Butterfly valve (lattice disc)
<img src="https://eng-calculations.com/SVG/Hydraulic_engineering/Valves/Butterfly valve (lattice disc).svg" alt="Butterfly_valve_(lattice_disc)" title="Butterfly_valve_(lattice_disc)">
https://eng-calculations.com/SVG/Hydraulic_engineering/Valves/Butterfly valve (lattice disc).svg