Instructions

Operating Principle
A thermostatic mixing valve mixes hot and cold
water to maintain the desired set temperature of
the mixed water at the outlet.
A thermostatic element is fully immersed into the
mixed water. It contracts or expands causing
movement of the piston, closing either the hot or
cold inlets, regulating
the flow rates entering
the valve.
If there are variations of
temperature or pressure
at the inlets, the internal
element automatically
reacts attempting to
restore the original
temperature setting.
Flow curves
Kv = 2.6
1
10
0 . 01
0
. 1
0
. 02
0
. 03
0.2
0
.5
2 5
0 .0 5
1
0.2
0
. 3
0. 5
20 50
∆p (psi)
G (l/min) (
gpm
)
10
2
3
5
2 0
0
. 01
0
. 1
0
. 02
0
. 03
0 .0 5
1
0
. 2
0
. 3
0. 5
(psi) (bar)
10
2
3
5
2 0
1 0.1
0
.2
0.5 0.05 10 2 5 2
0
0 . 001
0
. 01
0
. 002
0
. 003
0 . 0 0 5
0 . 1
0
. 02
0
. 03
0
. 05
1
. 0
0
.2
0 . 3
0
. 5
Cv = 3.0
4
0 .04
0.4
0 .04
0.4
4
0 . 0 04
0 . 0 4
0 .4
COLD
HOT
MIX
521 "A" model,
NPT male union
Inlet port check valve detail for 521 "AC" models