Danfoss RA-N PURE 10, RA-N PURE 15, RA-N PURE 20 Data sheet

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Data Sheet

RA-N / RA-U PURE radiator valves with presetting

Application

Ordering and Technical Data

RA-N PURE straight RA-N PURE Angle

All RA-N/ RA-U PURE valve bodies can be used

oﬀ device is available as an accessory.

RA-U PURE

together with all types of thermostatic elements in the RA 2000 series and with TWA-A thermal actuators.

RA-N/ RA-U PURE valve bodies are manufactured from Eco brass contains less than 0.1% lead with

nickel plating. RA-N/ RA-U PURE valves are used in two-pipe heating systems and comes in series S.

The pressure pin of the gland seal is of low lead

metal and works in a lifetime lubricated O-ring. RA-N/ RA-U PURE valves are ﬁtted with a kv limiting device for pre-setting of max. water ﬂow and

The complete gland seal assembly can be

replaced without draining down the system. are available with the setting ranges: in the table below.

In order to avoid deposition and corrosion the

composition of the hot water must be in accordance Each valve body is supplied with a protective cap, which can be used for manual regulation during the construction phase. This cap must not be used

with the VDI 2035 guideline (Verein Deutscher

Ingenieure). It is recommended that formulations

containing mineral oil are avoided. as a manual shut oﬀ device. A special manual shut

Connections Pre-setting

Type Design

RA-N PURE 10 with lock

RA-N PURE 10

RA-N PURE 15

RA-N PURE 20 Straight 3/4 3/4 0.10 0.15 0.17 0.26 0.35 0.46 0.73 1.04 1.40 015G0076

Straight 3/8 3/8 0.04 0.08 0.12 0.19 0.25 0.33 0.38 0.56 0.65 015G4022

Angle 3/8 3/8 0.04 0.08 0.12 0.19 0.25 0.33 0.38 0.56 0.65 015G0071

Straight 3/8 3/8 0.04 0.08 0.12 0.19 0.25 0.33 0.38 0.56 0.65 015G0072

Angle 1/2 1/2 0.04 0.08 0.12 0.20 0.30 0.40 0.51 0.73 0.90 015G0073

Straight 1/2 1/2 0.04 0.08 0.12 0.20 0.30 0.40 0.51 0.73 0.90 015G0074

Out-

let

Rp R 1 2 3 4 5 6 7 N

kv-max.1) (m3/h at Δp = 1 bar)

Code noInlet

Quality

Type Design

RA-U PURE 10 with lock

Straight 3/8 3/8

Connection Pre-setting

Code noInlet Outlet kv-max.1) (m3/h at Δp = 1 bar)

Rp R 1 2 3 4 5 6 7 8 9 10 11 N

0.016 0.025 0.035 0.05 0.06 0.08 0.10 0.12 0.16 0.21 0.26 0.28 0.30

The kv-value indicates the water ﬂow (Q) in m3/h at a pressure drop (∆p) across the valve of 1 bar; kv = Q: √ ∆p. At setting N the

kv-value is stated according to EN 215, at XP = 2K i.e. the valve is closed at 2°C higher room temperature. At lower settings the XP value is reduced to 0.5K of the setting value 1. The kvs-value states the ﬂow Q at a maximum lift, i.e. at fully open valve at setting N.

Working pressure = static + diﬀerential pressure. The maximum diﬀerential pressure speciﬁed is the maximum pressure at

which the valves give satisfactory regulation. As with any device which imposes a pressure drop in the system, noise may occur under certain ﬂow/pressure conditions. To ensure quiet operation, maximum pressure drop should not exceed 30 to 35 kPa. The diﬀerential pressure can be reduced by the use of the Danfoss diﬀerential pressure regulators types AB-PM , ASV-P or ASV-PV.

015G3022

RA-N/ RA-U PURE valves are certiﬁed according to the European standard EN 215.

Danfoss radiator thermostats are manufactured in factories, assessed and certiﬁed by BVC (Bureau Veritas Certiﬁcation) against ISO 9001 and ISO 14001.

Datasheet

RA-N / RA-U PURE radiator valves with presetting

Accessories

Typ e Code Number

Presetting key for RA-U valves & also RA-N with lock 013G3028

p tool for pump optimization 013G7861

PFM100 measuring instrument 003L8260

PURE gland-seal 015G 0290

Service insert, Lock, RA-N 10, PURE 015G3018

Service insert, RA-N 10, PURE 015G3063

Service insert, RA-N 15, PURE 015G3073

Presetting

The presetting values of RA-N/ RA-U PURE valves can be adjusted easily and accurately without the use of tools (factory setting = N):

• Remove protective cap / thermostatic sensor

• Find reference mark

• Lift and turn setting ring until the aquired presetting aligns with the reference mark.

Presetting can be selected in steps from 1 to 7. (RA-U PURE 10 pre-setting steps from 1 to 11). At setting N the valve is fully open. This setting can be used as a ﬂushing position, if the system has to be ﬂushed out because of dirt problems. In onepipe installations, the setting N must be used.

Settings outside 1 to 7 and N should be avoided.

When the thermostatic sensor has been installed, the presetting is protected against unintended regulation.

Presetting

Reference mark

range

Factory setting and

one-pipe system

Datasheet

Operating principle

RA-N / RA-U PURE radiator valves with presetting

1. Gland seal

2. O-Ring

3. Pressure pin

4. Seal

5. Regulation spring

6. Setting dial

7. Valve body

8. kv-nozzle (Only 015G3022)

Principles

The radiator thermostats consist of the thermostatic elements of the RA 2000 series and the valve body RA-N / RA-U PURE. The element and the valve body are ordered separately.

Valve body and other metal parts Eco Brass CW724R

Setting dial PPS

O-ring EPDM

Valve cone NBR

Pressure pin and valve spring Chrome steel

Nozzle PP

The valve bodies are nickle-plated on the outside.

A clamping band with Allen screw ensures a

simple, ﬁrm connection between element and

valve body. The gland seal of the valve can be

changed in operation, i.e. with water and pressure

on the system.

Max. ambient temperature 60 ˚C

Max. medium temperature 120 ˚C

Max. working pressure 10 bar

Test pressure 16 bar

Datasheet

RA-N / RA-U PURE radiator valves with presetting

Capacities

RA-N PURE 10, Rp 3/8 connection

RA-N PURE 15, Rp 1/2 connection

Sizing example:

Required heat: 0.7 kW Cooling across radiator: 20° C Flow through

radiator: Pressure drop across valve: p = 10 kPa Valve setting: RA-N PURE 10 2

0.7

Q = = 0.03 m3/h= 0.0083 l/s

20 x 1.16

RA-N PURE 15 2 RA-N PURE 20 1

Alternatively the setting can be read directly in the table "Data and Ordering".

Q (m3/h)

kv =

√p (bar)

Datasheet

RA-N / RA-U PURE radiator valves with presetting

RA-N PURE 20, Rp 3/4 connection

RA-U PURE 10, Rp 3/8 connection

Datasheet

Dimensions

RA-N / RA-U PURE radiator valves with presetting

Straight valve with sensor RA 2990

Angle valve with sensor RA 2992

Type

RA-N PURE 10 10 Rp3/8 R 3/8 50 75 24 49 20 47 96 27 52 22 22 27

RA-N PURE 15 15 Rp1/2 R 1/2 55 82 26 53 23 47 96 30 58 26 27 30

RA-N PURE 20 20 Rp3/4 R 3/4 65 98 30 63 26 52 101 32 37

RA-U PURE 10 Rp3/8 R 3/8 50 75 96 23 27

ISO 7-1

DN D d S1 S2

L1 L2 L3 L4 L5 L6 L7 L8 L9 L10

Arc. ﬂats

Danfoss RA-N PURE 10, RA-N PURE 15, RA-N PURE 20 Data sheet

Specifications and Main Features

Frequently Asked Questions

User Manual