5
Code*
A
B
B*
C
D
Wt
lb (kg) / C-lb (kg)
116
440A(C)
½" NPT F
2
13/16"
4
13/16
"
¾"
3"
1.6 (1.8) / 0.72 (0.82)
116
441A(C)**
½" NPT F
2
13/16"
4
13/16
"
¾"
3"
1.5 (1.7) / 0.68 (0.77)
116
450A(C)
¾" NPT F
2
13/16"
5"
¾"
3"
1.6 (1.8) / 0.72 (0.82)
116
451A(C)**
¾" NPT F
2
13/16"
5"
¾"
3"
1.5 (1.7) / 0.68 (0.77)
Dimensions
B
B’
*Models with check valve tail-piece (C) end-to-end dimension is B'.
**with integral outlet temperature gauge.
The ThermoSetter thermostatic balancing valve is designed to balance individual branches of
domestic hot water recirculation systems, based on the temperature at the valve. It automatically
modulates flow to maintain hot water availability to all fixtures in the branch circuit. The valve is at
minimum flow (Cv = .35) when the incoming water temperature is equal to the set-point position
of the adjustment dial. The valve opens as incoming water temperature drops.
For pressure loss calculations
in the recirculation system,
follow traditional pipe sizing
and head loss practices.
For pressure loss calculations
across the ThermoSetter
valve, use the design curve
shown in the graph below.
This line represents a typical
valve position under normal
working conditions (∆T=
10°F). Determine the pressure
drop across the valve by
selecting the branch design
GPM on the graph X-axis,
draw a vertical line up to
the “design” curve, then go
across to the Y-axis to find
the design pressure drop.
Include that pressure drop
in your head loss calculations
for the circuit.
Flow characteristics
2. 5
3
4.5
6 7 8.810 12
13.2
0.01
0.02
0.03
0.05
0.07
0.10
0.15
0.20
0.30
0.50
0.70
1.00
1.50
2.00
3.00
4
5
6
7.25
10
14.5
0.70
2.00
Flow rate
(/m)
(gpm)
0.40
0.30
0.12
0.10
0.08
1.40
1.80
0.90
0.60
0.30
1.20
0.16
0.20
0.50
0.60
0.90
1.00
1.80
0.36
0.48
2.40
3.00
3.60
4.20
4.80
5.40
6.00
7.80
∆
p (psi)
∆p (kPa)
0.1
0.2
0.3
0.5
0.7
1.0
1.4
2.0
3.5
7.0
11
13
20
10
˚
F
∆
T
inlet to setpoint
Operation in
by-pass mode
0.35 Cv
minimum
2.1 Cv
full open
0.69 Cv
design
