May I ask how double-acting and single-acting pneumatic valves are represented in a PID diagram?
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May I ask how double-acting and single-acting pneumatic valves are represented in a PID diagram?
On PID diagrams, double-acting pneumatic valves are usually represented by a box with two arrows, which point in the directions of valve opening and closing, respectively. A single-acting pneumatic valve is usually represented as a box with an arrow, the arrow indicating the direction in which the valve opens or closes. Additionally, the corresponding switch status or control signal is usually indicated on the valve as well. .