How to describe this automatic control interlock?
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What is the professional term for this automatic control point shown in the diagram? What I wrote is “flow display and control for the steam pipeline, along with interlocking with the steam pipeline control valve”. Experts say that writing it this way is incorrect; this situation does not fall under interlocking. So, what is this? And what exactly is interlocking? I would appreciate your advice.
The post owner’s is a control scheme designed for regulating steam flow; it relies on the flow display from FIC1205, and the opening and closing of the FV1205 control valve are used to maintain a stable flow rate. A more appropriate name would be “Steam pipeline: flow display with flow control achieved through adjustable devices.” The explanation in the interlock manual states that process parameters are converted into standard signals using measuring instruments, which are then fed into the logic controller; the controller performs logical operations to generate control signals that determine the conditions under which equipment or devices can be started, thereby providing interlock contacts ； Or it is output to the actuator and auxiliary instruments to complete the shutdown (start-up) process of the equipment and installations. In fact, in your system, if a pressure display and a shut-off valve are installed, with the pressure signal transmitted to the control module where upper and lower limits can be set, then once the pressure exceeds these limits, an action signal is sent to the shut-off valve on site. This can be referred to as installing a pressure display on the steam pipeline, along with interlocking it with the steam pipeline shut-off valve
More detailed: steam flow display, setpoint control. Coarser: Fixed control of steam flow rate.
Can it be understood that only the installation of a shut-off valve constitutes interlocking, while the installation of a control valve merely falls under control functions?
It can create chain reactions; large fluctuations in traffic can lead to such chain reactions
Some shut-off valves are manually operated and not interlocked. Whether it is interlocked depends on whether there is an interlock symbol or not.
This post was last edited by wangduyu on 2018-4-29 07:25. Interlocking refers to different variables; this is the control loop. The representation method is shown in the attached figure
Placing the LS interlock icon from the diagram in the flow control circuit will represent the interlock control circuit. Changes in the flow signal (low low or high high) trigger the interlock control valve to close.
It is just a flow control circuit for a low-pressure steam pipeline.