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VVVP445...and VXP45... Series Two-port and Three-port Seat Valves
ANSI Class 250
Sizing
Warning/Caution
Notations
Control
Characteristics
Engineering Notes
Recommendation
Siemens Building Technologies, Inc.
Water Sizing Equation:
Q
=
C
v
∆
p
Where:
C
= Flow Coefficient
v
Q = Volumetric flow rate (gpm)
∆p = Pressure drop, psi
WARNING:
CAUTION:
V
100
1
0,8
0,6
A
AB
0,4
B
0,2
0
0
0,2 0,4 0,6 0,8
H
0
CAUTION:
The VXP45...can only be used as mixing valves.
Valves VVP45... and VXP45... are preferably installed in the return, as this provides
lower temperatures on the seals.
Provide strainer upstream of the valve inlet.
AB
A
Figure 1. VVP45.
Personal injury, or loss of life may
occur if you do not follow the
procedures as specified.
Equipment damage, or loss of data
may occur if you do not follow the
procedures as specified.
Legend:
V
= Volumetric flow rate
100
= Valve stroke 0% = Path A → AB closed,
H
0
bypass B opened
= Valve stroke 100% = Path A → AB opened,
H
100
bypass B closed
= Constant total flow from A and B → AB
Tor AB
Tor A
= Variable flow in straight-through path
from A → AB
Tor B
= Variable flow in bypass-through port
1
from B → AB
H
100
AB
Technical Instructions
Document Number CM1N4845E-P25
Rev. 4, February, 2002
Two-port valves VVP45...
Flow permissible only in direction
of arrow from A → AB arrow on
valve body.
A
AB =
Variable flow in straight-
through port (outlet).
A
=
Variable flow in straight-
through port (inlet).
Stem retracted: Path A → AB
open.
Stem extended: Path A → AB
closed.
Page 3
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