Presetting Valve Type RA-N with Flange Connection

Application

The RA-N valve, code no. 013G1843, is speciallydesigned for Russain convectors with 50 mm bot-tom connection.

The valve body is designed for two-pipe pumpedsystems in commercial or domsetic heating sys-tems. RA-N has a built-in facility for setting max.flow through the convector.

The setting options range from kv = 0.08 - 0.67m3/h. Kvs = 0.88 m3/h

The valve is deliveres assembled including moun-ted air ventilation screw and protective cap, red.

All Danfoss thermostatic sensors in the RA seriescan be combined with the RA-N valve.

In order to avoid deposition and corrosion, thecomposition of the hot water must be in accord-ance with the VDI 2035 guideline (VereinDeutscher Ingenieure).

System

Presetting Presetting area

Reference mark

The presetting values of the integrated valvescan be adjusted easily and accurately without theuse of tools (factory setting: ‘N’):

▪ Remove the protective cap or the thermo-static sensor

▪ Find the reference mark▪ Turn the setting ring until the desired pre-

setting number aligns with the referencemark.

Data Sheet

Presetting Valve Type RA-N with Flange Connection

Danfoss Heating Solutions VDGWG102 © Danfoss 10/2012 1

Presetting can be selected within the range of 1to 7. At setting ‘N’ the valve is fully open. Settingin the shaded areas of the drawing should beavoided.

Setting ‘N’ is used when flushing the system.

When the thermostatic sensor is fitted, the pre-setting is hidden and thus protected against un-intended alteration.

Technical Data kv-values1)

Setting 1 2 3 4 5 6 7 N Kvs N

kv-value 0.08 0.12 0.18 0.25 0.32 0.42 0.53 0.67 0.88

Code no. Max. watertemp.

Differential pressure 2) Test pres-sure

Work. pres-sureRec. Tech.

°C bar bar bar bar013G1843 120 0.05-0.2 0.6 25 16

1) The kv-value indicates the water flow (Q) in m3/h at a given lift and a pressure drop (∆p) acrossthe valve at 1 bar. kv = Q / √∆p . At setting „N“ the kv-value is stated according to EN 215, at Xp =2 K. At lower presetting values Xp is reduced to setting 1, Xp = 0.5. At presettings between„1“ and „N“, Xp is between 0.5 and 2 K.

2) Xp = 2 K means that the valve is closed at 2 °C higher room temperature. The kvs-value states theflow Q at a maximum lift, i.e. at fully open valve. The max. differential pressure specified is themaximum pressure at which the valve gives satisfactory regulation. As with any device which im-poses a pressure drop on the system, noise may occur under certain flow/pressure conditions. Adifferential pressure between 0.1 and 0.3 bar across the valve is recommended. The differentialpressure can be reduced using Danfoss differential pressure regulators.

Design Materials in contact with water :

Valve body and other metal parts Ms 58 brassThrottle nozzle and spindle PPSO-ring EPDMValve cone NBRPressure pin in gland seal Chrome steel

Accessories Gland seal

Should the valve body gland seal show signs ofleaking, the gland can be replaced quickly with-out draining down the system.

Gland seals are delivered in boxes of 10 unitscomplete with instructions. Code no.: 013L0669

Important

After mounting the gland seal, press pin firmly toensure proper contact to the valve spindle.

Data Sheet Presetting Valve Type RA-N with Flange Connection

2 VDGWG102 © Danfoss 10/2012 Danfoss Heating Solutions

Dimensions

26

11

29

23

13,5

51

81,5

G3/4 A ISO 228/1

G3/4 A ISO 228/1

Convector Integration

80

50

DETAIL A

SCALE 1:2,5

A

B

50

26±0,3

0,5 A

40±0,3

25

30

80

UNION NUT

UNION NUT

0,2 B

PIPE CONNECTION

SCALE 1:2,5

ma

x. ø

21

,4

ma

x.

17

23

,7±

0,2

R0,5

2,5±0,5

1,6

SCALE 1:1

0,1

Sizing Example Known values

Heat demand: Φ = 1500 kcal/hSystem temperature drop: ∆t = 20 °CDifferential pressure: ∆p = 0.10 bar

Calculation

Water quantity Q (Φ/∆t) = 1500/20 = 75 l/h

Kv= = = 0.23 m3/hQ

√∆p

0.075

√0.1

The setting is found in the capacity diagrammebelow: Presetting 3.If the sizing point found is between two settings,the highest setting is chosen.Alternatively, the settings can be found directlyin the table technical data.



Capacity Diagramme (without radiator and tubing)

5 7 10 20 30 40 50 70 100 200 300 400 500 700 1000

1

2

3

4

5

6

8

kPa

20

30

40

5060

80

1001

0,8

0,6

0,5

0,4

0,3

0,2

0,1

0,08

0,06

0,05

0,04

0,03

0,02

0,01

10

pp

Q [l/h]

[ ][bar ]

0,1

0,2

0,3

0,4

0,5

0,6

0,8

1

2

3

4

5

6

8

10

p

1 2 3 4 5 6 7 N

107543210,70,50,40,30,20,1

200,2 0,3 0,4 0,5 0,7 1 2 3 4 5 7 10

kW

kW

t=15 Co

ot=20 C

]mwg[

2000

20 30

30 40

2t=10 C 0,40,1o

0,2 0,3 0,5 0,7 1 103 4 75 20 kW0,07

013G1843 RA-N

Instructions 1) 2)

3) 4)



5) 6)Max. temperature

120ºCMax. temperature

120ºC60Nm




Danfoss A/SHeating SolutionsHaarupvaenget 118600 SilkeborgDenmarkPhone: +45 7488 8000Fax: +45 7488 8100Email: [email protected]

Danfoss 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 productsalready on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed. All trademarks in this material are property of the respectivecompanies. Danfoss Heating Solutions and the Danfoss Heating Solutions logotype are trademarks of Danfoss A/S. All rights reserved.


Presetting Valve Type RA-N with Flange Connection

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