Pressure independent control valve with integrated flow limiter
AFQMP 2 - return and flow mounting, adjustable setting
Description
virtus.danfoss.com
AFQMP 2 is a self-acting flow controller with
integrated control valve and with pressure
actuator with adjustable spring, developed for
the use in district heating / cooling systems. The
controller prevents flow to exceed set max flow.
Pressure actuator with adjustable spring enables
adjustment of differential pressure over the
control cone from 0.1 to 1 bar. Increased flows
can be provided. In a combination with electrical
actuators AMV(E) and ECL electronic controllers
the flow and temperature can be controlled to
achieve highest energy savings.
AFQMP 2
limiter, connection neck for electrical actuator and
a pressure actuator with one control diaphragm.
Controllers are used together with Danfoss
electrical actuators:
• AFQMP 2 PN 16/25/40 DN 65-250
- AMV(E) 655 without spring return function
- AMV(E) 658 SD 2) spring return function and
- AMV(E) 659 SD 1) spring return function;
- AMV(E) 55
• AFQMP 2 PN 16/25/40 DN 65 -125
- AMV(E) 56
1)
DIN approve d (according to EN 1457)
2)
not DIN approved
Together with Danfoss intelligent electrical
actuator AMEi 6 intelligent optimization
functions are available:
iSET-intelligent substation efficiency
iNET-intelligent pump optimization
Main data:
• DN 65-250
• kVS 60-800 m3/h
• Flow range 4.2-630 m3/h
• PN 16, 25, 40
• Differential pressure over the flow control
• Temperature:
• Connections: Flange
• AFQMP 2 combined with AMV(E) 659 SD have
has a control valve with adjustable flow
and with manual operation;
manual operation;
optimization
cone ∆pCV:
0.1-1 bar (adjustable by the spring)
- Circulation water / glycolic water up to 30 %:
2 … 150°C
Flow controller with integrated
control valve for flow rate, DN65,
kVS 60, PN 16, T
- 1× AFQMP 2 DN 65 controller
Code No.: 003G5560
The controller will be delivered
completely assembled, inclusive
impulse tubes between valve and
actuator. Electrical actuator AMV(E)
must be ordered separately.
12 . Pressure control cone (DP)13 . Impulse tube14 . Union nut15 . Cover
16. Connection for electrical
actuator
17. Pressure stuffing box
18. Setting scale
19. Setting indicator
20. Differential pressure setting
nut
SettingsDifferential pressure setting
Flow setting
Flow limitation is being done by the adjustment
of the max. flow limitation nut. The adjustment
can be performed on the basis of flow limiting
diagram (see relevant instructions) and/or by
the means of heat meter. Flow limiting curves
in diagrams represent informational values, for
Differential pressure setting is being done by the
adjustment of the setting spring for diff. pressure
control. This is done by rotating the differential
pressure setting nut. Set differential pressure
should be checked by observing the pressure
indicators.
more accurate flow limitation setting use flow/
heat meter.
Flow control cone adjusts the flow by opening
and closing. This action is provided by an electric
actuator. The max flow is limited by limiting the
maximal opening of the flow control cone. This
is done by rotating the flow limitation nut. The
pressure independent flow control is achieved by
maintaining a constant differential pressure over
the flow control cone.
The differential pressure over the flow control
cone is lead to the pressure actuator diaphragm
through the impulse tubes. It is factory preset.
The opening/closing of the pressure control cone
is performed by changing differential pressure
over the diaphragm.
When differential pressure over the flow control
cone:
a) rises, the pressure control cone takes over the
exceeded differential pressure by closing, until
set differential pressure over the flow control
cone is reached.
b) drops, the pressure control cone compensates
the missing differential pressure by opening,
until set differential pressure over the flow
control cone is reached.
Pressure actuator diaphragm is equipped
with excess pressure safety valve to protect
diaphragm from the damages caused by too
high differential pressure.
Differential pressure control
Is achieved by maintaining a constant differential
pressure over the control valve.
The differential pressure over the control valve is
lead to the pressure actuator diaphragm through
the impulse tubes.
The opening/closing of the pressure control cone
is performed by changing differential pressure
over the diaphragm.
When differential pressure over the control valve:
a) rises, the pressure control cone takes over the
exceeded differential pressure by closing, until
set differential pressure over the control valve/
application is reached.
b) drops, the pressure control cone compensates
the missing differential pressure by opening,
until set differential pressure over the control
valve/application is reached.
The pressure actuator diaphragm is equipped
with excess pressure safety valve to protect
diaphragm from the damages caused by too
high differential pressure.