Can the outlet valve be slightly opened before starting the high-pressure pump?
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Dear Haiyou, could the outlet valve be slightly opened before starting the high-pressure pump? The pressure was increased from 4 kilograms to 60 kilograms. If it can be slightly opened, what is the purpose? Are there any advantages or disadvantages for the equipment, pipelines, and valves?
Sure, multi-stage pumps and high-speed pumps are usually started with the outlet slightly open.
It is recommended to leave it slightly open; if the outlet valve is too tight, the medium will not be able to flow out in time when the pump is started, which will affect the pump’s operation.
Could you talk about the pros and cons? For example, what are the advantages and disadvantages for pipelines, pump bodies, and valves?
Hello, could you be more detailed?
Before starting a high-pressure centrifugal pump, the minimum flow line must be opened; for high-speed centrifugal pumps, it needs to be slightly opened. Furthermore, when transporting volatile materials, it is also necessary to slightly open the outlet to prevent high-temperature vaporization upon pump startup. When the pump operates at low flow rates, it vibrates heavily; valves also find it difficult to open under high pressure. If this situation persists for an extended period, all of the power is converted into heat, and if this heat is not removed in time. The medium may vaporize due to temperature rise.
This post was last edited by 156026692 on 2018-9-1 at 12:00. With a high-pressure pump like yours operating with the outlet valve closed, the liquid flowing inside the pump becomes increasingly hot, especially when transporting saturated liquids (such as boiler water at 104°C) or other substances that are prone to vaporization. A low flow rate can lead to an increase in fluid temperature, thereby causing cavitation. What if, after the pump starts, you try to open the outlet valve and it’s too tight to open easily? Wouldn’t that make the pump more likely to get damaged?
When starting a centrifugal pump, keeping the pump outlet closed or slightly open results in the lowest shaft power; therefore, either state is appropriate
The circulation pipeline of the high-pressure water pump should be equipped with a minimum flow valve, so that the outlet can remain closed when it is activated