) Specific gravity
Control valve sizing diagram
for fluids

Data sheet VFS 2
VD.HC.L3.02 | 5
© Danfoss | 2016.11
mass flow of saturated water steam (kg/h) mass flow of superheated water steam (kg/h)
Saturated Sream Temperature
Absolute Inlet Pressure
Critical Pressure Drop (kPa) Superheat °C
Critical Pressure Drop (kPa)
Steam valve sizing is based on 40 % of the
absolute steam pressure (immediately upstream
of the valve), being dropped across the valve
when fully open. At this condition the steam
is travelling at or close to its critical velocity
(approx. 300 m/s) and throttling will occur over
the full valve stroke. If the steam is travelling
slower than this then the first part of the valve
stroke will merely increase the velocity of the
steam without reducing the volumetric flow.
Control valve sizing diagram for steam
Max. p in low pressure steam application variance from 0.5 bar to 6 bar (see page 2)

Data sheet VFS 2
6 | VD.HC.L3.02 © Danfoss | 2016.11
Control valve sizing diagram
for steam
(continued)
1 For saturated steam
Design data:
Flow rate: 1000 kg/h
Absolute inlet pressure: 5 bar (500 kPa)
- follow dashed line -
The absolute inlet pressure is 500 kPa. 40% of
this is 200 kPa.
Locate the diagonal line corresponding to the
pressure drop of 200 kPa (line A-A).
Read the absolute inlet pressure on the lower left
hand scale (point B), and draw a horizontal line
across until it meets the pressure drop diagonal
(A-A) at point C.
From this point extend a vertical line upwards
until it meets the horizontal line representing
the steam flow of 1000 kg/h from point D. The
intersection of this is point E.
The nearest diagonal kvs line above this is line
F-F with a kvs of 25 (point E’). If the ideal valve size
is not available the next largest size should be
selected to ensure design flow.
The pressure drop through valve at the flow rate
is found by the intersection of the 1000kg/h
line with F-F (point E’) and dropping a vertical;
this actually hits the horizontal line for 500 kPa
(point E’’) inlet pressure at a pressure drop
diagonal of 70 kPa. This is only 14 % of the inlet
pressure and the control quality will not be
good until the valve has partially closed. As with
all steam valves this compromise is necessary
since the next smaller valve would not pass the
required flow (maximum flow would have been
about 600 kg/h).
The maximum flow for same inlet pressure
is found by extending the vertical line (C-E)
through point E until it crosses the kVS 25 line F-F
(point E’’’) and reading off the flow (1700 kg/h).
2 For superheated steam
Design data:
Flow rate: 500 kg/h
Absolute inlet pressure: 5 bar (500 kPa)
Steam temperature: 190 °C
The procedure for superheated steam is much
the same as for saturated steam, but uses a
different flow scale which slightly elevates the
readings according to the degree of superheat.
- follow dotted line -
As before, the diagonal pressure drop line
A-A is located as before for 40 % of 500
(200 kg/h). The horizontal inlet pressure line
through point B is now extended to the left to
read off the corresponding saturated steam
temperature at point G (150 °C). The difference
between the saturated steam temperature and
the superheated steam temperature is
190 °C - 150 °C = 40 °C.
The superheated steam flow is found on the
upper right hand scale, point H, and the diagonal
line is followed down from here until it meets
a vertical line from the steam temperature
elevation (40 °C) at point J.
As before, the horizontal line through point B is
drawn to cut line A-A at point C and the point
where the vertical line from this point meets the
horizontal line from point J is the operating point
(point K). This horizontal line, J-K, is the corrected
flow line. The nearest diagonal line above this is
for kvs 10 (point K’). A vertical line dropped from
the intersection of J-K with the 10 kvs line intersects
the 500 kPa inlet pressure line (point K’’) at a
pressure drop diagonal of about 150 kPa. This
is about 30% of the inlet pressure which will
give reasonable control quality (compared to
recommended ratio of 40%).

Data sheet VFS 2
VD.HC.L3.02 | 7
© Danfoss | 2016.11
VFS 2 (DN 65-100) +
AMV(E) 55, 56
L
H1
min. 150
VFS 2 (DN 65-100) +
AMV(E) 65X
L
H2
min. 81
VFS 2 (DN 65-100) +
AMV(E) 85, 86
L
H3
min. 118
Dimensions
DN L H1H2H3k d n
(number)
Valve weight
(kg)
mm
65 290 484 525 568 145 18 823.0
80 310 503 544 587 160 18 828.1
100 350 530 571 614 190 22 840.7
DN L H H1k d n
(number)
Valve weight
(kg)
mm
15 130 237 383 65 14 43.6
20 150 237 383 75 14 44.3
25 160 237 383 85 14 45.0
32 180 259 405 100 18 48.7
40 200 259 405 110 18 49.5
50 230 259 405 125 18 411.7
min. 100
L
H
VFS 2 (DN 15-50) +
AMV(E) 25, 35 (SU/SD)
118. 5
adapter
065Z7548
VFS 2 (DN 15-50) +
AMV(E) 56 +
clutch 065Z7551
H1
L
min. 150

© Danfoss | DHS-SRMT/SI | 2016.11
8 | VD.HC.L3.02
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already on order pro
vided that such alterations can be made without subsequential changes being necessary eady agreed.
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Data sheet VFS 2