Questions about step-by-step control
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In proportional control, if the valve opening is 80% and valve B is open to 30%, is valve A considered fully open or fully closed?
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In proportional control, if the valve opening is 80% and valve B is open to 30%, is valve A considered fully open or fully closed? If there are two control valves in the same direction, it is often to expand the adjustable range R of the control valve. “\"Valve opening of 80%\" does it mean that the two equivalent valves are open at 80%? Should it still be 80% from the controller output? Two co-acting control valves are used to expand the adjustable range R of the control valve; it is generally desired that the equivalent valve characteristics remain the same as the original ones (both valves are linear, and the equivalent valve is also linear) ； Two valves are equivalent to one; after equivalence, they remain equivalent to one). If the split point is not appropriate, the equivalent valve characteristics will be distorted (this is also true if there is a coverage area at the split point or if there is a dead zone). It’s difficult to answer the original poster’s question because the information provided is incomplete.
Looking at this profile curve, when the output is 80, valve A remains fully open, as it is already at its fully open position at 50. When valve B is open at 30, if the output is 50, valve A is fully open and valve B is fully closed