Bellow Sealed Valves are a new breed of Industrial process valves, designed to eliminate Valve leakage and are also known as ‘Zero Leak Valves’ or ‘Emission Free Valves.’ In these Valves, conventional gland packing is appended/supplemented by a metallic Bellow Cartridge joined to the valve bonnet at one end, and the stem at the other end. A bellow is a long accordion-like tube. As the valve stem strokes, the bellow expands or compresses with the stroke movement. There are no sliding or rotating seals through which process fluid can pass. The fluid will enter the valve from the seat of the valve & come in contact with the bellow, but will not come in contact with the stem.