Infloor Pressure Differential by Pass 31075, 31076, 31077 User Manual
Differential pressure by-pass valve
Code
A
B
C
D
E
Weight
(lb)
1” FNPT
1” MNPT
3
13/16
”
2
1/16
”
6
5/8
”
1.4
31076
1” FNPT
1” SWT
2
13/16
”
2
1/16
”
6
5/8
”
1.4
1
1/4
” FNPT
1
1/4
” MNPT
3
15/16
”
2
11/16
”
7
3/8
”
1.5
31077
1
1/4
” FNPT
1
1/4
” SWT
3”
2
11/16
”
7
3/8
”
1.5
E
B
D
E
B
D
E
B
D
E
B
D
E
B
D
Differential Pressure By-Pass Valve
31075-31077 series
BS EN ISO 9001:2000
Cert. n
∞ FM 21654
UNI EN ISO 9001:2000
Cert. n
∞ 0003
01007/09 NA
Function
The differential pressure by-pass valve is used in systems with a
fixed speed circulating pump supplying several zones controlled
by two way zone valves. This valve ensures that the head pressure
of the pump is proportional to the number of two way valves being
closed. It will bypass the differential pressure created by the pump
as the zone valves close, thus eliminating water hammer noise.
31077
31075
Product range
Part # 31075 Adjustable differential pressure by-pass valve with graduated scale, flow up to 9 gpm
Size 3/4" Sweat x 3/4" Sweat outlet
Part # 31076 Adjustable differential pressure by-pass valve with graduated scale, flow up to 40 gpm
Size 1” Female NPT x 1” sweat outlet
Part # 31077 Adjustable differential pressure by-pass valve with graduated scale, flow up to 45 gpm
Size 1 1/4” Female NPT + 1 1/4” sweat outlet
Technical specifications
Materials
Body:
brass
Valve plug:
brass
Valve plug gasket:
EPDM
O-R
ing
seals:
EPDM
Union seals:
asbestos free NBR
Control knob:
ABS
Spring:
stainless steel
Performance
Medium: water, glycol solutions
Max percentage of glycol: 30%
Temperature range: 32–230°F (0–110°C)
Maximum working pressure: 150 psi (10 bar)
Flow rates: 3/4” flow up to 9 gpm
1” flow up to 40 gpm
1 1/4” flow up to 45 gpm
Setting range: 1 - 6 m w.g. (2 - 10 psi)
Dimensions
519502A
519599A
519600A
519700A
519609A
519709A
1
2
3
4
5
mH2O 6
1
2
3
4
5
mH2O 6
1
2
3
4
5
mH2O 6
1
2
3
4
5
mH2O 6
1
2
3
4
5
mH2O 6
A
C
A
A
C
C
A
C
A
C
Code
A
B
C
D
E
Weight
(lb)
31075
3/4” MNPT
3/4” MNPT
2
1/4
”
1
7/8
”
5”
1
3/4” SWT
3/4” SWT
2
1/8
”
2
1/2
”
5
9/16
”
1