Datasheet
VHS-FN High Flow Valves for Two-Pipe
Parallel and Base-Connection Radiators
Application
An optional ll-and-drain tting is available.
To avoid the occurrence of scale and corrosion in
the system, the composition of the heating water
should comply with VDI guidelines 2035.
System layout
VHS-FN straight
The VHS-FN is the ideal control valve for modern
base-connection radiators, as well as for universal
or bathroom radiators with connection distances
of 50mm between ow and return. Quick and
easy to install, it will accept standard Danfoss
snap-lock sensor elements.
The VHS-FN incorporates a combined ow regulation and shut-o/drain device. Connection to
copper, soft steel, alupex and PEX plastic pipes
can be carried out with Danfoss clamping joints.
VHS-FN angle
To ensure an appealing nish dierent types of
valve covers are available:
In white ABS material
(RAL 9010), suitable for
wet lacquering or in
black PPO, suitable for
electrostatic powder
lacquering.
Enclosure designed
for towel dryers with
angled valves.
Ordering and data
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VHS-FN high ow valves
Connection
Type
VHS-FN 15,
angle
VHS-FN 15,
straight
Technical data
Max. water temperature 120 °C
Recommended dierential pressure 0.05-0.2 bar
Max. technical dierential pressure 0.6 bar
Testing pressure 16 bar
Max. operating pressure 10 bar
(ISO 228-1)
Radiator System ¼ ½ ¾ 1 1½ 2 3 4
R½ G¾A 0.16 0.31 0.44 0.49 0.54 0.57 0.61 0.65 0.70 013G4225
R½ G¾A 0.16 0.31 0.44 0.49 0.54 0.57 0.61 0.65 0.70 013G4226
Turns on the ow regulation screw
kv-values
1) 3)
(m3/h)
k
vs
(m3/h)
Code no.
Data sheet VHS-FN high ow valves for two-pipe systems
1)
The kv values represent the ow volume (Q) in m3/h at a pressure drop (∆p) through the valve of 1 bar. kv = Q : √∆p.
The kv-values are given for Xp = 2K.
2)
The stated maximum technical dierential pressure indicates the limit for maintaining optimum control. For low-
noise operation, system dierential pressures should be held within the recommended range. Pumps should never
be oversized; select those that generate just sucient pressure to circulate the required volume of water. From
experience, a dierential pressure of 0.05-0.2 bar across the valve is adequate in most systems. In systems where it
is too high, a Danfoss dierential pressure regulator can be used to reduce it.
3)
If sensors RAW, RAS-C, RAE or remote setting unit is used, the P-band increases by a factor of 1.6. Manufacturer’s
value is at “N” setting.
Accessories
Product Code no.
Cover* for VHS valve for panel radiators, straight pattern
White RAL 9016, suitable for wet lacquering**
Cover* for VHS valve for panel radiators, angle pattern
White RAL 9016, suitable for wet lacquering**
Cover* for VHS valve for towel rail radiators, straight pattern
White RAL 9010, suitable for wet lacquering**
Cover* for VHS valve for towel rail radiators, straight pattern
White RAL 9016, suitable for wet lacquering**
Cover* for VHS valve for towel rail radiators, angle pattern
White RAL 9010, suitable for wet lacquering**
Cover* for VHS valve for towel rail radiators, angle pattern
White RAL 9016, suitable for wet lacquering**
Cover for VHS valve, straight pattern, chrome 013G4780
Cover for VHS valve, angle pattern, chrome 013G4779
Enclosure* for VHS valve for towel rail radiators, angle pattern
White RAL 9010, suitable for wet lacquering**
Enclosure* for VHS valve for towel rail radiators, angle pattern
White RAL 9016, suitable for wet lacquering**
Sealing cone incl. seal for valve radiator with 3/4" ext. thread (20 pcs.) 003L0294
Self-sealing connection nipple for valve radiator with G½ int. thread (20 pcs.) 003L0295
Manual handwheel for all RA type valves (valve di. pressure max. 0.6 bar) 013G5002
Fill-and-drain tting, not nickel-plated, with 3/4" ext. thread and hose nozzle 003L0152
013G4774
013G4775
013G4672
013G4674
013G4671
013G4673
013G4751
013G4755
Presetting
2
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Connection bracket for sensors without snap-lock connection (10 pcs.) 013G4925
Metal cover for VHS valves, nickel-plated 003L0153
* Requires a sensor with snap-lock.
**Guidelines for lacquering are enclosed in the
product carton.
Presetting of ow is easily made with a 6 mm
Allen key:
1. Remove the metal cover.
Close the return by turning the Allen key
clockwise.
2. Set the ow by turning the Allen key
counter-clockwise, according to values given
in "Ordering and data" on page 1.
After setting, ret the metal cover.
VHS is suited for connection of copper, soft steel, PE-X
plastic and aluminium alloys. Connection is made with
the help of Danfoss clamping joints.
1.
2.
Data sheet VHS-FN high ow valves for two-pipe systems
Capacity
Draining the radiators
Capacities, using RA 2000 sensor elements at a P-band of 2 K.
The capacity range of the VHS matches today’s
Example of valve sizing:
radiator performance gures.
Heat requirement: ..........................Q = 2.3 kW
The amount by which the room temperature
changes during operation is termed the P-band
Temperature spread: ........................∆T = 20 °C
Water volume through radiator:
of a valve. This change is necessary to move the
valve from the closed position to that at which
the required volume ow (depending on dimensions) is achieved.
With the excellent control performance of RA2000
Pressure drop across the valve: ....∆p = 0.1 bar = 1 mW
Turns on the presetting screw: .....½ turn (from closed)
Alternatively, the setting can be read directly from
the “Ordering and data” table:
and RAW sensing elements, the valve should be
sized for a P-band between 0.5 and 2K to achieve
optimum energy saving under ‘small room’ temperature change conditions.
If the sensor element is removed temporarily
while the system is under pressure, it should be
replaced by an appropriate handwheel (available
from Danfoss) to ensure positive and safe shut-o.
1. Remove the metal cover, then rmly shut o
the return with an Allen key.
Q =
2.3
20 x 1.16
kv=
= 0.10 m3/h = 100 l/h
Q (m3/h)
√∆p (bar)
1.
2. Fix the drain tting in position.
Drain by turning the drain screw to the left.
The enclosed hose nozzle can be rotated
2.
freely.
Note:
The static pressure must not exceed 10 bar.
3
© Danfoss HS | 09/2015 | VDTKY302
Dan
already on order pro
All trademarks in this material are proper
Data sheet VHS-FN high ow valves for two-pipe systems
Design
1. Radiator
2. Sealing cone
3. Valve insert
4. Gland seal
5. Block-o/drain of return
6. Connection nipple
(self-sealing)
7. Flat packing
Dimensions
Materials in contact with water
Valve housing and other metal parts Ms 58
O-rings EPDM
Danfoss A/S
Heating Solutions
Haarupvaenget 11
8600 Silkeborg
Denmark
Phone:+45 7488 8000
Fax: +45 7488 8100
Email: heating.solutions@danfoss.com
www.heating.danfoss.com
foss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
© Danfoss HS | 09/2015 | VDTKY302
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vided that such alterations can be made without subsequential changes being necessary in specications already agreed.
VHS-FN, straight pattern
1/2" or 3/4" radiator connection
VHS-FN, angle pattern,
1/2" or 3/4" radiator connection
Covers are shaded grey.
ty of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
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