Danfoss VFS 2 User manual

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)

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.

Four PTFE rings

Seal for valve cover

Gland ring

Washer

Instructions

065B0001

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

) … 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

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)

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 - -

- - 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

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

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

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









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

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

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

VFS 2 (DN 65-100) +

AMV(E) 55, 56

min. 150

VFS 2 (DN 65-100) +

AMV(E) 65X

min. 81

VFS 2 (DN 65-100) +

AMV(E) 85, 86

min. 118

Dimensions

DN L H1H2H3k d n

(number)

Valve weight

(kg)

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)

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

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

min. 150

8 | VD.HC.L3.02

Danf

oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

already on order pro

vided that such alterations can be made without subsequential changes being necessary eady agreed.

All trademarks in this material are property of the respec

Data sheet VFS 2

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