Is it necessary to install an exhaust drain at the outlet of a centrifugal pump?
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Is it necessary to design an exhaust valve at the outlet of a centrifugal pump? Under what circumstances can an exhaust valve be omitted? If the outlet pipeline runs straight upward, can we do without an exhaust valve?
It is not always necessary to install an exhaust drain at the outlet of a centrifugal pump, but in some cases, having such a drain makes it easier to remove gases and water from the pipeline, thus ensuring the proper operation of the piping system. An exhaust valve is not necessarily required to be designed at the outlet of a centrifugal pump. If the outlet pipe runs straight upward, it may be possible to omit the exhaust valve. But in other cases, such as when the pipe design includes sharp changes in height or the pipe route has bends, exhaust valves need to be installed to remove gas and water from the pipe. Therefore, whether it is necessary to install a vent valve depends on the specific design of the piping system. .
In general, an exhaust port should be added to ensure that the interior of the pump is filled with liquid, which facilitates pump startup and prevents idling that could damage the pump. It is also necessary to drain all residual liquid; when the pump is not in use, the liquid in the pipelines and within the pump itself must be drained to prevent the pump casing from cracking due to freezing or corrosion of the pump body.
Firstly, the function of the pump outlet exhaust valve is to meet the operating conditions before the centrifugal pump starts up. If you can meet its startup conditions in other ways, it can be canceled. It is best to first understand the working principle of the device within its respective process, so as to use it more effectively. For reference.
Are there any standards or design documents to support this?