Infloor Brass Manifold - Manual (Page 11)

Operating principle
The by-bass valve contains a
non-return obturator connected to a
contrast spring. When the fixed
setting pressure is reached, the
valve obturator gradually opens,
recirculating the flow in proportion
to the closing of the thermo-electric
valves and maintaining a constant
differential pressure in the manifold
circuit.
Construction details
The differential bypass assemby
features a fixed setting that cannot
be changed because it does not
contain accessible adjustment
parts. The small, compact size and
offset connections makes this kit
particularly easy to mount after
installing thermo-electric valves on
the manifold. It does not require a
larger or deeper zone box than
those used for normal manifolds.
Hydraulic characteristics
Bypass differential pressure: 25 kPa (2500 mm w.g.)
500
10000
1000
100
G (l/h)
ΔP (mm w.g.)
2000
5000
120 140 160 180
200
250 300 350 400 450
9000
8000
7000
6000
1200
1400
1600
1800
2500
3000
3500
4000
4500
100
10
20
50
90
80
70
60
12
14
16
18
25
30
35
40
45
ΔP (kPa)
1000
600 700 800 900
1200 1400 1600 1800
2000
Technical specification
Materials: - body: brass EN 12164 CW614N
- nuts: brass EN 12165 CW617N
- Ø 18 pipe with plate: copper
- check valve obturator: PA
- spring: stainless steel
- seals: EPDM
- gaskets: asbestos-free fibre
Medium: water, glycol solutions
Max. percentage of glycol: 30%
Max. working pressure: 10 bar
Temperature range: -10–110°C
Fixed setting pressure: 25 kPa (2500 mm w.g.)
Connections: 1/2” M x 1/2” M
Dimensions
A
B
137
÷
150
C
A
1/2"
C
1.4"
B
1/2"
Code
22090
Weight (lb)
.75
Off-centre bypass assembly with fixed setting
Function
The distribution circuits of the heating fluid in radiant panel systems may be totally or partially shut off by closing the
thermoelectric valves inside the manifolds.
When the flow decreases, the differential pressure inside the circuit may rise to levels that could cause problems with noise,
high rates of fluid speed, mechanical erosion and hydraulic imbalance of the system itself. The differential bypass kit for
manifolds maintains the pressure of the flow and return manifold circuits in balance if the flow changes.
The valve can be quickly connected to the manifolds, reducing overall size to a minimum.
Product range
Part #22090 Off-centre bypass assembly with fixed setting Size 1/2” x 1/2”