Danfoss RA-G Data sheet

Data Sheet

High capacity valve body, type RA-G

Application

Quality

Systems

The high capacity valves, type RA-G, are primarily
used in one-pipe systems.

All RA-G valves can be combined with all thermo­static sensors in the RA-series.

All Danfoss RA-G high capacity valves are
manufactured to the highest standards, and
are approved to the European Standard EN

215.

The RA-G valves are tted with a grey protective
cap. This protective cap must not be used as a
manual shut o device. A special manual shut o
device is available (code no. 013G3300).

The pressure pin in the gland seal is of chromium
steel and works in a lifetime lubricated O-ring. The
complete gland seal assembly can be replaced
without draining the system.

In order to avoid depositions and corrosion the
composition of the hot water must be in accord­ance with the VDI 2035 Guidelines.
It is recommended that formulations containing
mineral oil are avoided.

1. One-pipe system, ow from top 2. One-pipe system, ow from bottom

3. Zone control application. Thermal actuator TWA
in combination with room thermostat/program­mer.

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4. Danfoss Renovation+ with AB-QM and AB-QT

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Data Sheet High capacity valve body, type RA-G

Ordering

Accessories

Max
ow

temp.

Code no.

Typ e Design

Connection kv-values [m3/h] P-Band [K]

1)2)

Max. pressure

[bar]

In Out 0.5 1.0 1. 5 2.0 kvsWork. Di.3)Tes t °C

RA -G 15

RA-G 20

RA-G 25

1)

The kv-value indicates the water ow (Q) in m3/h at a pressure drop (∆p) across the valve of 1 bar. kv = V : √∆p.

The kvs-values state the ow (Q) at a maximum lift, i.e. at fully open valve.

2)

If a RAW/RAS-C/RAS-C2/RAS- D/RAX/RAE sensor or a remote sensor is used the P-band is extended by a factor 1.6.

3)

Working pressure = static + dierential pressure. The maximum dierential pressure specied is the maximum pressure

Angle Rp ½ R ½ 0.54 1.07 1.61 2.06 4.30 16 0.20 25 120 013G1676

Straight Rp ½ R ½ 0.51 0.94 1.35 1.63 2.30 16 0.20 25 120 013 G1675

Angle Rp / R / 0.57 1.11 1.16 2.20 5. 01 16 0.20 25 12 0 013G1678

Straight Rp / R / 0.54 1.07 1.61 2.06 3. 81 16 0.20 25 120 013G1677

Angle R

Straight R

R 1 0.59 1. 27 1.77 2 .41 5.50 16 0.16 25 120 013G16 80

p 1

R 1 0.57 1.16 1.71 2.27 4.58 16 0.16 25 120 013G1679

p 1

at which the valves give satisfactory regulation. As with any device which imposes a pressure drop in the system, noise
may occur under certain ow/pressure conditions. To ensure quiet operation, maximum pressure drop should not
exceed 30 to 35 kPa. The dierential pressure can be reduced by the use of the Danfoss dierential pressure regulators.

Product Size Code no.

Gland seal, 10 pcs.

RTD-CB back-ow restrictor

RTD-CB back-ow restrictor

RTD-CB back-ow restrictor

RTD-BR bypass restrictor

RTD-BR bypass restrictor

Service insert

Service insert

1)

The gland seal may be replaced with the heating system in operation.

2)

To avoid unintended heat emission from the radiator, it is recommended to install a ow restrictor, see further details

on ow restrictors in separate data sheet.

3)

Service inserts can only be replaced without water on the system.

1)

2)

2)

2)

2)

2)

3)

3)

- 013G 0290

DN 15 013 L192 5

DN 20 013 L192 6

DN 25 013 L192 7

DN 15/10 013 L1915

DN 20/15 013L1916

DN 15/ 20 013G170 6

DN 25 013G1707

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VDSXR102 © Danfoss 11/2010

Data Sheet High capacity valve body, type RA-G

Φ

[W

~ 90%

[m3/h]

RA-G solution in
one pipe system

att]

Φ

0

~30% Q0 Q

Fig. 1: Radiator curve for one-pipe installation Fig. 2

Capacities

- DN 15

Because of low dT across radiator in one-pipe sys­tem, the scope for regulation of heat emission is
narrow (at radiator curve) as gure1 shows. This
means that in a one-pipe installation extra water
in addition to the sized volume does not really
lead to any extra heat transmission.

A water quantity of 30% of the previous level
means that heat emission is reduced by ~ 10%.

A reduction of 10% of the heat emission will give
no problems in practice, since radiator surfaces
are often oversized.

1. A bypass must be established (gure 2). The
size of the bypass pipe must normally be one
dimension smaller than the dimension of the
main pipe system.

2. The RA-G - with the same dimension as the
main pipe system - is then mounted at the inlet
to the radiator.

According to this rules, the ow share into the
radiator could reach 30% of the previous level
because of the high capacity of the RA-G valve.

In case the bypass has the same diameter as the
supply pipe to the radiator, it is recommended
to use ow restrictors to provide a suitable ow
share to the radiator.

Valve capacities in combination with RA-2000 thermostatic sensor.

VDSXR102 © Danfoss 11/2010

3

Data Sheet High capacity valve body, type RA-G

Capacities

- DN 20

Capacities

- DN 25

Valve capacities in combination with RA-2000 thermostatic sensor.

Valve capacities in combination with RA-2000 thermostatic sensor.

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VDSXR102 © Danfoss 11/2010

Data Sheet High capacity valve body, type RA-G

1

Design

Dimensions

5

2

6

3

8 7

4 9 10

10. Nipple

Materials in contact with water

Valve body Ms 58 brass

O-Ring EPDM

Valve cone NBR

Pressure pin Chrome steel

Spindle guide Tin bronze

1. Gland seal

2. O-ring

3. Valve plate

4. Valve seat

5. Pressure pin

6. Valve spring

7. Spindle

8. Valve body

9. Union nut

Type

Connection ISO 7-1

DN D d

L

L

L

L

L

1

2

3

2

4

L

5

6

Spanner

L

7

S

S

1

2

RA-G 15 15 Rp ½ R½ 68 96 30 58 27 52 103 27 30

RA-G 20 20 Rp ¾ R ¾ 74 106 34 66 30 54 103 32 37

RA-G 25 25 Rp 1 R 1 90 126 42 78 34 57 106 41 46

VDSXR102 © Danfoss 11/2010

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Data Sheet High capacity valve body, type RA-G

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VDSXR102 © Danfoss 11/2010