Danfoss RA-C 15, RA-C 20 Data sheet [fa]

Data sheet RA-C valves

for cooling and heating circuits

Products

RA-C 15

Together with Danfoss selfacting and elec­tronic controls, RA-C valves make up a per­fect combination for control of cooling and
heating circuits.
The RA-C valve is a normally open valve. In

The RA-C valve has 4 presettings, thus the
correct quantity of water is ensured for each
cooling circuit.
The valve has two external threads thus fit­tings for various pipe types may be mounted.

RA-C 20

an application with self-acting sensors type
FEK or FED it is ensured that the cooling
valve opens when the room temperature is

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

rising above the set temperature.

Specifications

Presettings: kv-value 1), m3/h Max. Max.

Valve Code no. Connections k

RA-C 15 013G3094 2 x G 3/4 A 0.30 0.55 0.75 0.90 1.20
RA-C 20 013G3096 2 x G 1 A 0.80 1.10 1.70 2.60 3.30

1) The kv-values show the flow (Q) in m3/h at a differential pressure (Dp) of 1 bar through the valve. At presetting N the kv-value is shown at Xp
= 3 K. The Xp-value decreases at lower presettings thus the k

2) The max. differential pressure specified is the maximum pressure at which the valves give satisfactory regulation. As with any device which
imposes a pressure drop on the system, noise may occur under certain flow/pressure conditions. A differential pressure between 0.1 and 0.3
bar across the valves is recommended. The differential pressure can be reduced using Danfoss differential pressure regulators.

1 2 3 N pressure pressure

-value at presetting 1 is shown at Xp = 1 K.

v

working diff.

vs

10 bar 0.6 bar 16 bar 10 - 120 °C

Test- Water

2)

pressure temperature

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

Presetting area

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

CD-ST VD.33.U1.02 © Danfoss 06/99 1

Data sheet Climate controls: RA-C valves

Pressure and noise condi­tions

Design

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

RA-C 15

RA-C 20

relatively large differential pressure and water
flow are 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.

1. Gland seal

2. O-ring

3. Pressure pin

4. Seal

5. Regulation spring

6. Presetting bush

7. Valve body

-nozzle

8. k

v

Dimensions

RA-C 15

RA-C 20

Materials in contact with water

Valve body and other metal parts

Spindle

Throttle nozzle PPS
O-ring EPDM
Valve cone NBR
Pressure pin in gland seal Chrome steel
Nozzle PP

Corrosion­resistant brass
Corrosion­resistant brass

2 VD.33.U1.02 © Danfoss 06/99 CD-ST