Infloor Pressure Differential by Pass 31075, 31076, 31077 - Manual (Page 3)

➧ ➧
➧
0
0
0
0
1
1
5
2
2
10
0
.5
3
15
3
4
20
4
5
1
25
5
6
6
30
7
1
.5
8
35
7
9
40
8
10
2
45
9
3
G
(
m
3
/h
)
(gpm
)
G
(
m
/h
)
(gpm
)
0
0
1
5
2
10
3
15
4
20
5
25
6
30
7
35
8 9
40
G
(
m
3
/h
)
(gpm
)
6
Hydraulic characteristics
Part # 31075 (3/4”) Part #31076 (1”)
∆p (psi) Setting positions ∆p (psi) (m w.g.) ∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
11
10 10
11 8
10 7 7
8
11
7 10
9 9
6
8
8
8
9
6 6
8
7
6
7 5 5 5 5 7
6 6 4 4
5 4 5
4 4 6
3 5
4 4
3 3
3
2
3 2 2
2 2
1 1
1 1
0 0 0 0
2 3
4
1 2 3
2
1
1
0 0
Part # 31077 (1 1/4”)
∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
8 8
11
7 7 10
6 6 6
9
8
5 5 5 7
4 4 4 6
3 5
3 2 3
4
2
1
2 3
2
1 1
1
0 0 0
Installation
The differential pressure by-pass valve can be fitted in any position,
respecting the flow direction indicated by the arrow on the valve
body.
In systems with a traditional boiler it is normally fitted between the
system flow and return ends, which allows the control of the pressure
and the passage of a minimum flow through the heat generator.
In systems with a condensation boiler, it is preferable to fit the
by-pass directly between the upstream and downstream sections
of the pump, as this allows a higher
∆T in the circuit, with lower
return temperatures and therefore better operation of the system.
In the event of high by-pass flow rate levels, it is recommended to
fit the valve between the flow and return ends of each column,
rather than fitting a number of valves in parallel at the central boiler.
Application diagrams
Shut-off valve
Pump
RT Room thermostat
Check valve
Insulated manifold
Two way zone valve
Autoflow
Thermostatic valve
Automatic air vent
Small-medium size system
by-pass in central plant RT
RT