For a DN20 control valve, the flow rate required when the opening is 1% is sufficient; I’m not sure what the problem is
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DN20 control valve, designed flow rate 7 m3/h
Is the pressure difference before and after the valve during actual operation much higher than the designed pressure difference?
The switch is fine; there is no flow when it is fully closed, and at a setting of 1%, the actual opening degree of the valve is very small. Fully in line with reality
At 1% opening, it can’t be seen on site, right? It’s clear that it’s not 1%.
It might be for this reason; the selection parameters
It is likely that the design parameters selected do not match the actual operating conditions.
If the selection is incorrect or the actuator does not function accurately, a 1% difference is basically undetectable
There are no issues with the selection or the positioner. It’s just a bit too large; according to the calculations done by our professionals, this valve needs to be opened by at least 30% to be reasonable. There is another common phenomenon – I’m not sure if it’s true – namely that many ammonia control valves cannot be adjusted and must be controlled by the height of the manual valve. . .
Agree with the person above; 1% is less than one degree – can’t it be seen with the naked eye? . .