Danfoss USV-S Data sheet
Data sheet
Balancing valves
USV-S
Application / Description
USV-S
USV-S valves are to be used in radiator heating
systems to limit the flow in risers or horizontal
loops.
USV-S valves are designed for manual hydronic
balancing of heating and cooling systems.
USV-S (black knob) is used to limit the flow
in heating or cooling installation or can work
separately as manual balancing valves for flow
limitation.
USV-S is compact valves in which the operating
elements and connections are placed within
an arc of 90°, so that in spite of small valve
dimensions, access for installation and operation
is optimal. Insulation caps for temperature up to
80 oC or 120 oC are available as accessory.
USV-S is supplied in a set-pack with internal
thread.
DEN-SMT/SI
USV-S in radiator application - vertical riser
USV-S can also be used in floor heating systems.
To limit the flow, every manifold with constant
flow should be used together with USV-S valves.
USV-S in oor heating systems
VD.C 1.N1.02 © Danfoss 06/2015
USV-S in radiator application - horizontal loop
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Data sheet Balancing valves USV-S
Application / Description
(continued)
Ordering
The USV-S valves are to be used in systems with
fan coils to limit the ow in order to provide
ecient heat distribution.
USV-S valve
k
Int. thread
Typ e DN
VS
[m3/h]
15 1,6 Rp ½
20 2,5 Rp ¾
25 4 Rp 1
32 6,3 Rp 1¼
40 10 Rp 1½
50 16 Rp 2
USV-S in cooling systems
ISO 7/1
Code No.
003Z2231
003Z2232
003Z2233
003Z2234
003Z2235
003Z2236
Accessories and spare parts
Typ e Comments/connection Code No.
Insulation cap
up to 80 °C DN 15 003L8165
DN 20 003L8166
DN 25 003L8167
DN 32 0 03L8168
DN 40 003L8169
DN 50 003L8164
up to 120 ° C DN 15 003L8170
DN 20 003 L8171
DN 25 00 3L8172
DN 32 003L 8173
DN 40 00 3L 8139
DN 50 00 3L 8138
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VD.C1.N1.02 © Danfoss 06/2015
DEN-SMT/SI
Data sheet Balancing valves USV-S
S
E
B
C
P
.A
L
L
E
N
K
E
Y
.
00
1
.0
1
Technical data
Design
1. Shut- of f knob
2. Shut-off spindle
3. Setting spindle
4. Scale disc
5. O-rings
6. Valve cone
7. Valve body
Max. working pressure ........................................ 16 bar
Test pressure ...........................................................25 bar
Max. dierential pressure across
the valve (USV-S) ............................. 1,5 bar (150 kPa)
Flow temperature ...................... -20 to 120 °C
DN
S
S
O
F
N
A
D
15 2,5
20 3
25 4
32 5
40 5
Fig. 8 USV-S
USV-S incorporates a double cone (3.6) able to
give maximum stroke limitation, thus achieving
ow limitation. It also incorporates shut o
function.
Use the following procedure to limit the ow:
• turn the valve knob ① fully counter clockwise
to open the valve. The mark on the knob will
now be opposite »0« on the scale ④.
• turn the valve knob ① clockwise to the
required setting (e.g. for setting 2.2 the knob
must be rotated two full turns and then
forward to »2« on the scale.
• hold the knob ① to keep the setting (e.g. 2.2)
and using a hexagon socket key turn the
spindle ③ fully counter clockwise (until a stop
can be felt).
Material of parts in contact with water:
Valve body, spindle, etc. ....................................... Brass
Cone ................................................................... DZR Brass
Diaphragm and O-rings ...................................... EPDM
Spring ........................................................ Stainless steel
Port A Port B
• turn the valve knob ① fully counter clockwise
so that the mark on the knob is opposite »0«
on the scale ④. The valve is now open as
many turns from the closed position (2.2) as
indicated by the convertion from required
flow.
• to annul the setting, turn the hexagon socket
key fully clockwise (until a stop can be felt).
Remember, at the same time the knob must be
held on its »0« setting.
DEN-SMT/SI
VD.C1.N1.02 © Danfoss 06/2015
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