1C31227G02 Emerson ,Ovation voltage input module

Description

probably will increase significantly with use as guide surfaces and as the O-rings wear, lubrication fails, and the elastomer degrades. Thus, to ensure continued good performance, maintenance is required more often for piston actuators than for spring-and-diaphragm actuators. If that maintenance is not performed, process variability can suffer dramatically without the operator’s knowledge.

Backlash results in a discontinuity of motion when the device changes direction. Backlash commonly occurs in gear drives of various configurations. Rack-and-pinion actuators are particularly prone to deadband due to backlash. Some valve shaft connections also exhibit deadband effects. Spline connections generally have much less deadband than keyed shafts or double-D designs.

While friction can be reduced significantly through good valve design, it is a difficult phenomenon to eliminate entirely. A well-engineered control valve should be able to virtually eliminate deadband due to backlash and shaft wind-up. For best performance in reducing process variability, the total deadband for the entire valve assembly should be 1% or less. Ideally, it should be as low as 0.25%.

Actuator and positioner design must be considered together. The combination of these two pieces of equipment greatly affects the static performance (deadband), as well as the dynamic response of the control valve assembly and the overall air consumption of the valve instrumentation.

Positioners are used with the majority of control valve applications specified today. Positioners allow for precise valve assembly response, as well as online diagnostics when used with a conventional digital control system. With the increasing emphasis upon economic performance of process control, positioners should be considered for every valve application where process optimization is important.

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