Danfoss AB-PM DN 40 Scheda tecnica - Pagina 9

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Data sheet
Min. differential pressure
(Δp
)
a
Setting
Design
1. Shut off knob
2. Differential pressure setting
spindle
3. Membrane
4. DP cone
5. Seat
6. Valve body
7. Control valve cone
8. Locking screw
9. Scale
10. Stuffing box
11. Spindle
12. Impulse tube
13. Brass handle
© Danfoss | 2018.01
AB-PM DN 40-100
Nominal diameter
≤Factory setting
≤100% /0 turns
DN40
42
DN50
42
DN65
60
DN80
60
DN100
60
Table 6
If application requires less dpr, for valve will be higher so flow validation across valve is needed in order to increase.
1)
The AB-PM valves are factory preset to min. Δp
setting with 100% flow.
For changing the setting please use the
following procedure:
Setting the desired differential pressure:
the setting on the AB-PM can be changed by
turning the setting spindle to allow higher
differential pressure. Turning the spindle
clockwise increases the setting; turning it
counter clockwise reduces the setting.
If the setting is not known, turn the spindle fully
clockwise. With this the setting on AB-PM is at
maximum value within setting range. Now turn
the spindle backwards a number of times (n)
as described in Fig. 13 or 14 until the required
differential pressure setting is obtained.
Fig. 11 Setting of differential pressure is done with
standard tool
Adjusting the flow limitation:
To give lower flow than factory setting the
% scale on the AB-PM need to be adjusted
according to sizing diagrams (figure 6 to 10).
Do not turn the spindle more than 20 turns as it will become disengaged.
Fig. 13 AB-PM DN 40-50
∆p setting
5 turns
10 turns
(∆p
>= 20 kPa )
(∆p
>= 25 kPa )
r
r
∆p
[kPa]
a
52
63
52
63
72
83
72
83
72
83
The calculated flow can be adjusted easily with
a standard tool. The presetting scale indicates
values from 100 % flow to 40 %. Clock wise
turning would decrease the flow value while
counter clock wise would increase it.
Danfoss recommends a presetting/flow from 40 % to 100 %.
Factory presetting is 100 %.
DN
Wrench
40-50
65-100
Fig. 12 Setting of flow limitation with standard tool
DN
40
5
Factory presetting
Δp setting
Flow %
n
(turns)
0 turns
...
20 turns
1)
15 turns
20 turns
(∆p
>= 30 kPa )
(∆p
>= 35 kPa )
r
r
74
85
74
85
94
105
94
105
94
105
50
42
one turn
is 10%
Max. 25 Nm
50
5
DN 40-50
min. setting (0 turns)
100%
Δp setting
Min. setting
(factory setting)
...
Max. setting
VD.HR.D1.02 | 9