Siemens VRD Series User Manual

VRD4 Series Double Valves Technical Instructions
Document Number CC1N7649us
September 08, 2016
Siemens AG Building Technologies Division Page 7
Gas flow charts
1 1/2" (40) 2" (50) 2 1/2" (65) 3" (80) 4" (100) 6" (150)
500
400
300
200
100
70
50
40
30
20
10
7
5
4
3
2
1
0.7
0.5
0.4
0.3
0.2
0.1
Pressure drop (in w.c.)
Natural gas
Digester gas
Propane gas
Air
5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2 3 4
5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2 3
4 5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2
4 5 7 1000 2 3 4 5 7 10000 2 3 4 5 7 100000 2 3
Flow rate (SCFH)
7649d01us/0614
Figure 2. 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 SKPx5…
actuator, with or without an AGA66.
CAUTION:
Do not oversize valves equipped with regulating actuators SKP2…, SKP5… or SKP7…
Oversizing may limit turndown and could cause oscillations.

Siemens VRD Series Specifications

General

Brand	Siemens
Model	VRD Series
Category	Control Unit
Language	English