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VGD Series Double Valves
Gas flow charts
100
2
3
4
5
7
100
2
3
7
100
2
3
100
2
3
4
3
4
5
7
10
Siemens AG Building Technologies Division
7
1000
2
3
4
5
4
5
7
1000
2
3
4
5
7
1000
2
5
7
1000
2
3
4
2
3
4
5
7
100
Figure 3. Sizing double valves
Assumptions:
1) Pressure downstream of valve is atmospheric
2) Maximum gas temperature of 140 °F
3) Valve in fully open position
NOTE:
Pressure drop is total drop across both valves when using a SKPx5.xxxU actuator,
with or without an AGA66.
CAUTION:
Do not oversize valves equipped with regulating actuators SKP2x.xxxU,
SKP5x.xxxU or SKP7x.xxxU. Oversizing may limit turndown and could cause
oscillations.
VGD20...
7
10000
2
3
4
4
5
7
10000
2
3
4
5
7
10000
2
5
7
10000
2
3
2
3
4
5
7
1000
Document Number CC1N7631us
VGD40...
5
7
100000
2
3
3
4
5
7
100000
2
3
4
5
7
100000
2
4
5
7
100000
2
3
2
3
4
5
7
Technical Instructions
November 08, 2017
´´W.C. mbar
1,000
700
500
400
1,000
300
700
200
500
400
300
100
200
70
50
100
40
30
70
50
20
40
30
10
20
7
5
10
4
3
7
2
5
4
3
1
2
0,7
0,5
1
0,4
0,3
0,7
0,2
0,5
0,4
Sp. Gr.
cf/h
Natural gas
0.64
1
cf/h
Propane gas 1.52
2
cf/h
Butane gas
2.00
3
cf/h
Air
1.00
4
m3/h
Air
1.00
4
Page 9
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