Piston Piston Check Valve - ASME | Valvosider Valvosider Piston Check Valve - ASME | Valvosider The Piston Check Valve by Valvosider, compliant with ASME standards, is designed for various pressure classes and sizes. It is available in the following configurations: - Class 150: Sizes range from 2" to 16" (Figure No. 460PC) - Class 300: Sizes range from 2" to 16" (Figure No. 461PC) - Class 600: Sizes range from 2" to 12" (Figure No. 462PC) - Class... View