Danfoss AB-PM DN 100, Datasheet, Page: 10 / 12

Data sheet AB-PM DN 40-100
10 | VD.HR.D1.02 © Danfoss | 2018.01
Fig. 14 AB-PM DN 65-100
DPCV PIBCV
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
n
Δp setting
(turns)
0
Min. setting (factory
setting)
… …
40 Max. setting
Factory presetting DN 65-100
Δp setting min. setting (0 turns)
Flow % 100%
AB-PM is a combined automatic balancing valve.
It works as differential pressure controller (DPCV)
or pressure independent control valve (PIBCV),
flow limiter and zone controller/control valve.
As DPCV it keeps a constant differential pressure
over the control loop and when installed as a
PIBCV it keeps the pressure constant over the
control valve ensuring it full authority.
Higher pressure acts on the lower side of the
control membrane (3) via an impulse tube (12)
while the lower pressure in the return pipe acts
on the upper side of the membrane (use either
membrane or diaphragm. Do not mix these
two, it will help clarity). When available pressure
increases at partial loads, the membrane closes
and thus keeps the differential pressure stable.
The control part of AB-PM is working as a
flow limiter. This enables to set a required
combination of the design flow as well as the
needed Δp. By presetting the AB-PM, the flow
rate is defined based on the pressure demand of
the loop or terminal unit.
With an actuator mounted on the valve, AB-PM
can be used as a zone valve. When the AB-PM is
converted to a PICV it can be used, together with
an actuator, as a full authority control valve with
either a linear or a logarithmic characteristic.
DN 65 80 100 DN 65 80 100
42 13 23
Do not turn the spindle more than 40 turns as it will become disengaged.