The Memosonic SVI1000 still produces air flow at 4mA; sometimes, after waiting for about 10 seconds, no air flow is generated
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The Melsunier SVI1000 still produces air flow at 4mA; sometimes there is no airflow after waiting for about 10 seconds, while at other times a slight amount of air flow continues to occur. This slight airflow affects the valve’s flow rate, which in turn causes the flow meter to show a reading. What confuses me the most is that the problem persists even after replacing the locator with one that is identical to the one used in set B. How can this be resolved?
Readjust the locator, and there should be no problem. From what you say, it should be a pressure release valve.
Is it also possible that the wind pressure is too high? Generally, the air source pressure should be 3.5 kilograms, and it shouldn’t exceed that much.
The valve positioner converts a 4–20mA current signal at its input into a pneumatic pressure signal of 0.2–1.0 kg/cm2 at its output. When 4mA is input, the output should be 0.2 kg/cm2; of course, there is also a wind pressure output.
Is that the case? I only know that 4-20mA corresponds to a valve opening degree of 0-100%. If 4MA does have air flow, what is the volume of that air flow? Is this airflow at a level where the spring cannot be compressed?
Should 4mA also result in a slight amount of air output? Is that the case?