How to open and close the 5 valves of this differential pressure gauge
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As shown in the figure below, this is a differential pressure sensor: one end of the valve is connected to the sensor, while the other end has two pressure measurement points located before and after the filter. The question is, if I want to calibrate the sensor, how should I operate these five valves to bring them into a closed state? And what is the sequence of switching them back to their operating state once calibration is complete? I ask this because I remember that for differential pressure level gauges, the three valves have a specific sequence in which they need to be opened and closed; otherwise, the gauge may get damaged.
Valves for balancing pressure are operated at both ends and then closed, so that the pressure acting on the pressure-measuring components is reduced. Damage is unlikely, as the diaphragm is under considerable pressure. The key is to ensure that the pressure tap is not blocked.
5 valves: 2 for shutdown, 1 for balancing, 2 for evacuation. Turn off first, high then low. Opening the balance valve. Emptying now.
In the diagram, blue represents shutdown, red represents balance, and yellow represents emptying, right?
For the 5-valve assembly used in differential pressure transmitters, in this assembly, the red valve is the balance valve, the yellow valves are the high and low pressure valves, and the blue valve is the drain valve. Check whether there is an air supply diagram on the valve assembly To calibrate, first turn off the negative pressure, open the balance valve, then turn off the high pressure, and finally open the drain valve for calibration. When enabled: turn off the waste discharge, turn on high pressure, close the balance valve, and turn on negative pressure.