Data sheet
AB-PM DN 40-100
VD.HR.D1.02 | 9
© Danfoss | 2018.01
Fig. 11 Setting of differential pressure is done with
standard tool
Fig. 12 Setting of flow limitation with standard tool
Fig. 13 AB-PM DN 40-50
Max. 25 Nm
Do not turn the spindle more than 20 turns as it will become disengaged.
Nominal diameter
≤Factory setting
∆p setting
1)
≤100% /0 turns
5 turns
(∆p
r
>= 20 kPa )
10 turns
(∆p
r
>= 25 kPa )
15 turns
(∆p
r
>= 30 kPa )
20 turns
(∆p
r
>= 35 kPa )
∆p
a
[kPa]
DN40
42
52
63
74
85
DN50
42
52
63
74
85
DN65
60
72
83
94
105
DN80
60
72
83
94
105
DN100
60
72
83
94
105
Table 6
1)
If application requires less dpr, for valve will be higher so flow validation across valve is needed in order to increase.
Min. differential pressure
(Δp
a
)
Setting
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.
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).
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
DN
40
50
5
5
n
Δp setting
(turns)
0 turns
Min. setting
(factory setting)
…
…
20 turns
Max. setting
Factory presetting
DN 40-50
Δp setting
min. setting (0 turns)
Flow %
100%
DN
Wrench
40-50
50
65-100
42
one turn
is 10%
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 %.