Controls and Flow Meters - Chemline Plastics Limited

Over Pressure (psi) Over Pressure (psi) Over Pressure (psi)
SB 12 Back Pressure/Relief Valves
OVER PRESSURE VS. FLOW RATE
The curves show the relationship between the over
pressure (inlet pressure above the set pressure) and
the approximate flow rate through the valve for
water at 20 O C. These values will vary depending on:
● The configuration of the piping and the pressure
losses associated with it.
● The fluid if not water at 20 O C.
● Whether the pressure is rising or falling. Hysteresis
is approximately 4 psi.
30
25
20
15
10
5
0
30
25
20
15
10
5
0
30
25
20
15
10
5
0
VALVE SIZES 3/8" and 1/2"
1 2 3 4 5 6 7 8 9 10 11
2 4 6 8 10 12 14 16 18 20 22
5 10 15 20 25 30 35 40 45 50 55
©Chemline Plastics Limited 2008
Flow Rate (USGPM)
VALVE SIZES 3/4" and 1"
Flow Rate (USGPM)
VALVE SIZES 1-1/4", 1-1/2" and 2"
Flow Rate (USGPM)
Over Pressure (psi)
Over Pressure (psi)
Over Pressure (psi)
30
25
20
15
10
5
0
30
25
20
15
10
5
0
30
25
20
15
10
5
0
VALVE SIZE 2-1/2"
standard 7.5 to150 psi spring
optional 4 to 60 psi spring
10 20 30 40 50 60 70 80 90 100 110 120 130 140
VALVE SIZE 3"
standard 7.5 to 150 psi spring
Flow Rate (USGPM)
optional 4 to 60 psi spring
20 40 60 80 100 120 140 160 180 200 220 240 260 280
VALVE SIZE 4"
standard 7.5 to 90 psi spring
Flow Rate (USGPM)
optional 4 to 60 psi spring
20 40 60 80 100 120 140 160 180 200 220 240 260 280
Flow Rate (USGPM)
ChemFlare TM Ends
● For connection to
Teflon ® tube. Leak-free
connections for difficult
services such as sodium
hypochlorite
Optional Pressure Gauge
● For inlet and/or outlet
Controls & Flow Meters CFM 5-08 17