Danfoss ASV-I Data sheet
Data sheet
Automatic balancing valve
ASV-I (DN 15-50)
Description
Ordering
NOTE: for whole range o f ASV partner
valves, spare pa rts and
accessories ple ase refer to ASV
datasheet.
ASV-I is a partner valve to be used together with
the automatic balancing valves ASV-PV/P to
control differential pressure in the risers where
the radiator valves have no presetting facilities.
It is a combined adjustment and shut-off valve
designed for installation in the flow pipe. It
incorporates flow limitation so that it can be set
for required maximum flow in the riser.
ASV-I is supplied with rectus measuring nipples
so that flow in the pipe can be measured.
The valve (DN 15 -40) is packaged in styropore
(EPS) which can be used for insulation at
temperatures up to 80 °C. An insulation cap is
available as an accessory for insulation at higher
temperatures (up to 120 °C).
ASV-I adjustment valve, inclusive two measuring nipples
k
Internal thread
Typ e DN
VS
3
(m
/h)
15 1,6 Rp ½ 003L7641 G ¾ A 003L7646
20 2,5 R
25 4,0 R
32 6,3 R
40 10 R
50 16 G 2¼ A 003L7652
(I SO 7/1) (ISO 228/1)
¾ 003L 7642 G 1 A 003L7647
p
1 003L7643 G 1¼ A 003L764 8
p
1¼ 003L764 4 G 1½ A 0 03L7649
p
1½ 003 L7645 G 1¾ A 003L76 50
p
Code No. Ty pe
External thread
Code No.
Accessories and spare parts
Technical data
© Danfoss | 2017.07
Typ e Description Comments/connection Code No.
DN 15 003L 8155
Shut-off knob for ASV-I (black)
Two test plugs and one locking plate
Plug for impulse tube connection ASV-I/M Set of 10 pieces / G ⁄ A 00 3L8174
Nominal diameter DN 15- 50
Max. pressure
Test pressure 25
Differential pressure over the valve kPa 10-150
Temperature °C –20 … 120
Material of par ts in contact with water
Valve body Brass
Membrane / O-rings EPDM
Spring Stainless steel
1)
Please no te that the maximum admissibl e differential pressure a cross the valve 150 kPa should also not be exceeded at p artial load.
bar
DN 20 003L 8156
DN 25 003L 8157
DN 32 / DN 40 / D N 50 003L 8158
For ASV-I and ASV-M,
rectus t ype (DN 15-40)
16 (PN 16)
1)
00 3L8145
VD.A9.K1.02 | 1
Data sheet Automatic balancing valves ASV-I
Application
Design
1. Shut-off knob
2. Shut-off spindle
3. Setting spindle
4. Scale disc
5. O-rings
6. Valve cone
7. Seat
8. Valve body
ASV-I has to be used as partner valve inside
control loop (Fig. 1). ASV-I and ASV-P(V) is
connected via an impulse tube, and there by
giving a constant differential pressure across the
riser and ASV-I.
This configuration offers flow limitation on the
riser however part of the controlled pressure
range is used by pressure drop on partner valve
(∆p
). It is recommended when flow limitation on
i
each terminal units is not possible.
This way it is possible to control the maximum
flow for each riser, and ensuring distribution
between them.
- partner valve inside control loop (Fig. 1).
Offers flow limitation on the riser however
part of the controlled pressure range is used
by pressure drop on partner valve (p
recommended when flow limitation on each
). It is
i
terminal units is not possible.
Fig. 1 Setting of ASV-I = ∆ p
15 2.5
DN
20 3
25 4
32/4 0/50 5
riser
+ ∆p
i
ASV-I incorporates a double cone able to give
maximum stroke limitation, thus achieving f low
limitation. It also incorporates shut off function.
ASV-I is equipped with the nipples for the f low
measurement and a connection for the ASV-I/
ASV-PV impulse tube.
Use the following procedure to limit the f low:
turn the valve knob fully counter clockwise to
open the valve. The mark on the knob will now
be opposite »0« on the scale. Turn the valve
knob 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 to keep the setting (e.g. 2.2) and using a
hexagon socket key turn the spindle fully counter
clockwise (until a stop can be felt). Turn the valve
knob fully counter clockwise so that the mark on
the knob is opposite »0« on the scale.
The valve is now open as many turns from
the closed position (2.2) as indicated by the
conversion from required f low. 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.
To read presetting valve has to be closed.
2 | © Danfoss | 2017.07
VD.A9.K1.02
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