How to select a low-flow control valve
Thread Content
Dear experts: Our company is planning to upgrade its automatic alkali dosing system, and we need to select pneumatic control valves with a low flow rate – the flow rate should be between 200 kg and 87 kg/h. The medium is alkaline; how should we choose the appropriate valve? Should it be a percentage curve or a straight line? Is it a single-seat valve, a double-seat valve, or a corner valve? Please advise
With such a small amount, it is recommended to use a metering pump for dosing.
Choose Badger Meter; it’s designed specifically for low-flow applications.
Metering pumps with very low flow rates – miniature metering pumps
BDG, Fox, and Fisher all have low-flow control valves. Our unit has just purchased an oxygen control valve with a flow rate of 2 g/h; it is of the equal hundred and single-seat type – for reference only
Should we talk about angle valves first or straight-through ones? You need to determine this based on your piping ； But for what I’ve made, the small-caliber ones seem to all be corner-type; single-seat or double-seat? For small diameters, a single seat might be better ； Regarding flow characteristics, it is necessary to calculate based on detailed parameters to determine what size valve to use; equal percentage control should be preferred whenever possible. If the valve diameter is as small as DN5, linear control may be the only option available. We have manufactured small control valves for neon/helium extraction, krypton/xenon extraction, as well as for liquid hydrogen applications