Danfoss RLV-KDV Data sheet

Data Sheet

RLV-KDV H-Piece for valve radiators - blockable and

drainable, with integrated differential pressure control

Application

System

RLV-KDV is a Dynamic H-piece designed for
radiators with integrated valves (valve radiators)

integrated valve and working on optimal

conditions in full and partial demand.
in 2-pipe systems. RLV-KDV combines the
following functions:

• Integrated differential pressure controller using
membrane technology.

This results in lowered return temperature,

energy saving and preventing claims due to noise

in the radiator.

• Constant pressure over the radiator and valve in
full and partial load.

• Self-balancing to optimal pressure conditions
once the flow presetting on the integrated
radiator-valve is done.

Self sealing connection pieces ensure that

RLV-KDV can be used both for radiators

with an internal thread of G ½ and with an

external thread of G ¾ A.

• Lockshield on supply and return.

• Filling and draining possibility (with fill and
drain tap 003L0152).

• Self sealing connection pieces to the radiator for
G ½ internal thread and G ¾ external thread.

The flow adjustment presetting is done on the
radiator valve. As a result the heating system is
self balancing to the preset volume in the

A fill and drain tap is available as an accessory.

Connection to copper, soft steel, PEX and Alupex

pipes is made with Danfoss compression fittings.

See separate datasheet.

In order to avoid deposition and corrosion, the

composition of the hot water should be in

accordance with the VDI 2035 guideline

(Verein Deutscher Ingenieure).

Two-pipe system with valve radiators, typical connection types.

RLV-KD V
Straight Left

RLV-KD V
Straight Right

RLV-KD V
angle Right

RLV-KD V
angle Left

Ordering and data

Type Version

Straight R & L

RLV-KDV
with
constant
differential
pressure
control

Angle Right

Angle Left

Straight R & L

Angle Right

Angle Left

Connection

Radiator System

G ½ G ¾ A

G ¾ G ¾ A

© Danfoss Climate Solutions | 2021.06 | AI325141533218en-000102

Max.

operation

pressure

10 bar 16 bar 95 ˚C

Test

pressure

Max.
water
temp.

p min/
p max

0.15 bar /

0.60 bar

Code no.

013G7870

013G7871

013G7872

013G7873

013G7874

013G7875

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Data Sheet RLV-KDV H-Piece for valve radiators with integrated differential pressure control

Capacities

RA-N

Presetting 1 2 3 4 5 6 7 N

No Sensor Max. (l/h) 43 55 71 85 117 139 148 159

Gas Sensor

Liquid Sensor

* kv-value used for presetting of non-Danfoss integrated valves in radiators

Xp1 35 50 65 75 95 105 115 125

Xp2 35 50 65 75 110 120 135 150

Valve-kv* 0.088 0.131 0.163 0.200 0.288 0.369 0.456 0.544

Xp1 28 40 50 55 70 75 80 85

Xp2 35 50 65 75 95 105 120 130

(Capacities comply to all radiators inside a -+ 10% span depending on the radiator type and size.)

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© Danfoss Climate Solutions | 2021.06 | AI325141533218en-000102

Data Sheet RLV-KDV H-Piece for valve radiators with integrated differential pressure control

10

100

0.05

0.5

L/hr

Bar

Prese tting N

Presetting 2

Presetting 3

Presetting 4

Presetting 5

Presetting 6

Presetting 7

Presetting

1

50

120

80

40

0,10 0,350,300,250,200,15

0,450,40 0,6

70

90

60

30

20

Capacities

RA-U

Presetting 1 2 3 4 5 6 7 N

No Sensor Max. (l/h) 16 16 21 35 40 50 70 110

Gas Sensor

Liquid Sensor

* kv-value used for presetting of non-Danfoss integrated valves in radiators

Xp1 12 14 16 25 30 40 60 80

Xp2 12 14 16 25 35 45 65 100

Valve-Kv* 0.025 0.031 0.044 0.056 0.081 0.113 0.150 0.213

Xp1 10 12 14 20 25 30 45 60

Xp2 10 12 14 20 30 40 60 80

Presetting the Built-in
valve

(Capacities comply to all radiators inside a -+ 10% span depending on the radiator type and size.)

New setup with Danfoss Built-in-valve:

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When installing the Danfoss Dynamic H-Piece, then after finding the l/h needed for the radiator, go into the
graph for the valve type (N or U) and pre-set the Built-in-valve according to the graph.

Replacing old H-Piece with Dynamic H-Piece, using Danfoss Built-in-valve:

When replacing the H-Piece, first identify the Built-in-valve type mounted on radiator (N or U). This is done

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according to the Danfoss Valve Marking (see below). Hereafter, find the required l/h and use graph of the
Built-in-valve type above to find the pre-setting of the Built-in-valve.

Build-in valves from other manufacturers:

When mounting on radiator with Built-in-valve from other manufacturer, then first find the required l/h

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needed for the radiator. Thereafter, look in the graph above to find the danfoss pre-setting. Then, use Capacity
table to find the kv-valvue for the found pre-setting. Use this kv-value to pre-set the Built-in-valve with the
help from manufactures data.

© Danfoss Climate Solutions | 2021.06 | AI325141533218en-000102

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Data Sheet RLV-KDV H-Piece for valve radiators with integrated differential pressure control

Danfoss valve marking

Draining the radiator

1 2

Valve
Type

RA-N

RA-U

Marking

NA, ND, NI, NJ,
NK, NE, NM,
NL, NO, NG

UA, UD, UI, UJ,
UK, UO

To drain the radiator, first unscrew the cover caps.
Then shut off the inlet and return flow.

Accessories

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Product Code no.

Fill and drain tap without nickel plating, with ¾” external thread and hose nozzle 003L0152

Adapter including seal for valve radiator with G¾ A external thread 003L0294

Self-sealing connection nipple for valve radiator with G½ internal thread 003L0295

RLV Cover caps Ø25, M22, Nickle 003L0103

When the drain tap has been mounted (1), open
by turning the Allen key (2).

Data Sheet RLV-KDV H-Piece for valve radiators with integrated differential pressure control

Design

1. Valve radiator

2. Integrated valve

3. Self-sealing adapter DN20

4. Seal

5. Shut-off inlet

6. Shut-off outlet

7. Draining facility, outlet

8. Self-sealing adapter DN15

2

1

9. DeltaP Regulator

1

8

3

4

5

7

6

9

Materials in contact with water

Valve body and other brass parts MS58

Spring SS EN 10270-3

Membrane EPDM

O-rings EPDM/NBR

Valve plate NBR

Washer CW452K

Seal EPDM

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© Danfoss Climate Solutions | 2021.06 | AI325141533218en-000102

Data Sheet RLV-KDV H-Piece for valve radiators with integrated differential pressure control

29

70

81

50

41

52

34

50

41

52

34

50

29

32

40

50

50

32

40

34

50

34

32

40

G1/2"

G3/4"

G1/2"

G3/4"

G1/2"

G3/4"

G3/4"

G3/4"

G3/4"

G3/4"

013G7870

013G7871

013G7872

013G7873

013G7874

013G7875

G3/4"

G3/4"

50

50

50

50

50

50

Dimensions

Radiator
Connection

Version Code no.

Straight
Supply­line

013G7870

Right &
Left

Angle

G½

Supply­line

013G7871

Right



Angle
Supply­line
Left



013G7872



Straight

G¾

Supply­line
Right &
Left

Angle
Supply­line
Right

Angle
Supply­line
Left

Fill and
drain
tap





013G7874

013G7875

013G7873



003L0152

Danfoss A/S

Heating Segment, Salg Danmark • varme.danfoss.dk • [phone] • E-Mail: [e-mail]

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© Danfoss Climate Solutions | 2021.06 | AI325141533218en-000102

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