© 2017 Baker Hughes, a GE company, LLC. All rights reserved.
Masoneilan SVI II ESD Installation and Maintenance Manual
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Appendix E. Air to Open and Air to Close Actuators
Actuator Action
It is important to correctly assign the sign
+
or
-
of each control variable throughout a control
system. Even the control valve subsystem can be complex. Figure 92 and Figure 93 show air to
open action, ATO, and air to close, ATC, valves used with SVI II ESD. The figures show a direct
acting positioner with linear and percentage characteristics. Some hysteresis is shown for
actuator pressure signal caused by friction in typical actuators. Scales are chosen to emphasize
relationships between input current and actuator pressure, so that the failsafe valve position is
shown at the lower left of each graph. For an ATC valve, 4 mA represents 100% valve travel not
the expected 0%. Controller and other human machine interfaces must correctly show that the
valve is fully open (100%) at 4 mA and fully closed (0%) at 20 mA. The graph shows valve
movement and actuator pressure when Tight Shutoff, T.S., option is set at about 5%, in this
example. Valve movement and actuator pressure are also shown at the low current
lift-off
point
at about 3.6 mA, below which positioner is initializing its settings until power is stabilized.
Summary of Contents for SVI II ESD
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