Manual

VU53F,N,S,T; VU54F,N,S,T; VU443A; VU444A; VU843A; VU844A
FAN COIL VALVES AND ACTUATORS
How to Find Valve Pressure Drop
ANSI units
The pressure drop in psi, or feet of water can be calculated
from Fig. 2 as follows:
1. Calculate the flow rate to cool and dehumidify.
2. Determine the C
v
rating of the valve.
3. Select the graph corresponding to the C
v
rating of the
valve.
1.0Cv
0.1
1
10.0
100
0.0 5.0 10.0 15.0 20.0 25.0
Pressure Drop (psi)
218
90
43.5
21.8
13.1
8.7
4.4
2.2
0.9
0.4
0.2
0.3
0.5
3
5
30
50
Flow Rate (USgpm)
1-3/4 1-3/4
A
1-3/4
(44)
1-3/4
(44)
7/8 (23)
2-Way
B
B
3-Way
A
AB
7/8 DIA.
2-3/8
2
1
(44) (44)
(22)
(60)
3-3/4
3/8
(133)
1-1/2
3/8
(38)
(10)
(10)
15/32
VU53 Valve with Actuator.
3. Draw a line from the intersection to the left edge of
the graph to determine the pressure drop in psi, or to
the right edge to determine the pressure drop in feet of
Head. (Pressure drop in feet of Head = psi X 2.2.)
2. Draw a line up from the flow rate to the intersection
of the curve.
1. Locate the flow rate at the bottom of the graph.
4. Determine the pressure drop across the valve using
the following procedures for calculating pressure drop.
VALVE BODY SIZE
A B
1/2" Sweat
1-5/16 (33) 1-5/16 (33)
3/4" Sweat
1-3/8 (35) 1-11/16 (43)
HEIGHT NEEDED TO REMOVE ACTUATOR OR COVER.
1
2
OPENING FOR 1/2 IN. CONDUIT ON OPPOSITE SITE OF MANUAL
LEVER FOR ALL MODELS.
Head(Ft.)
VU53 and VU54 Valve Dimensions with Actuator.
Fig. 1: Mounting Dimensions in in. (mm).
VU Actuator.
(12)
Fig. 2. Flow characteristics of VU53, VU54 valves, ANSI units.
4.0Cv
3.5Cv
7.0Cv
8.0Cv
95C-10885
3