Product Overview

Installation of adjustable differential pressure by-pass valve
To mount the differential pressure by-pass valve, insert it in place of the
standard spacer. After closing the ball valves using the wrench provided,
remove the spacer, as shown in the following figure.
Hydraulic characteristic of code 519006 Differential pressure
by-pass valve
The mounting is different depending on the direction of the discharge
flow:
- By-pass valve installed with flow direction as indicated below for unit
with pump and upward discharge flow to secondary circuit on the right
side:
Hydraulic characteristics shown account for the presence
of ball valves
- By-pass valve installed with flow direction as indicated below for
unit with pump and upward discharge flow to secondary circuit
on the left side:
0 .05 .11 .16 .22 .27 .33 .4 .45 .5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
0.2
0.5
1.0
1.5
2.0
2.5
3.0
(l/s)
∆p (kPa) (psi)
0
.7
1.4
2.2
2.9
3.6
4.3
5
5.8
6.5
7.2
8
8.7
9.4
10.1
10.9
11.6
(gpm)
0 .5 1.5 2.5 3.5 4 5 6 7 7.9
Calibration
positions
Bracket installation
The mounting bracket
for wall placement
must be attached
with dowels, using the
special holes in the
base.
The HydroMixer
™
166 series unit is
applied to the bracket
using the slots under
the hex part of the shut-
off ball valves.
Wall bracket
165001
Wall mounting bracket for 166 series
units. Stainless steel.
Adjustable differential pressure by-pass valve
519006
Differential pressure by-pass valve for 166
series.
Max. operating pressure: 145 psi (10 bar)
Max. operating temperature: 212°F (100°C)
By-pass differential pressure setting range:
0.3 - 4.3 psi (2 - 30 kPa)
Connections : 1” male x 1” male (straight)
The adjustable differential pressure
by-pass valve ensures the head
pressure of the pump is proportional
to the number of two-way on/off,
modulating or thermostatic valves
being closed in the secondary
circuit, preventing pump over-
heating and excessive fluid velocity.