Data sheet KV, KVP 04/2017 1

DescriptionFlow controller with integrated control valve – combi-val-ve, is primarily designed to control the flow of circulation water in district heating systems. The flow controller is operated by electric actuators LV.. , NV.. and EV.. (manu-factured by Belimo) and is controlled by microprocessor controller.The limitation and flow regulation is realized by means of the pressure actuator with a diaphragm and integra-ted control valve. Control valve cone is controled by the electric actuator and limited by a setting ring. Changing the position of the setting ring increases or decreases maximum flow across the valve.The pressure actuator with a diaphragm is connected to the valve entry. Pressure differance acts through the im-pulse tube on the control diaphragm and flow controller cone. Each pressure change on the valve entry, causes the movement of the control diaphragm and flow controller cone and causes increase or decrease of the valve orifice. Differential pressure across the valve is kept constant, Δpcv = 0,2 bar.

The minimal required differential pressure across the combi-valve is: ∆pvmin = Δpcv + (Q/Kvs)2

To ensure correct control function, required differential pressure across the valve must be: Δpv > Δpvmin

Q – fluid flow rate

TypesKV (PN 16) KVP (PN 25)

DNKVS

(m3/h)Stroke (mm) Type DN

KVS (m3/h)

Stroke (mm) Type

15 0,4 10 KV 015/0,4 15 0,4 10 KVP 015/0,4

15 1 10 KV 015/1 15 1 10 KVP 015/1

15 1,6 10 KV 015/1,6 15 1,6 10 KVP 015/1,6

15 2,5 10 KV 015/2,5 15 2,5 10 KVP 015/2,5

15 4 10 KV 015/4 15 4 10 KVP 015/4

20 6,3 11 KV 020/6,3 20 6,3 11 KVP 020/6,3

25 8 11 KV 025/8 25 8 11 KVP 025/8

32 12 (12,5*) 13 KV 032/12 32 12 (12,5*) 13 KVP 032/12

40 20 (16*) 13 KV 040/20 40 20 (16*) 13 KVP 040/20

50 32 (20*) 13 KV 050/32 50 32 (20*) 13 KVP 050/32

65 50 15 KV 065/50 65 50 15 KVP 065/50

80 80 18 KV 080/80 80 80 18 KVP 080/80

100 125 21 KV 100/125 100 125 21 KVP 100/125

125 180 21 KV 125/180 125 180 21 KVP 125/180

Flow Controller with Integrated Control Valve

Type: KV, KVP

* optional

Data sheet KV, KVP 04/2017 2

Technical dataValVe

Nominal diamater: DN 15 15 15 15 15 20 25 32 40 50 65 80 100 125

KVS value: (m3/h) 0,4 1 1,6 2,5 4 6,3 8 12 (12,5*) 20 (16*) 32 (20*) 50 80 125 180

Min. flow rate: (m3/h) 0,03 0,05 0,10 0,25 0,4 0,6 0,8 1,3 2,6 3,2 6 8 12,6 16

Max. flow rate: (m3/h) 0,18 0,4 0,8 1,3 2 3 4 6,5 11 (9,5*) 16 (15*) 28 40 60 80

Nominal pressure: PN (bar) 16 (KV) or 25 (KVP)

Cavitation factor z: 0,6 0,55 0,50 0,45 0,40 0,35

Leakage acc. to standard EN 60534-4 ≤0,02% Kvs ≤0,05% Kvs class III L1

Medium: Circulation water, water quality according to VDI 2035

Max. medium temperature: (°C) 150

Type of connection: Flanges (EN 1092-2)

Approx. valve weight: (kg) 7 7 7 7 7 10 10 13 15 22 39 48 71 86

Valve body material: EN-GJL-250 (KV) or EN-GJS-400-18-LT (KVP)

Gasket material: FPM, EPDM (ISO1629)

Cones, stem, seat material: WN1.4057, WN1.4404, WN1.4021

Pressure actuator

Nominal diamater: DN 15 20 25 32 40 50 65 80 100 125

Effective surface: (cm2) 80 300

Max. pressure difference: (bar) 10 (KV) or 15 (KVP)1

Diff. pressure accross the restrictor: (bar) 0,2

Diaphragm material: EPDM

Impulse tube: Ø6 Ø8 Ø10WN1.4301

Approx. weight: (kg) 2,5 7

* optional

Note1)Maximum allowable differential pressure across the valve (Δpmax), which ensures operating without cavitation is calculated from the formula: Δpmax = z∙(p1-pv). p1 – absolute inlet pressure on the valve; pv – absolute evaporation pressure at the maximum operating temperatre, z – cavitation factor.Example: Calculation of Δpmax for valve KVP 050/032, PN25. Given data: p1= 24 bar, z= 0,55, maximum temperature of circulation water is tmax = 110 °C. Solution: For the water temperature tmax

= 110°C absolute evaporation pressure is pv = 1,434 bar. Calculated maximum differential pressure is Δpmax = 0,50∙(24-1,434) = 11,3 bar.Caution: Occurrence of cavitation in the valve is harmful, causes its damage and shortens its service life.

DimensionsDN (mm) 15 20 25 32 40 50 65 80 100 125

L (mm) 130 150 160 180 200 230 290 310 350 400

h1 (mm) 170 190 205 210 220 235 355 395 435 480H (mm) 245 270 295 300 300 305 435 450 455 480

DN Nominal diameterL Distance between flangesh1 Height up to the flange axisH Height from flange axis to the top of actuator

min. 200 mm

L

Hh 1

Data sheet KV, KVP 04/2017 3

Valve with EV.. actuator(DN65 – DN125)

45°

Electric actuatorThe flow controllers are used with three types of actuators. The flow controllers from DN15 to DN32 are used with the actuators type LV.. , the controllers from DN40 to DN50 are used with the actuators type NV.. and the controllers from DN65 to DN125 with the actuators type EV.. .

InstallationRecommended instalation: Install the valve in the return flow pipe of the system. Electric actuator sho-uld be placed in upward position, at ± 45° angle to the vertical pipe axis.Permissible instalation: The valve may be installed in horizontal supply flow pipes of the system.

The installation of the strainer upstream of the valve is strongly recommended.For the valve correct function particle debris must not be in the circulating water.

Return mounting in indirectly connected heating system

Valve with NV.. actuator(DN40 – DN50)

Valve with LV.. actuator(DN15 – DN32)

Data sheet KV, KVP 04/2017 4

SizingExampleCombi valve in heating substation (HS) is used for limitation and flow regulation of circulation water in district heating system. By that way temperature regulation of circulation water in the supply line of radiator heating system is done.Given data:Qmax = 6,7 m3/h - maximum flow rate in the HS,∆pHS

= 3 bar - available pressure difference in HS,∆ppl = 0,5 bar - pressure losses in the pipe network of HS at maximum design flow.

Design

control valve cone

valve seat

pressure actuator

flow controller cone

balancing bellows

(DN65 – DN125)(DN15 – DN50)

control valve cone

valve seat

flow controller cone

pressure actuator

Pressure temperature diagram

Data sheet KV, KVP 04/2017 5

Solution:The nominal valve diameter is calculated from the formula: DN

= (354 ∙ Qmax/v)1/2

Where:v [m/s] – water velocity on the valve outlet.

The recommended water velocity on the combi valve outlet relevant for its selection is maximum 2 m/s. When that velocity is exceeded, the noise level is increased which at the same time does not mean the appearance of cavitation. DN

= (354 ∙ 6,7/2)1/2 = 34,4 mm

According to calculated value DN = 34,4 mm, selected combi valve is KV40 with following characteristics:Nominal flow coefficient of the differential pressure controller: kvs= 20,0 m3/h,

Pressure drop across the control valve with electic actuator: ∆pcv = 0,2 bar,Flow setting range for limitation: 2,6 to 11 m3/h.

The minimum required differential pressure across the combi valve for the limitation of the required flow is: Δpvmin

= Δpcv + Δpdpc = 0,2

+ (Qmax

/ kvs)2

Where:Δpcv [bar] - differential pressure on the control valve with electric actuator,Δpdpc [bar] – pressure drop on the differential pressure controller in fully open position.

Δpvmin = 0,2 + (6,7

/ 20)2 = 0,31 bar.

Available differential pressure on the combi valve in HS is:Δpv

= ∆pHS - ∆ppl

= 3 - 0,5 = 2,5 bar.

That value is greater than the minimum required of 0,31 bar and allows correct function of combi valve.

For selected combi valve KV40, water velocity on the valve outlet at the maximum design flow rate in HS is:v = 354 ∙ Qmax / DN2 = 354 ∙ 6.7/402 = 1,5 m/s.

Data sheet KV, KVP 04/2017 6

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

90

80

70

60

50

40

30

20

10

21

Flow

(m3 /h

)

Flow

(m3 /h

)

1

3

2

4

Adjustment diagram of valve KV 65-KV80

0

5

10

15

20

25

30

35

40

45

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Number of turns of adjustable nut n [ / ]

Flo

w r

ate

[m3/h

]

KV80

KV65

Adjustment diagram of valve KV 100-KV125

0

10

20

30

40

50

60

70

80

90

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Number of turns of adjustable nut n [ / ]

Flo

w r

ate

Q [

m3/h

]

KV100

KV125

43 KV/KVP 125/180

KV/KVP 100/125

21 KV/KVP 080/80

KV/KVP 065/50

KV/KVP 032/125

76 KV/KVP 050/32

KV/KVP 040/20

0

5

10

15

20

25

30

35

40

45

2 3 4 5 6 7 8 9 10 11 12 13

Pro

tok

(m3 /h

)

No0

10

20

30

40

50

60

70

80

90

4 5 6 7 8 9 10 11 12 13 14 15

Pro

tok

(m3 /h

)

No

1

2

3

4

0

2

4

6

8

10

12

14

16

18

1 2 3 4 5 6 7 8 9

Pro

tok

(m3 /h

)

No

5

6

7

KV/KVP 020/6,33

4

KV/KVP 025/8

KV/KVP 015/42 KV/KVP 015/2,51

0,0

0,5

1,0

1,5

2,0

2,5

3,0

3,5

4,0

4,5

5,0

10 2 3 4 5 6 7

Pro

tok

(m /

h3

No

1

2

3

4

0,0

0,5

1,0

1,5

2,0

2,5

3,0

3,5

4,0

4,5

5,0

10 2 3 4 5 6 7

Flow

(m /

h3

No

1

2

3

4

43 KV/KVP 125/180

KV/KVP 100/125

21 KV/KVP 080/80

KV/KVP 065/50

KV/KVP 032/125

76 KV/KVP 050/32

KV/KVP 040/20

0

5

10

15

20

25

30

35

40

45

2 3 4 5 6 7 8 9 10 11 12 13

Flow

(m3 /h

)

No0

10

20

30

40

50

60

70

80

90

4 5 6 7 8 9 10 11 12 13 14 15

Flow

(m3 /h

)

No

1

2

3

4

0

2

4

6

8

10

12

14

16

18

1 2 3 4 5 6 7 8 9

Flow

(m3 /h

)

No

5

6

7

KV/KVP 020/6,33

4

KV/KVP 025/8

KV/KVP 015/42 KV/KVP 015/2,51

Flow adjusmentAdjustment curves KV/KVP (015 – 125)

The adjustment of the flow rate is caried out by limiting the valve stroke. The set point for the valve flow limitation can be adjusted by a flow meter or by using the diagrams with adjustment curves.The set point for the flow limitation can be adjusted by turning of setting ring. X-axis values represent the numbers of full rotations of the setting ring from the lowest position on the valve neck (No). Diagram values are approximate.

Before disposal the valve must be dismantled into groups of structural components and delivered to autho-rized waste recycling organizations in order to preserve the environment. Local legislations must be obeyed when disposing of the components.

Safety instructionsControl valves are in conformity with, PED-directive 97/23/EEC. Certificate reference no: CE 1837-PED-0099.Prior to the assembly, maintenance and disassembly, the system must be depressurized, cooled down and emptied. Only authorized, trained and qualified personnel may perform activities of assembly, start-up, ope-ration and disassembly of the equipment.

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April

201

7.

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