Danfoss FJV Data sheet

Data sheet

Return temperature limiter FJV (PN 16)

Description

Ordering

Example:
Return temperature limiter; DN 15;
kVS 1,9; PN 16; setting range
20…60°C; T

- 1× FJV DN 15 controller
Code No: 0 03 N5117

130°C; ext. thread

max

FJV is self-acting temperature controller used to
control:

- return water temperature from hot water
tanks in direct connected district heating
systems

- return water temperature in district heating
systems with mixing loop.

FJV Controller

k

Picture DN

15

20 3,4

25 5,5

Setting range

(°C)

20 … 60

VS

(m⁄h)

1,9

The FJV ensures that return water is cooled to
required temperature before it flows back to the
district heating plant. Controller closes on rising
temperature.

The controller has a control valve, thermostatic
actuator and handle for temperature setting.
Thermostatic actuator consist of a bellows only.

For block and district heating systems.

Main data:

• DN 15, 20, 25

• k

1,9; 3,4; 5,5 m⁄h

VS

• PN 16
Setting range: 20 … 60 °C

•

• Temperature:

- Circulation water / glycolic water up to 30 %:

2 … 130 °C

• Connections:

- Int. thread

- Ext. thread (weld-on and ext. thread

tailpieces)

Internal thread External thread

Connection

IS O 7/1

R

½

p

¾

R

p

1

R

p

Code No.

003N2250 G ¾ A 00 3N 5117

003N3250 G 1 A 0 03N 5118

003N4250 G 1¼ A 00 3N 5119

Connection

ISO 228/1

Code No.

Option:

- 1× Weld-on taipieces
Code No: 003H690 8

DEN-SMT/SI

Accessories

Picture Type designation DN Code No.

15 003H6908

Weld-on taipieces

External thread taipieces

20 003H6909

25 003H6910

15 R ½” 003H6902

20 R ¾” 003H6903

25 R 1” 003H6904

Service kits

Picture Type designation for Code No.

Repair set

Two diaphragms, two O-rings, one rubber cone, one tube of grease and eight
valve cover screws

Thermostatic actuator 20 … 60 °C 003N0084

VD.54 .H5.02 © Danfoss 03/2015

DN 15 003N4006

DN 20 003N4007

DN 25 003N4008

1

Data sheet Return temperature limiter FJV (PN 16)

Technical data

Application principle

Nominal diameter DN

k

value m⁄h

VS

Nominal pressure PN

Max. differential pressure bar

Medium

Medium pH

Medium temperature

Materials

Valve body internal thread

external thread

Valve seat

Valve cone

Spindle

Diaphragms, O-rings

o

15 20 25

1,9 3,4 5,5

16

10

Circulation water / glycolic water up to 30 %

Min. 7, max. 10

C

MS 58, hot-pressed, DIN 17660, W.No. 2.0401, CuZn40Pb3

Dezincing-free brass, BS 2872/CZ132

Cr Ni steel, DIN 17440, W.No. 1.4301

NBR-rubber

Dezincing-free brass, BS 2874/CZ132

EPDM-rubber

-25 … +130

Installation positions

FJV

FJV

1. FJV must be installed immediately
behind the hot water tank.

2. If central control of return water temperature
is required (in district heating systems with
mixing loop), FJV must be positioned so that
return water temperature from hot water tank
does not affect the element.

The controller must be installed in return
line section. It is recommended that a strainer
be inserted in the system inlet line, as shown
under “Application principle” . It can be installed
in any position, with flow in the direction of the
cast-in arrow.

FJV must not be insulated as this would aect
the valve control capability – must be allowed to
give o heat.

Installation and service are described in detail

Temperature controller

in the instructions, which is supplied with the
controller. Separate instructions are available.

2

VD.54 .H5. 02 © Danfoss 03/2015

DEN-SMT/SI

Data sheet Return temperature limiter FJV (PN 16)

Sizing

Capacity diagram, P band ~ 16 K.

Control capacity Q is given for different
differential pressures p.

Ex .1



Ex.3








Ex.2



Design

1. Handle for temperature

setting

2. Spring housing

3. Setting spring

4. Spindle guide

5. O-ring

6. Valve cover

7. Diaphragm

8. Valve cone

9. Bellows stop

10. Thermostatic actuator

11. Bellows

Example no. 1
Water volume : 1,0 m⁄ h (0,28 l/s)
Differe ntial pressure: 0,05 bar (0,5 m mp v)

= 4,5 -> kVS = 5,5

k

v

Valve selection: FJV 25

Example no. 2
Water volume: 0,5 m ⁄h (0,14 l/s)
Differe ntial pressure: 0,15 bar (1, 5 m mpv)

= 1,3 -> kVS = 1,9

k

v

Valve selection: FJV 15

Example no. 3
Water volume: 0,6 m⁄ h (0,17 l/s)
Differe ntial pressure: 0,04 bar (0,4 m mp v)

= 3,0 -> kVS = 3,4

k

v

Valve selection: FJV 20

DEN-SMT/SI

VD.54 .H5. 02 © Danfoss 03/2015

3

Data sheet Return temperature limiter FJV (PN 16)

Settings

Dimensions

Temperature setting

FJV have numbered neutral scale. The drawing
shows the relation between scale numbers and
return water temperature.

Values given are indicative only.

Scale setting

Closing temperature

FJV with internal thread FJV with external thread

H

H

1

Typ e

FJV 15 71 133 72 141 149 75 R

FJV 20 71 133 90 154 164 80 R

FJV 25 76 138 95 168 167 83 R

4

VD.54 .H5. 02

mm

2

mmLmmL2mmL3mmL4mm

a

IS O 7/1

(int. thread)

½ G ¾A

p

¾ G 1A

p

1 G 1¼ A

p

b

ISO 228/1

(ext. thread)

Produce d by Danfoss A/S © 03/2015