Why has the gas delivery valve position increased from 45 liters to 70, yet the flow rate remains stable?
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Why has the valve position for gas delivery changed from 45 liters to 70? The reason for the increased valve position is to control and stabilize the flow rate. But what are the factors that affect the delivery of traffic? Is it condensate carried by the gas? Or some other factor affects the flow detection, which in turn causes the valve position to increase.
This is related to changes in temperature, I guess.
Think about it, where does your gas flow come from? If there is no pressure ahead, how can there be flow? So, the real reason that affects your flow rate is the decrease in pressure at the upstream end. When the pressure there decreases, if the valve opening remains unchanged, the flow rate will inevitably drop. If you want to maintain a stable flow rate, you need to increase the valve opening in order to ensure that enough flow passes through.
Maybe, perhaps, when the flow rate drops to a certain level, the throttling effect caused by the opening degree of the valve will disappear? . . . It’s just like when you go to a movie theater; if there aren’t many people in the lobby, then whether the doors are wide open or slightly closed, it won’t affect your ability to come in and out, right?
Air is delivered by pressure difference, with the pressure difference being at most around 4 kPa
Changes on the gas supply side and those on the gas consumption side both affect the flow rate, which in turn leads to changes in the valve opening degree.
The flow rate of a gas is closely related to its pressure and temperature.
The pressure difference before and after the valve has decreased. A larger pressure difference results in a higher flow rate; for a given channel, the flow rate remains constant ； The pressure difference decreases, the flow velocity slows down; if the channel remains unchanged, the flow rate will decrease. To maintain a constant flow rate, the channel must be enlarged.