Magnetic flap level gauge
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For double-flange magnetic level gauges, is it necessary to close both flanges simultaneously when checking the zero point?
That’s right, and it’s also necessary to vent the air.
If only the flange on the positive pressure side is closed, will opening the drain valve reset it to zero?
After closing the gas-phase and liquid-phase valves, if there is a vent valve at the top of the measurement cylinder, open it; if not, loosen the screws on the upper flange. In the case of a pressure-free container used for measurement, it is not necessary to close the gas-phase valve
For vessels at atmospheric pressure, it is sufficient to close the liquid-phase valve; for vessels under pressure, it is necessary to close the root valves for both the liquid and gas phases. When maintaining instruments, safety must come first!
Close both the upper and lower pressure-taking valves at the same time; either opening the upper pressure-relief valve or the lower drain valve will allow the instrument to return to zero. This will work as long as there are no foreign substances blocking the internal components. Even if only the positive-pressure valve is closed and the drain valve is opened, the instrument will still return to zero, but this approach does not comply with operational procedures and poses a risk. Also, are you sure you’re referring to a level gauge and not a boundary level gauge?
What is a double-flange magnetic flip valve? Is it a double-flange differential pressure level gauge or a side-mounted magnetic flap level gauge?
I still recommend loosening the flange to adjust the zero position
Ah, Mu didn’t work on side-mounted magnetostrictive devices before? The principle is the same, you know.