Swing Swing Check Valve Pressure Seal - ASME | Valvosider Valvosider Swing Check Valve Pressure Seal - ASME | Valvosider The Swing Check Valve Pressure Seal by Valvosider is designed according to ASME standards and is available in various pressure classes and sizes. It is suitable for applications requiring reliable backflow prevention. The valve comes in pressure classes 600, 900, 1500, and 2500, with sizes ranging from 2 inches to 24 inches for classes 600 to 1500, and 2... View