Working principle of the self-acting control valve SP866
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Which expert can clarify this mystery: 1. What is the working principle of the SP866 self-acting control valve shown in the attached diagram? 2. Is it post-valve pressure stabilization?
I don’t understand this diagram when watching the game. The schematic for these valves is too complicated, and there are no annotations either... Sigh... I’ve seen the schematic diagrams of other diaphragm valves before. When the valve is connected in the correct direction, the output effect is a constant current; when it is connected in the reverse direction, the output effect is a constant voltage. I guess all these things are of the same kind. .
This is called a lever-operated direct-acting self-acting control valve, which controls the pressure behind the control valve.
Whether to regulate the pressure before the valve or after it depends on the flow direction of your pipeline and the location of the pressure sensing tube – that is, whether it is located before or after the valve