Model 243 Capacity Tables
14
Orifice Size and Valve Angle
1
1
⁄
2
” and 2” Model 243-8-1 and 243-8-2 in SCFH of Natural Gas
(0.6 Specific Gravity - 14.65 psia - 60ºF)
Outlet Pressure
and Spring
Set Point 6” w.c.
1” w.c. Droop
Red-Black Spring
3
1
⁄
2
” to 6
1
⁄
2
” w.c.
143-82-021-00
Set Point 7” w.c.
1” w.c. Droop
Blue-Black Spring
5” to 8
1
⁄
2
” w.c.
143-82-021-01
Set Point 11 “ w.c.
2” w.c. Droop
Green-Black Spring
6” to 14” w.c.
143-82-021-02
Inlet
Pressure
psi
1”
3
⁄
4
”
1
⁄
2
”
3
⁄
8
”
1
⁄
4
”
0.207”
30
o
10
o
10
o
10
o
10
o
10
o
1
⁄
2
1
2
5
10
15
25
40
60
80
100
125
1
⁄
2
1
2
5
10
15
25
40
60
80
100
125
1
2
5
10
15
25
40
60
80
100
125
1100
1950
3200
5200
7400
9100
12500
1000
1600
2700
4800
7000
9100
12500
1650
2700
4800
7000
9000
11000
900
1600
2400
3900
5800
7100
8700
10500
750
1150
1800
3500
5400
7000
8700
10500
1150
2000
3800
5400
7400
8800
11000
700
1050
1550
2700
4500
5800
7200
9200
11000
11500
650
900
1350
2350
3900
5000
6600
9000
11000
11500
1000
1400
2600
4200
5500
7500
9600
11000
11500
500
750
1000
1900
3000
3800
5100
7100
9300
10500
11000
400
650
950
1600
2500
3500
5100
7100
9300
10500
11000
650
1000
1750
2800
3600
5100
7100
9300
10500
11000
350
550
950
1350
1700
2400
3200
4400
5600
7000
8000
300
450
770
1250
1700
2400
3200
4400
5600
7000
8000
300
450
900
1300
1700
2400
3200
4400
5600
7000
8000
350
550
900
1150
1500
2100
2900
3700
4500
5600
350
500
900
1150
1500
2100
2900
3700
4500
5600
350
600
900
1100
1500
2100
2900
3700
4500
5600
Note: The performance data is based on normal testing at 70
º
F flowing temperature.
Changes in performance can occur at extreme low flowing temperatures.
Last capacity figure in each group indicates maximum allowable inlet pressure (except for emergency conditions). Heavy
stepped line indicates the recommended maximum capacity and inlet pressure for each orifice for operation within the
optimum performance
range.
