Product Overview

4/8
Siemens 2-port and 3-port valves with T-bypass PN 16 CE1N4854en
Building Technologies 17.12.2010
0,8
1
0,6
0,4
0,2
0
0 0,2 0,4 0,6 0,8 1
B
A
B
A
A
B
4845D02
ABA
B
H
100
H
0
V
100
The k
vs
-values in T-bypass B represent only 70 % of the k
vs
-value in the straight-
through control path A  AB (for other types 100 %). This compensates for the flow
resistance of the heat exchanger or radiator, so keeping the overall flow rate,

V
100
as
constant as possible.
Engineering notes
Valve construction
Valve
series
Valve flow in control mode Valve stem
Inlet A Inlet B Outlet AB Retracts extends
2-port valves
4845Z12
AB
VVP45..S
A
AB
variable
variable
A
AB
opens
A
AB
closes
3-port valves with T-bypass
A
4845Z14
B
AB
VMP45..S
A
AB
B
variable variable constant
A
AB
opens
B
AB
closes
A
AB
closes
B
AB
opens
The direction of flow MUST be as indicated by the arrow, i.e. only from
A  AB and B  AB.
The 3-port valve types VMP45..S may only be used in mixing applications
We recommend installation in the return pipe, as the temperatures in this pipe are lower
for applications in heating systems, which in turn, extends the stem sealing gland's life.
Always use a strainer upstream of the valve to increase the valve's functional safety.
Mounting notes
Both valve and actuator can easily be assembled at the mounting location. Neither
special tools nor adjustments are required.
The valve is supplied with Mounting Instructions 4 319 9526 0.
Valve flow
characteristic
Warning!
Recommendation: