Cone type flanged strainers are available in stainless steel or carbon steel. Cone has raised inner lip design which prevents it from blowing out and down pipeline. All carbon steel cone strainers and orifice plates are identified with blue flange.
Coned Compression Springs are specified where the large end is supposed to work in a bore and the small end works over a rod. The advantage is the reduced solid height. Each spring features a variable pitch to achieve the constant spring rate and coils, which nest during deflection to provide a solid height approximately equal to two wire diameters.