Siemens ACVATIX VPF43 Series Manual page 4

Technical / mechanical design
7
A
Functional principle
4 / 14
Siemens
Building Technologies
2
3
6
4
5
B
The Combi valves VPF43.. combine three functions:
 a control valve (5) for controlling the volumetric flow,
 an adjusting mechanism (1, 4) with a dial for a presettable maximum volumetric
flow,
 a differential pressure controller (3) for balancing pressure fluctuations in the
hydraulic system respectively across the control valve.
The mechanical series-connected differential pressure controller keeps the
differential pressure (p
1
volumetric flow too. The desired maximum volumetric flow can be preset with the
adjusting mechanism. The controller (not shown) and the actuator regulate the
volumetric flow and consequently the desired temperature in buildings, rooms or
zones.
P- = P/T port, pressure test point with blue ribbon (6)
P+ = P/T port, pressure test point with red ribbon (7)
p = pressure at inlet port A of Combi valve
1
p = pressure at outlet port of control valve (5)
2
p = pressure at outlet port B of Combi valve
3
Combi valves PN 16 with flanged connections
1 Ring with dial for presetting
1
2 Aperture for the differential pressure
controller is linked with outlet port B
3 Differential pressure controller
4 Plug with variable presetting opening
5 Control valve
6 Pressure test point (P/T) at outlet port
B, blue ribbon, P-
7 Pressure test point (P/T) at inlet port A,
red ribbon, P+
A Inlet port A
B Outlet port B
– p
) constant across the control valve and thus the set
2
A Inlet medium (inlet port A)
B Outlet medium (outlet port B)
1 Ring with dial for presetting
3 Differential pressure controller
5 Control valve with mounted
actuator
CE1N4315en
2017-10-25