I’m a beginner; may I ask about adjusting the valve opening?
Thread Content
I’m a beginner. When starting up, can the control valve be adjusted to 50% right away, or should it be increased gradually from 0% to 50%? In practice, how is automatic control operated?
It cannot go directly to 50%; it must reach 50% within the operating range of the control valve.
This issue needs to be determined based on the process requirements of the specific procedure. The usual approach is to implement manual control, and then switch to automatic control once normal operation is restored. But it is also possible to set the parameters in advance and switch to automatic mode; the parameters can be automatically adjusted according to changes in the manufacturing process. Often, there are significant changes in operating conditions during the equipment startup process, and to avoid accidents, manual operation is carried out first before switching to automatic mode. The specific opening setting should be determined based on process requirements or empirical data, but it is ultimately intended as a reference, with ensuring controlled operation as the priority.
This post was last edited by HEJIYUER on 2020-6-29 at 22:50. It’s like when a child learns to walk – an adult holds their hand and walks slowly, guiding them. Once you’re familiar with it, let go and switch to automatic mode. This is the norm; of course, there are also children who start by throwing automatically. The driving position can also be 100%, and once the process is normal, all valves are closed. Such as a relief valve.
Automatic control is generally determined based on the signal position collected by the valve. It usually ranges from 0 to 50, with gradual opening, which facilitates the monitoring and control of the outlet pressure and flow rate.
It is necessary to determine whether it is possible based on the process conditions
I can only say this: under normal operating conditions, it must never be adjusted in this way.