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SV2 Series Safety Shut-off Valves
13
V2F, V2V
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
VALVE CAPACITY CURVES
NOTES:
•
Capacities for all curves and ratings shown for G20 gas (100% CH4) with specific gravity/relative density of 0.555 at
ANSI Z21.21 standard conditions of 15.6°C/60°F and 1013.5mbar / 406.9 in w.c. / 29.2 in Hg / 14.7 PSI pressure.
•
For other gas capacities, multiply the CFH or M3/HR by:
–
G25 / 86% CH4, 14% N2
1
(sp gr/relative density
0.612) 1.05
–
Natural gas (sp gr/relative density 0.640) 1.07
–
LP/liquid propane (sp gr/relative density 1.530) 1.66
–
G31 / 100% C3H8
1
(sp gr/relative density 1.550) 1.67
1
. Per EN437.
MCR37082
1/2 INCH (DN15) FLANGE
3/4 INCH (DN20) FLANGE
1 INCH (DN25) FLANGE
1-1/4 INCH (DN32) FLANGE
2.832
28.32
283.2
0.1
1.0
10.0
100.0
100
1,000
10,000
1.0 IN (DN25) ON/OFF VALVE CAPACITY CURVES
300.0
747
249
24.9
2.49
0.249
PRESSURE DROP
-MBAR -INCHES W.C.
NATURAL GAS FLOW –CFH (CUBIC FEET PER HOUR)
–M
3
/HR (METERS CUBED PER HOUR)
1
PRESSURE DROP FORMULAS PER FLANGE SIZE AND UNIT TYPES:
A.) CFH AND IN W.C.
• 1/2 IN (DN15) = 0.00001690 X (FLOW
1.9
)
• 3/4 IN (DN20) = 0.00000931 X (FLOW
1.9
)
• 1 IN (DN25)
= 0.00000798 X (FLOW
1.9
)
• 1-1/4 IN (DN32) = 0.00000726 X (FLOW
1.9
)
B.) M
3
/HR AND MBAR
• 1/2 IN (DN15) =
0.036750 X (FLOW
1.9
)
• 3/4 IN (DN20) = 0.020240 X (FLOW
1.9
)
• 1 IN (DN25)
= 0.017359
X (FLOW
1.9
)
• 1-1/4 IN (DN32) = 0.015792
X (FLOW
1.9
)
Fig. 7: 1 in. (DN25) On/Off valve capacity curves.