User Guide

F-27194-5 © Copyright 2010 Schneider Electric All Rights Reserved. 5
Flow Characteristics
The flow curve shown in (Figure-1) is representative of all sizes. All valve plugs have lower
gain when nearly closed to enhance control at low demand. Two-way valves are nominally
equal percentage and normally used for water and low pressure steam.
Rangeability
Rangeability is the ratio of rated flow to the minimum controllable flow through the valve.
The nominal rangeability for VB-8223 series valves is greater than 100:1.
Temperature/Pressure Ratings
See Figure-2 for temperature and pressure ratings. Consult the appropriate actuator
General Instruction sheet for the effect of ambient temperatures on specific actuators.
Ratings conform with published values and disclaimers.
VB-8223-0-5-P (Flanged Cast Iron Body)
Standards: ANSI B16.1–1993
Materials: ASTM A126-93 Class B
Figure-1 Typical Equal Percentage Flow Characteristics
Flow
Stroke
Closed
Open
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
0%
10% 20% 30% 40% 50% 60% 70% 80% 90%
100%
Figure-2 Temperature and Pressure Ratings
for VB-8223 Series Valve Bodies
50
(345)
250 (121)
200 (93)
150 (65)
100 (38)
50 (10)
300 (149)
150
(1034)
250
(1724)
350
(2458)
100
(689)
Pressure — psig (kPa)
Temperature — °F (°C)
200
(1379)
300
(2068)
400
(2758)
Maximum Media
Temperature
281°F (138°C)
Minimum Fluid
Temperature
20°F (-7°C)
169 psig
(1166 kPa)
VB-8223-0-5-P