A small question about rotor flowmeters
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Some small-bore rotameters are equipped with a needle-type shut-off valve at the inlet, which is used primarily for manually adjusting the flow rate; it also helps to prevent impacts on the rotor as the medium flows through the rotameter； However, there are also cases where stop valves are installed at the outlet of the flow meter. Does anyone with experience in this area know whether it is better to install them at the outlet or at the inlet? Thank you.
This post was last edited by mgg5811 on 2010-8-5 at 10:52. It is recommended to install shut-off valves and bypass valves both at the beginning and end: this facilitates disassembly and inspection when impurities in the medium get stuck in the rotor (in the absence of a filter), and it also helps ensure a smooth start-up process. There must be straight pipe sections in front of and behind the shut-off valves and flow meter (at least 5D in front)
Valves should be installed at both the front and back of the rotameter to facilitate maintenance.
For ease of maintenance, valves should be installed both before and after the rotameters; there are many rotameters in our unit’s water treatment workshop, and ordinary stop valves are sufficient.
The poster is referring to glass or plastic rotameters; they are usually installed below the flow meter
Under normal circumstances, it is installed in front of the valve.