Product Overview

∆p (psi) Setting positions
Code 519502A--519566A--519599A (3/4")
Code 519600A–519609A (1") Code 519700A–519709A (1-1/4")
1 2 0.5 0 1.5
G (m
3
/h) (gpm )
∆p (psi) (m w.g.)
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
0
10
1
2
3
4
5
6
7
8
9
11
1 5 4 3 2 6 7 8 9 0
∆p (m w.g.) Setting positions ∆p (m w.g.) (psi) ∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
1 2 0
G (m
3
/h) (gpm )
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
5 0 10 15 25 20 30
3 4 5 6
40 35 45
7 8 9 10
8
1 2 0
G (m
3
/h) (gpm )
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
5 0 10 15 25 20 30
3 4 5 6
40 35
7 8 9
8
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
10
6
5
4
3
2
1
6
5
4
3
2
1
8
6
4
2
∆p (psi) Setting positions
Code 519502A--519566A--519599A (3/4") Code 519600A–519609A (1")
Code 519700A–519709A (1-1/4")
1 2 0.5 0 1.5
G (m
3
/h) (gpm )
∆p (psi) (m w.g.)
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
0
10
1
2
3
4
5
6
7
8
9
11
1 5 4 3 2 6 7 8 9 0
∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
1 2 0
G (m
3
/h) (gpm )
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
5 0 10 15 25 20 30
3 4 5 6
40 35 45
7 8 9 10
8
1 2 0
G (m
3
/h) (gpm )
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
5 0 10 15 25 20 30
3 4 5 6
40 35
7 8 9
8
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
10
6
5
4
3
2
1
6
5
4
3
2
1
8
6
4
2
∆p (psi) Setting positions
Code 519502A--519566A--519599A (3/4")
Code 519600A–519609A (1")
Code 519700A–519709A (1-1/4")
1 2 0.5 0 1.5
G (m
3
/h) (gpm )
∆p (psi) (m w.g.)
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
0
10
1
2
3
4
5
6
7
8
9
11
1 5 4 3 2 6 7 8 9 0
∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
∆p (m w.g.) Setting positions ∆p (m w.g.) (psi)
1 2 0
G (m
3
/h) (gpm )
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
5 0 10 15 25 20 30
3 4 5 6
40 35 45
7 8 9 10
8
1 2 0
G (m
3
/h) (gpm )
0
1
2
3
4
5
6
7
0
10
1
2
3
4
5
6
7
8
9
11
5 0 10 15 25 20 30
3 4 5 6
40 35
7 8 9
8
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
10
6
5
4
3
2
1
6
5
4
3
2
1
8
6
4
2
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
mH
2
O
1
2
3
4
5
6
Setting
To adjust the valve, turn the knob to the required differential pressure on
the graduated scale: the values correspond to the differential pressure in
psi or meters w.g. to open the by-pass.
For a quick setup adjustment of the differential pressure by-pass
valve, use the following manual method. As an example, a hydronic
system with several zone valves: the system must be operating, the
zone valves must be fully open and the by-pass valve must be set
to the maximum value (a) (clockwise). Gradually open the differential
pressure by-pass valve using the control knob (counterclockwise). Use
a thermometer, or simply your hand, to check that the hot water is
flowing into the by-pass circuit (b). As soon as a rise in the temperature
is noted, turn control knob (clockwise) one half turn closed so hot
water stops flowing into the by-pass (c). Lock the knob in this position
(d) with the locking screw.
Installation
The differential pressure by-pass valve can be installed in any position,
following the flow direction indicated by the arrow on the valve body.
For small to medium size systems:
Differential pressure by-pass valves are connected between the supply
and return headers of a zoned system. The differential pressure by-pass
valve can be connected at the beginning of the headers, between
the pump discharge and first zone circuit. Alternately, the ends of the
headers often provide a convenient installation location.
For medium to large size systems:
If the system flow rate is greater than the capacity of a single differential
pressure bypass valve, install the valve between the supply and return
ends of each zone circuit, rather than installing a number of valves in
parallel at the central boiler.
Hydraulic characteristics
A
C D
B