Danfoss RA-C 15, RA-C 20 Data sheet

Data sheet

RA-C valves for cooling and heating circuits

Description

Ordering and Specification

RA-C 15 cooling valve

Together with Danfoss selfacting and electronic
controls, RA-C valves make up a perfect
combina-tion for control of cooling and heating
circuits.

The RA-C valve is a normally open valve. In an
application with self-acting sensors type FEK or FED
it is ensured that the cooling valve opens when the
room temperature is rising above the set temperature.

The RA-C valve has 4 presettings, thus the correct
quantity of water is ensured for each cooling circuit
and it is PN16 approved.

The valve has two external threads thus fittings for
various pipe types may be mounted.

Moreover, Danfoss can also offer a comprehensive
range of fittings (see back page).

RA-C 20 cooling valve

Shut-off (for isolation during system maintenance)
using manual shut off knob

Presettings:

Valve

Connections

RA -C 15 2 × G ⁄ A 0.30 0.55 0.75 0.90 1.20

RA-C 20 2 × G 1 A 0.80 1.10 1.70 2.60 3.30 013G3096

1)

The kv-val ues show the flow (Q) in m3/h at a dif ferential pressure (∆p) of 1 bar thr ough the valve. At presettin g N the kv-value is shown

at Xp = 3 K. The X p-value decreases at lowe r presettings thus the kv -value at presetting 1 is show n at Xp = 1 K.

2)

The max. di fferential pressure spe cified is the maximum pre ssure at which the valves give satisfac tory regulation. As wi th any device
which imposes a p ressure drop on the system, no ise may occur under certain f low/pressure conditions. A dif ferential pressure bet ween 0.1
and 0.3 bar ac ross the valves is recommended. T he differential pressur e can be reduced using Danfoss dif ferential pressure regul ators. 2)

3)

Shut-off PN10 approved.

kv-value1), m3/h

1 2 3 N

Max.

k

working

vs

pressure

10 ba r 0.6 bar 16 ba r 10 - 120°C

differential

3)

pressure

Max.

2)

Tes t

pressure

Water

temperature

Code No.

013G3094

Presetting With the valve body type RA-C the calculated setting

can be set easily and exactly without using special
tools:

• remove the protective cap or sensor element,

• raise the setting ring,

• turn the scale on the setting ring until the required
scale value faces the reference mark,

• release the setting ring.

The presetting can be set at the values: 1- 2 - 3 and N.
At setting N, the valve is completely open.

A setting in the shaded areas should be avoided.
When the sensor element is mounted, the pre-setting
is hidden, and is thus protected against alteration.

VD.33.U5.02 | 1

© Danfoss | 2018.12

Presetting range

①

②

Data sheet RA-C valves for cooling and heating circuits

Pressure and noise
conditions

Design

1. Gland seal

2. O-ring

3. Pressure pin

4. Seal

5. Regulation spring

6. Presetting bush

7. Valve body

8. KV-nozzle

Special demands are made on the various
components of the system. This is due to water
temperature conditions, the chosen pipe types and
pipe dimensions of both chilled ceilings and fancoils/
induction units and the structure of the cooling
circuits.

In chilled ceilings and fancoils/induction-units
relatively large differential pressure and water flow are

RA- C 15

often used compared to normal heating systems. This
may lead to noise nuisance.

The RA-C valve has especially been designed to
correspond to these demands, no matter whether
selfacting or electronic controls are used.

RA-C 20

Dimensions Materials in contact with flow medium

RA- C 15

G ⁄ A

20

66

Valve body and other metal parts Corrosion resistant brass

Spindle Corrosion resistant brass

Throttle nozzle PPS

O-rings EPDM

Valve cone NBR

Gland seal pressure pin Chrome steel

kv-nozzle PP

1)

Flow medium: water and water mixture s with secondary
coolants like gl ycols (regarding suitability an d usage especially
in not oxyge n tight systems please see the ins tructions given by
the coolant pro ducer) .

RA-C 20

G 1 A

30.5

74

1)

2 | VD.33.U5.02

© Danfoss | 2018.12