Is it necessary to install a minimum flow valve on the recirculation pipe at the outlet of the feed water pump?
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As the title suggests, for this project’s feed water pump with a capacity of 10 liters and a pressure of 20 bar, is it necessary to install a recirculation pipe as well as a minimum flow valve? The minimum flow valve might cost around 10,000 yuan, which is quite expensive. Additionally, some projects use self-acting pressure regulators or electric control valves – which one offers better advantages?
It is recommended to use “10 liters, 20 bar”; it is best to use standardized notation, following the unified SI standards. If the process requires it, it’s best not to skimp on money. There are many methods for control, including motor frequency conversion, self-regulating valves, pneumatic and electric systems, air pressure storage, and more – for reference.
Installing a minimum flow return line at the pump outlet is intended to protect the pump, and it is advisable to do so. There’s no need to install some kind of minimum flow valve; it’s sufficient to use a regular valve with a flow-limiting orifice.
Is your idea something like this: it’s a protection pipeline for the pump, which is used only when the load is below 39%?
As for the specific load level below which this applies, the manufacturer will provide the minimum flow rate required for the pump; just ask the pump manufacturer.