How should we understand the fact that backpressure valves are widely used in low-pressure dosing systems?
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1. I read some information online about backpressure valves; they are used quite frequently in low-pressure dosing systems. How should this statement be understood? . Does this low pressure refer to the low head pressure of the metering pump? So why not choose a higher head? 2. If the head pressure of the metering pump is 30 meters, then can the back pressure setting of the back pressure valve be anything less than 30 meters? Otherwise, how can the spring open? If the back pressure is set at 40 meters, it’s impossible to generate a pressure of 40 meters under that condition. Thank you for your attention
1. The back pressure valve is indeed used at the outlet of metering pumps with lower flow rates. As for why a pump with higher head isn’t chosen, it’s because the lower head is sufficient to meet the requirements, so there’s no need to waste resources； The main function of the back pressure valve is to overcome the pressure at the inlet of the metering pump and prevent it from flowing on its own; therefore, it is generally correct for the back pressure to be lower than the head of the metering pump