500 x 750 mm pin valve (Polygon mesh 3D model) is available on CGTrader for $30. Original author: rasari35-0cf8ce. Specs: 10 polys, 10 verts.
3MF (3D Manufacturing File, filesize: 251 KB), SLDPRT (SolidWorks, filesize: 302 KB), OTHER (Other, filesize: 1.05 MB), IGE (IGES, filesize: 2.8 MB), X_T (Parasolid, filesize: 234 KB)