https://www.siemens.com/en-gb/products/sitrans/f-va-250/
SITRANS F VA250 - Variable Area Flowmeter | Siemens
SITRANS F VA250 variable area flowmeters provide robust, precise liquid and gas measurement for chemical, pharma and industrial use, with easy reading
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https://kr.mathworks.com/help/hydro/ref/spoolorificeil.html
Spool Orifice (IL) - Variable-area spool orifice in an isothermal liquid system - MATLAB
The Spool Orifice (IL) block models a variable-area orifice between a spool and a sleeve with holes.
variable areaspoolorificeil
https://acemeter.en.made-in-china.com/product-group/boenBzGJOUYM/Variable-Area-Rota-Flow-Meter-1.html
Variable Area Rota Flow Meter - ACE METER TECHNOLOGY CO., LIMITED - page 1.
China Variable Area Rota Flow Meter catalog of Variable Area Flow Meter Rotameter Metal Tube Float Flowmeter for Liquid and Gas, Good Price Mechanical Variable...
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https://sg.rs-online.com/web/p/flow-sensors/1982903
MR3A13BVBN | Key Instruments MR3000 Series Variable Area Flow Meter for Gas, 0.1L/min Min, 1.2L/min...
Buy Key Instruments MR3000 Series Variable Area Flow Meter for Gas, 0.1L/min Min, 1.2L/min Max MR3A13BVBN or other Flow Sensors online from RS for next day...
https://ch.mathworks.com/help/hydro/ref/orificetl.html
Orifice (TL) - Constant-area or variable-area orifice in a thermal liquid system - MATLAB
The Orifice (TL) block models the flow through a local restriction with a constant or variable opening area.