User Guide

F-27197-4 © Copyright 2008 TAC All Rights Reserved. 5
Rangeability
Rangeability is the ratio of rated flow to the minimum controllable flow through a valve. The
nominal rangeability for VB-8303 series valves is greater than 100:1.
Temperature/Pressure Ratings
See Figure-2 for temperature and pressure ratings. Consult the appropriate actuator
General Instructions sheet for the effect of ambient temperature on specific actuators.
Ratings conform with published values and disclaimer.
VB-8303-0-5-P (Flanged Cast Iron Body)
Standards: ANSI B16.1–1993
Materials: ASTM A126-93 Class B
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 102030405060708090100
Percent Valve Stem Lift
Percent Full Flo
w
"
B
"
Port
"
A
"
Port
Stem Down Stem Up
Figure-1 Typical Modified Linear Flow Characteristics
Figure-2 Temperature and Pressure Ratings for VB-8303 Series Valve Bodies
50
(345)
100
(689)
150
(1034)
200
(1379)
250
(1724)
300
(2068)
350
(2458)
400
(2758)
Pressure—psig (kPa)
50 (10)
100 (38)
150 (65)
200 (93)
250 (121)
300 (149)
165 psig
(1138 kPa)
Maximum Fluid
Temperature
281
0
F (138
0
C)
Minimum Fluid
Temperature
20
0
F (-7
0
C)
VB-8303-0-5-P
Temperature—
0
F (
0
C)